/*
- * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2020 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
- *
+ *
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* unlawful or unlicensed copies of an Apple operating system, or to
* circumvent, violate, or enable the circumvention or violation of, any
* terms of an Apple operating system software license agreement.
- *
+ *
* Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this file.
- *
+ *
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
- *
+ *
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
/*
* @OSF_COPYRIGHT@
*/
-/*
+/*
* Mach Operating System
* Copyright (c) 1991,1990,1989,1988,1987 Carnegie Mellon University
* All Rights Reserved.
- *
+ *
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
- *
+ *
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
+ *
* Carnegie Mellon requests users of this software to return to
- *
+ *
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
- *
+ *
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
#include <mach_cluster_stats.h>
#include <mach_pagemap.h>
-#include <mach_kdb.h>
#include <libkern/OSAtomic.h>
#include <mach/mach_types.h>
#include <mach/kern_return.h>
-#include <mach/message.h> /* for error codes */
+#include <mach/message.h> /* for error codes */
#include <mach/vm_param.h>
#include <mach/vm_behavior.h>
#include <mach/memory_object.h>
- /* For memory_object_data_{request,unlock} */
+/* For memory_object_data_{request,unlock} */
#include <mach/sdt.h>
#include <kern/kern_types.h>
#include <kern/thread.h>
#include <kern/sched_prim.h>
#include <kern/host.h>
-#include <kern/xpr.h>
#include <kern/mach_param.h>
#include <kern/macro_help.h>
#include <kern/zalloc.h>
#include <kern/misc_protos.h>
+#include <kern/policy_internal.h>
+#include <vm/vm_compressor.h>
+#include <vm/vm_compressor_pager.h>
#include <vm/vm_fault.h>
#include <vm/vm_map.h>
#include <vm/vm_object.h>
#include <vm/vm_protos.h>
#include <vm/vm_external.h>
#include <vm/memory_object.h>
-#include <vm/vm_purgeable_internal.h> /* Needed by some vm_page.h macros */
+#include <vm/vm_purgeable_internal.h> /* Needed by some vm_page.h macros */
#include <vm/vm_shared_region.h>
-#define VM_FAULT_CLASSIFY 0
+#include <sys/codesign.h>
+#include <sys/reason.h>
+#include <sys/signalvar.h>
+
+#include <san/kasan.h>
+
+#define VM_FAULT_CLASSIFY 0
#define TRACEFAULTPAGE 0 /* (TEST/DEBUG) */
-int vm_object_pagein_throttle = 16;
+int vm_protect_privileged_from_untrusted = 1;
+
+unsigned int vm_object_pagein_throttle = 16;
/*
- * We apply a hard throttle to the demand zero rate of tasks that we believe are running out of control which
+ * We apply a hard throttle to the demand zero rate of tasks that we believe are running out of control which
* kicks in when swap space runs out. 64-bit programs have massive address spaces and can leak enormous amounts
* of memory if they're buggy and can run the system completely out of swap space. If this happens, we
* impose a hard throttle on them to prevent them from taking the last bit of memory left. This helps
- * keep the UI active so that the user has a chance to kill the offending task before the system
+ * keep the UI active so that the user has a chance to kill the offending task before the system
* completely hangs.
*
* The hard throttle is only applied when the system is nearly completely out of swap space and is only applied
* delay of HARD_THROTTLE_DELAY microseconds before being allowed to try the page fault again.
*/
-boolean_t thread_is_io_throttled(void);
+extern void throttle_lowpri_io(int);
-uint64_t vm_hard_throttle_threshold;
+extern struct vnode *vnode_pager_lookup_vnode(memory_object_t);
-extern unsigned int dp_pages_free, dp_pages_reserve;
+uint64_t vm_hard_throttle_threshold;
-#define NEED_TO_HARD_THROTTLE_THIS_TASK() (((dp_pages_free + dp_pages_reserve < 2000) && \
- (get_task_resident_size(current_task()) > vm_hard_throttle_threshold) && \
- (current_task() != kernel_task) && VM_DYNAMIC_PAGING_ENABLED(memory_manager_default)) || \
- (vm_page_free_count < vm_page_throttle_limit && thread_is_io_throttled() && \
- (get_task_resident_size(current_task()) > vm_hard_throttle_threshold)))
+OS_ALWAYS_INLINE
+boolean_t
+NEED_TO_HARD_THROTTLE_THIS_TASK(void)
+{
+ return vm_wants_task_throttled(current_task()) ||
+ ((vm_page_free_count < vm_page_throttle_limit ||
+ HARD_THROTTLE_LIMIT_REACHED()) &&
+ proc_get_effective_thread_policy(current_thread(), TASK_POLICY_IO) >= THROTTLE_LEVEL_THROTTLED);
+}
-#define HARD_THROTTLE_DELAY 20000 /* 20000 us == 20 ms */
-#define SOFT_THROTTLE_DELAY 2000 /* 2000 us == 2 ms */
+#define HARD_THROTTLE_DELAY 10000 /* 10000 us == 10 ms */
+#define SOFT_THROTTLE_DELAY 200 /* 200 us == .2 ms */
+#define VM_PAGE_CREATION_THROTTLE_PERIOD_SECS 6
+#define VM_PAGE_CREATION_THROTTLE_RATE_PER_SEC 20000
-extern int cs_debug;
-#if MACH_KDB
-extern struct db_watchpoint *db_watchpoint_list;
-#endif /* MACH_KDB */
+#define VM_STAT_DECOMPRESSIONS() \
+MACRO_BEGIN \
+ VM_STAT_INCR(decompressions); \
+ current_thread()->decompressions++; \
+MACRO_END
boolean_t current_thread_aborted(void);
/* Forward declarations of internal routines. */
-extern kern_return_t vm_fault_wire_fast(
- vm_map_t map,
- vm_map_offset_t va,
- vm_map_entry_t entry,
- pmap_t pmap,
- vm_map_offset_t pmap_addr);
-
-extern void vm_fault_continue(void);
-
-extern void vm_fault_copy_cleanup(
- vm_page_t page,
- vm_page_t top_page);
-
-extern void vm_fault_copy_dst_cleanup(
- vm_page_t page);
-
-#if VM_FAULT_CLASSIFY
-extern void vm_fault_classify(vm_object_t object,
- vm_object_offset_t offset,
- vm_prot_t fault_type);
+static kern_return_t vm_fault_wire_fast(
+ vm_map_t map,
+ vm_map_offset_t va,
+ vm_prot_t prot,
+ vm_tag_t wire_tag,
+ vm_map_entry_t entry,
+ pmap_t pmap,
+ vm_map_offset_t pmap_addr,
+ ppnum_t *physpage_p);
+
+static kern_return_t vm_fault_internal(
+ vm_map_t map,
+ vm_map_offset_t vaddr,
+ vm_prot_t caller_prot,
+ boolean_t change_wiring,
+ vm_tag_t wire_tag,
+ int interruptible,
+ pmap_t pmap,
+ vm_map_offset_t pmap_addr,
+ ppnum_t *physpage_p);
+
+static void vm_fault_copy_cleanup(
+ vm_page_t page,
+ vm_page_t top_page);
+
+static void vm_fault_copy_dst_cleanup(
+ vm_page_t page);
+
+#if VM_FAULT_CLASSIFY
+extern void vm_fault_classify(vm_object_t object,
+ vm_object_offset_t offset,
+ vm_prot_t fault_type);
extern void vm_fault_classify_init(void);
#endif
unsigned long vm_pmap_enter_blocked = 0;
+unsigned long vm_pmap_enter_retried = 0;
unsigned long vm_cs_validates = 0;
unsigned long vm_cs_revalidates = 0;
unsigned long vm_cs_query_modified = 0;
unsigned long vm_cs_validated_dirtied = 0;
unsigned long vm_cs_bitmap_validated = 0;
-#if CONFIG_ENFORCE_SIGNED_CODE
-int cs_enforcement_disable=0;
-#else
-static const int cs_enforcement_disable=1;
-#endif
+
+void vm_pre_fault(vm_map_offset_t, vm_prot_t);
+
+extern char *kdp_compressor_decompressed_page;
+extern addr64_t kdp_compressor_decompressed_page_paddr;
+extern ppnum_t kdp_compressor_decompressed_page_ppnum;
+
+struct vmrtfr {
+ int vmrtfr_maxi;
+ int vmrtfr_curi;
+ int64_t vmrtf_total;
+ vm_rtfault_record_t *vm_rtf_records;
+} vmrtfrs;
+#define VMRTF_DEFAULT_BUFSIZE (4096)
+#define VMRTF_NUM_RECORDS_DEFAULT (VMRTF_DEFAULT_BUFSIZE / sizeof(vm_rtfault_record_t))
+TUNABLE(int, vmrtf_num_records, "vm_rtfault_records", VMRTF_NUM_RECORDS_DEFAULT);
+
+static void vm_rtfrecord_lock(void);
+static void vm_rtfrecord_unlock(void);
+static void vm_record_rtfault(thread_t, uint64_t, vm_map_offset_t, int);
+
+extern lck_grp_t vm_page_lck_grp_bucket;
+extern lck_attr_t vm_page_lck_attr;
+LCK_SPIN_DECLARE_ATTR(vm_rtfr_slock, &vm_page_lck_grp_bucket, &vm_page_lck_attr);
/*
* Routine: vm_fault_init
* Purpose:
* Initialize our private data structures.
*/
+__startup_func
void
vm_fault_init(void)
{
-#if !SECURE_KERNEL
-#if CONFIG_ENFORCE_SIGNED_CODE
- PE_parse_boot_argn("cs_enforcement_disable", &cs_enforcement_disable,
- sizeof (cs_enforcement_disable));
-#endif
- PE_parse_boot_argn("cs_debug", &cs_debug, sizeof (cs_debug));
-#endif
-
+ int i, vm_compressor_temp;
+ boolean_t need_default_val = TRUE;
/*
* Choose a value for the hard throttle threshold based on the amount of ram. The threshold is
* computed as a percentage of available memory, and the percentage used is scaled inversely with
- * the amount of memory. The pertange runs between 10% and 35%. We use 35% for small memory systems
+ * the amount of memory. The percentage runs between 10% and 35%. We use 35% for small memory systems
* and reduce the value down to 10% for very large memory configurations. This helps give us a
* definition of a memory hog that makes more sense relative to the amount of ram in the machine.
* The formula here simply uses the number of gigabytes of ram to adjust the percentage.
*/
- vm_hard_throttle_threshold = sane_size * (35 - MIN((int)(sane_size / (1024*1024*1024)), 25)) / 100;
+ vm_hard_throttle_threshold = sane_size * (35 - MIN((int)(sane_size / (1024 * 1024 * 1024)), 25)) / 100;
+
+ /*
+ * Configure compressed pager behavior. A boot arg takes precedence over a device tree entry.
+ */
+
+ if (PE_parse_boot_argn("vm_compressor", &vm_compressor_temp, sizeof(vm_compressor_temp))) {
+ for (i = 0; i < VM_PAGER_MAX_MODES; i++) {
+ if (((vm_compressor_temp & (1 << i)) == vm_compressor_temp)) {
+ need_default_val = FALSE;
+ vm_compressor_mode = vm_compressor_temp;
+ break;
+ }
+ }
+ if (need_default_val) {
+ printf("Ignoring \"vm_compressor\" boot arg %d\n", vm_compressor_temp);
+ }
+ }
+ if (need_default_val) {
+ /* If no boot arg or incorrect boot arg, try device tree. */
+ PE_get_default("kern.vm_compressor", &vm_compressor_mode, sizeof(vm_compressor_mode));
+ }
+ printf("\"vm_compressor_mode\" is %d\n", vm_compressor_mode);
+
+ PE_parse_boot_argn("vm_protect_privileged_from_untrusted",
+ &vm_protect_privileged_from_untrusted,
+ sizeof(vm_protect_privileged_from_untrusted));
+}
+
+__startup_func
+static void
+vm_rtfault_record_init(void)
+{
+ size_t size;
+
+ vmrtf_num_records = MAX(vmrtf_num_records, 1);
+ size = vmrtf_num_records * sizeof(vm_rtfault_record_t);
+ vmrtfrs.vm_rtf_records = zalloc_permanent(size,
+ ZALIGN(vm_rtfault_record_t));
+ vmrtfrs.vmrtfr_maxi = vmrtf_num_records - 1;
}
+STARTUP(ZALLOC, STARTUP_RANK_MIDDLE, vm_rtfault_record_init);
/*
* Routine: vm_fault_cleanup
*/
void
vm_fault_cleanup(
- register vm_object_t object,
- register vm_page_t top_page)
+ vm_object_t object,
+ vm_page_t top_page)
{
vm_object_paging_end(object);
vm_object_unlock(object);
if (top_page != VM_PAGE_NULL) {
- object = top_page->object;
+ object = VM_PAGE_OBJECT(top_page);
vm_object_lock(object);
VM_PAGE_FREE(top_page);
}
}
-#if MACH_CLUSTER_STATS
-#define MAXCLUSTERPAGES 16
-struct {
- unsigned long pages_in_cluster;
- unsigned long pages_at_higher_offsets;
- unsigned long pages_at_lower_offsets;
-} cluster_stats_in[MAXCLUSTERPAGES];
-#define CLUSTER_STAT(clause) clause
-#define CLUSTER_STAT_HIGHER(x) \
- ((cluster_stats_in[(x)].pages_at_higher_offsets)++)
-#define CLUSTER_STAT_LOWER(x) \
- ((cluster_stats_in[(x)].pages_at_lower_offsets)++)
-#define CLUSTER_STAT_CLUSTER(x) \
- ((cluster_stats_in[(x)].pages_in_cluster)++)
-#else /* MACH_CLUSTER_STATS */
-#define CLUSTER_STAT(clause)
-#endif /* MACH_CLUSTER_STATS */
-
#define ALIGNED(x) (((x) & (PAGE_SIZE_64 - 1)) == 0)
-boolean_t vm_page_deactivate_behind = TRUE;
-/*
- * default sizes given VM_BEHAVIOR_DEFAULT reference behavior
+boolean_t vm_page_deactivate_behind = TRUE;
+/*
+ * default sizes given VM_BEHAVIOR_DEFAULT reference behavior
*/
-#define VM_DEFAULT_DEACTIVATE_BEHIND_WINDOW 128
-#define VM_DEFAULT_DEACTIVATE_BEHIND_CLUSTER 16 /* don't make this too big... */
+#define VM_DEFAULT_DEACTIVATE_BEHIND_WINDOW 128
+#define VM_DEFAULT_DEACTIVATE_BEHIND_CLUSTER 16 /* don't make this too big... */
/* we use it to size an array on the stack */
int vm_default_behind = VM_DEFAULT_DEACTIVATE_BEHIND_WINDOW;
-#define MAX_SEQUENTIAL_RUN (1024 * 1024 * 1024)
+#define MAX_SEQUENTIAL_RUN (1024 * 1024 * 1024)
/*
* vm_page_is_sequential
static
void
vm_fault_is_sequential(
- vm_object_t object,
- vm_object_offset_t offset,
- vm_behavior_t behavior)
+ vm_object_t object,
+ vm_object_offset_t offset,
+ vm_behavior_t behavior)
{
- vm_object_offset_t last_alloc;
- int sequential;
- int orig_sequential;
+ vm_object_offset_t last_alloc;
+ int sequential;
+ int orig_sequential;
- last_alloc = object->last_alloc;
+ last_alloc = object->last_alloc;
sequential = object->sequential;
orig_sequential = sequential;
+ offset = vm_object_trunc_page(offset);
+ if (offset == last_alloc && behavior != VM_BEHAVIOR_RANDOM) {
+ /* re-faulting in the same page: no change in behavior */
+ return;
+ }
+
switch (behavior) {
case VM_BEHAVIOR_RANDOM:
- /*
+ /*
* reset indicator of sequential behavior
*/
- sequential = 0;
- break;
+ sequential = 0;
+ break;
case VM_BEHAVIOR_SEQUENTIAL:
- if (offset && last_alloc == offset - PAGE_SIZE_64) {
- /*
+ if (offset && last_alloc == offset - PAGE_SIZE_64) {
+ /*
* advance indicator of sequential behavior
*/
- if (sequential < MAX_SEQUENTIAL_RUN)
- sequential += PAGE_SIZE;
+ if (sequential < MAX_SEQUENTIAL_RUN) {
+ sequential += PAGE_SIZE;
+ }
} else {
- /*
+ /*
* reset indicator of sequential behavior
*/
- sequential = 0;
+ sequential = 0;
}
- break;
+ break;
case VM_BEHAVIOR_RSEQNTL:
- if (last_alloc && last_alloc == offset + PAGE_SIZE_64) {
- /*
+ if (last_alloc && last_alloc == offset + PAGE_SIZE_64) {
+ /*
* advance indicator of sequential behavior
*/
- if (sequential > -MAX_SEQUENTIAL_RUN)
- sequential -= PAGE_SIZE;
+ if (sequential > -MAX_SEQUENTIAL_RUN) {
+ sequential -= PAGE_SIZE;
+ }
} else {
- /*
+ /*
* reset indicator of sequential behavior
*/
- sequential = 0;
+ sequential = 0;
}
- break;
+ break;
case VM_BEHAVIOR_DEFAULT:
default:
- if (offset && last_alloc == (offset - PAGE_SIZE_64)) {
- /*
+ if (offset && last_alloc == (offset - PAGE_SIZE_64)) {
+ /*
* advance indicator of sequential behavior
*/
- if (sequential < 0)
- sequential = 0;
- if (sequential < MAX_SEQUENTIAL_RUN)
- sequential += PAGE_SIZE;
-
+ if (sequential < 0) {
+ sequential = 0;
+ }
+ if (sequential < MAX_SEQUENTIAL_RUN) {
+ sequential += PAGE_SIZE;
+ }
} else if (last_alloc && last_alloc == (offset + PAGE_SIZE_64)) {
- /*
+ /*
* advance indicator of sequential behavior
*/
- if (sequential > 0)
- sequential = 0;
- if (sequential > -MAX_SEQUENTIAL_RUN)
- sequential -= PAGE_SIZE;
+ if (sequential > 0) {
+ sequential = 0;
+ }
+ if (sequential > -MAX_SEQUENTIAL_RUN) {
+ sequential -= PAGE_SIZE;
+ }
} else {
- /*
+ /*
* reset indicator of sequential behavior
*/
- sequential = 0;
+ sequential = 0;
}
- break;
+ break;
}
if (sequential != orig_sequential) {
- if (!OSCompareAndSwap(orig_sequential, sequential, (UInt32 *)&object->sequential)) {
- /*
+ if (!OSCompareAndSwap(orig_sequential, sequential, (UInt32 *)&object->sequential)) {
+ /*
* if someone else has already updated object->sequential
* don't bother trying to update it or object->last_alloc
*/
- return;
+ return;
}
}
/*
static
boolean_t
vm_fault_deactivate_behind(
- vm_object_t object,
- vm_object_offset_t offset,
- vm_behavior_t behavior)
+ vm_object_t object,
+ vm_object_offset_t offset,
+ vm_behavior_t behavior)
{
- int n;
- int pages_in_run = 0;
- int max_pages_in_run = 0;
- int sequential_run;
- int sequential_behavior = VM_BEHAVIOR_SEQUENTIAL;
- vm_object_offset_t run_offset = 0;
- vm_object_offset_t pg_offset = 0;
- vm_page_t m;
- vm_page_t page_run[VM_DEFAULT_DEACTIVATE_BEHIND_CLUSTER];
+ int n;
+ int pages_in_run = 0;
+ int max_pages_in_run = 0;
+ int sequential_run;
+ int sequential_behavior = VM_BEHAVIOR_SEQUENTIAL;
+ vm_object_offset_t run_offset = 0;
+ vm_object_offset_t pg_offset = 0;
+ vm_page_t m;
+ vm_page_t page_run[VM_DEFAULT_DEACTIVATE_BEHIND_CLUSTER];
pages_in_run = 0;
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0018, (unsigned int) object, (unsigned int) vm_fault_deactivate_behind); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0018, (unsigned int) object, (unsigned int) vm_fault_deactivate_behind); /* (TEST/DEBUG) */
#endif
-
- if (object == kernel_object || vm_page_deactivate_behind == FALSE) {
+ if (object == kernel_object || vm_page_deactivate_behind == FALSE || (vm_object_trunc_page(offset) != offset)) {
/*
* Do not deactivate pages from the kernel object: they
* are not intended to become pageable.
* or we've disabled the deactivate behind mechanism
+ * or we are dealing with an offset that is not aligned to
+ * the system's PAGE_SIZE because in that case we will
+ * handle the deactivation on the aligned offset and, thus,
+ * the full PAGE_SIZE page once. This helps us avoid the redundant
+ * deactivates and the extra faults.
*/
return FALSE;
}
if ((sequential_run = object->sequential)) {
- if (sequential_run < 0) {
- sequential_behavior = VM_BEHAVIOR_RSEQNTL;
- sequential_run = 0 - sequential_run;
- } else {
- sequential_behavior = VM_BEHAVIOR_SEQUENTIAL;
- }
+ if (sequential_run < 0) {
+ sequential_behavior = VM_BEHAVIOR_RSEQNTL;
+ sequential_run = 0 - sequential_run;
+ } else {
+ sequential_behavior = VM_BEHAVIOR_SEQUENTIAL;
+ }
}
switch (behavior) {
case VM_BEHAVIOR_RANDOM:
break;
case VM_BEHAVIOR_SEQUENTIAL:
- if (sequential_run >= (int)PAGE_SIZE) {
+ if (sequential_run >= (int)PAGE_SIZE) {
run_offset = 0 - PAGE_SIZE_64;
max_pages_in_run = 1;
}
break;
case VM_BEHAVIOR_RSEQNTL:
- if (sequential_run >= (int)PAGE_SIZE) {
+ if (sequential_run >= (int)PAGE_SIZE) {
run_offset = PAGE_SIZE_64;
max_pages_in_run = 1;
}
break;
case VM_BEHAVIOR_DEFAULT:
default:
- { vm_object_offset_t behind = vm_default_behind * PAGE_SIZE_64;
+ { vm_object_offset_t behind = vm_default_behind * PAGE_SIZE_64;
- /*
+ /*
* determine if the run of sequential accesss has been
* long enough on an object with default access behavior
* to consider it for deactivation
* in this kind of odd fashion in order to prevent wrap around
* at the end points
*/
- if (sequential_behavior == VM_BEHAVIOR_SEQUENTIAL) {
- if (offset >= behind) {
+ if (sequential_behavior == VM_BEHAVIOR_SEQUENTIAL) {
+ if (offset >= behind) {
run_offset = 0 - behind;
pg_offset = PAGE_SIZE_64;
max_pages_in_run = VM_DEFAULT_DEACTIVATE_BEHIND_CLUSTER;
}
} else {
- if (offset < -behind) {
+ if (offset < -behind) {
run_offset = behind;
pg_offset = 0 - PAGE_SIZE_64;
max_pages_in_run = VM_DEFAULT_DEACTIVATE_BEHIND_CLUSTER;
}
}
}
- break;
+ break;}
}
- }
- for (n = 0; n < max_pages_in_run; n++) {
+ for (n = 0; n < max_pages_in_run; n++) {
m = vm_page_lookup(object, offset + run_offset + (n * pg_offset));
- if (m && !m->busy && !m->no_cache && !m->throttled && !m->fictitious && !m->absent) {
+ if (m && !m->vmp_laundry && !m->vmp_busy && !m->vmp_no_cache && (m->vmp_q_state != VM_PAGE_ON_THROTTLED_Q) && !m->vmp_fictitious && !m->vmp_absent) {
page_run[pages_in_run++] = m;
- pmap_clear_reference(m->phys_page);
+
+ /*
+ * by not passing in a pmap_flush_context we will forgo any TLB flushing, local or otherwise...
+ *
+ * a TLB flush isn't really needed here since at worst we'll miss the reference bit being
+ * updated in the PTE if a remote processor still has this mapping cached in its TLB when the
+ * new reference happens. If no futher references happen on the page after that remote TLB flushes
+ * we'll see a clean, non-referenced page when it eventually gets pulled out of the inactive queue
+ * by pageout_scan, which is just fine since the last reference would have happened quite far
+ * in the past (TLB caches don't hang around for very long), and of course could just as easily
+ * have happened before we did the deactivate_behind.
+ */
+ pmap_clear_refmod_options(VM_PAGE_GET_PHYS_PAGE(m), VM_MEM_REFERENCED, PMAP_OPTIONS_NOFLUSH, (void *)NULL);
}
}
if (pages_in_run) {
vm_page_lockspin_queues();
for (n = 0; n < pages_in_run; n++) {
-
m = page_run[n];
vm_page_deactivate_internal(m, FALSE);
vm_page_deactivate_behind_count++;
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0019, (unsigned int) object, (unsigned int) m); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0019, (unsigned int) object, (unsigned int) m); /* (TEST/DEBUG) */
#endif
}
vm_page_unlock_queues();
}
+#if (DEVELOPMENT || DEBUG)
+uint32_t vm_page_creation_throttled_hard = 0;
+uint32_t vm_page_creation_throttled_soft = 0;
+uint64_t vm_page_creation_throttle_avoided = 0;
+#endif /* DEVELOPMENT || DEBUG */
+
static int
-vm_page_throttled(void)
+vm_page_throttled(boolean_t page_kept)
{
- clock_sec_t elapsed_sec;
- clock_sec_t tv_sec;
- clock_usec_t tv_usec;
-
+ clock_sec_t elapsed_sec;
+ clock_sec_t tv_sec;
+ clock_usec_t tv_usec;
+
thread_t thread = current_thread();
-
- if (thread->options & TH_OPT_VMPRIV)
- return (0);
- thread->t_page_creation_count++;
+ if (thread->options & TH_OPT_VMPRIV) {
+ return 0;
+ }
- if (NEED_TO_HARD_THROTTLE_THIS_TASK())
- return (HARD_THROTTLE_DELAY);
+ if (thread->t_page_creation_throttled) {
+ thread->t_page_creation_throttled = 0;
- if (vm_page_free_count < vm_page_throttle_limit &&
- thread->t_page_creation_count > vm_page_creation_throttle) {
+ if (page_kept == FALSE) {
+ goto no_throttle;
+ }
+ }
+ if (NEED_TO_HARD_THROTTLE_THIS_TASK()) {
+#if (DEVELOPMENT || DEBUG)
+ thread->t_page_creation_throttled_hard++;
+ OSAddAtomic(1, &vm_page_creation_throttled_hard);
+#endif /* DEVELOPMENT || DEBUG */
+ return HARD_THROTTLE_DELAY;
+ }
+ if ((vm_page_free_count < vm_page_throttle_limit || (VM_CONFIG_COMPRESSOR_IS_PRESENT && SWAPPER_NEEDS_TO_UNTHROTTLE())) &&
+ thread->t_page_creation_count > (VM_PAGE_CREATION_THROTTLE_PERIOD_SECS * VM_PAGE_CREATION_THROTTLE_RATE_PER_SEC)) {
+ if (vm_page_free_wanted == 0 && vm_page_free_wanted_privileged == 0) {
+#if (DEVELOPMENT || DEBUG)
+ OSAddAtomic64(1, &vm_page_creation_throttle_avoided);
+#endif
+ goto no_throttle;
+ }
clock_get_system_microtime(&tv_sec, &tv_usec);
elapsed_sec = tv_sec - thread->t_page_creation_time;
- if (elapsed_sec <= 6 || (thread->t_page_creation_count / elapsed_sec) >= (vm_page_creation_throttle / 6)) {
-
- if (elapsed_sec >= 60) {
+ if (elapsed_sec <= VM_PAGE_CREATION_THROTTLE_PERIOD_SECS ||
+ (thread->t_page_creation_count / elapsed_sec) >= VM_PAGE_CREATION_THROTTLE_RATE_PER_SEC) {
+ if (elapsed_sec >= (3 * VM_PAGE_CREATION_THROTTLE_PERIOD_SECS)) {
/*
* we'll reset our stats to give a well behaved app
* that was unlucky enough to accumulate a bunch of pages
* over a long period of time a chance to get out of
* the throttled state... we reset the counter and timestamp
* so that if it stays under the rate limit for the next second
- * it will be back in our good graces... if it exceeds it, it
+ * it will be back in our good graces... if it exceeds it, it
* will remain in the throttled state
*/
thread->t_page_creation_time = tv_sec;
- thread->t_page_creation_count = (vm_page_creation_throttle / 6) * 5;
+ thread->t_page_creation_count = VM_PAGE_CREATION_THROTTLE_RATE_PER_SEC * (VM_PAGE_CREATION_THROTTLE_PERIOD_SECS - 1);
}
- ++vm_page_throttle_count;
+ VM_PAGEOUT_DEBUG(vm_page_throttle_count, 1);
- return (SOFT_THROTTLE_DELAY);
+ thread->t_page_creation_throttled = 1;
+
+ if (VM_CONFIG_COMPRESSOR_IS_PRESENT && HARD_THROTTLE_LIMIT_REACHED()) {
+#if (DEVELOPMENT || DEBUG)
+ thread->t_page_creation_throttled_hard++;
+ OSAddAtomic(1, &vm_page_creation_throttled_hard);
+#endif /* DEVELOPMENT || DEBUG */
+ return HARD_THROTTLE_DELAY;
+ } else {
+#if (DEVELOPMENT || DEBUG)
+ thread->t_page_creation_throttled_soft++;
+ OSAddAtomic(1, &vm_page_creation_throttled_soft);
+#endif /* DEVELOPMENT || DEBUG */
+ return SOFT_THROTTLE_DELAY;
+ }
}
thread->t_page_creation_time = tv_sec;
thread->t_page_creation_count = 0;
}
- return (0);
+no_throttle:
+ thread->t_page_creation_count++;
+
+ return 0;
}
* cleanup is based on being called from vm_fault_page
*
* object must be locked
- * object == m->object
+ * object == m->vmp_object
*/
static vm_fault_return_t
-vm_fault_check(vm_object_t object, vm_page_t m, vm_page_t first_m, boolean_t interruptible_state)
+vm_fault_check(vm_object_t object, vm_page_t m, vm_page_t first_m, wait_interrupt_t interruptible_state, boolean_t page_throttle)
{
int throttle_delay;
- if (object->shadow_severed ||
+ if (object->shadow_severed ||
VM_OBJECT_PURGEABLE_FAULT_ERROR(object)) {
- /*
+ /*
* Either:
* 1. the shadow chain was severed,
* 2. the purgeable object is volatile or empty and is marked
* to fault on access while volatile.
* Just have to return an error at this point
*/
- if (m != VM_PAGE_NULL)
- VM_PAGE_FREE(m);
+ if (m != VM_PAGE_NULL) {
+ VM_PAGE_FREE(m);
+ }
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_ERROR);
+ return VM_FAULT_MEMORY_ERROR;
}
- if (vm_backing_store_low) {
- /*
- * are we protecting the system from
- * backing store exhaustion. If so
- * sleep unless we are privileged.
- */
- if (!(current_task()->priv_flags & VM_BACKING_STORE_PRIV)) {
-
- if (m != VM_PAGE_NULL)
- VM_PAGE_FREE(m);
+ if (page_throttle == TRUE) {
+ if ((throttle_delay = vm_page_throttled(FALSE))) {
+ /*
+ * we're throttling zero-fills...
+ * treat this as if we couldn't grab a page
+ */
+ if (m != VM_PAGE_NULL) {
+ VM_PAGE_FREE(m);
+ }
vm_fault_cleanup(object, first_m);
- assert_wait((event_t)&vm_backing_store_low, THREAD_UNINT);
+ VM_DEBUG_EVENT(vmf_check_zfdelay, VMF_CHECK_ZFDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
+
+ delay(throttle_delay);
- thread_block(THREAD_CONTINUE_NULL);
+ if (current_thread_aborted()) {
+ thread_interrupt_level(interruptible_state);
+ return VM_FAULT_INTERRUPTED;
+ }
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_RETRY);
+ return VM_FAULT_MEMORY_SHORTAGE;
}
}
- if ((throttle_delay = vm_page_throttled())) {
- /*
- * we're throttling zero-fills...
- * treat this as if we couldn't grab a page
- */
- if (m != VM_PAGE_NULL)
- VM_PAGE_FREE(m);
- vm_fault_cleanup(object, first_m);
-
- VM_DEBUG_EVENT(vmf_check_zfdelay, VMF_CHECK_ZFDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
+ return VM_FAULT_SUCCESS;
+}
- delay(throttle_delay);
+/*
+ * Clear the code signing bits on the given page_t
+ */
+static void
+vm_fault_cs_clear(vm_page_t m)
+{
+ m->vmp_cs_validated = VMP_CS_ALL_FALSE;
+ m->vmp_cs_tainted = VMP_CS_ALL_FALSE;
+ m->vmp_cs_nx = VMP_CS_ALL_FALSE;
+}
- if (current_thread_aborted()) {
- thread_interrupt_level(interruptible_state);
- return VM_FAULT_INTERRUPTED;
- }
- thread_interrupt_level(interruptible_state);
+/*
+ * Enqueues the given page on the throttled queue.
+ * The caller must hold the vm_page_queue_lock and it will be held on return.
+ */
+static void
+vm_fault_enqueue_throttled_locked(vm_page_t m)
+{
+ LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_OWNED);
+ assert(!VM_PAGE_WIRED(m));
- return (VM_FAULT_MEMORY_SHORTAGE);
- }
- return (VM_FAULT_SUCCESS);
+ /*
+ * can't be on the pageout queue since we don't
+ * have a pager to try and clean to
+ */
+ vm_page_queues_remove(m, TRUE);
+ vm_page_check_pageable_safe(m);
+ vm_page_queue_enter(&vm_page_queue_throttled, m, vmp_pageq);
+ m->vmp_q_state = VM_PAGE_ON_THROTTLED_Q;
+ vm_page_throttled_count++;
}
-
/*
* do the work to zero fill a page and
* inject it into the correct paging queue
*
- * m->object must be locked
+ * m->vmp_object must be locked
* page queue lock must NOT be held
*/
static int
vm_fault_zero_page(vm_page_t m, boolean_t no_zero_fill)
{
- int my_fault = DBG_ZERO_FILL_FAULT;
+ int my_fault = DBG_ZERO_FILL_FAULT;
+ vm_object_t object;
+
+ object = VM_PAGE_OBJECT(m);
/*
* This is is a zero-fill page fault...
* execution. i.e. it is the responsibility
* of higher layers to call for an instruction
* sync after changing the contents and before
- * sending a program into this area. We
+ * sending a program into this area. We
* choose this approach for performance
*/
- m->pmapped = TRUE;
-
- m->cs_validated = FALSE;
- m->cs_tainted = FALSE;
+ vm_fault_cs_clear(m);
+ m->vmp_pmapped = TRUE;
if (no_zero_fill == TRUE) {
my_fault = DBG_NZF_PAGE_FAULT;
+
+ if (m->vmp_absent && m->vmp_busy) {
+ return my_fault;
+ }
} else {
vm_page_zero_fill(m);
VM_STAT_INCR(zero_fill_count);
DTRACE_VM2(zfod, int, 1, (uint64_t *), NULL);
}
- assert(!m->laundry);
- assert(m->object != kernel_object);
- //assert(m->pageq.next == NULL && m->pageq.prev == NULL);
-
- if (!VM_DYNAMIC_PAGING_ENABLED(memory_manager_default) &&
- (m->object->purgable == VM_PURGABLE_DENY ||
- m->object->purgable == VM_PURGABLE_NONVOLATILE ||
- m->object->purgable == VM_PURGABLE_VOLATILE )) {
-
+ assert(!m->vmp_laundry);
+ assert(object != kernel_object);
+ //assert(m->vmp_pageq.next == 0 && m->vmp_pageq.prev == 0);
+ if (!VM_DYNAMIC_PAGING_ENABLED() &&
+ (object->purgable == VM_PURGABLE_DENY ||
+ object->purgable == VM_PURGABLE_NONVOLATILE ||
+ object->purgable == VM_PURGABLE_VOLATILE)) {
vm_page_lockspin_queues();
-
- assert(!VM_PAGE_WIRED(m));
-
- VM_PAGE_QUEUES_REMOVE(m);
-
- queue_enter(&vm_page_queue_throttled, m, vm_page_t, pageq);
- m->throttled = TRUE;
- vm_page_throttled_count++;
-
- vm_page_unlock_queues();
- } else {
- if (current_thread()->t_page_creation_count > vm_page_creation_throttle) {
- m->zero_fill = TRUE;
- VM_ZF_COUNT_INCR();
+ if (!VM_DYNAMIC_PAGING_ENABLED()) {
+ vm_fault_enqueue_throttled_locked(m);
}
+ vm_page_unlock_queues();
}
- return (my_fault);
+ return my_fault;
}
* The required permissions for the page is given
* in "fault_type". Desired permissions are included
* in "protection".
- * fault_info is passed along to determine pagein cluster
+ * fault_info is passed along to determine pagein cluster
* limits... it contains the expected reference pattern,
* cluster size if available, etc...
*
* The "result_page" is also left busy. It is not removed
* from the pageout queues.
* Special Case:
- * A return value of VM_FAULT_SUCCESS_NO_PAGE means that the
+ * A return value of VM_FAULT_SUCCESS_NO_PAGE means that the
* fault succeeded but there's no VM page (i.e. the VM object
- * does not actually hold VM pages, but device memory or
+ * does not actually hold VM pages, but device memory or
* large pages). The object is still locked and we still hold a
* paging_in_progress reference.
*/
unsigned int vm_fault_page_blocked_access = 0;
+unsigned int vm_fault_page_forced_retry = 0;
vm_fault_return_t
vm_fault_page(
/* Arguments: */
- vm_object_t first_object, /* Object to begin search */
- vm_object_offset_t first_offset, /* Offset into object */
- vm_prot_t fault_type, /* What access is requested */
- boolean_t must_be_resident,/* Must page be resident? */
+ vm_object_t first_object, /* Object to begin search */
+ vm_object_offset_t first_offset, /* Offset into object */
+ vm_prot_t fault_type, /* What access is requested */
+ boolean_t must_be_resident,/* Must page be resident? */
+ boolean_t caller_lookup, /* caller looked up page */
/* Modifies in place: */
- vm_prot_t *protection, /* Protection for mapping */
+ vm_prot_t *protection, /* Protection for mapping */
+ vm_page_t *result_page, /* Page found, if successful */
/* Returns: */
- vm_page_t *result_page, /* Page found, if successful */
- vm_page_t *top_page, /* Page in top object, if
- * not result_page. */
+ vm_page_t *top_page, /* Page in top object, if
+ * not result_page. */
int *type_of_fault, /* if non-null, fill in with type of fault
- * COW, zero-fill, etc... returned in trace point */
+ * COW, zero-fill, etc... returned in trace point */
/* More arguments: */
- kern_return_t *error_code, /* code if page is in error */
- boolean_t no_zero_fill, /* don't zero fill absent pages */
-#if MACH_PAGEMAP
- boolean_t data_supply, /* treat as data_supply if
- * it is a write fault and a full
- * page is provided */
-#else
- __unused boolean_t data_supply,
-#endif
+ kern_return_t *error_code, /* code if page is in error */
+ boolean_t no_zero_fill, /* don't zero fill absent pages */
+ boolean_t data_supply, /* treat as data_supply if
+ * it is a write fault and a full
+ * page is provided */
vm_object_fault_info_t fault_info)
{
- vm_page_t m;
- vm_object_t object;
- vm_object_offset_t offset;
- vm_page_t first_m;
- vm_object_t next_object;
- vm_object_t copy_object;
- boolean_t look_for_page;
- vm_prot_t access_required = fault_type;
- vm_prot_t wants_copy_flag;
- CLUSTER_STAT(int pages_at_higher_offsets;)
- CLUSTER_STAT(int pages_at_lower_offsets;)
- kern_return_t wait_result;
- boolean_t interruptible_state;
- vm_fault_return_t error;
- int my_fault;
- uint32_t try_failed_count;
- int interruptible; /* how may fault be interrupted? */
- memory_object_t pager;
- vm_fault_return_t retval;
+ vm_page_t m;
+ vm_object_t object;
+ vm_object_offset_t offset;
+ vm_page_t first_m;
+ vm_object_t next_object;
+ vm_object_t copy_object;
+ boolean_t look_for_page;
+ boolean_t force_fault_retry = FALSE;
+ vm_prot_t access_required = fault_type;
+ vm_prot_t wants_copy_flag;
+ kern_return_t wait_result;
+ wait_interrupt_t interruptible_state;
+ boolean_t data_already_requested = FALSE;
+ vm_behavior_t orig_behavior;
+ vm_size_t orig_cluster_size;
+ vm_fault_return_t error;
+ int my_fault;
+ uint32_t try_failed_count;
+ int interruptible; /* how may fault be interrupted? */
+ int external_state = VM_EXTERNAL_STATE_UNKNOWN;
+ memory_object_t pager;
+ vm_fault_return_t retval;
+ int grab_options;
/*
- * MACH page map - an optional optimization where a bit map is maintained
- * by the VM subsystem for internal objects to indicate which pages of
- * the object currently reside on backing store. This existence map
- * duplicates information maintained by the vnode pager. It is
- * created at the time of the first pageout against the object, i.e.
- * at the same time pager for the object is created. The optimization
- * is designed to eliminate pager interaction overhead, if it is
- * 'known' that the page does not exist on backing store.
- *
- * MUST_ASK_PAGER() evaluates to TRUE if the page specified by object/offset is
- * either marked as paged out in the existence map for the object or no
- * existence map exists for the object. MUST_ASK_PAGER() is one of the
- * criteria in the decision to invoke the pager. It is also used as one
- * of the criteria to terminate the scan for adjacent pages in a clustered
- * pagein operation. Note that MUST_ASK_PAGER() always evaluates to TRUE for
- * permanent objects. Note also that if the pager for an internal object
- * has not been created, the pager is not invoked regardless of the value
- * of MUST_ASK_PAGER() and that clustered pagein scans are only done on an object
- * for which a pager has been created.
+ * MUST_ASK_PAGER() evaluates to TRUE if the page specified by object/offset is
+ * marked as paged out in the compressor pager or the pager doesn't exist.
+ * Note also that if the pager for an internal object
+ * has not been created, the pager is not invoked regardless of the value
+ * of MUST_ASK_PAGER().
*
* PAGED_OUT() evaluates to TRUE if the page specified by the object/offset
- * is marked as paged out in the existence map for the object. PAGED_OUT()
+ * is marked as paged out in the compressor pager.
* PAGED_OUT() is used to determine if a page has already been pushed
* into a copy object in order to avoid a redundant page out operation.
*/
-#if MACH_PAGEMAP
-#define MUST_ASK_PAGER(o, f) (vm_external_state_get((o)->existence_map, (f)) \
- != VM_EXTERNAL_STATE_ABSENT)
-#define PAGED_OUT(o, f) (vm_external_state_get((o)->existence_map, (f)) \
- == VM_EXTERNAL_STATE_EXISTS)
-#else
-#define MUST_ASK_PAGER(o, f) (TRUE)
-#define PAGED_OUT(o, f) (FALSE)
-#endif
+#define MUST_ASK_PAGER(o, f, s) \
+ ((s = VM_COMPRESSOR_PAGER_STATE_GET((o), (f))) != VM_EXTERNAL_STATE_ABSENT)
+
+#define PAGED_OUT(o, f) \
+ (VM_COMPRESSOR_PAGER_STATE_GET((o), (f)) == VM_EXTERNAL_STATE_EXISTS)
/*
* Recovery actions
*/
-#define RELEASE_PAGE(m) \
- MACRO_BEGIN \
- PAGE_WAKEUP_DONE(m); \
- if (!m->active && !m->inactive && !m->throttled) { \
- vm_page_lockspin_queues(); \
- if (!m->active && !m->inactive && !m->throttled) \
- vm_page_activate(m); \
- vm_page_unlock_queues(); \
- } \
+#define RELEASE_PAGE(m) \
+ MACRO_BEGIN \
+ PAGE_WAKEUP_DONE(m); \
+ if ( !VM_PAGE_PAGEABLE(m)) { \
+ vm_page_lockspin_queues(); \
+ if ( !VM_PAGE_PAGEABLE(m)) { \
+ if (VM_CONFIG_COMPRESSOR_IS_ACTIVE) \
+ vm_page_deactivate(m); \
+ else \
+ vm_page_activate(m); \
+ } \
+ vm_page_unlock_queues(); \
+ } \
MACRO_END
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0002, (unsigned int) first_object, (unsigned int) first_offset); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0002, (unsigned int) first_object, (unsigned int) first_offset); /* (TEST/DEBUG) */
#endif
-
-#if MACH_KDB
- /*
- * If there are watchpoints set, then
- * we don't want to give away write permission
- * on a read fault. Make the task write fault,
- * so that the watchpoint code notices the access.
- */
- if (db_watchpoint_list) {
- /*
- * If we aren't asking for write permission,
- * then don't give it away. We're using write
- * faults to set the dirty bit.
- */
- if (!(fault_type & VM_PROT_WRITE))
- *protection &= ~VM_PROT_WRITE;
- }
-#endif /* MACH_KDB */
-
interruptible = fault_info->interruptible;
interruptible_state = thread_interrupt_level(interruptible);
-
+
/*
* INVARIANTS (through entire routine):
*
first_m = VM_PAGE_NULL;
access_required = fault_type;
-
- XPR(XPR_VM_FAULT,
- "vm_f_page: obj 0x%X, offset 0x%X, type %d, prot %d\n",
- object, offset, fault_type, *protection, 0);
-
/*
* default type of fault
*/
while (TRUE) {
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0003, (unsigned int) 0, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0003, (unsigned int) 0, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
+
+ grab_options = 0;
+#if CONFIG_SECLUDED_MEMORY
+ if (object->can_grab_secluded) {
+ grab_options |= VM_PAGE_GRAB_SECLUDED;
+ }
+#endif /* CONFIG_SECLUDED_MEMORY */
+
if (!object->alive) {
- /*
+ /*
* object is no longer valid
* clean up and return error
*/
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_ERROR);
+ return VM_FAULT_MEMORY_ERROR;
}
if (!object->pager_created && object->phys_contiguous) {
* must be a "large page" object. We do not deal
* with VM pages for this object.
*/
+ caller_lookup = FALSE;
m = VM_PAGE_NULL;
goto phys_contig_object;
}
* a "activity_in_progress" reference and wait for
* access to be unblocked.
*/
+ caller_lookup = FALSE; /* no longer valid after sleep */
vm_object_activity_begin(object);
vm_object_paging_end(object);
while (object->blocked_access) {
vm_object_sleep(object,
- VM_OBJECT_EVENT_UNBLOCKED,
- THREAD_UNINT);
+ VM_OBJECT_EVENT_UNBLOCKED,
+ THREAD_UNINT);
}
vm_fault_page_blocked_access++;
vm_object_paging_begin(object);
/*
* See whether the page at 'offset' is resident
*/
- m = vm_page_lookup(object, offset);
+ if (caller_lookup == TRUE) {
+ /*
+ * The caller has already looked up the page
+ * and gave us the result in "result_page".
+ * We can use this for the first lookup but
+ * it loses its validity as soon as we unlock
+ * the object.
+ */
+ m = *result_page;
+ caller_lookup = FALSE; /* no longer valid after that */
+ } else {
+ m = vm_page_lookup(object, vm_object_trunc_page(offset));
+ }
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0004, (unsigned int) m, (unsigned int) object); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0004, (unsigned int) m, (unsigned int) object); /* (TEST/DEBUG) */
#endif
if (m != VM_PAGE_NULL) {
-
- if (m->busy) {
- /*
+ if (m->vmp_busy) {
+ /*
* The page is being brought in,
* wait for it and then retry.
- *
- * A possible optimization: if the page
- * is known to be resident, we can ignore
- * pages that are absent (regardless of
- * whether they're busy).
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0005, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0005, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
- if (m->list_req_pending) {
- /*
- * "list_req_pending" means that the
- * page has been marked for a page-in
- * or page-out operation but hasn't been
- * grabbed yet.
- * Since whoever marked it
- * "list_req_pending" might now be
- * making its way through other layers
- * of code and possibly blocked on locks
- * that we might be holding, we can't
- * just block on a "busy" and
- * "list_req_pending" page or we might
- * deadlock with that other thread.
- *
- * [ For pages backed by a file on an
- * HFS volume, we might deadlock with
- * the HFS truncate lock, for example:
- * A: starts a pageout or pagein
- * operation and marks a page "busy",
- * "list_req_pending" and either
- * "pageout", "cleaning" or "absent".
- * A: makes its way through the
- * memory object (vnode) code.
- * B: starts from the memory object
- * side, via a write() on a file, for
- * example.
- * B: grabs some filesystem locks.
- * B: attempts to grab the same page for
- * its I/O.
- * B: blocks here because the page is
- * "busy".
- * A: attempts to grab the filesystem
- * lock we're holding.
- * And we have a deadlock... ]
- *
- * Since the page hasn't been claimed
- * by the other thread yet, it's fair
- * for us to grab here.
- */
- if (m->absent) {
- /*
- * The page needs to be paged
- * in. We can do it here but we
- * need to get rid of "m", the
- * place holder page inserted by
- * another thread who is also
- * trying to page it in. When
- * that thread resumes, it will
- * either wait for our page to
- * arrive or it will find it
- * already there.
- */
- VM_PAGE_FREE(m);
+ wait_result = PAGE_SLEEP(object, m, interruptible);
- /*
- * Retry the fault. We'll find
- * that the page is not resident
- * and initiate a page-in again.
- */
- continue;
- }
- if (m->pageout || m->cleaning) {
- /*
- * This page has been selected
- * for a page-out but we want
- * to bring it in. Let's just
- * cancel the page-out...
- */
- vm_pageout_queue_steal(m, FALSE);
- /*
- * ... and clear "busy" and
- * wake up any waiters...
- */
- PAGE_WAKEUP_DONE(m);
- /*
- * ... and continue with the
- * "fault" handling.
- */
- }
- } else {
- wait_result = PAGE_SLEEP(object, m, interruptible);
- XPR(XPR_VM_FAULT,
- "vm_f_page: block busy obj 0x%X, offset 0x%X, page 0x%X\n",
- object, offset,
- m, 0, 0);
- counter(c_vm_fault_page_block_busy_kernel++);
+ counter(c_vm_fault_page_block_busy_kernel++);
- if (wait_result != THREAD_AWAKENED) {
- vm_fault_cleanup(object, first_m);
- thread_interrupt_level(interruptible_state);
+ if (wait_result != THREAD_AWAKENED) {
+ vm_fault_cleanup(object, first_m);
+ thread_interrupt_level(interruptible_state);
- if (wait_result == THREAD_RESTART)
- return (VM_FAULT_RETRY);
- else
- return (VM_FAULT_INTERRUPTED);
+ if (wait_result == THREAD_RESTART) {
+ return VM_FAULT_RETRY;
+ } else {
+ return VM_FAULT_INTERRUPTED;
}
- continue;
}
+ continue;
}
+ if (m->vmp_laundry) {
+ m->vmp_free_when_done = FALSE;
- if (m->phys_page == vm_page_guard_addr) {
+ if (!m->vmp_cleaning) {
+ vm_pageout_steal_laundry(m, FALSE);
+ }
+ }
+ if (VM_PAGE_GET_PHYS_PAGE(m) == vm_page_guard_addr) {
/*
* Guard page: off limits !
*/
* be just to wire or unwire it.
* Let's pretend it succeeded...
*/
- m->busy = TRUE;
+ m->vmp_busy = TRUE;
*result_page = m;
assert(first_m == VM_PAGE_NULL);
*top_page = first_m;
- if (type_of_fault)
+ if (type_of_fault) {
*type_of_fault = DBG_GUARD_FAULT;
+ }
+ thread_interrupt_level(interruptible_state);
return VM_FAULT_SUCCESS;
} else {
/*
}
}
- if (m->error) {
- /*
+ if (m->vmp_error) {
+ /*
* The page is in error, give up now.
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0006, (unsigned int) m, (unsigned int) error_code); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0006, (unsigned int) m, (unsigned int) error_code); /* (TEST/DEBUG) */
#endif
- if (error_code)
- *error_code = KERN_MEMORY_ERROR;
+ if (error_code) {
+ *error_code = KERN_MEMORY_ERROR;
+ }
VM_PAGE_FREE(m);
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_ERROR);
+ return VM_FAULT_MEMORY_ERROR;
}
- if (m->restart) {
- /*
+ if (m->vmp_restart) {
+ /*
* The pager wants us to restart
* at the top of the chain,
* typically because it has moved the
* page to another pager, then do so.
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0007, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0007, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
VM_PAGE_FREE(m);
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_RETRY);
+ return VM_FAULT_RETRY;
}
- if (m->absent) {
- /*
+ if (m->vmp_absent) {
+ /*
* The page isn't busy, but is absent,
* therefore it's deemed "unavailable".
*
* next object (if there is one).
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0008, (unsigned int) m, (unsigned int) object->shadow); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0008, (unsigned int) m, (unsigned int) object->shadow); /* (TEST/DEBUG) */
#endif
next_object = object->shadow;
/*
* check for any conditions that prevent
* us from creating a new zero-fill page
- * vm_fault_check will do all of the
+ * vm_fault_check will do all of the
* fault cleanup in the case of an error condition
* including resetting the thread_interrupt_level
*/
- error = vm_fault_check(object, m, first_m, interruptible_state);
+ error = vm_fault_check(object, m, first_m, interruptible_state, (type_of_fault == NULL) ? TRUE : FALSE);
- if (error != VM_FAULT_SUCCESS)
- return (error);
-
- XPR(XPR_VM_FAULT,
- "vm_f_page: zero obj 0x%X, off 0x%X, page 0x%X, first_obj 0x%X\n",
- object, offset,
- m,
- first_object, 0);
+ if (error != VM_FAULT_SUCCESS) {
+ return error;
+ }
if (object != first_object) {
- /*
+ /*
* free the absent page we just found
*/
VM_PAGE_FREE(m);
vm_object_unlock(object);
/*
- * grab the original page we
+ * grab the original page we
* 'soldered' in place and
* retake lock on 'first_object'
*/
vm_object_lock(object);
} else {
- /*
+ /*
* we're going to use the absent page we just found
* so convert it to a 'busy' page
*/
- m->absent = FALSE;
- m->busy = TRUE;
+ m->vmp_absent = FALSE;
+ m->vmp_busy = TRUE;
+ }
+ if (fault_info->mark_zf_absent && no_zero_fill == TRUE) {
+ m->vmp_absent = TRUE;
}
/*
* zero-fill the page and put it on
*/
my_fault = vm_fault_zero_page(m, no_zero_fill);
- if (fault_info->mark_zf_absent && no_zero_fill == TRUE)
- m->absent = TRUE;
-
break;
} else {
- if (must_be_resident)
+ if (must_be_resident) {
vm_object_paging_end(object);
- else if (object != first_object) {
+ } else if (object != first_object) {
vm_object_paging_end(object);
VM_PAGE_FREE(m);
} else {
first_m = m;
- m->absent = FALSE;
- m->busy = TRUE;
+ m->vmp_absent = FALSE;
+ m->vmp_busy = TRUE;
vm_page_lockspin_queues();
- VM_PAGE_QUEUES_REMOVE(m);
+ vm_page_queues_remove(m, FALSE);
vm_page_unlock_queues();
}
- XPR(XPR_VM_FAULT,
- "vm_f_page: unavail obj 0x%X, off 0x%X, next_obj 0x%X, newoff 0x%X\n",
- object, offset,
- next_object,
- offset+object->vo_shadow_offset,0);
offset += object->vo_shadow_offset;
fault_info->lo_offset += object->vo_shadow_offset;
vm_object_unlock(object);
object = next_object;
vm_object_paging_begin(object);
-
+
/*
* reset to default type of fault
*/
continue;
}
}
- if ((m->cleaning)
+ if ((m->vmp_cleaning)
&& ((object != first_object) || (object->copy != VM_OBJECT_NULL))
&& (fault_type & VM_PROT_WRITE)) {
/*
* wired mapping.
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0009, (unsigned int) m, (unsigned int) offset); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0009, (unsigned int) m, (unsigned int) offset); /* (TEST/DEBUG) */
#endif
- XPR(XPR_VM_FAULT,
- "vm_f_page: cleaning obj 0x%X, offset 0x%X, page 0x%X\n",
- object, offset,
- m, 0, 0);
/*
* take an extra ref so that object won't die
*/
vm_object_reference_locked(object);
vm_fault_cleanup(object, first_m);
-
+
counter(c_vm_fault_page_block_backoff_kernel++);
vm_object_lock(object);
assert(object->ref_count > 0);
- m = vm_page_lookup(object, offset);
+ m = vm_page_lookup(object, vm_object_trunc_page(offset));
- if (m != VM_PAGE_NULL && m->cleaning) {
+ if (m != VM_PAGE_NULL && m->vmp_cleaning) {
PAGE_ASSERT_WAIT(m, interruptible);
vm_object_unlock(object);
vm_object_deallocate(object);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_RETRY);
+ return VM_FAULT_RETRY;
}
}
- if (type_of_fault == NULL && m->speculative &&
+ if (type_of_fault == NULL && (m->vmp_q_state == VM_PAGE_ON_SPECULATIVE_Q) &&
!(fault_info != NULL && fault_info->stealth)) {
- /*
+ /*
* If we were passed a non-NULL pointer for
* "type_of_fault", than we came from
* vm_fault... we'll let it deal with
* this condition, since it
- * needs to see m->speculative to correctly
+ * needs to see m->vmp_speculative to correctly
* account the pageins, otherwise...
* take it off the speculative queue, we'll
* let the caller of vm_fault_page deal
* it wants a "stealth" fault, we also leave
* the page in the speculative queue.
*/
- vm_page_lockspin_queues();
- VM_PAGE_QUEUES_REMOVE(m);
- vm_page_unlock_queues();
- }
-
- if (m->encrypted) {
- /*
- * ENCRYPTED SWAP:
- * the user needs access to a page that we
- * encrypted before paging it out.
- * Decrypt the page now.
- * Keep it busy to prevent anyone from
- * accessing it during the decryption.
- */
- m->busy = TRUE;
- vm_page_decrypt(m, 0);
- assert(object == m->object);
- assert(m->busy);
- PAGE_WAKEUP_DONE(m);
-
- /*
- * Retry from the top, in case
- * something changed while we were
- * decrypting.
- */
- continue;
+ vm_page_lockspin_queues();
+ if (m->vmp_q_state == VM_PAGE_ON_SPECULATIVE_Q) {
+ vm_page_queues_remove(m, FALSE);
+ }
+ vm_page_unlock_queues();
}
- ASSERT_PAGE_DECRYPTED(m);
+ assert(object == VM_PAGE_OBJECT(m));
- if (m->object->code_signed) {
+ if (object->code_signed) {
/*
* CODE SIGNING:
* We just paged in a page from a signed
* remove the page from the queue, but not the object
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF000B, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF000B, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
- XPR(XPR_VM_FAULT,
- "vm_f_page: found page obj 0x%X, offset 0x%X, page 0x%X\n",
- object, offset, m, 0, 0);
- assert(!m->busy);
- assert(!m->absent);
+ assert(!m->vmp_busy);
+ assert(!m->vmp_absent);
- m->busy = TRUE;
+ m->vmp_busy = TRUE;
break;
}
-
+
/*
* we get here when there is no page present in the object at
* this object can provide the data or we're the top object...
* object is locked; m == NULL
*/
- look_for_page = (object->pager_created && (MUST_ASK_PAGER(object, offset) == TRUE) && !data_supply);
-
+
+ if (must_be_resident) {
+ if (fault_type == VM_PROT_NONE &&
+ object == kernel_object) {
+ /*
+ * We've been called from vm_fault_unwire()
+ * while removing a map entry that was allocated
+ * with KMA_KOBJECT and KMA_VAONLY. This page
+ * is not present and there's nothing more to
+ * do here (nothing to unwire).
+ */
+ vm_fault_cleanup(object, first_m);
+ thread_interrupt_level(interruptible_state);
+
+ return VM_FAULT_MEMORY_ERROR;
+ }
+
+ goto dont_look_for_page;
+ }
+
+ /* Don't expect to fault pages into the kernel object. */
+ assert(object != kernel_object);
+
+ data_supply = FALSE;
+
+ look_for_page = (object->pager_created && (MUST_ASK_PAGER(object, offset, external_state) == TRUE) && !data_supply);
+
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF000C, (unsigned int) look_for_page, (unsigned int) object); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF000C, (unsigned int) look_for_page, (unsigned int) object); /* (TEST/DEBUG) */
#endif
- if ((look_for_page || (object == first_object)) && !must_be_resident && !object->phys_contiguous) {
+ if (!look_for_page && object == first_object && !object->phys_contiguous) {
/*
- * Allocate a new page for this object/offset pair
+ * Allocate a new page for this object/offset pair as a placeholder
*/
- m = vm_page_grab();
+ m = vm_page_grab_options(grab_options);
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF000D, (unsigned int) m, (unsigned int) object); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF000D, (unsigned int) m, (unsigned int) object); /* (TEST/DEBUG) */
#endif
if (m == VM_PAGE_NULL) {
-
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_SHORTAGE);
+ return VM_FAULT_MEMORY_SHORTAGE;
+ }
+
+ if (fault_info && fault_info->batch_pmap_op == TRUE) {
+ vm_page_insert_internal(m, object,
+ vm_object_trunc_page(offset),
+ VM_KERN_MEMORY_NONE, FALSE, TRUE, TRUE, FALSE, NULL);
+ } else {
+ vm_page_insert(m, object, vm_object_trunc_page(offset));
}
- vm_page_insert(m, object, offset);
}
- if (look_for_page && !must_be_resident) {
- kern_return_t rc;
+ if (look_for_page) {
+ kern_return_t rc;
+ int my_fault_type;
/*
* If the memory manager is not ready, we
*/
if (!object->pager_ready) {
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF000E, (unsigned int) 0, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF000E, (unsigned int) 0, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
- if (m != VM_PAGE_NULL)
- VM_PAGE_FREE(m);
-
- XPR(XPR_VM_FAULT,
- "vm_f_page: ready wait obj 0x%X, offset 0x%X\n",
- object, offset, 0, 0, 0);
+ if (m != VM_PAGE_NULL) {
+ VM_PAGE_FREE(m);
+ }
/*
* take an extra ref so object won't die
wait_result = vm_object_assert_wait(object, VM_OBJECT_EVENT_PAGER_READY, interruptible);
vm_object_unlock(object);
- if (wait_result == THREAD_WAITING)
+ if (wait_result == THREAD_WAITING) {
wait_result = thread_block(THREAD_CONTINUE_NULL);
+ }
vm_object_deallocate(object);
goto backoff;
vm_object_deallocate(object);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_RETRY);
+ return VM_FAULT_RETRY;
}
}
if (!object->internal && !object->phys_contiguous && object->paging_in_progress > vm_object_pagein_throttle) {
* wait for them to be resolved now.
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0010, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0010, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
- if (m != VM_PAGE_NULL)
+ if (m != VM_PAGE_NULL) {
VM_PAGE_FREE(m);
+ }
/*
* take an extra ref so object won't die
*/
assert(object->ref_count > 0);
if (object->paging_in_progress >= vm_object_pagein_throttle) {
- vm_object_assert_wait(object, VM_OBJECT_EVENT_PAGING_ONLY_IN_PROGRESS, interruptible);
+ vm_object_assert_wait(object, VM_OBJECT_EVENT_PAGING_ONLY_IN_PROGRESS, interruptible);
vm_object_unlock(object);
wait_result = thread_block(THREAD_CONTINUE_NULL);
vm_object_deallocate(object);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_RETRY);
+ return VM_FAULT_RETRY;
}
}
- if (m != VM_PAGE_NULL) {
- /*
- * Indicate that the page is waiting for data
- * from the memory manager.
- */
- m->list_req_pending = TRUE;
- m->absent = TRUE;
- }
+ if (object->internal) {
+ int compressed_count_delta;
+
+ assert(VM_CONFIG_COMPRESSOR_IS_PRESENT);
+
+ if (m == VM_PAGE_NULL) {
+ /*
+ * Allocate a new page for this object/offset pair as a placeholder
+ */
+ m = vm_page_grab_options(grab_options);
+#if TRACEFAULTPAGE
+ dbgTrace(0xBEEF000D, (unsigned int) m, (unsigned int) object); /* (TEST/DEBUG) */
+#endif
+ if (m == VM_PAGE_NULL) {
+ vm_fault_cleanup(object, first_m);
+ thread_interrupt_level(interruptible_state);
+
+ return VM_FAULT_MEMORY_SHORTAGE;
+ }
+
+ m->vmp_absent = TRUE;
+ if (fault_info && fault_info->batch_pmap_op == TRUE) {
+ vm_page_insert_internal(m, object, vm_object_trunc_page(offset), VM_KERN_MEMORY_NONE, FALSE, TRUE, TRUE, FALSE, NULL);
+ } else {
+ vm_page_insert(m, object, vm_object_trunc_page(offset));
+ }
+ }
+ assert(m->vmp_busy);
+
+ m->vmp_absent = TRUE;
+ pager = object->pager;
+
+ assert(object->paging_in_progress > 0);
+ vm_object_unlock(object);
+
+ rc = vm_compressor_pager_get(
+ pager,
+ offset + object->paging_offset,
+ VM_PAGE_GET_PHYS_PAGE(m),
+ &my_fault_type,
+ 0,
+ &compressed_count_delta);
+
+ if (type_of_fault == NULL) {
+ int throttle_delay;
+
+ /*
+ * we weren't called from vm_fault, so we
+ * need to apply page creation throttling
+ * do it before we re-acquire any locks
+ */
+ if (my_fault_type == DBG_COMPRESSOR_FAULT) {
+ if ((throttle_delay = vm_page_throttled(TRUE))) {
+ VM_DEBUG_EVENT(vmf_compressordelay, VMF_COMPRESSORDELAY, DBG_FUNC_NONE, throttle_delay, 0, 1, 0);
+ delay(throttle_delay);
+ }
+ }
+ }
+ vm_object_lock(object);
+ assert(object->paging_in_progress > 0);
+
+ vm_compressor_pager_count(
+ pager,
+ compressed_count_delta,
+ FALSE, /* shared_lock */
+ object);
+
+ switch (rc) {
+ case KERN_SUCCESS:
+ m->vmp_absent = FALSE;
+ m->vmp_dirty = TRUE;
+ if ((object->wimg_bits &
+ VM_WIMG_MASK) !=
+ VM_WIMG_USE_DEFAULT) {
+ /*
+ * If the page is not cacheable,
+ * we can't let its contents
+ * linger in the data cache
+ * after the decompression.
+ */
+ pmap_sync_page_attributes_phys(
+ VM_PAGE_GET_PHYS_PAGE(m));
+ } else {
+ m->vmp_written_by_kernel = TRUE;
+ }
+
+ /*
+ * If the object is purgeable, its
+ * owner's purgeable ledgers have been
+ * updated in vm_page_insert() but the
+ * page was also accounted for in a
+ * "compressed purgeable" ledger, so
+ * update that now.
+ */
+ if (((object->purgable !=
+ VM_PURGABLE_DENY) ||
+ object->vo_ledger_tag) &&
+ (object->vo_owner !=
+ NULL)) {
+ /*
+ * One less compressed
+ * purgeable/tagged page.
+ */
+ vm_object_owner_compressed_update(
+ object,
+ -1);
+ }
+
+ break;
+ case KERN_MEMORY_FAILURE:
+ m->vmp_unusual = TRUE;
+ m->vmp_error = TRUE;
+ m->vmp_absent = FALSE;
+ break;
+ case KERN_MEMORY_ERROR:
+ assert(m->vmp_absent);
+ break;
+ default:
+ panic("vm_fault_page(): unexpected "
+ "error %d from "
+ "vm_compressor_pager_get()\n",
+ rc);
+ }
+ PAGE_WAKEUP_DONE(m);
+
+ rc = KERN_SUCCESS;
+ goto data_requested;
+ }
+ my_fault_type = DBG_PAGEIN_FAULT;
+
+ if (m != VM_PAGE_NULL) {
+ VM_PAGE_FREE(m);
+ m = VM_PAGE_NULL;
+ }
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0012, (unsigned int) object, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0012, (unsigned int) object, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
/*
* It's possible someone called vm_object_destroy while we weren't
- * holding the object lock. If that has happened, then bail out
+ * holding the object lock. If that has happened, then bail out
* here.
*/
* so we can release the object lock.
*/
+ if (object->object_is_shared_cache) {
+ set_thread_rwlock_boost();
+ }
+
vm_object_unlock(object);
/*
* and its pushing pages up into a copy of
* the object that it manages.
*/
- if (object->copy_strategy == MEMORY_OBJECT_COPY_CALL && object != first_object)
+ if (object->copy_strategy == MEMORY_OBJECT_COPY_CALL && object != first_object) {
wants_copy_flag = VM_PROT_WANTS_COPY;
- else
+ } else {
wants_copy_flag = VM_PROT_NONE;
+ }
+
+ if (object->copy == first_object) {
+ /*
+ * if we issue the memory_object_data_request in
+ * this state, we are subject to a deadlock with
+ * the underlying filesystem if it is trying to
+ * shrink the file resulting in a push of pages
+ * into the copy object... that push will stall
+ * on the placeholder page, and if the pushing thread
+ * is holding a lock that is required on the pagein
+ * path (such as a truncate lock), we'll deadlock...
+ * to avoid this potential deadlock, we throw away
+ * our placeholder page before calling memory_object_data_request
+ * and force this thread to retry the vm_fault_page after
+ * we have issued the I/O. the second time through this path
+ * we will find the page already in the cache (presumably still
+ * busy waiting for the I/O to complete) and then complete
+ * the fault w/o having to go through memory_object_data_request again
+ */
+ assert(first_m != VM_PAGE_NULL);
+ assert(VM_PAGE_OBJECT(first_m) == first_object);
+
+ vm_object_lock(first_object);
+ VM_PAGE_FREE(first_m);
+ vm_object_paging_end(first_object);
+ vm_object_unlock(first_object);
+
+ first_m = VM_PAGE_NULL;
+ force_fault_retry = TRUE;
+
+ vm_fault_page_forced_retry++;
+ }
- XPR(XPR_VM_FAULT,
- "vm_f_page: data_req obj 0x%X, offset 0x%X, page 0x%X, acc %d\n",
- object, offset, m,
- access_required | wants_copy_flag, 0);
+ if (data_already_requested == TRUE) {
+ orig_behavior = fault_info->behavior;
+ orig_cluster_size = fault_info->cluster_size;
+ fault_info->behavior = VM_BEHAVIOR_RANDOM;
+ fault_info->cluster_size = PAGE_SIZE;
+ }
/*
* Call the memory manager to retrieve the data.
*/
rc = memory_object_data_request(
pager,
- offset + object->paging_offset,
+ vm_object_trunc_page(offset) + object->paging_offset,
PAGE_SIZE,
access_required | wants_copy_flag,
(memory_object_fault_info_t)fault_info);
+ if (data_already_requested == TRUE) {
+ fault_info->behavior = orig_behavior;
+ fault_info->cluster_size = orig_cluster_size;
+ } else {
+ data_already_requested = TRUE;
+ }
+
+ DTRACE_VM2(maj_fault, int, 1, (uint64_t *), NULL);
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0013, (unsigned int) object, (unsigned int) rc); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0013, (unsigned int) object, (unsigned int) rc); /* (TEST/DEBUG) */
#endif
vm_object_lock(object);
- if (rc != KERN_SUCCESS) {
+ if (object->object_is_shared_cache) {
+ clear_thread_rwlock_boost();
+ }
+data_requested:
+ if (rc != KERN_SUCCESS) {
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return ((rc == MACH_SEND_INTERRUPTED) ?
- VM_FAULT_INTERRUPTED :
- VM_FAULT_MEMORY_ERROR);
+ return (rc == MACH_SEND_INTERRUPTED) ?
+ VM_FAULT_INTERRUPTED :
+ VM_FAULT_MEMORY_ERROR;
} else {
clock_sec_t tv_sec;
clock_usec_t tv_usec;
-
- clock_get_system_microtime(&tv_sec, &tv_usec);
- current_thread()->t_page_creation_time = tv_sec;
- current_thread()->t_page_creation_count = 0;
+
+ if (my_fault_type == DBG_PAGEIN_FAULT) {
+ clock_get_system_microtime(&tv_sec, &tv_usec);
+ current_thread()->t_page_creation_time = tv_sec;
+ current_thread()->t_page_creation_count = 0;
+ }
}
if ((interruptible != THREAD_UNINT) && (current_thread()->sched_flags & TH_SFLAG_ABORT)) {
+ vm_fault_cleanup(object, first_m);
+ thread_interrupt_level(interruptible_state);
+ return VM_FAULT_INTERRUPTED;
+ }
+ if (force_fault_retry == TRUE) {
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_INTERRUPTED);
+ return VM_FAULT_RETRY;
}
if (m == VM_PAGE_NULL && object->phys_contiguous) {
/*
* No page here means that the object we
- * initially looked up was "physically
+ * initially looked up was "physically
* contiguous" (i.e. device memory). However,
* with Virtual VRAM, the object might not
* be backed by that device memory anymore,
* page fault against the object's new backing
* store (different memory object).
*/
- phys_contig_object:
+phys_contig_object:
goto done;
}
/*
* if we make it through the state checks
* above, than we'll count it as such
*/
- my_fault = DBG_PAGEIN_FAULT;
+ my_fault = my_fault_type;
/*
* Retry with same object/offset, since new data may
*/
continue;
}
-
+dont_look_for_page:
/*
- * We get here if the object has no pager, or an existence map
+ * We get here if the object has no pager, or an existence map
* exists and indicates the page isn't present on the pager
* or we're unwiring a page. If a pager exists, but there
- * is no existence map, then the m->absent case above handles
+ * is no existence map, then the m->vmp_absent case above handles
* the ZF case when the pager can't provide the page
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0014, (unsigned int) object, (unsigned int) m); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0014, (unsigned int) object, (unsigned int) m); /* (TEST/DEBUG) */
#endif
- if (object == first_object)
+ if (object == first_object) {
first_m = m;
- else
+ } else {
assert(m == VM_PAGE_NULL);
-
- XPR(XPR_VM_FAULT,
- "vm_f_page: no pager obj 0x%X, offset 0x%X, page 0x%X, next_obj 0x%X\n",
- object, offset, m,
- object->shadow, 0);
+ }
next_object = object->shadow;
vm_object_lock(object);
}
m = first_m;
- assert(m->object == object);
+ assert(VM_PAGE_OBJECT(m) == object);
first_m = VM_PAGE_NULL;
/*
* check for any conditions that prevent
* us from creating a new zero-fill page
- * vm_fault_check will do all of the
+ * vm_fault_check will do all of the
* fault cleanup in the case of an error condition
* including resetting the thread_interrupt_level
*/
- error = vm_fault_check(object, m, first_m, interruptible_state);
+ error = vm_fault_check(object, m, first_m, interruptible_state, (type_of_fault == NULL) ? TRUE : FALSE);
- if (error != VM_FAULT_SUCCESS)
- return (error);
+ if (error != VM_FAULT_SUCCESS) {
+ return error;
+ }
if (m == VM_PAGE_NULL) {
- m = vm_page_grab();
+ m = vm_page_grab_options(grab_options);
if (m == VM_PAGE_NULL) {
vm_fault_cleanup(object, VM_PAGE_NULL);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_SHORTAGE);
+ return VM_FAULT_MEMORY_SHORTAGE;
}
- vm_page_insert(m, object, offset);
+ vm_page_insert(m, object, vm_object_trunc_page(offset));
+ }
+ if (fault_info->mark_zf_absent && no_zero_fill == TRUE) {
+ m->vmp_absent = TRUE;
}
+
my_fault = vm_fault_zero_page(m, no_zero_fill);
- if (fault_info->mark_zf_absent && no_zero_fill == TRUE)
- m->absent = TRUE;
break;
-
} else {
- /*
+ /*
* Move on to the next object. Lock the next
* object before unlocking the current one.
*/
- if ((object != first_object) || must_be_resident)
+ if ((object != first_object) || must_be_resident) {
vm_object_paging_end(object);
+ }
offset += object->vo_shadow_offset;
fault_info->lo_offset += object->vo_shadow_offset;
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0015, (unsigned int) object, (unsigned int) m); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0015, (unsigned int) object, (unsigned int) m); /* (TEST/DEBUG) */
#endif
-#if EXTRA_ASSERTIONS
- assert(m->busy && !m->absent);
+#if EXTRA_ASSERTIONS
+ assert(m->vmp_busy && !m->vmp_absent);
assert((first_m == VM_PAGE_NULL) ||
- (first_m->busy && !first_m->absent &&
- !first_m->active && !first_m->inactive));
-#endif /* EXTRA_ASSERTIONS */
-
- /*
- * ENCRYPTED SWAP:
- * If we found a page, we must have decrypted it before we
- * get here...
- */
- ASSERT_PAGE_DECRYPTED(m);
-
- XPR(XPR_VM_FAULT,
- "vm_f_page: FOUND obj 0x%X, off 0x%X, page 0x%X, 1_obj 0x%X, 1_m 0x%X\n",
- object, offset, m,
- first_object, first_m);
+ (first_m->vmp_busy && !first_m->vmp_absent &&
+ !first_m->vmp_active && !first_m->vmp_inactive && !first_m->vmp_secluded));
+#endif /* EXTRA_ASSERTIONS */
/*
* If the page is being written, but isn't
* by the top-level object.
*/
if (object != first_object) {
-
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0016, (unsigned int) object, (unsigned int) fault_type); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0016, (unsigned int) object, (unsigned int) fault_type); /* (TEST/DEBUG) */
#endif
- if (fault_type & VM_PROT_WRITE) {
+ if (fault_type & VM_PROT_WRITE) {
vm_page_t copy_m;
/*
*/
assert(!must_be_resident);
- /*
- * are we protecting the system from
- * backing store exhaustion. If so
- * sleep unless we are privileged.
- */
- if (vm_backing_store_low) {
- if (!(current_task()->priv_flags & VM_BACKING_STORE_PRIV)) {
-
- RELEASE_PAGE(m);
- vm_fault_cleanup(object, first_m);
-
- assert_wait((event_t)&vm_backing_store_low, THREAD_UNINT);
-
- thread_block(THREAD_CONTINUE_NULL);
- thread_interrupt_level(interruptible_state);
-
- return (VM_FAULT_RETRY);
- }
- }
/*
* If we try to collapse first_object at this
* point, we may deadlock when we try to get
/*
* Allocate a page for the copy
*/
- copy_m = vm_page_grab();
+ copy_m = vm_page_grab_options(grab_options);
if (copy_m == VM_PAGE_NULL) {
RELEASE_PAGE(m);
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_SHORTAGE);
+ return VM_FAULT_MEMORY_SHORTAGE;
}
- XPR(XPR_VM_FAULT,
- "vm_f_page: page_copy obj 0x%X, offset 0x%X, m 0x%X, copy_m 0x%X\n",
- object, offset,
- m, copy_m, 0);
vm_page_copy(m, copy_m);
* access to this page, then we could
* avoid the pmap_disconnect() call.
*/
- if (m->pmapped)
- pmap_disconnect(m->phys_page);
+ if (m->vmp_pmapped) {
+ pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m));
+ }
- assert(!m->cleaning);
+ if (m->vmp_clustered) {
+ VM_PAGE_COUNT_AS_PAGEIN(m);
+ VM_PAGE_CONSUME_CLUSTERED(m);
+ }
+ assert(!m->vmp_cleaning);
/*
* We no longer need the old page or object.
*/
- PAGE_WAKEUP_DONE(m);
+ RELEASE_PAGE(m);
+
+ /*
+ * This check helps with marking the object as having a sequential pattern
+ * Normally we'll miss doing this below because this fault is about COW to
+ * the first_object i.e. bring page in from disk, push to object above but
+ * don't update the file object's sequential pattern.
+ */
+ if (object->internal == FALSE) {
+ vm_fault_is_sequential(object, offset, fault_info->behavior);
+ }
+
vm_object_paging_end(object);
vm_object_unlock(object);
*/
VM_PAGE_FREE(first_m);
first_m = VM_PAGE_NULL;
-
+
/*
* and replace it with the
* page we just copied into
*/
- assert(copy_m->busy);
- vm_page_insert(copy_m, object, offset);
- copy_m->dirty = TRUE;
+ assert(copy_m->vmp_busy);
+ vm_page_insert(copy_m, object, vm_object_trunc_page(offset));
+ SET_PAGE_DIRTY(copy_m, TRUE);
m = copy_m;
/*
* way, let's try to collapse the top object.
* But we have to play ugly games with
* paging_in_progress to do that...
- */
- vm_object_paging_end(object);
- vm_object_collapse(object, offset, TRUE);
+ */
+ vm_object_paging_end(object);
+ vm_object_collapse(object, vm_object_trunc_page(offset), TRUE);
vm_object_paging_begin(object);
-
- } else
- *protection &= (~VM_PROT_WRITE);
+ } else {
+ *protection &= (~VM_PROT_WRITE);
+ }
}
/*
* Now check whether the page needs to be pushed into the
try_failed_count = 0;
while ((copy_object = first_object->copy) != VM_OBJECT_NULL) {
- vm_object_offset_t copy_offset;
- vm_page_t copy_m;
+ vm_object_offset_t copy_offset;
+ vm_page_t copy_m;
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0017, (unsigned int) copy_object, (unsigned int) fault_type); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0017, (unsigned int) copy_object, (unsigned int) fault_type); /* (TEST/DEBUG) */
#endif
/*
* If the page is being written, but hasn't been
* If the page was guaranteed to be resident,
* we must have already performed the copy.
*/
- if (must_be_resident)
+ if (must_be_resident) {
break;
+ }
/*
* Try to get the lock on the copy_object.
*/
if (!vm_object_lock_try(copy_object)) {
-
vm_object_unlock(object);
try_failed_count++;
- mutex_pause(try_failed_count); /* wait a bit */
+ mutex_pause(try_failed_count); /* wait a bit */
vm_object_lock(object);
continue;
* Does the page exist in the copy?
*/
copy_offset = first_offset - copy_object->vo_shadow_offset;
+ copy_offset = vm_object_trunc_page(copy_offset);
- if (copy_object->vo_size <= copy_offset)
+ if (copy_object->vo_size <= copy_offset) {
/*
* Copy object doesn't cover this page -- do nothing.
*/
;
- else if ((copy_m = vm_page_lookup(copy_object, copy_offset)) != VM_PAGE_NULL) {
+ } else if ((copy_m = vm_page_lookup(copy_object, copy_offset)) != VM_PAGE_NULL) {
/*
* Page currently exists in the copy object
*/
- if (copy_m->busy) {
+ if (copy_m->vmp_busy) {
/*
* If the page is being brought
* in, wait for it and then retry.
copy_object->ref_count--;
assert(copy_object->ref_count > 0);
copy_m = vm_page_lookup(copy_object, copy_offset);
- /*
- * ENCRYPTED SWAP:
- * it's OK if the "copy_m" page is encrypted,
- * because we're not moving it nor handling its
- * contents.
- */
- if (copy_m != VM_PAGE_NULL && copy_m->busy) {
+
+ if (copy_m != VM_PAGE_NULL && copy_m->vmp_busy) {
PAGE_ASSERT_WAIT(copy_m, interruptible);
vm_object_unlock(copy_object);
vm_object_deallocate(copy_object);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_RETRY);
+ return VM_FAULT_RETRY;
}
}
- }
- else if (!PAGED_OUT(copy_object, copy_offset)) {
+ } else if (!PAGED_OUT(copy_object, copy_offset)) {
/*
* If PAGED_OUT is TRUE, then the page used to exist
* in the copy-object, and has already been paged out.
* for example) or it hasn't been paged out.
* (VM_EXTERNAL_STATE_UNKNOWN||VM_EXTERNAL_STATE_ABSENT)
* We must copy the page to the copy object.
- */
-
- if (vm_backing_store_low) {
- /*
- * we are protecting the system from
- * backing store exhaustion. If so
- * sleep unless we are privileged.
- */
- if (!(current_task()->priv_flags & VM_BACKING_STORE_PRIV)) {
- assert_wait((event_t)&vm_backing_store_low, THREAD_UNINT);
-
- RELEASE_PAGE(m);
- VM_OBJ_RES_DECR(copy_object);
- vm_object_lock_assert_exclusive(copy_object);
- copy_object->ref_count--;
- assert(copy_object->ref_count > 0);
-
- vm_object_unlock(copy_object);
- vm_fault_cleanup(object, first_m);
- thread_block(THREAD_CONTINUE_NULL);
- thread_interrupt_level(interruptible_state);
-
- return (VM_FAULT_RETRY);
- }
- }
- /*
+ *
* Allocate a page for the copy
*/
copy_m = vm_page_alloc(copy_object, copy_offset);
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_SHORTAGE);
+ return VM_FAULT_MEMORY_SHORTAGE;
}
/*
* Must copy page into copy-object.
*/
vm_page_copy(m, copy_m);
-
+
/*
* If the old page was in use by any users
* of the copy-object, it must be removed
* from all pmaps. (We can't know which
* pmaps use it.)
*/
- if (m->pmapped)
- pmap_disconnect(m->phys_page);
+ if (m->vmp_pmapped) {
+ pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m));
+ }
+ if (m->vmp_clustered) {
+ VM_PAGE_COUNT_AS_PAGEIN(m);
+ VM_PAGE_CONSUME_CLUSTERED(m);
+ }
/*
* If there's a pager, then immediately
* page out this page, using the "initialize"
* option. Else, we use the copy.
*/
- if ((!copy_object->pager_created)
-#if MACH_PAGEMAP
- || vm_external_state_get(copy_object->existence_map, copy_offset) == VM_EXTERNAL_STATE_ABSENT
-#endif
+ if ((!copy_object->pager_ready)
+ || VM_COMPRESSOR_PAGER_STATE_GET(copy_object, copy_offset) == VM_EXTERNAL_STATE_ABSENT
) {
-
vm_page_lockspin_queues();
- assert(!m->cleaning);
+ assert(!m->vmp_cleaning);
vm_page_activate(copy_m);
vm_page_unlock_queues();
- copy_m->dirty = TRUE;
+ SET_PAGE_DIRTY(copy_m, TRUE);
PAGE_WAKEUP_DONE(copy_m);
- }
- else {
- assert(copy_m->busy == TRUE);
- assert(!m->cleaning);
+ } else {
+ assert(copy_m->vmp_busy == TRUE);
+ assert(!m->vmp_cleaning);
/*
* dirty is protected by the object lock
*/
- copy_m->dirty = TRUE;
+ SET_PAGE_DIRTY(copy_m, TRUE);
/*
* The page is already ready for pageout:
*/
vm_object_lock(object);
}
+
/*
* Because we're pushing a page upward
* in the object tree, we must restart
* wait result]. Can't turn off the page's
* busy bit because we're not done with it.
*/
- if (m->wanted) {
- m->wanted = FALSE;
+ if (m->vmp_wanted) {
+ m->vmp_wanted = FALSE;
thread_wakeup_with_result((event_t) m, THREAD_RESTART);
}
}
copy_object->ref_count--;
assert(copy_object->ref_count > 0);
- VM_OBJ_RES_DECR(copy_object);
+ VM_OBJ_RES_DECR(copy_object);
vm_object_unlock(copy_object);
break;
*result_page = m;
*top_page = first_m;
- XPR(XPR_VM_FAULT,
- "vm_f_page: DONE obj 0x%X, offset 0x%X, m 0x%X, first_m 0x%X\n",
- object, offset, m, first_m, 0);
-
if (m != VM_PAGE_NULL) {
+ assert(VM_PAGE_OBJECT(m) == object);
+
retval = VM_FAULT_SUCCESS;
- if (my_fault == DBG_PAGEIN_FAULT) {
- VM_STAT_INCR(pageins);
- DTRACE_VM2(pgin, int, 1, (uint64_t *), NULL);
- DTRACE_VM2(maj_fault, int, 1, (uint64_t *), NULL);
- current_task()->pageins++;
+ if (my_fault == DBG_PAGEIN_FAULT) {
+ VM_PAGE_COUNT_AS_PAGEIN(m);
- if (m->object->internal) {
- DTRACE_VM2(anonpgin, int, 1, (uint64_t *), NULL);
+ if (object->internal) {
my_fault = DBG_PAGEIND_FAULT;
} else {
- DTRACE_VM2(fspgin, int, 1, (uint64_t *), NULL);
my_fault = DBG_PAGEINV_FAULT;
}
- /*
+ /*
* evaluate access pattern and update state
* vm_fault_deactivate_behind depends on the
* state being up to date
*/
- vm_fault_is_sequential(object, offset, fault_info->behavior);
-
+ vm_fault_is_sequential(object, offset, fault_info->behavior);
+ vm_fault_deactivate_behind(object, offset, fault_info->behavior);
+ } else if (type_of_fault == NULL && my_fault == DBG_CACHE_HIT_FAULT) {
+ /*
+ * we weren't called from vm_fault, so handle the
+ * accounting here for hits in the cache
+ */
+ if (m->vmp_clustered) {
+ VM_PAGE_COUNT_AS_PAGEIN(m);
+ VM_PAGE_CONSUME_CLUSTERED(m);
+ }
+ vm_fault_is_sequential(object, offset, fault_info->behavior);
vm_fault_deactivate_behind(object, offset, fault_info->behavior);
+ } else if (my_fault == DBG_COMPRESSOR_FAULT || my_fault == DBG_COMPRESSOR_SWAPIN_FAULT) {
+ VM_STAT_DECOMPRESSIONS();
+ }
+ if (type_of_fault) {
+ *type_of_fault = my_fault;
}
- if (type_of_fault)
- *type_of_fault = my_fault;
} else {
retval = VM_FAULT_SUCCESS_NO_VM_PAGE;
assert(first_m == VM_PAGE_NULL);
thread_interrupt_level(interruptible_state);
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF001A, (unsigned int) VM_FAULT_SUCCESS, 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF001A, (unsigned int) VM_FAULT_SUCCESS, 0); /* (TEST/DEBUG) */
#endif
return retval;
backoff:
thread_interrupt_level(interruptible_state);
- if (wait_result == THREAD_INTERRUPTED)
- return (VM_FAULT_INTERRUPTED);
- return (VM_FAULT_RETRY);
+ if (wait_result == THREAD_INTERRUPTED) {
+ return VM_FAULT_INTERRUPTED;
+ }
+ return VM_FAULT_RETRY;
-#undef RELEASE_PAGE
+#undef RELEASE_PAGE
}
+extern int panic_on_cs_killed;
+extern int proc_selfpid(void);
+extern char *proc_name_address(void *p);
+unsigned long cs_enter_tainted_rejected = 0;
+unsigned long cs_enter_tainted_accepted = 0;
/*
* CODE SIGNING:
* 3. the page belongs to a code-signed object
* 4. the page has not been validated yet or has been mapped for write.
*/
-#define VM_FAULT_NEED_CS_VALIDATION(pmap, page) \
- ((pmap) != kernel_pmap /*1*/ && \
- !(page)->cs_tainted /*2*/ && \
- (page)->object->code_signed /*3*/ && \
- (!(page)->cs_validated || (page)->wpmapped /*4*/))
-
-
-/*
- * page queue lock must NOT be held
- * m->object must be locked
- *
- * NOTE: m->object could be locked "shared" only if we are called
- * from vm_fault() as part of a soft fault. If so, we must be
- * careful not to modify the VM object in any way that is not
- * legal under a shared lock...
- */
-unsigned long cs_enter_tainted_rejected = 0;
-unsigned long cs_enter_tainted_accepted = 0;
-kern_return_t
-vm_fault_enter(vm_page_t m,
- pmap_t pmap,
- vm_map_offset_t vaddr,
- vm_prot_t prot,
- vm_prot_t fault_type,
- boolean_t wired,
- boolean_t change_wiring,
- boolean_t no_cache,
- boolean_t cs_bypass,
- int *type_of_fault)
+static bool
+vm_fault_cs_need_validation(
+ pmap_t pmap,
+ vm_page_t page,
+ vm_object_t page_obj,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset)
{
- kern_return_t kr, pe_result;
- boolean_t previously_pmapped = m->pmapped;
- boolean_t must_disconnect = 0;
- boolean_t map_is_switched, map_is_switch_protected;
-
- vm_object_lock_assert_held(m->object);
-#if DEBUG
- lck_mtx_assert(&vm_page_queue_lock, LCK_MTX_ASSERT_NOTOWNED);
-#endif /* DEBUG */
-
- if (m->phys_page == vm_page_guard_addr) {
- assert(m->fictitious);
- return KERN_SUCCESS;
+ if (pmap == kernel_pmap) {
+ /* 1 - not user space */
+ return false;
}
-
- if (*type_of_fault == DBG_ZERO_FILL_FAULT) {
-
- vm_object_lock_assert_exclusive(m->object);
-
- } else if ((fault_type & VM_PROT_WRITE) == 0) {
- /*
- * This is not a "write" fault, so we
- * might not have taken the object lock
- * exclusively and we might not be able
- * to update the "wpmapped" bit in
- * vm_fault_enter().
- * Let's just grant read access to
- * the page for now and we'll
- * soft-fault again if we need write
- * access later...
- */
- prot &= ~VM_PROT_WRITE;
- }
- if (m->pmapped == FALSE) {
-
- if ((*type_of_fault == DBG_CACHE_HIT_FAULT) && m->clustered) {
- /*
- * found it in the cache, but this
- * is the first fault-in of the page (m->pmapped == FALSE)
- * so it must have come in as part of
- * a cluster... account 1 pagein against it
- */
- VM_STAT_INCR(pageins);
- DTRACE_VM2(pgin, int, 1, (uint64_t *), NULL);
-
- if (m->object->internal) {
- DTRACE_VM2(anonpgin, int, 1, (uint64_t *), NULL);
- *type_of_fault = DBG_PAGEIND_FAULT;
- } else {
- DTRACE_VM2(fspgin, int, 1, (uint64_t *), NULL);
- *type_of_fault = DBG_PAGEINV_FAULT;
- }
-
- current_task()->pageins++;
+ if (!page_obj->code_signed) {
+ /* 3 - page does not belong to a code-signed object */
+ return false;
+ }
+ if (fault_page_size == PAGE_SIZE) {
+ /* looking at the whole page */
+ assertf(fault_phys_offset == 0,
+ "fault_page_size 0x%llx fault_phys_offset 0x%llx\n",
+ (uint64_t)fault_page_size,
+ (uint64_t)fault_phys_offset);
+ if (page->vmp_cs_tainted == VMP_CS_ALL_TRUE) {
+ /* 2 - page is all tainted */
+ return false;
+ }
+ if (page->vmp_cs_validated == VMP_CS_ALL_TRUE &&
+ !page->vmp_wpmapped) {
+ /* 4 - already fully validated and never mapped writable */
+ return false;
+ }
+ } else {
+ /* looking at a specific sub-page */
+ if (VMP_CS_TAINTED(page, fault_page_size, fault_phys_offset)) {
+ /* 2 - sub-page was already marked as tainted */
+ return false;
+ }
+ if (VMP_CS_VALIDATED(page, fault_page_size, fault_phys_offset) &&
+ !page->vmp_wpmapped) {
+ /* 4 - already validated and never mapped writable */
+ return false;
}
- VM_PAGE_CONSUME_CLUSTERED(m);
-
}
+ /* page needs to be validated */
+ return true;
+}
- if (*type_of_fault != DBG_COW_FAULT) {
- DTRACE_VM2(as_fault, int, 1, (uint64_t *), NULL);
- if (pmap == kernel_pmap) {
- DTRACE_VM2(kernel_asflt, int, 1, (uint64_t *), NULL);
- }
+static bool
+vm_fault_cs_page_immutable(
+ vm_page_t m,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ vm_prot_t prot __unused)
+{
+ if (VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset)
+ /*&& ((prot) & VM_PROT_EXECUTE)*/) {
+ return true;
}
+ return false;
+}
- /* Validate code signature if necessary. */
- if (VM_FAULT_NEED_CS_VALIDATION(pmap, m)) {
- vm_object_lock_assert_exclusive(m->object);
+static bool
+vm_fault_cs_page_nx(
+ vm_page_t m,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset)
+{
+ return VMP_CS_NX(m, fault_page_size, fault_phys_offset);
+}
- if (m->cs_validated) {
+/*
+ * Check if the page being entered into the pmap violates code signing.
+ */
+static kern_return_t
+vm_fault_cs_check_violation(
+ bool cs_bypass,
+ vm_object_t object,
+ vm_page_t m,
+ pmap_t pmap,
+ vm_prot_t prot,
+ vm_prot_t caller_prot,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ vm_object_fault_info_t fault_info,
+ bool map_is_switched,
+ bool map_is_switch_protected,
+ bool *cs_violation)
+{
+#if !PMAP_CS
+#pragma unused(caller_prot)
+#pragma unused(fault_info)
+#endif /* !PMAP_CS */
+ int cs_enforcement_enabled;
+ if (!cs_bypass &&
+ vm_fault_cs_need_validation(pmap, m, object,
+ fault_page_size, fault_phys_offset)) {
+ vm_object_lock_assert_exclusive(object);
+
+ if (VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset)) {
vm_cs_revalidates++;
}
- /* VM map is locked, so 1 ref will remain on VM object -
+ /* VM map is locked, so 1 ref will remain on VM object -
* so no harm if vm_page_validate_cs drops the object lock */
- vm_page_validate_cs(m);
- }
-#define page_immutable(m,prot) ((m)->cs_validated /*&& ((prot) & VM_PROT_EXECUTE)*/)
+ vm_page_validate_cs(m, fault_page_size, fault_phys_offset);
+ }
- map_is_switched = ((pmap != vm_map_pmap(current_task()->map)) &&
- (pmap == vm_map_pmap(current_thread()->map)));
- map_is_switch_protected = current_thread()->map->switch_protect;
-
/* If the map is switched, and is switch-protected, we must protect
- * some pages from being write-faulted: immutable pages because by
+ * some pages from being write-faulted: immutable pages because by
* definition they may not be written, and executable pages because that
* would provide a way to inject unsigned code.
* If the page is immutable, we can simply return. However, we can't
* immediately determine whether a page is executable anywhere. But,
* we can disconnect it everywhere and remove the executable protection
- * from the current map. We do that below right before we do the
+ * from the current map. We do that below right before we do the
* PMAP_ENTER.
*/
- if(!cs_enforcement_disable && map_is_switched &&
- map_is_switch_protected && page_immutable(m, prot) &&
- (prot & VM_PROT_WRITE))
- {
+ if (pmap == kernel_pmap) {
+ /* kernel fault: cs_enforcement does not apply */
+ cs_enforcement_enabled = 0;
+ } else {
+ cs_enforcement_enabled = pmap_get_vm_map_cs_enforced(pmap);
+ }
+
+ if (cs_enforcement_enabled && map_is_switched &&
+ map_is_switch_protected &&
+ vm_fault_cs_page_immutable(m, fault_page_size, fault_phys_offset, prot) &&
+ (prot & VM_PROT_WRITE)) {
+ return KERN_CODESIGN_ERROR;
+ }
+
+ if (cs_enforcement_enabled &&
+ vm_fault_cs_page_nx(m, fault_page_size, fault_phys_offset) &&
+ (prot & VM_PROT_EXECUTE)) {
+ if (cs_debug) {
+ printf("page marked to be NX, not letting it be mapped EXEC\n");
+ }
return KERN_CODESIGN_ERROR;
}
/* A page could be tainted, or pose a risk of being tainted later.
* Check whether the receiving process wants it, and make it feel
* the consequences (that hapens in cs_invalid_page()).
- * For CS Enforcement, two other conditions will
- * cause that page to be tainted as well:
+ * For CS Enforcement, two other conditions will
+ * cause that page to be tainted as well:
* - pmapping an unsigned page executable - this means unsigned code;
* - writeable mapping of a validated page - the content of that page
* can be changed without the kernel noticing, therefore unsigned
* code can be created
*/
- if (m->cs_tainted ||
- (( !cs_enforcement_disable && !cs_bypass ) &&
- (/* The page is unsigned and wants to be executable */
- (!m->cs_validated && (prot & VM_PROT_EXECUTE)) ||
- /* The page should be immutable, but is in danger of being modified
- * This is the case where we want policy from the code directory -
- * is the page immutable or not? For now we have to assume that
- * code pages will be immutable, data pages not.
- * We'll assume a page is a code page if it has a code directory
- * and we fault for execution.
- * That is good enough since if we faulted the code page for
- * writing in another map before, it is wpmapped; if we fault
- * it for writing in this map later it will also be faulted for executing
- * at the same time; and if we fault for writing in another map
- * later, we will disconnect it from this pmap so we'll notice
- * the change.
- */
- (page_immutable(m, prot) && ((prot & VM_PROT_WRITE) || m->wpmapped))
- ))
- )
- {
- /* We will have a tainted page. Have to handle the special case
- * of a switched map now. If the map is not switched, standard
- * procedure applies - call cs_invalid_page().
- * If the map is switched, the real owner is invalid already.
- * There is no point in invalidating the switching process since
- * it will not be executing from the map. So we don't call
- * cs_invalid_page() in that case. */
- boolean_t reject_page;
- if(map_is_switched) {
- assert(pmap==vm_map_pmap(current_thread()->map));
- assert(!(prot & VM_PROT_WRITE) || (map_is_switch_protected == FALSE));
- reject_page = FALSE;
- } else {
- reject_page = cs_invalid_page((addr64_t) vaddr);
- }
-
- if (reject_page) {
- /* reject the tainted page: abort the page fault */
- kr = KERN_CODESIGN_ERROR;
- cs_enter_tainted_rejected++;
- } else {
- /* proceed with the tainted page */
- kr = KERN_SUCCESS;
- /* Page might have been tainted before or not; now it
- * definitively is. If the page wasn't tainted, we must
- * disconnect it from all pmaps later. */
- must_disconnect = !m->cs_tainted;
- m->cs_tainted = TRUE;
- cs_enter_tainted_accepted++;
- }
- if (cs_debug || kr != KERN_SUCCESS) {
- printf("CODESIGNING: vm_fault_enter(0x%llx): "
- "page %p obj %p off 0x%llx *** INVALID PAGE ***\n",
- (long long)vaddr, m, m->object, m->offset);
- }
-
+ if (cs_bypass) {
+ /* code-signing is bypassed */
+ *cs_violation = FALSE;
+ } else if (VMP_CS_TAINTED(m, fault_page_size, fault_phys_offset)) {
+ /* tainted page */
+ *cs_violation = TRUE;
+ } else if (!cs_enforcement_enabled) {
+ /* no further code-signing enforcement */
+ *cs_violation = FALSE;
+ } else if (vm_fault_cs_page_immutable(m, fault_page_size, fault_phys_offset, prot) &&
+ ((prot & VM_PROT_WRITE) ||
+ m->vmp_wpmapped)) {
+ /*
+ * The page should be immutable, but is in danger of being
+ * modified.
+ * This is the case where we want policy from the code
+ * directory - is the page immutable or not? For now we have
+ * to assume that code pages will be immutable, data pages not.
+ * We'll assume a page is a code page if it has a code directory
+ * and we fault for execution.
+ * That is good enough since if we faulted the code page for
+ * writing in another map before, it is wpmapped; if we fault
+ * it for writing in this map later it will also be faulted for
+ * executing at the same time; and if we fault for writing in
+ * another map later, we will disconnect it from this pmap so
+ * we'll notice the change.
+ */
+ *cs_violation = TRUE;
+ } else if (!VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset) &&
+ (prot & VM_PROT_EXECUTE)
+ ) {
+ *cs_violation = TRUE;
} else {
- /* proceed with the valid page */
- kr = KERN_SUCCESS;
+ *cs_violation = FALSE;
}
+ return KERN_SUCCESS;
+}
- /* If we have a KERN_SUCCESS from the previous checks, we either have
- * a good page, or a tainted page that has been accepted by the process.
- * In both cases the page will be entered into the pmap.
- * If the page is writeable, we need to disconnect it from other pmaps
- * now so those processes can take note.
+/*
+ * Handles a code signing violation by either rejecting the page or forcing a disconnect.
+ * @param must_disconnect This value will be set to true if the caller must disconnect
+ * this page.
+ * @return If this function does not return KERN_SUCCESS, the caller must abort the page fault.
+ */
+static kern_return_t
+vm_fault_cs_handle_violation(
+ vm_object_t object,
+ vm_page_t m,
+ pmap_t pmap,
+ vm_prot_t prot,
+ vm_map_offset_t vaddr,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ bool map_is_switched,
+ bool map_is_switch_protected,
+ bool *must_disconnect)
+{
+#if !MACH_ASSERT
+#pragma unused(pmap)
+#pragma unused(map_is_switch_protected)
+#endif /* !MACH_ASSERT */
+ /*
+ * We will have a tainted page. Have to handle the special case
+ * of a switched map now. If the map is not switched, standard
+ * procedure applies - call cs_invalid_page().
+ * If the map is switched, the real owner is invalid already.
+ * There is no point in invalidating the switching process since
+ * it will not be executing from the map. So we don't call
+ * cs_invalid_page() in that case.
*/
- if (kr == KERN_SUCCESS) {
- /*
- * NOTE: we may only hold the vm_object lock SHARED
- * at this point, but the update of pmapped is ok
- * since this is the ONLY bit updated behind the SHARED
- * lock... however, we need to figure out how to do an atomic
- * update on a bit field to make this less fragile... right
- * now I don't know how to coerce 'C' to give me the offset info
- * that's needed for an AtomicCompareAndSwap
- */
- m->pmapped = TRUE;
- if(vm_page_is_slideable(m)) {
- boolean_t was_busy = m->busy;
- m->busy = TRUE;
- kr = vm_page_slide(m, 0);
- assert(m->busy);
- if(!was_busy) {
- PAGE_WAKEUP_DONE(m);
- }
- if (kr != KERN_SUCCESS) {
- /*
- * This page has not been slid correctly,
- * do not do the pmap_enter() !
- * Let vm_fault_enter() return the error
- * so the caller can fail the fault.
- */
- goto after_the_pmap_enter;
- }
+ boolean_t reject_page, cs_killed;
+ kern_return_t kr;
+ if (map_is_switched) {
+ assert(pmap == vm_map_pmap(current_thread()->map));
+ assert(!(prot & VM_PROT_WRITE) || (map_is_switch_protected == FALSE));
+ reject_page = FALSE;
+ } else {
+ if (cs_debug > 5) {
+ printf("vm_fault: signed: %s validate: %s tainted: %s wpmapped: %s prot: 0x%x\n",
+ object->code_signed ? "yes" : "no",
+ VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset) ? "yes" : "no",
+ VMP_CS_TAINTED(m, fault_page_size, fault_phys_offset) ? "yes" : "no",
+ m->vmp_wpmapped ? "yes" : "no",
+ (int)prot);
}
+ reject_page = cs_invalid_page((addr64_t) vaddr, &cs_killed);
+ }
- if (fault_type & VM_PROT_WRITE) {
-
- if (m->wpmapped == FALSE) {
- vm_object_lock_assert_exclusive(m->object);
+ if (reject_page) {
+ /* reject the invalid page: abort the page fault */
+ int pid;
+ const char *procname;
+ task_t task;
+ vm_object_t file_object, shadow;
+ vm_object_offset_t file_offset;
+ char *pathname, *filename;
+ vm_size_t pathname_len, filename_len;
+ boolean_t truncated_path;
+#define __PATH_MAX 1024
+ struct timespec mtime, cs_mtime;
+ int shadow_depth;
+ os_reason_t codesigning_exit_reason = OS_REASON_NULL;
+
+ kr = KERN_CODESIGN_ERROR;
+ cs_enter_tainted_rejected++;
+
+ /* get process name and pid */
+ procname = "?";
+ task = current_task();
+ pid = proc_selfpid();
+ if (task->bsd_info != NULL) {
+ procname = proc_name_address(task->bsd_info);
+ }
- m->wpmapped = TRUE;
- }
- if (must_disconnect) {
- /*
- * We can only get here
- * because of the CSE logic
- */
- assert(cs_enforcement_disable == FALSE);
- pmap_disconnect(m->phys_page);
- /*
- * If we are faulting for a write, we can clear
- * the execute bit - that will ensure the page is
- * checked again before being executable, which
- * protects against a map switch.
- * This only happens the first time the page
- * gets tainted, so we won't get stuck here
- * to make an already writeable page executable.
- */
- if (!cs_bypass){
- prot &= ~VM_PROT_EXECUTE;
- }
+ /* get file's VM object */
+ file_object = object;
+ file_offset = m->vmp_offset;
+ for (shadow = file_object->shadow,
+ shadow_depth = 0;
+ shadow != VM_OBJECT_NULL;
+ shadow = file_object->shadow,
+ shadow_depth++) {
+ vm_object_lock_shared(shadow);
+ if (file_object != object) {
+ vm_object_unlock(file_object);
}
+ file_offset += file_object->vo_shadow_offset;
+ file_object = shadow;
}
- /* Prevent a deadlock by not
- * holding the object lock if we need to wait for a page in
- * pmap_enter() - <rdar://problem/7138958> */
- PMAP_ENTER_OPTIONS(pmap, vaddr, m, prot, 0,
- wired, PMAP_OPTIONS_NOWAIT, pe_result);
-
- if(pe_result == KERN_RESOURCE_SHORTAGE) {
- /* The nonblocking version of pmap_enter did not succeed.
- * Use the blocking version instead. Requires marking
- * the page busy and unlocking the object */
- boolean_t was_busy = m->busy;
- m->busy = TRUE;
- vm_object_unlock(m->object);
-
- PMAP_ENTER(pmap, vaddr, m, prot, 0, wired);
-
- /* Take the object lock again. */
- vm_object_lock(m->object);
-
- /* If the page was busy, someone else will wake it up.
- * Otherwise, we have to do it now. */
- assert(m->busy);
- if(!was_busy) {
- PAGE_WAKEUP_DONE(m);
+ mtime.tv_sec = 0;
+ mtime.tv_nsec = 0;
+ cs_mtime.tv_sec = 0;
+ cs_mtime.tv_nsec = 0;
+
+ /* get file's pathname and/or filename */
+ pathname = NULL;
+ filename = NULL;
+ pathname_len = 0;
+ filename_len = 0;
+ truncated_path = FALSE;
+ /* no pager -> no file -> no pathname, use "<nil>" in that case */
+ if (file_object->pager != NULL) {
+ pathname = kheap_alloc(KHEAP_TEMP, __PATH_MAX * 2, Z_WAITOK);
+ if (pathname) {
+ pathname[0] = '\0';
+ pathname_len = __PATH_MAX;
+ filename = pathname + pathname_len;
+ filename_len = __PATH_MAX;
+
+ if (vnode_pager_get_object_name(file_object->pager,
+ pathname,
+ pathname_len,
+ filename,
+ filename_len,
+ &truncated_path) == KERN_SUCCESS) {
+ /* safety first... */
+ pathname[__PATH_MAX - 1] = '\0';
+ filename[__PATH_MAX - 1] = '\0';
+
+ vnode_pager_get_object_mtime(file_object->pager,
+ &mtime,
+ &cs_mtime);
+ } else {
+ kheap_free(KHEAP_TEMP, pathname, __PATH_MAX * 2);
+ pathname = NULL;
+ filename = NULL;
+ pathname_len = 0;
+ filename_len = 0;
+ truncated_path = FALSE;
+ }
}
- vm_pmap_enter_blocked++;
}
+ printf("CODE SIGNING: process %d[%s]: "
+ "rejecting invalid page at address 0x%llx "
+ "from offset 0x%llx in file \"%s%s%s\" "
+ "(cs_mtime:%lu.%ld %s mtime:%lu.%ld) "
+ "(signed:%d validated:%d tainted:%d nx:%d "
+ "wpmapped:%d dirty:%d depth:%d)\n",
+ pid, procname, (addr64_t) vaddr,
+ file_offset,
+ (pathname ? pathname : "<nil>"),
+ (truncated_path ? "/.../" : ""),
+ (truncated_path ? filename : ""),
+ cs_mtime.tv_sec, cs_mtime.tv_nsec,
+ ((cs_mtime.tv_sec == mtime.tv_sec &&
+ cs_mtime.tv_nsec == mtime.tv_nsec)
+ ? "=="
+ : "!="),
+ mtime.tv_sec, mtime.tv_nsec,
+ object->code_signed,
+ VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset),
+ VMP_CS_TAINTED(m, fault_page_size, fault_phys_offset),
+ VMP_CS_NX(m, fault_page_size, fault_phys_offset),
+ m->vmp_wpmapped,
+ m->vmp_dirty,
+ shadow_depth);
+
+ /*
+ * We currently only generate an exit reason if cs_invalid_page directly killed a process. If cs_invalid_page
+ * did not kill the process (more the case on desktop), vm_fault_enter will not satisfy the fault and whether the
+ * process dies is dependent on whether there is a signal handler registered for SIGSEGV and how that handler
+ * will deal with the segmentation fault.
+ */
+ if (cs_killed) {
+ KERNEL_DEBUG_CONSTANT(BSDDBG_CODE(DBG_BSD_PROC, BSD_PROC_EXITREASON_CREATE) | DBG_FUNC_NONE,
+ pid, OS_REASON_CODESIGNING, CODESIGNING_EXIT_REASON_INVALID_PAGE, 0, 0);
+
+ codesigning_exit_reason = os_reason_create(OS_REASON_CODESIGNING, CODESIGNING_EXIT_REASON_INVALID_PAGE);
+ if (codesigning_exit_reason == NULL) {
+ printf("vm_fault_enter: failed to allocate codesigning exit reason\n");
+ } else {
+ mach_vm_address_t data_addr = 0;
+ struct codesigning_exit_reason_info *ceri = NULL;
+ uint32_t reason_buffer_size_estimate = kcdata_estimate_required_buffer_size(1, sizeof(*ceri));
+
+ if (os_reason_alloc_buffer_noblock(codesigning_exit_reason, reason_buffer_size_estimate)) {
+ printf("vm_fault_enter: failed to allocate buffer for codesigning exit reason\n");
+ } else {
+ if (KERN_SUCCESS == kcdata_get_memory_addr(&codesigning_exit_reason->osr_kcd_descriptor,
+ EXIT_REASON_CODESIGNING_INFO, sizeof(*ceri), &data_addr)) {
+ ceri = (struct codesigning_exit_reason_info *)data_addr;
+ static_assert(__PATH_MAX == sizeof(ceri->ceri_pathname));
+
+ ceri->ceri_virt_addr = vaddr;
+ ceri->ceri_file_offset = file_offset;
+ if (pathname) {
+ strncpy((char *)&ceri->ceri_pathname, pathname, sizeof(ceri->ceri_pathname));
+ } else {
+ ceri->ceri_pathname[0] = '\0';
+ }
+ if (filename) {
+ strncpy((char *)&ceri->ceri_filename, filename, sizeof(ceri->ceri_filename));
+ } else {
+ ceri->ceri_filename[0] = '\0';
+ }
+ ceri->ceri_path_truncated = (truncated_path ? 1 : 0);
+ ceri->ceri_codesig_modtime_secs = cs_mtime.tv_sec;
+ ceri->ceri_codesig_modtime_nsecs = cs_mtime.tv_nsec;
+ ceri->ceri_page_modtime_secs = mtime.tv_sec;
+ ceri->ceri_page_modtime_nsecs = mtime.tv_nsec;
+ ceri->ceri_object_codesigned = (object->code_signed);
+ ceri->ceri_page_codesig_validated = VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset);
+ ceri->ceri_page_codesig_tainted = VMP_CS_TAINTED(m, fault_page_size, fault_phys_offset);
+ ceri->ceri_page_codesig_nx = VMP_CS_NX(m, fault_page_size, fault_phys_offset);
+ ceri->ceri_page_wpmapped = (m->vmp_wpmapped);
+ ceri->ceri_page_slid = 0;
+ ceri->ceri_page_dirty = (m->vmp_dirty);
+ ceri->ceri_page_shadow_depth = shadow_depth;
+ } else {
+#if DEBUG || DEVELOPMENT
+ panic("vm_fault_enter: failed to allocate kcdata for codesigning exit reason");
+#else
+ printf("vm_fault_enter: failed to allocate kcdata for codesigning exit reason\n");
+#endif /* DEBUG || DEVELOPMENT */
+ /* Free the buffer */
+ os_reason_alloc_buffer_noblock(codesigning_exit_reason, 0);
+ }
+ }
+ }
+
+ set_thread_exit_reason(current_thread(), codesigning_exit_reason, FALSE);
+ }
+ if (panic_on_cs_killed &&
+ object->object_is_shared_cache) {
+ char *tainted_contents;
+ vm_map_offset_t src_vaddr;
+ src_vaddr = (vm_map_offset_t) phystokv((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(m) << PAGE_SHIFT);
+ tainted_contents = kalloc(PAGE_SIZE);
+ bcopy((const char *)src_vaddr, tainted_contents, PAGE_SIZE);
+ printf("CODE SIGNING: tainted page %p phys 0x%x phystokv 0x%llx copied to %p\n", m, VM_PAGE_GET_PHYS_PAGE(m), (uint64_t)src_vaddr, tainted_contents);
+ panic("CODE SIGNING: process %d[%s]: "
+ "rejecting invalid page (phys#0x%x) at address 0x%llx "
+ "from offset 0x%llx in file \"%s%s%s\" "
+ "(cs_mtime:%lu.%ld %s mtime:%lu.%ld) "
+ "(signed:%d validated:%d tainted:%d nx:%d"
+ "wpmapped:%d dirty:%d depth:%d)\n",
+ pid, procname,
+ VM_PAGE_GET_PHYS_PAGE(m),
+ (addr64_t) vaddr,
+ file_offset,
+ (pathname ? pathname : "<nil>"),
+ (truncated_path ? "/.../" : ""),
+ (truncated_path ? filename : ""),
+ cs_mtime.tv_sec, cs_mtime.tv_nsec,
+ ((cs_mtime.tv_sec == mtime.tv_sec &&
+ cs_mtime.tv_nsec == mtime.tv_nsec)
+ ? "=="
+ : "!="),
+ mtime.tv_sec, mtime.tv_nsec,
+ object->code_signed,
+ VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset),
+ VMP_CS_TAINTED(m, fault_page_size, fault_phys_offset),
+ VMP_CS_NX(m, fault_page_size, fault_phys_offset),
+ m->vmp_wpmapped,
+ m->vmp_dirty,
+ shadow_depth);
+ }
+
+ if (file_object != object) {
+ vm_object_unlock(file_object);
+ }
+ if (pathname_len != 0) {
+ kheap_free(KHEAP_TEMP, pathname, __PATH_MAX * 2);
+ pathname = NULL;
+ filename = NULL;
+ }
+ } else {
+ /* proceed with the invalid page */
+ kr = KERN_SUCCESS;
+ if (!VMP_CS_VALIDATED(m, fault_page_size, fault_phys_offset) &&
+ !object->code_signed) {
+ /*
+ * This page has not been (fully) validated but
+ * does not belong to a code-signed object
+ * so it should not be forcefully considered
+ * as tainted.
+ * We're just concerned about it here because
+ * we've been asked to "execute" it but that
+ * does not mean that it should cause other
+ * accesses to fail.
+ * This happens when a debugger sets a
+ * breakpoint and we then execute code in
+ * that page. Marking the page as "tainted"
+ * would cause any inspection tool ("leaks",
+ * "vmmap", "CrashReporter", ...) to get killed
+ * due to code-signing violation on that page,
+ * even though they're just reading it and not
+ * executing from it.
+ */
+ } else {
+ /*
+ * Page might have been tainted before or not;
+ * now it definitively is. If the page wasn't
+ * tainted, we must disconnect it from all
+ * pmaps later, to force existing mappings
+ * through that code path for re-consideration
+ * of the validity of that page.
+ */
+ if (!VMP_CS_TAINTED(m, fault_page_size, fault_phys_offset)) {
+ *must_disconnect = TRUE;
+ VMP_CS_SET_TAINTED(m, fault_page_size, fault_phys_offset, TRUE);
+ }
+ }
+ cs_enter_tainted_accepted++;
+ }
+ if (kr != KERN_SUCCESS) {
+ if (cs_debug) {
+ printf("CODESIGNING: vm_fault_enter(0x%llx): "
+ "*** INVALID PAGE ***\n",
+ (long long)vaddr);
+ }
+#if !SECURE_KERNEL
+ if (cs_enforcement_panic) {
+ panic("CODESIGNING: panicking on invalid page\n");
+ }
+#endif
}
+ return kr;
+}
-after_the_pmap_enter:
- /*
- * Hold queues lock to manipulate
- * the page queues. Change wiring
- * case is obvious.
- */
- if (change_wiring) {
- vm_page_lockspin_queues();
+/*
+ * Check that the code signature is valid for the given page being inserted into
+ * the pmap.
+ *
+ * @param must_disconnect This value will be set to true if the caller must disconnect
+ * this page.
+ * @return If this function does not return KERN_SUCCESS, the caller must abort the page fault.
+ */
+static kern_return_t
+vm_fault_validate_cs(
+ bool cs_bypass,
+ vm_object_t object,
+ vm_page_t m,
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ vm_prot_t prot,
+ vm_prot_t caller_prot,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ vm_object_fault_info_t fault_info,
+ bool *must_disconnect)
+{
+ bool map_is_switched, map_is_switch_protected, cs_violation;
+ kern_return_t kr;
+ /* Validate code signature if necessary. */
+ map_is_switched = ((pmap != vm_map_pmap(current_task()->map)) &&
+ (pmap == vm_map_pmap(current_thread()->map)));
+ map_is_switch_protected = current_thread()->map->switch_protect;
+ kr = vm_fault_cs_check_violation(cs_bypass, object, m, pmap,
+ prot, caller_prot, fault_page_size, fault_phys_offset, fault_info,
+ map_is_switched, map_is_switch_protected, &cs_violation);
+ if (kr != KERN_SUCCESS) {
+ return kr;
+ }
+ if (cs_violation) {
+ kr = vm_fault_cs_handle_violation(object, m, pmap, prot, vaddr,
+ fault_page_size, fault_phys_offset,
+ map_is_switched, map_is_switch_protected, must_disconnect);
+ }
+ return kr;
+}
+
+/*
+ * Enqueue the page on the appropriate paging queue.
+ */
+static void
+vm_fault_enqueue_page(
+ vm_object_t object,
+ vm_page_t m,
+ bool wired,
+ bool change_wiring,
+ vm_tag_t wire_tag,
+ bool no_cache,
+ int *type_of_fault,
+ kern_return_t kr)
+{
+ assert((m->vmp_q_state == VM_PAGE_USED_BY_COMPRESSOR) || object != compressor_object);
+ boolean_t page_queues_locked = FALSE;
+ boolean_t previously_pmapped = m->vmp_pmapped;
+#define __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED() \
+MACRO_BEGIN \
+ if (! page_queues_locked) { \
+ page_queues_locked = TRUE; \
+ vm_page_lockspin_queues(); \
+ } \
+MACRO_END
+#define __VM_PAGE_UNLOCK_QUEUES_IF_NEEDED() \
+MACRO_BEGIN \
+ if (page_queues_locked) { \
+ page_queues_locked = FALSE; \
+ vm_page_unlock_queues(); \
+ } \
+MACRO_END
+
+#if CONFIG_BACKGROUND_QUEUE
+ vm_page_update_background_state(m);
+#endif
+ if (m->vmp_q_state == VM_PAGE_USED_BY_COMPRESSOR) {
+ /*
+ * Compressor pages are neither wired
+ * nor pageable and should never change.
+ */
+ assert(object == compressor_object);
+ } else if (change_wiring) {
+ __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED();
if (wired) {
if (kr == KERN_SUCCESS) {
- vm_page_wire(m);
+ vm_page_wire(m, wire_tag, TRUE);
}
} else {
- vm_page_unwire(m, TRUE);
+ vm_page_unwire(m, TRUE);
}
- vm_page_unlock_queues();
-
+ /* we keep the page queues lock, if we need it later */
} else {
- if (kr != KERN_SUCCESS) {
- vm_page_lockspin_queues();
- vm_page_deactivate(m);
- vm_page_unlock_queues();
- } else {
- if (((!m->active && !m->inactive) || no_cache) && !VM_PAGE_WIRED(m) && !m->throttled) {
+ if (object->internal == TRUE) {
+ /*
+ * don't allow anonymous pages on
+ * the speculative queues
+ */
+ no_cache = FALSE;
+ }
+ if (kr != KERN_SUCCESS) {
+ __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED();
+ vm_page_deactivate(m);
+ /* we keep the page queues lock, if we need it later */
+ } else if (((m->vmp_q_state == VM_PAGE_NOT_ON_Q) ||
+ (m->vmp_q_state == VM_PAGE_ON_SPECULATIVE_Q) ||
+ (m->vmp_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) ||
+ ((m->vmp_q_state != VM_PAGE_ON_THROTTLED_Q) && no_cache)) &&
+ !VM_PAGE_WIRED(m)) {
+ if (vm_page_local_q &&
+ (*type_of_fault == DBG_COW_FAULT ||
+ *type_of_fault == DBG_ZERO_FILL_FAULT)) {
+ struct vpl *lq;
+ uint32_t lid;
+
+ assert(m->vmp_q_state == VM_PAGE_NOT_ON_Q);
+
+ __VM_PAGE_UNLOCK_QUEUES_IF_NEEDED();
+ vm_object_lock_assert_exclusive(object);
- if ( vm_page_local_q && !no_cache && (*type_of_fault == DBG_COW_FAULT || *type_of_fault == DBG_ZERO_FILL_FAULT) ) {
- struct vpl *lq;
- uint32_t lid;
+ /*
+ * we got a local queue to stuff this
+ * new page on...
+ * its safe to manipulate local and
+ * local_id at this point since we're
+ * behind an exclusive object lock and
+ * the page is not on any global queue.
+ *
+ * we'll use the current cpu number to
+ * select the queue note that we don't
+ * need to disable preemption... we're
+ * going to be behind the local queue's
+ * lock to do the real work
+ */
+ lid = cpu_number();
+
+ lq = zpercpu_get_cpu(vm_page_local_q, lid);
+ VPL_LOCK(&lq->vpl_lock);
+
+ vm_page_check_pageable_safe(m);
+ vm_page_queue_enter(&lq->vpl_queue, m, vmp_pageq);
+ m->vmp_q_state = VM_PAGE_ON_ACTIVE_LOCAL_Q;
+ m->vmp_local_id = lid;
+ lq->vpl_count++;
+
+ if (object->internal) {
+ lq->vpl_internal_count++;
+ } else {
+ lq->vpl_external_count++;
+ }
+
+ VPL_UNLOCK(&lq->vpl_lock);
+
+ if (lq->vpl_count > vm_page_local_q_soft_limit) {
/*
- * we got a local queue to stuff this new page on...
- * its safe to manipulate local and local_id at this point
- * since we're behind an exclusive object lock and the
- * page is not on any global queue.
- *
- * we'll use the current cpu number to select the queue
- * note that we don't need to disable preemption... we're
- * going to behind the local queue's lock to do the real
- * work
+ * we're beyond the soft limit
+ * for the local queue
+ * vm_page_reactivate_local will
+ * 'try' to take the global page
+ * queue lock... if it can't
+ * that's ok... we'll let the
+ * queue continue to grow up
+ * to the hard limit... at that
+ * point we'll wait for the
+ * lock... once we've got the
+ * lock, we'll transfer all of
+ * the pages from the local
+ * queue to the global active
+ * queue
*/
- lid = cpu_number();
-
- lq = &vm_page_local_q[lid].vpl_un.vpl;
+ vm_page_reactivate_local(lid, FALSE, FALSE);
+ }
+ } else {
+ __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED();
- VPL_LOCK(&lq->vpl_lock);
+ /*
+ * test again now that we hold the
+ * page queue lock
+ */
+ if (!VM_PAGE_WIRED(m)) {
+ if (m->vmp_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) {
+ vm_page_queues_remove(m, FALSE);
- queue_enter(&lq->vpl_queue, m, vm_page_t, pageq);
- m->local = TRUE;
- m->local_id = lid;
- lq->vpl_count++;
-
- VPL_UNLOCK(&lq->vpl_lock);
+ VM_PAGEOUT_DEBUG(vm_pageout_cleaned_reactivated, 1);
+ VM_PAGEOUT_DEBUG(vm_pageout_cleaned_fault_reactivated, 1);
+ }
- if (lq->vpl_count > vm_page_local_q_soft_limit) {
+ if (!VM_PAGE_ACTIVE_OR_INACTIVE(m) ||
+ no_cache) {
/*
- * we're beyond the soft limit for the local queue
- * vm_page_reactivate_local will 'try' to take
- * the global page queue lock... if it can't that's
- * ok... we'll let the queue continue to grow up
- * to the hard limit... at that point we'll wait
- * for the lock... once we've got the lock, we'll
- * transfer all of the pages from the local queue
- * to the global active queue
+ * If this is a no_cache mapping
+ * and the page has never been
+ * mapped before or was
+ * previously a no_cache page,
+ * then we want to leave pages
+ * in the speculative state so
+ * that they can be readily
+ * recycled if free memory runs
+ * low. Otherwise the page is
+ * activated as normal.
*/
- vm_page_reactivate_local(lid, FALSE, FALSE);
+
+ if (no_cache &&
+ (!previously_pmapped ||
+ m->vmp_no_cache)) {
+ m->vmp_no_cache = TRUE;
+
+ if (m->vmp_q_state != VM_PAGE_ON_SPECULATIVE_Q) {
+ vm_page_speculate(m, FALSE);
+ }
+ } else if (!VM_PAGE_ACTIVE_OR_INACTIVE(m)) {
+ vm_page_activate(m);
+ }
}
- return kr;
}
+ /* we keep the page queues lock, if we need it later */
+ }
+ }
+ }
+ /* we're done with the page queues lock, if we ever took it */
+ __VM_PAGE_UNLOCK_QUEUES_IF_NEEDED();
+}
+
+/*
+ * Sets the pmmpped, xpmapped, and wpmapped bits on the vm_page_t and updates accounting.
+ * @return true if the page needs to be sync'ed via pmap_sync-page_data_physo
+ * before being inserted into the pmap.
+ */
+static bool
+vm_fault_enter_set_mapped(
+ vm_object_t object,
+ vm_page_t m,
+ vm_prot_t prot,
+ vm_prot_t fault_type)
+{
+ bool page_needs_sync = false;
+ /*
+ * NOTE: we may only hold the vm_object lock SHARED
+ * at this point, so we need the phys_page lock to
+ * properly serialize updating the pmapped and
+ * xpmapped bits
+ */
+ if ((prot & VM_PROT_EXECUTE) && !m->vmp_xpmapped) {
+ ppnum_t phys_page = VM_PAGE_GET_PHYS_PAGE(m);
+
+ pmap_lock_phys_page(phys_page);
+ m->vmp_pmapped = TRUE;
+
+ if (!m->vmp_xpmapped) {
+ m->vmp_xpmapped = TRUE;
+
+ pmap_unlock_phys_page(phys_page);
+
+ if (!object->internal) {
+ OSAddAtomic(1, &vm_page_xpmapped_external_count);
+ }
- vm_page_lockspin_queues();
+#if defined(__arm__) || defined(__arm64__)
+ page_needs_sync = true;
+#else
+ if (object->internal &&
+ object->pager != NULL) {
/*
- * test again now that we hold the page queue lock
+ * This page could have been
+ * uncompressed by the
+ * compressor pager and its
+ * contents might be only in
+ * the data cache.
+ * Since it's being mapped for
+ * "execute" for the fist time,
+ * make sure the icache is in
+ * sync.
*/
- if (((!m->active && !m->inactive) || no_cache) && !VM_PAGE_WIRED(m)) {
+ assert(VM_CONFIG_COMPRESSOR_IS_PRESENT);
+ page_needs_sync = true;
+ }
+#endif
+ } else {
+ pmap_unlock_phys_page(phys_page);
+ }
+ } else {
+ if (m->vmp_pmapped == FALSE) {
+ ppnum_t phys_page = VM_PAGE_GET_PHYS_PAGE(m);
- /*
- * If this is a no_cache mapping and the page has never been
- * mapped before or was previously a no_cache page, then we
- * want to leave pages in the speculative state so that they
- * can be readily recycled if free memory runs low. Otherwise
- * the page is activated as normal.
- */
+ pmap_lock_phys_page(phys_page);
+ m->vmp_pmapped = TRUE;
+ pmap_unlock_phys_page(phys_page);
+ }
+ }
+
+ if (fault_type & VM_PROT_WRITE) {
+ if (m->vmp_wpmapped == FALSE) {
+ vm_object_lock_assert_exclusive(object);
+ if (!object->internal && object->pager) {
+ task_update_logical_writes(current_task(), PAGE_SIZE, TASK_WRITE_DEFERRED, vnode_pager_lookup_vnode(object->pager));
+ }
+ m->vmp_wpmapped = TRUE;
+ }
+ }
+ return page_needs_sync;
+}
+
+/*
+ * Try to enter the given page into the pmap.
+ * Will retry without execute permission iff PMAP_CS is enabled and we encounter
+ * a codesigning failure on a non-execute fault.
+ */
+static kern_return_t
+vm_fault_attempt_pmap_enter(
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ vm_page_t m,
+ vm_prot_t *prot,
+ vm_prot_t caller_prot,
+ vm_prot_t fault_type,
+ bool wired,
+ int pmap_options)
+{
+#if !PMAP_CS
+#pragma unused(caller_prot)
+#endif /* !PMAP_CS */
+ kern_return_t kr;
+ if (fault_page_size != PAGE_SIZE) {
+ DEBUG4K_FAULT("pmap %p va 0x%llx pa 0x%llx (0x%llx+0x%llx) prot 0x%x fault_type 0x%x\n", pmap, (uint64_t)vaddr, (uint64_t)((((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(m)) << PAGE_SHIFT) + fault_phys_offset), (uint64_t)(((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(m)) << PAGE_SHIFT), (uint64_t)fault_phys_offset, *prot, fault_type);
+ assertf((!(fault_phys_offset & FOURK_PAGE_MASK) &&
+ fault_phys_offset < PAGE_SIZE),
+ "0x%llx\n", (uint64_t)fault_phys_offset);
+ } else {
+ assertf(fault_phys_offset == 0,
+ "0x%llx\n", (uint64_t)fault_phys_offset);
+ }
+
+ PMAP_ENTER_OPTIONS(pmap, vaddr,
+ fault_phys_offset,
+ m, *prot, fault_type, 0,
+ wired,
+ pmap_options,
+ kr);
+ return kr;
+}
+
+/*
+ * Enter the given page into the pmap.
+ * The map must be locked shared.
+ * The vm object must NOT be locked.
+ *
+ * @param need_retry if not null, avoid making a (potentially) blocking call into
+ * the pmap layer. When such a call would be necessary, return true in this boolean instead.
+ */
+static kern_return_t
+vm_fault_pmap_enter(
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ vm_page_t m,
+ vm_prot_t *prot,
+ vm_prot_t caller_prot,
+ vm_prot_t fault_type,
+ bool wired,
+ int pmap_options,
+ boolean_t *need_retry)
+{
+ kern_return_t kr;
+ if (need_retry != NULL) {
+ /*
+ * Although we don't hold a lock on this object, we hold a lock
+ * on the top object in the chain. To prevent a deadlock, we
+ * can't allow the pmap layer to block.
+ */
+ pmap_options |= PMAP_OPTIONS_NOWAIT;
+ }
+ kr = vm_fault_attempt_pmap_enter(pmap, vaddr,
+ fault_page_size, fault_phys_offset,
+ m, prot, caller_prot, fault_type, wired, pmap_options);
+ if (kr == KERN_RESOURCE_SHORTAGE) {
+ if (need_retry) {
+ /*
+ * There's nothing we can do here since we hold the
+ * lock on the top object in the chain. The caller
+ * will need to deal with this by dropping that lock and retrying.
+ */
+ *need_retry = TRUE;
+ vm_pmap_enter_retried++;
+ }
+ }
+ return kr;
+}
+
+/*
+ * Enter the given page into the pmap.
+ * The vm map must be locked shared.
+ * The vm object must be locked exclusive, unless this is a soft fault.
+ * For a soft fault, the object must be locked shared or exclusive.
+ *
+ * @param need_retry if not null, avoid making a (potentially) blocking call into
+ * the pmap layer. When such a call would be necessary, return true in this boolean instead.
+ */
+static kern_return_t
+vm_fault_pmap_enter_with_object_lock(
+ vm_object_t object,
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ vm_page_t m,
+ vm_prot_t *prot,
+ vm_prot_t caller_prot,
+ vm_prot_t fault_type,
+ bool wired,
+ int pmap_options,
+ boolean_t *need_retry)
+{
+ kern_return_t kr;
+ /*
+ * Prevent a deadlock by not
+ * holding the object lock if we need to wait for a page in
+ * pmap_enter() - <rdar://problem/7138958>
+ */
+ kr = vm_fault_attempt_pmap_enter(pmap, vaddr,
+ fault_page_size, fault_phys_offset,
+ m, prot, caller_prot, fault_type, wired, pmap_options | PMAP_OPTIONS_NOWAIT);
+#if __x86_64__
+ if (kr == KERN_INVALID_ARGUMENT &&
+ pmap == PMAP_NULL &&
+ wired) {
+ /*
+ * Wiring a page in a pmap-less VM map:
+ * VMware's "vmmon" kernel extension does this
+ * to grab pages.
+ * Let it proceed even though the PMAP_ENTER() failed.
+ */
+ kr = KERN_SUCCESS;
+ }
+#endif /* __x86_64__ */
+
+ if (kr == KERN_RESOURCE_SHORTAGE) {
+ if (need_retry) {
+ /*
+ * this will be non-null in the case where we hold the lock
+ * on the top-object in this chain... we can't just drop
+ * the lock on the object we're inserting the page into
+ * and recall the PMAP_ENTER since we can still cause
+ * a deadlock if one of the critical paths tries to
+ * acquire the lock on the top-object and we're blocked
+ * in PMAP_ENTER waiting for memory... our only recourse
+ * is to deal with it at a higher level where we can
+ * drop both locks.
+ */
+ *need_retry = TRUE;
+ vm_pmap_enter_retried++;
+ goto done;
+ }
+ /*
+ * The nonblocking version of pmap_enter did not succeed.
+ * and we don't need to drop other locks and retry
+ * at the level above us, so
+ * use the blocking version instead. Requires marking
+ * the page busy and unlocking the object
+ */
+ boolean_t was_busy = m->vmp_busy;
+
+ vm_object_lock_assert_exclusive(object);
+
+ m->vmp_busy = TRUE;
+ vm_object_unlock(object);
+
+ PMAP_ENTER_OPTIONS(pmap, vaddr,
+ fault_phys_offset,
+ m, *prot, fault_type,
+ 0, wired,
+ pmap_options, kr);
+
+ assert(VM_PAGE_OBJECT(m) == object);
+
+ /* Take the object lock again. */
+ vm_object_lock(object);
+
+ /* If the page was busy, someone else will wake it up.
+ * Otherwise, we have to do it now. */
+ assert(m->vmp_busy);
+ if (!was_busy) {
+ PAGE_WAKEUP_DONE(m);
+ }
+ vm_pmap_enter_blocked++;
+ }
+
+done:
+ return kr;
+}
+
+/*
+ * Prepare to enter a page into the pmap by checking CS, protection bits,
+ * and setting mapped bits on the page_t.
+ * Does not modify the page's paging queue.
+ *
+ * page queue lock must NOT be held
+ * m->vmp_object must be locked
+ *
+ * NOTE: m->vmp_object could be locked "shared" only if we are called
+ * from vm_fault() as part of a soft fault.
+ */
+static kern_return_t
+vm_fault_enter_prepare(
+ vm_page_t m,
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ vm_prot_t *prot,
+ vm_prot_t caller_prot,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ boolean_t change_wiring,
+ vm_prot_t fault_type,
+ vm_object_fault_info_t fault_info,
+ int *type_of_fault,
+ bool *page_needs_data_sync)
+{
+ kern_return_t kr;
+ bool is_tainted = false;
+ vm_object_t object;
+ boolean_t cs_bypass = fault_info->cs_bypass;
- if (no_cache && (!previously_pmapped || m->no_cache)) {
- m->no_cache = TRUE;
+ object = VM_PAGE_OBJECT(m);
- if (!m->speculative)
- vm_page_speculate(m, FALSE);
+ vm_object_lock_assert_held(object);
- } else if (!m->active && !m->inactive)
- vm_page_activate(m);
+#if KASAN
+ if (pmap == kernel_pmap) {
+ kasan_notify_address(vaddr, PAGE_SIZE);
+ }
+#endif
+
+ LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_NOTOWNED);
+ if (*type_of_fault == DBG_ZERO_FILL_FAULT) {
+ vm_object_lock_assert_exclusive(object);
+ } else if ((fault_type & VM_PROT_WRITE) == 0 &&
+ !change_wiring &&
+ (!m->vmp_wpmapped
+#if VM_OBJECT_ACCESS_TRACKING
+ || object->access_tracking
+#endif /* VM_OBJECT_ACCESS_TRACKING */
+ )) {
+ /*
+ * This is not a "write" fault, so we
+ * might not have taken the object lock
+ * exclusively and we might not be able
+ * to update the "wpmapped" bit in
+ * vm_fault_enter().
+ * Let's just grant read access to
+ * the page for now and we'll
+ * soft-fault again if we need write
+ * access later...
+ */
+
+ /* This had better not be a JIT page. */
+ if (!pmap_has_prot_policy(pmap, fault_info->pmap_options & PMAP_OPTIONS_TRANSLATED_ALLOW_EXECUTE, *prot)) {
+ *prot &= ~VM_PROT_WRITE;
+ } else {
+ assert(cs_bypass);
+ }
+ }
+ if (m->vmp_pmapped == FALSE) {
+ if (m->vmp_clustered) {
+ if (*type_of_fault == DBG_CACHE_HIT_FAULT) {
+ /*
+ * found it in the cache, but this
+ * is the first fault-in of the page (m->vmp_pmapped == FALSE)
+ * so it must have come in as part of
+ * a cluster... account 1 pagein against it
+ */
+ if (object->internal) {
+ *type_of_fault = DBG_PAGEIND_FAULT;
+ } else {
+ *type_of_fault = DBG_PAGEINV_FAULT;
}
- vm_page_unlock_queues();
+ VM_PAGE_COUNT_AS_PAGEIN(m);
+ }
+ VM_PAGE_CONSUME_CLUSTERED(m);
+ }
+ }
+
+ if (*type_of_fault != DBG_COW_FAULT) {
+ DTRACE_VM2(as_fault, int, 1, (uint64_t *), NULL);
+
+ if (pmap == kernel_pmap) {
+ DTRACE_VM2(kernel_asflt, int, 1, (uint64_t *), NULL);
+ }
+ }
+
+ kr = vm_fault_validate_cs(cs_bypass, object, m, pmap, vaddr,
+ *prot, caller_prot, fault_page_size, fault_phys_offset,
+ fault_info, &is_tainted);
+ if (kr == KERN_SUCCESS) {
+ /*
+ * We either have a good page, or a tainted page that has been accepted by the process.
+ * In both cases the page will be entered into the pmap.
+ */
+ *page_needs_data_sync = vm_fault_enter_set_mapped(object, m, *prot, fault_type);
+ if ((fault_type & VM_PROT_WRITE) && is_tainted) {
+ /*
+ * This page is tainted but we're inserting it anyways.
+ * Since it's writeable, we need to disconnect it from other pmaps
+ * now so those processes can take note.
+ */
+
+ /*
+ * We can only get here
+ * because of the CSE logic
+ */
+ assert(pmap_get_vm_map_cs_enforced(pmap));
+ pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(m));
+ /*
+ * If we are faulting for a write, we can clear
+ * the execute bit - that will ensure the page is
+ * checked again before being executable, which
+ * protects against a map switch.
+ * This only happens the first time the page
+ * gets tainted, so we won't get stuck here
+ * to make an already writeable page executable.
+ */
+ if (!cs_bypass) {
+ assert(!pmap_has_prot_policy(pmap, fault_info->pmap_options & PMAP_OPTIONS_TRANSLATED_ALLOW_EXECUTE, *prot));
+ *prot &= ~VM_PROT_EXECUTE;
}
}
+ assert(VM_PAGE_OBJECT(m) == object);
+
+#if VM_OBJECT_ACCESS_TRACKING
+ if (object->access_tracking) {
+ DTRACE_VM2(access_tracking, vm_map_offset_t, vaddr, int, fault_type);
+ if (fault_type & VM_PROT_WRITE) {
+ object->access_tracking_writes++;
+ vm_object_access_tracking_writes++;
+ } else {
+ object->access_tracking_reads++;
+ vm_object_access_tracking_reads++;
+ }
+ }
+#endif /* VM_OBJECT_ACCESS_TRACKING */
}
+
return kr;
}
+/*
+ * page queue lock must NOT be held
+ * m->vmp_object must be locked
+ *
+ * NOTE: m->vmp_object could be locked "shared" only if we are called
+ * from vm_fault() as part of a soft fault. If so, we must be
+ * careful not to modify the VM object in any way that is not
+ * legal under a shared lock...
+ */
+kern_return_t
+vm_fault_enter(
+ vm_page_t m,
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ vm_prot_t prot,
+ vm_prot_t caller_prot,
+ boolean_t wired,
+ boolean_t change_wiring,
+ vm_tag_t wire_tag,
+ vm_object_fault_info_t fault_info,
+ boolean_t *need_retry,
+ int *type_of_fault)
+{
+ kern_return_t kr;
+ vm_object_t object;
+ bool page_needs_data_sync;
+ vm_prot_t fault_type;
+ int pmap_options = fault_info->pmap_options;
+
+ if (VM_PAGE_GET_PHYS_PAGE(m) == vm_page_guard_addr) {
+ assert(m->vmp_fictitious);
+ return KERN_SUCCESS;
+ }
+
+ fault_type = change_wiring ? VM_PROT_NONE : caller_prot;
+
+ kr = vm_fault_enter_prepare(m, pmap, vaddr, &prot, caller_prot,
+ fault_page_size, fault_phys_offset, change_wiring, fault_type,
+ fault_info, type_of_fault, &page_needs_data_sync);
+ object = VM_PAGE_OBJECT(m);
+
+ vm_fault_enqueue_page(object, m, wired, change_wiring, wire_tag, fault_info->no_cache, type_of_fault, kr);
+
+ if (kr == KERN_SUCCESS) {
+ if (page_needs_data_sync) {
+ pmap_sync_page_data_phys(VM_PAGE_GET_PHYS_PAGE(m));
+ }
+
+ kr = vm_fault_pmap_enter_with_object_lock(object, pmap, vaddr,
+ fault_page_size, fault_phys_offset, m,
+ &prot, caller_prot, fault_type, wired, pmap_options, need_retry);
+ }
+
+ return kr;
+}
+
+void
+vm_pre_fault(vm_map_offset_t vaddr, vm_prot_t prot)
+{
+ if (pmap_find_phys(current_map()->pmap, vaddr) == 0) {
+ vm_fault(current_map(), /* map */
+ vaddr, /* vaddr */
+ prot, /* fault_type */
+ FALSE, /* change_wiring */
+ VM_KERN_MEMORY_NONE, /* tag - not wiring */
+ THREAD_UNINT, /* interruptible */
+ NULL, /* caller_pmap */
+ 0 /* caller_pmap_addr */);
+ }
+}
+
/*
* Routine: vm_fault
* and deallocated when leaving vm_fault.
*/
-extern int _map_enter_debug;
+extern uint64_t get_current_unique_pid(void);
unsigned long vm_fault_collapse_total = 0;
unsigned long vm_fault_collapse_skipped = 0;
+
+kern_return_t
+vm_fault_external(
+ vm_map_t map,
+ vm_map_offset_t vaddr,
+ vm_prot_t fault_type,
+ boolean_t change_wiring,
+ int interruptible,
+ pmap_t caller_pmap,
+ vm_map_offset_t caller_pmap_addr)
+{
+ return vm_fault_internal(map, vaddr, fault_type, change_wiring,
+ change_wiring ? vm_tag_bt() : VM_KERN_MEMORY_NONE,
+ interruptible, caller_pmap, caller_pmap_addr,
+ NULL);
+}
+
kern_return_t
vm_fault(
- vm_map_t map,
- vm_map_offset_t vaddr,
- vm_prot_t fault_type,
- boolean_t change_wiring,
- int interruptible,
- pmap_t caller_pmap,
- vm_map_offset_t caller_pmap_addr)
+ vm_map_t map,
+ vm_map_offset_t vaddr,
+ vm_prot_t fault_type,
+ boolean_t change_wiring,
+ vm_tag_t wire_tag, /* if wiring must pass tag != VM_KERN_MEMORY_NONE */
+ int interruptible,
+ pmap_t caller_pmap,
+ vm_map_offset_t caller_pmap_addr)
+{
+ return vm_fault_internal(map, vaddr, fault_type, change_wiring, wire_tag,
+ interruptible, caller_pmap, caller_pmap_addr,
+ NULL);
+}
+
+static boolean_t
+current_proc_is_privileged(void)
+{
+ return csproc_get_platform_binary(current_proc());
+}
+
+uint64_t vm_copied_on_read = 0;
+
+/*
+ * Cleanup after a vm_fault_enter.
+ * At this point, the fault should either have failed (kr != KERN_SUCCESS)
+ * or the page should be in the pmap and on the correct paging queue.
+ *
+ * Precondition:
+ * map must be locked shared.
+ * m_object must be locked.
+ * If top_object != VM_OBJECT_NULL, it must be locked.
+ * real_map must be locked.
+ *
+ * Postcondition:
+ * map will be unlocked
+ * m_object will be unlocked
+ * top_object will be unlocked
+ * If real_map != map, it will be unlocked
+ */
+static void
+vm_fault_complete(
+ vm_map_t map,
+ vm_map_t real_map,
+ vm_object_t object,
+ vm_object_t m_object,
+ vm_page_t m,
+ vm_map_offset_t offset,
+ vm_map_offset_t trace_real_vaddr,
+ vm_object_fault_info_t fault_info,
+ vm_prot_t caller_prot,
+#if CONFIG_DTRACE
+ vm_map_offset_t real_vaddr,
+#else
+ __unused vm_map_offset_t real_vaddr,
+#endif /* CONFIG_DTRACE */
+ int type_of_fault,
+ boolean_t need_retry,
+ kern_return_t kr,
+ ppnum_t *physpage_p,
+ vm_prot_t prot,
+ vm_object_t top_object,
+ boolean_t need_collapse,
+ vm_map_offset_t cur_offset,
+ vm_prot_t fault_type,
+ vm_object_t *written_on_object,
+ memory_object_t *written_on_pager,
+ vm_object_offset_t *written_on_offset)
{
- vm_map_version_t version; /* Map version for verificiation */
- boolean_t wired; /* Should mapping be wired down? */
- vm_object_t object; /* Top-level object */
- vm_object_offset_t offset; /* Top-level offset */
- vm_prot_t prot; /* Protection for mapping */
- vm_object_t old_copy_object; /* Saved copy object */
- vm_page_t result_page; /* Result of vm_fault_page */
- vm_page_t top_page; /* Placeholder page */
- kern_return_t kr;
-
- vm_page_t m; /* Fast access to result_page */
- kern_return_t error_code;
- vm_object_t cur_object;
- vm_object_offset_t cur_offset;
- vm_page_t cur_m;
- vm_object_t new_object;
+ int event_code = 0;
+ vm_map_lock_assert_shared(map);
+ vm_object_lock_assert_held(m_object);
+ if (top_object != VM_OBJECT_NULL) {
+ vm_object_lock_assert_held(top_object);
+ }
+ vm_map_lock_assert_held(real_map);
+
+ if (m_object->internal) {
+ event_code = (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_ADDR_INTERNAL));
+ } else if (m_object->object_is_shared_cache) {
+ event_code = (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_ADDR_SHAREDCACHE));
+ } else {
+ event_code = (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_ADDR_EXTERNAL));
+ }
+
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, event_code, trace_real_vaddr, (fault_info->user_tag << 16) | (caller_prot << 8) | type_of_fault, m->vmp_offset, get_current_unique_pid(), 0);
+ if (need_retry == FALSE) {
+ KDBG_FILTERED(MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_FAST), get_current_unique_pid(), 0, 0, 0, 0);
+ }
+ DTRACE_VM6(real_fault, vm_map_offset_t, real_vaddr, vm_map_offset_t, m->vmp_offset, int, event_code, int, caller_prot, int, type_of_fault, int, fault_info->user_tag);
+ if (kr == KERN_SUCCESS &&
+ physpage_p != NULL) {
+ /* for vm_map_wire_and_extract() */
+ *physpage_p = VM_PAGE_GET_PHYS_PAGE(m);
+ if (prot & VM_PROT_WRITE) {
+ vm_object_lock_assert_exclusive(m_object);
+ m->vmp_dirty = TRUE;
+ }
+ }
+
+ if (top_object != VM_OBJECT_NULL) {
+ /*
+ * It's safe to drop the top object
+ * now that we've done our
+ * vm_fault_enter(). Any other fault
+ * in progress for that virtual
+ * address will either find our page
+ * and translation or put in a new page
+ * and translation.
+ */
+ vm_object_unlock(top_object);
+ top_object = VM_OBJECT_NULL;
+ }
+
+ if (need_collapse == TRUE) {
+ vm_object_collapse(object, vm_object_trunc_page(offset), TRUE);
+ }
+
+ if (need_retry == FALSE &&
+ (type_of_fault == DBG_PAGEIND_FAULT || type_of_fault == DBG_PAGEINV_FAULT || type_of_fault == DBG_CACHE_HIT_FAULT)) {
+ /*
+ * evaluate access pattern and update state
+ * vm_fault_deactivate_behind depends on the
+ * state being up to date
+ */
+ vm_fault_is_sequential(m_object, cur_offset, fault_info->behavior);
+
+ vm_fault_deactivate_behind(m_object, cur_offset, fault_info->behavior);
+ }
+ /*
+ * That's it, clean up and return.
+ */
+ if (m->vmp_busy) {
+ vm_object_lock_assert_exclusive(m_object);
+ PAGE_WAKEUP_DONE(m);
+ }
+
+ if (need_retry == FALSE && !m_object->internal && (fault_type & VM_PROT_WRITE)) {
+ vm_object_paging_begin(m_object);
+
+ assert(*written_on_object == VM_OBJECT_NULL);
+ *written_on_object = m_object;
+ *written_on_pager = m_object->pager;
+ *written_on_offset = m_object->paging_offset + m->vmp_offset;
+ }
+ vm_object_unlock(object);
+
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
+}
+
+static inline int
+vm_fault_type_for_tracing(boolean_t need_copy_on_read, int type_of_fault)
+{
+ if (need_copy_on_read && type_of_fault == DBG_COW_FAULT) {
+ return DBG_COR_FAULT;
+ }
+ return type_of_fault;
+}
+
+kern_return_t
+vm_fault_internal(
+ vm_map_t map,
+ vm_map_offset_t vaddr,
+ vm_prot_t caller_prot,
+ boolean_t change_wiring,
+ vm_tag_t wire_tag, /* if wiring must pass tag != VM_KERN_MEMORY_NONE */
+ int interruptible,
+ pmap_t caller_pmap,
+ vm_map_offset_t caller_pmap_addr,
+ ppnum_t *physpage_p)
+{
+ vm_map_version_t version; /* Map version for verificiation */
+ boolean_t wired; /* Should mapping be wired down? */
+ vm_object_t object; /* Top-level object */
+ vm_object_offset_t offset; /* Top-level offset */
+ vm_prot_t prot; /* Protection for mapping */
+ vm_object_t old_copy_object; /* Saved copy object */
+ vm_page_t result_page; /* Result of vm_fault_page */
+ vm_page_t top_page; /* Placeholder page */
+ kern_return_t kr;
+
+ vm_page_t m; /* Fast access to result_page */
+ kern_return_t error_code;
+ vm_object_t cur_object;
+ vm_object_t m_object = NULL;
+ vm_object_offset_t cur_offset;
+ vm_page_t cur_m;
+ vm_object_t new_object;
int type_of_fault;
- pmap_t pmap;
- boolean_t interruptible_state;
- vm_map_t real_map = map;
- vm_map_t original_map = map;
- vm_prot_t original_fault_type;
- struct vm_object_fault_info fault_info;
- boolean_t need_collapse = FALSE;
- int object_lock_type = 0;
- int cur_object_lock_type;
- vm_object_t top_object = VM_OBJECT_NULL;
- int throttle_delay;
-
-
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_START,
- (int)((uint64_t)vaddr >> 32),
- (int)vaddr,
- (map == kernel_map),
- 0,
- 0);
+ pmap_t pmap;
+ wait_interrupt_t interruptible_state;
+ vm_map_t real_map = map;
+ vm_map_t original_map = map;
+ bool object_locks_dropped = FALSE;
+ vm_prot_t fault_type;
+ vm_prot_t original_fault_type;
+ struct vm_object_fault_info fault_info = {};
+ bool need_collapse = FALSE;
+ boolean_t need_retry = FALSE;
+ boolean_t *need_retry_ptr = NULL;
+ uint8_t object_lock_type = 0;
+ uint8_t cur_object_lock_type;
+ vm_object_t top_object = VM_OBJECT_NULL;
+ vm_object_t written_on_object = VM_OBJECT_NULL;
+ memory_object_t written_on_pager = NULL;
+ vm_object_offset_t written_on_offset = 0;
+ int throttle_delay;
+ int compressed_count_delta;
+ uint8_t grab_options;
+ bool need_copy;
+ bool need_copy_on_read;
+ vm_map_offset_t trace_vaddr;
+ vm_map_offset_t trace_real_vaddr;
+ vm_map_size_t fault_page_size;
+ vm_map_size_t fault_page_mask;
+ vm_map_offset_t fault_phys_offset;
+ vm_map_offset_t real_vaddr;
+ bool resilient_media_retry = FALSE;
+ vm_object_t resilient_media_object = VM_OBJECT_NULL;
+ vm_object_offset_t resilient_media_offset = (vm_object_offset_t)-1;
+ bool page_needs_data_sync = false;
+ /*
+ * Was the VM object contended when vm_map_lookup_locked locked it?
+ * If so, the zero fill path will drop the lock
+ * NB: Ideally we would always drop the lock rather than rely on
+ * this heuristic, but vm_object_unlock currently takes > 30 cycles.
+ */
+ bool object_is_contended = false;
+
+ real_vaddr = vaddr;
+ trace_real_vaddr = vaddr;
+
+ if (VM_MAP_PAGE_SIZE(original_map) < PAGE_SIZE) {
+ fault_phys_offset = (vm_map_offset_t)-1;
+ fault_page_size = VM_MAP_PAGE_SIZE(original_map);
+ fault_page_mask = VM_MAP_PAGE_MASK(original_map);
+ if (fault_page_size < PAGE_SIZE) {
+ DEBUG4K_FAULT("map %p vaddr 0x%llx caller_prot 0x%x\n", map, (uint64_t)trace_real_vaddr, caller_prot);
+ vaddr = vm_map_trunc_page(vaddr, fault_page_mask);
+ }
+ } else {
+ fault_phys_offset = 0;
+ fault_page_size = PAGE_SIZE;
+ fault_page_mask = PAGE_MASK;
+ vaddr = vm_map_trunc_page(vaddr, PAGE_MASK);
+ }
+
+ if (map == kernel_map) {
+ trace_vaddr = VM_KERNEL_ADDRHIDE(vaddr);
+ trace_real_vaddr = VM_KERNEL_ADDRHIDE(trace_real_vaddr);
+ } else {
+ trace_vaddr = vaddr;
+ }
+
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_START,
+ ((uint64_t)trace_vaddr >> 32),
+ trace_vaddr,
+ (map == kernel_map),
+ 0,
+ 0);
if (get_preemption_level() != 0) {
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_END,
- (int)((uint64_t)vaddr >> 32),
- (int)vaddr,
- KERN_FAILURE,
- 0,
- 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_END,
+ ((uint64_t)trace_vaddr >> 32),
+ trace_vaddr,
+ KERN_FAILURE,
+ 0,
+ 0);
+
+ return KERN_FAILURE;
+ }
+
+ thread_t cthread = current_thread();
+ bool rtfault = (cthread->sched_mode == TH_MODE_REALTIME);
+ uint64_t fstart = 0;
- return (KERN_FAILURE);
+ if (rtfault) {
+ fstart = mach_continuous_time();
}
-
+
interruptible_state = thread_interrupt_level(interruptible);
+ fault_type = (change_wiring ? VM_PROT_NONE : caller_prot);
+
VM_STAT_INCR(faults);
current_task()->faults++;
original_fault_type = fault_type;
- if (fault_type & VM_PROT_WRITE)
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
- else
- object_lock_type = OBJECT_LOCK_SHARED;
+ need_copy = FALSE;
+ if (fault_type & VM_PROT_WRITE) {
+ need_copy = TRUE;
+ }
+
+ if (need_copy || change_wiring) {
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ } else {
+ object_lock_type = OBJECT_LOCK_SHARED;
+ }
cur_object_lock_type = OBJECT_LOCK_SHARED;
+ if ((map == kernel_map) && (caller_prot & VM_PROT_WRITE)) {
+ if (compressor_map) {
+ if ((vaddr >= vm_map_min(compressor_map)) && (vaddr < vm_map_max(compressor_map))) {
+ panic("Write fault on compressor map, va: %p type: %u bounds: %p->%p", (void *) vaddr, caller_prot, (void *) vm_map_min(compressor_map), (void *) vm_map_max(compressor_map));
+ }
+ }
+ }
RetryFault:
+ assert(written_on_object == VM_OBJECT_NULL);
+
/*
* assume we will hit a page in the cache
* otherwise, explicitly override with
map = original_map;
vm_map_lock_read(map);
- kr = vm_map_lookup_locked(&map, vaddr, fault_type,
- object_lock_type, &version,
- &object, &offset, &prot, &wired,
- &fault_info,
- &real_map);
+ if (resilient_media_retry) {
+ /*
+ * If we have to insert a fake zero-filled page to hide
+ * a media failure to provide the real page, we need to
+ * resolve any pending copy-on-write on this mapping.
+ * VM_PROT_COPY tells vm_map_lookup_locked() to deal
+ * with that even if this is not a "write" fault.
+ */
+ need_copy = TRUE;
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ }
+
+ kr = vm_map_lookup_locked(&map, vaddr,
+ (fault_type | (need_copy ? VM_PROT_COPY : 0)),
+ object_lock_type, &version,
+ &object, &offset, &prot, &wired,
+ &fault_info,
+ &real_map,
+ &object_is_contended);
if (kr != KERN_SUCCESS) {
vm_map_unlock_read(map);
goto done;
}
+
+
pmap = real_map->pmap;
fault_info.interruptible = interruptible;
fault_info.stealth = FALSE;
fault_info.io_sync = FALSE;
fault_info.mark_zf_absent = FALSE;
+ fault_info.batch_pmap_op = FALSE;
+
+ if (resilient_media_retry) {
+ /*
+ * We're retrying this fault after having detected a media
+ * failure from a "resilient_media" mapping.
+ * Check that the mapping is still pointing at the object
+ * that just failed to provide a page.
+ */
+ assert(resilient_media_object != VM_OBJECT_NULL);
+ assert(resilient_media_offset != (vm_object_offset_t)-1);
+ if (object != VM_OBJECT_NULL &&
+ object == resilient_media_object &&
+ offset == resilient_media_offset &&
+ fault_info.resilient_media) {
+ /*
+ * This mapping still points at the same object
+ * and is still "resilient_media": proceed in
+ * "recovery-from-media-failure" mode, where we'll
+ * insert a zero-filled page in the top object.
+ */
+// printf("RESILIENT_MEDIA %s:%d recovering for object %p offset 0x%llx\n", __FUNCTION__, __LINE__, object, offset);
+ } else {
+ /* not recovering: reset state */
+// printf("RESILIENT_MEDIA %s:%d no recovery resilient %d object %p/%p offset 0x%llx/0x%llx\n", __FUNCTION__, __LINE__, fault_info.resilient_media, object, resilient_media_object, offset, resilient_media_offset);
+ resilient_media_retry = FALSE;
+ /* release our extra reference on failed object */
+// printf("FBDP %s:%d resilient_media_object %p deallocate\n", __FUNCTION__, __LINE__, resilient_media_object);
+ vm_object_deallocate(resilient_media_object);
+ resilient_media_object = VM_OBJECT_NULL;
+ resilient_media_offset = (vm_object_offset_t)-1;
+ }
+ } else {
+ assert(resilient_media_object == VM_OBJECT_NULL);
+ resilient_media_offset = (vm_object_offset_t)-1;
+ }
/*
* If the page is wired, we must fault for the current protection
*/
if (wired) {
fault_type = prot | VM_PROT_WRITE;
+ }
+ if (wired || need_copy) {
/*
* since we're treating this fault as a 'write'
* we must hold the top object lock exclusively
*/
if (object_lock_type == OBJECT_LOCK_SHARED) {
-
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
if (vm_object_lock_upgrade(object) == FALSE) {
- /*
+ /*
* couldn't upgrade, so explictly
* take the lock exclusively
*/
- vm_object_lock(object);
+ vm_object_lock(object);
}
}
}
-#if VM_FAULT_CLASSIFY
+#if VM_FAULT_CLASSIFY
/*
* Temporary data gathering code
*/
* and use the original fault path (which doesn't hold
* the map lock, and relies on busy pages).
* The give up cases include:
- * - Have to talk to pager.
+ * - Have to talk to pager.
* - Page is busy, absent or in error.
* - Pager has locked out desired access.
* - Fault needs to be restarted.
*
* The code is an infinite loop that moves one level down
* the shadow chain each time. cur_object and cur_offset
- * refer to the current object being examined. object and offset
+ * refer to the current object being examined. object and offset
* are the original object from the map. The loop is at the
* top level if and only if object and cur_object are the same.
*
*
*/
+#if defined(__arm64__)
+ /*
+ * Fail if reading an execute-only page in a
+ * pmap that enforces execute-only protection.
+ */
+ if (fault_type == VM_PROT_READ &&
+ (prot & VM_PROT_EXECUTE) &&
+ !(prot & VM_PROT_READ) &&
+ pmap_enforces_execute_only(pmap)) {
+ vm_object_unlock(object);
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
+ kr = KERN_PROTECTION_FAILURE;
+ goto done;
+ }
+#endif
+
+ fault_phys_offset = (vm_map_offset_t)offset - vm_map_trunc_page((vm_map_offset_t)offset, PAGE_MASK);
/*
* If this page is to be inserted in a copy delay object
* copy delay strategy is implemented in the slow fault page.
*/
if (object->copy_strategy == MEMORY_OBJECT_COPY_DELAY &&
- object->copy != VM_OBJECT_NULL && (fault_type & VM_PROT_WRITE))
- goto handle_copy_delay;
+ object->copy != VM_OBJECT_NULL && (fault_type & VM_PROT_WRITE)) {
+ goto handle_copy_delay;
+ }
cur_object = object;
cur_offset = offset;
+ grab_options = 0;
+#if CONFIG_SECLUDED_MEMORY
+ if (object->can_grab_secluded) {
+ grab_options |= VM_PAGE_GRAB_SECLUDED;
+ }
+#endif /* CONFIG_SECLUDED_MEMORY */
+
while (TRUE) {
if (!cur_object->pager_created &&
- cur_object->phys_contiguous) /* superpage */
+ cur_object->phys_contiguous) { /* superpage */
break;
+ }
if (cur_object->blocked_access) {
/*
break;
}
- m = vm_page_lookup(cur_object, cur_offset);
+ m = vm_page_lookup(cur_object, vm_object_trunc_page(cur_offset));
+ m_object = NULL;
if (m != VM_PAGE_NULL) {
- if (m->busy) {
- wait_result_t result;
+ m_object = cur_object;
+
+ if (m->vmp_busy) {
+ wait_result_t result;
/*
* in order to do the PAGE_ASSERT_WAIT, we must
* have object that 'm' belongs to locked exclusively
*/
if (object != cur_object) {
- vm_object_unlock(object);
-
if (cur_object_lock_type == OBJECT_LOCK_SHARED) {
-
- cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
if (vm_object_lock_upgrade(cur_object) == FALSE) {
- /*
+ /*
* couldn't upgrade so go do a full retry
- * immediately since we've already dropped
- * the top object lock associated with this page
- * and the current one got dropped due to the
- * failed upgrade... the state is no longer valid
+ * immediately since we can no longer be
+ * certain about cur_object (since we
+ * don't hold a reference on it)...
+ * first drop the top object lock
*/
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
+ vm_object_unlock(object);
+
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
goto RetryFault;
}
}
} else if (object_lock_type == OBJECT_LOCK_SHARED) {
-
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
if (vm_object_lock_upgrade(object) == FALSE) {
- /*
+ /*
* couldn't upgrade, so explictly take the lock
* exclusively and go relookup the page since we
* will have dropped the object lock and
* no need for a full retry since we're
* at the top level of the object chain
*/
- vm_object_lock(object);
+ vm_object_lock(object);
continue;
}
}
+ if ((m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) && m_object->internal) {
+ /*
+ * m->vmp_busy == TRUE and the object is locked exclusively
+ * if m->pageout_queue == TRUE after we acquire the
+ * queues lock, we are guaranteed that it is stable on
+ * the pageout queue and therefore reclaimable
+ *
+ * NOTE: this is only true for the internal pageout queue
+ * in the compressor world
+ */
+ assert(VM_CONFIG_COMPRESSOR_IS_PRESENT);
+
+ vm_page_lock_queues();
+
+ if (m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) {
+ vm_pageout_throttle_up(m);
+ vm_page_unlock_queues();
+
+ PAGE_WAKEUP_DONE(m);
+ goto reclaimed_from_pageout;
+ }
+ vm_page_unlock_queues();
+ }
+ if (object != cur_object) {
+ vm_object_unlock(object);
+ }
+
vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
result = PAGE_ASSERT_WAIT(m, interruptible);
vm_object_unlock(cur_object);
if (result == THREAD_WAITING) {
- result = thread_block(THREAD_CONTINUE_NULL);
+ result = thread_block(THREAD_CONTINUE_NULL);
counter(c_vm_fault_page_block_busy_kernel++);
}
- if (result == THREAD_AWAKENED || result == THREAD_RESTART)
- goto RetryFault;
+ if (result == THREAD_AWAKENED || result == THREAD_RESTART) {
+ goto RetryFault;
+ }
kr = KERN_ABORTED;
goto done;
}
- if (m->phys_page == vm_page_guard_addr) {
- /*
- * Guard page: let the slow path deal with it
- */
- break;
- }
- if (m->unusual && (m->error || m->restart || m->private || m->absent)) {
- /*
- * Unusual case... let the slow path deal with it
- */
- break;
- }
- if (VM_OBJECT_PURGEABLE_FAULT_ERROR(m->object)) {
- if (object != cur_object)
- vm_object_unlock(object);
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
- vm_object_unlock(cur_object);
- kr = KERN_MEMORY_ERROR;
- goto done;
- }
-
- if (m->encrypted) {
- /*
- * ENCRYPTED SWAP:
- * We've soft-faulted (because it's not in the page
- * table) on an encrypted page.
- * Keep the page "busy" so that no one messes with
- * it during the decryption.
- * Release the extra locks we're holding, keep only
- * the page's VM object lock.
- *
- * in order to set 'busy' on 'm', we must
- * have object that 'm' belongs to locked exclusively
- */
- if (object != cur_object) {
- vm_object_unlock(object);
-
+reclaimed_from_pageout:
+ if (m->vmp_laundry) {
+ if (object != cur_object) {
if (cur_object_lock_type == OBJECT_LOCK_SHARED) {
+ cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
- cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
-
- if (vm_object_lock_upgrade(cur_object) == FALSE) {
- /*
- * couldn't upgrade so go do a full retry
- * immediately since we've already dropped
- * the top object lock associated with this page
- * and the current one got dropped due to the
- * failed upgrade... the state is no longer valid
- */
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
+ vm_object_unlock(object);
+ vm_object_unlock(cur_object);
- goto RetryFault;
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
}
+
+ goto RetryFault;
}
} else if (object_lock_type == OBJECT_LOCK_SHARED) {
-
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
if (vm_object_lock_upgrade(object) == FALSE) {
- /*
+ /*
* couldn't upgrade, so explictly take the lock
* exclusively and go relookup the page since we
* will have dropped the object lock and
* no need for a full retry since we're
* at the top level of the object chain
*/
- vm_object_lock(object);
+ vm_object_lock(object);
continue;
}
}
- m->busy = TRUE;
-
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
-
- vm_page_decrypt(m, 0);
-
- assert(m->busy);
- PAGE_WAKEUP_DONE(m);
+ vm_pageout_steal_laundry(m, FALSE);
+ }
- vm_object_unlock(cur_object);
+ if (VM_PAGE_GET_PHYS_PAGE(m) == vm_page_guard_addr) {
/*
- * Retry from the top, in case anything
- * changed while we were decrypting...
+ * Guard page: let the slow path deal with it
*/
- goto RetryFault;
+ break;
}
- ASSERT_PAGE_DECRYPTED(m);
-
- if(vm_page_is_slideable(m)) {
+ if (m->vmp_unusual && (m->vmp_error || m->vmp_restart || m->vmp_private || m->vmp_absent)) {
/*
- * We might need to slide this page, and so,
- * we want to hold the VM object exclusively.
+ * Unusual case... let the slow path deal with it
*/
- if (object != cur_object) {
- if (cur_object_lock_type == OBJECT_LOCK_SHARED) {
- vm_object_unlock(object);
- vm_object_unlock(cur_object);
-
- cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
-
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
-
- goto RetryFault;
- }
- } else if (object_lock_type == OBJECT_LOCK_SHARED) {
-
+ break;
+ }
+ if (VM_OBJECT_PURGEABLE_FAULT_ERROR(m_object)) {
+ if (object != cur_object) {
vm_object_unlock(object);
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
- vm_map_unlock_read(map);
- goto RetryFault;
}
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
+ vm_object_unlock(cur_object);
+ kr = KERN_MEMORY_ERROR;
+ goto done;
}
+ assert(m_object == VM_PAGE_OBJECT(m));
- if (VM_FAULT_NEED_CS_VALIDATION(map->pmap, m)) {
-upgrade_for_validation:
+ if (vm_fault_cs_need_validation(map->pmap, m, m_object,
+ PAGE_SIZE, 0) ||
+ (physpage_p != NULL && (prot & VM_PROT_WRITE))) {
+upgrade_lock_and_retry:
/*
* We might need to validate this page
* against its code signature, so we
* want to hold the VM object exclusively.
*/
- if (object != cur_object) {
+ if (object != cur_object) {
if (cur_object_lock_type == OBJECT_LOCK_SHARED) {
vm_object_unlock(object);
vm_object_unlock(cur_object);
- cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
vm_map_unlock_read(map);
- if (real_map != map)
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
goto RetryFault;
}
-
} else if (object_lock_type == OBJECT_LOCK_SHARED) {
-
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
if (vm_object_lock_upgrade(object) == FALSE) {
- /*
+ /*
* couldn't upgrade, so explictly take the lock
* exclusively and go relookup the page since we
* will have dropped the object lock and
* no need for a full retry since we're
* at the top level of the object chain
*/
- vm_object_lock(object);
+ vm_object_lock(object);
continue;
}
*/
if (object == cur_object && object->copy == VM_OBJECT_NULL) {
-
goto FastPmapEnter;
}
- if ((fault_type & VM_PROT_WRITE) == 0) {
+ if (!need_copy &&
+ !fault_info.no_copy_on_read &&
+ cur_object != object &&
+ !cur_object->internal &&
+ !cur_object->pager_trusted &&
+ vm_protect_privileged_from_untrusted &&
+ !((prot & VM_PROT_EXECUTE) &&
+ cur_object->code_signed &&
+ pmap_get_vm_map_cs_enforced(caller_pmap ? caller_pmap : pmap)) &&
+ current_proc_is_privileged()) {
+ /*
+ * We're faulting on a page in "object" and
+ * went down the shadow chain to "cur_object"
+ * to find out that "cur_object"'s pager
+ * is not "trusted", i.e. we can not trust it
+ * to always return the same contents.
+ * Since the target is a "privileged" process,
+ * let's treat this as a copy-on-read fault, as
+ * if it was a copy-on-write fault.
+ * Once "object" gets a copy of this page, it
+ * won't have to rely on "cur_object" to
+ * provide the contents again.
+ *
+ * This is done by setting "need_copy" and
+ * retrying the fault from the top with the
+ * appropriate locking.
+ *
+ * Special case: if the mapping is executable
+ * and the untrusted object is code-signed and
+ * the process is "cs_enforced", we do not
+ * copy-on-read because that would break
+ * code-signing enforcement expectations (an
+ * executable page must belong to a code-signed
+ * object) and we can rely on code-signing
+ * to re-validate the page if it gets evicted
+ * and paged back in.
+ */
+// printf("COPY-ON-READ %s:%d map %p va 0x%llx page %p object %p offset 0x%llx UNTRUSTED: need copy-on-read!\n", __FUNCTION__, __LINE__, map, (uint64_t)vaddr, m, VM_PAGE_OBJECT(m), m->vmp_offset);
+ vm_copied_on_read++;
+ need_copy = TRUE;
+
+ vm_object_unlock(object);
+ vm_object_unlock(cur_object);
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
+ goto RetryFault;
+ }
+
+ if (!(fault_type & VM_PROT_WRITE) && !need_copy) {
+ if (!pmap_has_prot_policy(pmap, fault_info.pmap_options & PMAP_OPTIONS_TRANSLATED_ALLOW_EXECUTE, prot)) {
+ prot &= ~VM_PROT_WRITE;
+ } else {
+ /*
+ * For a protection that the pmap cares
+ * about, we must hand over the full
+ * set of protections (so that the pmap
+ * layer can apply any desired policy).
+ * This means that cs_bypass must be
+ * set, as this can force us to pass
+ * RWX.
+ */
+ assert(fault_info.cs_bypass);
+ }
- if (object != cur_object) {
- /*
+ if (object != cur_object) {
+ /*
* We still need to hold the top object
* lock here to prevent a race between
* a read fault (taking only "shared"
object_lock_type = cur_object_lock_type;
}
FastPmapEnter:
+ assert(m_object == VM_PAGE_OBJECT(m));
+
/*
* prepare for the pmap_enter...
* object and map are both locked
* m contains valid data
- * object == m->object
+ * object == m->vmp_object
* cur_object == NULL or it's been unlocked
* no paging references on either object or cur_object
*/
- if (caller_pmap) {
- kr = vm_fault_enter(m,
- caller_pmap,
- caller_pmap_addr,
- prot,
- fault_type,
- wired,
- change_wiring,
- fault_info.no_cache,
- fault_info.cs_bypass,
- &type_of_fault);
+ if (top_object != VM_OBJECT_NULL || object_lock_type != OBJECT_LOCK_EXCLUSIVE) {
+ need_retry_ptr = &need_retry;
} else {
- kr = vm_fault_enter(m,
- pmap,
- vaddr,
- prot,
- fault_type,
- wired,
- change_wiring,
- fault_info.no_cache,
- fault_info.cs_bypass,
- &type_of_fault);
+ need_retry_ptr = NULL;
}
- if (top_object != VM_OBJECT_NULL) {
- /*
- * It's safe to drop the top object
- * now that we've done our
- * vm_fault_enter(). Any other fault
- * in progress for that virtual
- * address will either find our page
- * and translation or put in a new page
- * and translation.
- */
- vm_object_unlock(top_object);
- top_object = VM_OBJECT_NULL;
+ if (fault_page_size < PAGE_SIZE) {
+ DEBUG4K_FAULT("map %p original %p pmap %p va 0x%llx caller pmap %p va 0x%llx pa 0x%llx (0x%llx+0x%llx) prot 0x%x caller_prot 0x%x\n", map, original_map, pmap, (uint64_t)vaddr, caller_pmap, (uint64_t)caller_pmap_addr, (uint64_t)((((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(m)) << PAGE_SHIFT) + fault_phys_offset), (uint64_t)(((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(m)) << PAGE_SHIFT), (uint64_t)fault_phys_offset, prot, caller_prot);
+ assertf((!(fault_phys_offset & FOURK_PAGE_MASK) &&
+ fault_phys_offset < PAGE_SIZE),
+ "0x%llx\n", (uint64_t)fault_phys_offset);
+ } else {
+ assertf(fault_phys_offset == 0,
+ "0x%llx\n", (uint64_t)fault_phys_offset);
}
- if (need_collapse == TRUE)
- vm_object_collapse(object, offset, TRUE);
-
- if (type_of_fault == DBG_PAGEIND_FAULT || type_of_fault == DBG_PAGEINV_FAULT || type_of_fault == DBG_CACHE_HIT_FAULT) {
- /*
- * evaluate access pattern and update state
- * vm_fault_deactivate_behind depends on the
- * state being up to date
- */
- vm_fault_is_sequential(object, cur_offset, fault_info.behavior);
-
- vm_fault_deactivate_behind(object, cur_offset, fault_info.behavior);
+ if (caller_pmap) {
+ kr = vm_fault_enter(m,
+ caller_pmap,
+ caller_pmap_addr,
+ fault_page_size,
+ fault_phys_offset,
+ prot,
+ caller_prot,
+ wired,
+ change_wiring,
+ wire_tag,
+ &fault_info,
+ need_retry_ptr,
+ &type_of_fault);
+ } else {
+ kr = vm_fault_enter(m,
+ pmap,
+ vaddr,
+ fault_page_size,
+ fault_phys_offset,
+ prot,
+ caller_prot,
+ wired,
+ change_wiring,
+ wire_tag,
+ &fault_info,
+ need_retry_ptr,
+ &type_of_fault);
}
- /*
- * That's it, clean up and return.
- */
- if (m->busy)
- PAGE_WAKEUP_DONE(m);
-
- vm_object_unlock(object);
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
+ vm_fault_complete(
+ map,
+ real_map,
+ object,
+ m_object,
+ m,
+ offset,
+ trace_real_vaddr,
+ &fault_info,
+ caller_prot,
+ real_vaddr,
+ vm_fault_type_for_tracing(need_copy_on_read, type_of_fault),
+ need_retry,
+ kr,
+ physpage_p,
+ prot,
+ top_object,
+ need_collapse,
+ cur_offset,
+ fault_type,
+ &written_on_object,
+ &written_on_pager,
+ &written_on_offset);
+ top_object = VM_OBJECT_NULL;
+ if (need_retry == TRUE) {
+ /*
+ * vm_fault_enter couldn't complete the PMAP_ENTER...
+ * at this point we don't hold any locks so it's safe
+ * to ask the pmap layer to expand the page table to
+ * accommodate this mapping... once expanded, we'll
+ * re-drive the fault which should result in vm_fault_enter
+ * being able to successfully enter the mapping this time around
+ */
+ (void)pmap_enter_options(
+ pmap, vaddr, 0, 0, 0, 0, 0,
+ PMAP_OPTIONS_NOENTER, NULL);
+ need_retry = FALSE;
+ goto RetryFault;
+ }
goto done;
}
/*
*/
assert(object_lock_type == OBJECT_LOCK_EXCLUSIVE);
- if ((throttle_delay = vm_page_throttled())) {
- /*
- * drop all of our locks...
- * wait until the free queue is
- * pumped back up and then
- * redrive the fault
- */
- if (object != cur_object)
- vm_object_unlock(cur_object);
- vm_object_unlock(object);
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
-
- VM_DEBUG_EVENT(vmf_cowdelay, VMF_COWDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
-
- delay(throttle_delay);
-
- if (!current_thread_aborted() && vm_page_wait((change_wiring) ?
- THREAD_UNINT :
- THREAD_ABORTSAFE))
- goto RetryFault;
- kr = KERN_ABORTED;
- goto done;
- }
- /*
+ /*
* If objects match, then
* object->copy must not be NULL (else control
* would be in previous code block), and we
* with which we can't cope with here.
*/
if (cur_object == object) {
- /*
+ /*
* must take the slow path to
* deal with the copy push
*/
break;
}
-
+
/*
* This is now a shadow based copy on write
* fault -- it requires a copy up the shadow
* chain.
*/
-
+ assert(m_object == VM_PAGE_OBJECT(m));
+
if ((cur_object_lock_type == OBJECT_LOCK_SHARED) &&
- VM_FAULT_NEED_CS_VALIDATION(NULL, m)) {
- goto upgrade_for_validation;
+ vm_fault_cs_need_validation(NULL, m, m_object,
+ PAGE_SIZE, 0)) {
+ goto upgrade_lock_and_retry;
}
/*
* need to remember current page, as it's the
* source of the copy.
*
- * at this point we hold locks on both
+ * at this point we hold locks on both
* object and cur_object... no need to take
* paging refs or mark pages BUSY since
* we don't drop either object lock until
* the page has been copied and inserted
*/
cur_m = m;
- m = vm_page_grab();
+ m = vm_page_grab_options(grab_options);
+ m_object = NULL;
if (m == VM_PAGE_NULL) {
- /*
+ /*
* no free page currently available...
* must take the slow path
*/
* the page copy.
*/
vm_page_copy(cur_m, m);
- vm_page_insert(m, object, offset);
- m->dirty = TRUE;
+ vm_page_insert(m, object, vm_object_trunc_page(offset));
+ if (VM_MAP_PAGE_MASK(map) != PAGE_MASK) {
+ DEBUG4K_FAULT("map %p vaddr 0x%llx page %p [%p 0x%llx] copied to %p [%p 0x%llx]\n", map, (uint64_t)vaddr, cur_m, VM_PAGE_OBJECT(cur_m), cur_m->vmp_offset, m, VM_PAGE_OBJECT(m), m->vmp_offset);
+ }
+ m_object = object;
+ SET_PAGE_DIRTY(m, FALSE);
/*
* Now cope with the source page and object
*/
- if (object->ref_count > 1 && cur_m->pmapped)
- pmap_disconnect(cur_m->phys_page);
+ if (object->ref_count > 1 && cur_m->vmp_pmapped) {
+ pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(cur_m));
+ } else if (VM_MAP_PAGE_SIZE(map) < PAGE_SIZE) {
+ /*
+ * We've copied the full 16K page but we're
+ * about to call vm_fault_enter() only for
+ * the 4K chunk we're faulting on. The other
+ * three 4K chunks in that page could still
+ * be pmapped in this pmap.
+ * Since the VM object layer thinks that the
+ * entire page has been dealt with and the
+ * original page might no longer be needed,
+ * it might collapse/bypass the original VM
+ * object and free its pages, which would be
+ * bad (and would trigger pmap_verify_free()
+ * assertions) if the other 4K chunks are still
+ * pmapped.
+ */
+ /*
+ * XXX FBDP TODO4K: to be revisisted
+ * Technically, we need to pmap_disconnect()
+ * only the target pmap's mappings for the 4K
+ * chunks of this 16K VM page. If other pmaps
+ * have PTEs on these chunks, that means that
+ * the associated VM map must have a reference
+ * on the VM object, so no need to worry about
+ * those.
+ * pmap_protect() for each 4K chunk would be
+ * better but we'd have to check which chunks
+ * are actually mapped before and after this
+ * one.
+ * A full-blown pmap_disconnect() is easier
+ * for now but not efficient.
+ */
+ DEBUG4K_FAULT("pmap_disconnect() page %p object %p offset 0x%llx phys 0x%x\n", cur_m, VM_PAGE_OBJECT(cur_m), cur_m->vmp_offset, VM_PAGE_GET_PHYS_PAGE(cur_m));
+ pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(cur_m));
+ }
+ if (cur_m->vmp_clustered) {
+ VM_PAGE_COUNT_AS_PAGEIN(cur_m);
+ VM_PAGE_CONSUME_CLUSTERED(cur_m);
+ vm_fault_is_sequential(cur_object, cur_offset, fault_info.behavior);
+ }
need_collapse = TRUE;
if (!cur_object->internal &&
cur_object->copy_strategy == MEMORY_OBJECT_COPY_DELAY) {
- /*
+ /*
* The object from which we've just
* copied a page is most probably backed
* by a vnode. We don't want to waste too
* and create a bottleneck when several tasks
* map the same file.
*/
- if (cur_object->copy == object) {
- /*
+ if (cur_object->copy == object) {
+ /*
* Shared mapping or no COW yet.
* We can never collapse a copy
* object into its backing object.
*/
- need_collapse = FALSE;
+ need_collapse = FALSE;
} else if (cur_object->copy == object->shadow &&
- object->shadow->resident_page_count == 0) {
- /*
+ object->shadow->resident_page_count == 0) {
+ /*
* Shared mapping after a COW occurred.
*/
- need_collapse = FALSE;
+ need_collapse = FALSE;
}
}
vm_object_unlock(cur_object);
- if (need_collapse == FALSE)
- vm_fault_collapse_skipped++;
+ if (need_collapse == FALSE) {
+ vm_fault_collapse_skipped++;
+ }
vm_fault_collapse_total++;
type_of_fault = DBG_COW_FAULT;
current_task()->cow_faults++;
goto FastPmapEnter;
-
} else {
/*
* No page at cur_object, cur_offset... m == NULL
*/
if (cur_object->pager_created) {
- if (MUST_ASK_PAGER(cur_object, cur_offset) == TRUE) {
- /*
+ vm_external_state_t compressor_external_state = VM_EXTERNAL_STATE_UNKNOWN;
+
+ if (MUST_ASK_PAGER(cur_object, cur_offset, compressor_external_state) == TRUE) {
+ int my_fault_type;
+ uint8_t c_flags = C_DONT_BLOCK;
+ bool insert_cur_object = FALSE;
+
+ /*
* May have to talk to a pager...
- * take the slow path.
+ * if so, take the slow path by
+ * doing a 'break' from the while (TRUE) loop
+ *
+ * external_state will only be set to VM_EXTERNAL_STATE_EXISTS
+ * if the compressor is active and the page exists there
+ */
+ if (compressor_external_state != VM_EXTERNAL_STATE_EXISTS) {
+ break;
+ }
+
+ if (map == kernel_map || real_map == kernel_map) {
+ /*
+ * can't call into the compressor with the kernel_map
+ * lock held, since the compressor may try to operate
+ * on the kernel map in order to return an empty c_segment
+ */
+ break;
+ }
+ if (object != cur_object) {
+ if (fault_type & VM_PROT_WRITE) {
+ c_flags |= C_KEEP;
+ } else {
+ insert_cur_object = TRUE;
+ }
+ }
+ if (insert_cur_object == TRUE) {
+ if (cur_object_lock_type == OBJECT_LOCK_SHARED) {
+ cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+
+ if (vm_object_lock_upgrade(cur_object) == FALSE) {
+ /*
+ * couldn't upgrade so go do a full retry
+ * immediately since we can no longer be
+ * certain about cur_object (since we
+ * don't hold a reference on it)...
+ * first drop the top object lock
+ */
+ vm_object_unlock(object);
+
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
+
+ goto RetryFault;
+ }
+ }
+ } else if (object_lock_type == OBJECT_LOCK_SHARED) {
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+
+ if (object != cur_object) {
+ /*
+ * we can't go for the upgrade on the top
+ * lock since the upgrade may block waiting
+ * for readers to drain... since we hold
+ * cur_object locked at this point, waiting
+ * for the readers to drain would represent
+ * a lock order inversion since the lock order
+ * for objects is the reference order in the
+ * shadown chain
+ */
+ vm_object_unlock(object);
+ vm_object_unlock(cur_object);
+
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
+
+ goto RetryFault;
+ }
+ if (vm_object_lock_upgrade(object) == FALSE) {
+ /*
+ * couldn't upgrade, so explictly take the lock
+ * exclusively and go relookup the page since we
+ * will have dropped the object lock and
+ * a different thread could have inserted
+ * a page at this offset
+ * no need for a full retry since we're
+ * at the top level of the object chain
+ */
+ vm_object_lock(object);
+
+ continue;
+ }
+ }
+ m = vm_page_grab_options(grab_options);
+ m_object = NULL;
+
+ if (m == VM_PAGE_NULL) {
+ /*
+ * no free page currently available...
+ * must take the slow path
+ */
+ break;
+ }
+
+ /*
+ * The object is and remains locked
+ * so no need to take a
+ * "paging_in_progress" reference.
+ */
+ bool shared_lock;
+ if ((object == cur_object &&
+ object_lock_type == OBJECT_LOCK_EXCLUSIVE) ||
+ (object != cur_object &&
+ cur_object_lock_type == OBJECT_LOCK_EXCLUSIVE)) {
+ shared_lock = FALSE;
+ } else {
+ shared_lock = TRUE;
+ }
+
+ kr = vm_compressor_pager_get(
+ cur_object->pager,
+ (vm_object_trunc_page(cur_offset)
+ + cur_object->paging_offset),
+ VM_PAGE_GET_PHYS_PAGE(m),
+ &my_fault_type,
+ c_flags,
+ &compressed_count_delta);
+
+ vm_compressor_pager_count(
+ cur_object->pager,
+ compressed_count_delta,
+ shared_lock,
+ cur_object);
+
+ if (kr != KERN_SUCCESS) {
+ vm_page_release(m, FALSE);
+ m = VM_PAGE_NULL;
+ }
+ /*
+ * If vm_compressor_pager_get() returns
+ * KERN_MEMORY_FAILURE, then the
+ * compressed data is permanently lost,
+ * so return this error immediately.
+ */
+ if (kr == KERN_MEMORY_FAILURE) {
+ if (object != cur_object) {
+ vm_object_unlock(cur_object);
+ }
+ vm_object_unlock(object);
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
+ goto done;
+ } else if (kr != KERN_SUCCESS) {
+ break;
+ }
+ m->vmp_dirty = TRUE;
+
+ /*
+ * If the object is purgeable, its
+ * owner's purgeable ledgers will be
+ * updated in vm_page_insert() but the
+ * page was also accounted for in a
+ * "compressed purgeable" ledger, so
+ * update that now.
*/
- break;
+ if (object != cur_object &&
+ !insert_cur_object) {
+ /*
+ * We're not going to insert
+ * the decompressed page into
+ * the object it came from.
+ *
+ * We're dealing with a
+ * copy-on-write fault on
+ * "object".
+ * We're going to decompress
+ * the page directly into the
+ * target "object" while
+ * keepin the compressed
+ * page for "cur_object", so
+ * no ledger update in that
+ * case.
+ */
+ } else if (((cur_object->purgable ==
+ VM_PURGABLE_DENY) &&
+ (!cur_object->vo_ledger_tag)) ||
+ (cur_object->vo_owner ==
+ NULL)) {
+ /*
+ * "cur_object" is not purgeable
+ * and is not ledger-taged, or
+ * there's no owner for it,
+ * so no owner's ledgers to
+ * update.
+ */
+ } else {
+ /*
+ * One less compressed
+ * purgeable/tagged page for
+ * cur_object's owner.
+ */
+ vm_object_owner_compressed_update(
+ cur_object,
+ -1);
+ }
+
+ if (insert_cur_object) {
+ vm_page_insert(m, cur_object, vm_object_trunc_page(cur_offset));
+ m_object = cur_object;
+ } else {
+ vm_page_insert(m, object, vm_object_trunc_page(offset));
+ m_object = object;
+ }
+
+ if ((m_object->wimg_bits & VM_WIMG_MASK) != VM_WIMG_USE_DEFAULT) {
+ /*
+ * If the page is not cacheable,
+ * we can't let its contents
+ * linger in the data cache
+ * after the decompression.
+ */
+ pmap_sync_page_attributes_phys(VM_PAGE_GET_PHYS_PAGE(m));
+ }
+
+ type_of_fault = my_fault_type;
+
+ VM_STAT_DECOMPRESSIONS();
+
+ if (cur_object != object) {
+ if (insert_cur_object) {
+ top_object = object;
+ /*
+ * switch to the object that has the new page
+ */
+ object = cur_object;
+ object_lock_type = cur_object_lock_type;
+ } else {
+ vm_object_unlock(cur_object);
+ cur_object = object;
+ }
+ }
+ goto FastPmapEnter;
}
/*
* existence map present and indicates
* that the pager doesn't have this page
*/
}
- if (cur_object->shadow == VM_OBJECT_NULL) {
+ if (cur_object->shadow == VM_OBJECT_NULL ||
+ resilient_media_retry) {
/*
* Zero fill fault. Page gets
* inserted into the original object.
*/
if (cur_object->shadow_severed ||
- VM_OBJECT_PURGEABLE_FAULT_ERROR(cur_object))
- {
- if (object != cur_object)
- vm_object_unlock(cur_object);
+ VM_OBJECT_PURGEABLE_FAULT_ERROR(cur_object) ||
+ cur_object == compressor_object ||
+ cur_object == kernel_object ||
+ cur_object == vm_submap_object) {
+ if (object != cur_object) {
+ vm_object_unlock(cur_object);
+ }
vm_object_unlock(object);
vm_map_unlock_read(map);
- if (real_map != map)
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
kr = KERN_MEMORY_ERROR;
goto done;
}
- if ((throttle_delay = vm_page_throttled())) {
- /*
- * drop all of our locks...
- * wait until the free queue is
- * pumped back up and then
- * redrive the fault
- */
- if (object != cur_object)
- vm_object_unlock(cur_object);
- vm_object_unlock(object);
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
-
- VM_DEBUG_EVENT(vmf_zfdelay, VMF_ZFDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
-
- delay(throttle_delay);
-
- if (!current_thread_aborted() && vm_page_wait((change_wiring) ?
- THREAD_UNINT :
- THREAD_ABORTSAFE))
- goto RetryFault;
- kr = KERN_ABORTED;
- goto done;
- }
- if (vm_backing_store_low) {
- /*
- * we are protecting the system from
- * backing store exhaustion...
- * must take the slow path if we're
- * not privileged
- */
- if (!(current_task()->priv_flags & VM_BACKING_STORE_PRIV))
- break;
- }
- if (cur_object != object) {
+ if (cur_object != object) {
vm_object_unlock(cur_object);
cur_object = object;
}
if (object_lock_type == OBJECT_LOCK_SHARED) {
-
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
if (vm_object_lock_upgrade(object) == FALSE) {
- /*
+ /*
* couldn't upgrade so do a full retry on the fault
* since we dropped the object lock which
* could allow another thread to insert
* a page at this offset
*/
- vm_map_unlock_read(map);
- if (real_map != map)
- vm_map_unlock(real_map);
+ vm_map_unlock_read(map);
+ if (real_map != map) {
+ vm_map_unlock(real_map);
+ }
goto RetryFault;
}
}
- m = vm_page_alloc(object, offset);
+ if (!object->internal) {
+ panic("%s:%d should not zero-fill page at offset 0x%llx in external object %p", __FUNCTION__, __LINE__, (uint64_t)offset, object);
+ }
+ m = vm_page_alloc(object, vm_object_trunc_page(offset));
+ m_object = NULL;
if (m == VM_PAGE_NULL) {
- /*
+ /*
* no free page currently available...
* must take the slow path
*/
break;
}
+ m_object = object;
/*
- * Now zero fill page...
- * the page is probably going to
- * be written soon, so don't bother
- * to clear the modified bit
+ * Zeroing the page and entering into it into the pmap
+ * represents a significant amount of the zero fill fault handler's work.
*
- * NOTE: This code holds the map
- * lock across the zero fill.
+ * To improve fault scalability, we'll drop the object lock, if it appears contended,
+ * now that we've inserted the page into the vm object.
+ * Before dropping the lock, we need to check protection bits and set the
+ * mapped bits on the page. Then we can mark the page busy, drop the lock,
+ * zero it, and do the pmap enter. We'll need to reacquire the lock
+ * to clear the busy bit and wake up any waiters.
*/
- type_of_fault = vm_fault_zero_page(m, map->no_zero_fill);
+ vm_fault_cs_clear(m);
+ m->vmp_pmapped = TRUE;
+ if (map->no_zero_fill) {
+ type_of_fault = DBG_NZF_PAGE_FAULT;
+ } else {
+ type_of_fault = DBG_ZERO_FILL_FAULT;
+ }
+ {
+ pmap_t destination_pmap;
+ vm_map_offset_t destination_pmap_vaddr;
+ vm_prot_t enter_fault_type;
+ if (caller_pmap) {
+ destination_pmap = caller_pmap;
+ destination_pmap_vaddr = caller_pmap_addr;
+ } else {
+ destination_pmap = pmap;
+ destination_pmap_vaddr = vaddr;
+ }
+ if (change_wiring) {
+ enter_fault_type = VM_PROT_NONE;
+ } else {
+ enter_fault_type = caller_prot;
+ }
+ kr = vm_fault_enter_prepare(m,
+ destination_pmap,
+ destination_pmap_vaddr,
+ &prot,
+ caller_prot,
+ fault_page_size,
+ fault_phys_offset,
+ change_wiring,
+ enter_fault_type,
+ &fault_info,
+ &type_of_fault,
+ &page_needs_data_sync);
+ if (kr != KERN_SUCCESS) {
+ goto zero_fill_cleanup;
+ }
- goto FastPmapEnter;
- }
+ if (object_is_contended) {
+ /*
+ * At this point the page is in the vm object, but not on a paging queue.
+ * Since it's accessible to another thread but its contents are invalid
+ * (it hasn't been zeroed) mark it busy before dropping the object lock.
+ */
+ m->vmp_busy = TRUE;
+ vm_object_unlock(object);
+ }
+ if (type_of_fault == DBG_ZERO_FILL_FAULT) {
+ /*
+ * Now zero fill page...
+ * the page is probably going to
+ * be written soon, so don't bother
+ * to clear the modified bit
+ *
+ * NOTE: This code holds the map
+ * lock across the zero fill.
+ */
+ vm_page_zero_fill(m);
+ VM_STAT_INCR(zero_fill_count);
+ DTRACE_VM2(zfod, int, 1, (uint64_t *), NULL);
+ }
+ if (page_needs_data_sync) {
+ pmap_sync_page_data_phys(VM_PAGE_GET_PHYS_PAGE(m));
+ }
+
+ if (top_object != VM_OBJECT_NULL) {
+ need_retry_ptr = &need_retry;
+ } else {
+ need_retry_ptr = NULL;
+ }
+ if (object_is_contended) {
+ kr = vm_fault_pmap_enter(destination_pmap, destination_pmap_vaddr,
+ fault_page_size, fault_phys_offset,
+ m, &prot, caller_prot, enter_fault_type, wired,
+ fault_info.pmap_options, need_retry_ptr);
+ vm_object_lock(object);
+ } else {
+ kr = vm_fault_pmap_enter_with_object_lock(object, destination_pmap, destination_pmap_vaddr,
+ fault_page_size, fault_phys_offset,
+ m, &prot, caller_prot, enter_fault_type, wired,
+ fault_info.pmap_options, need_retry_ptr);
+ }
+ }
+zero_fill_cleanup:
+ if (!VM_DYNAMIC_PAGING_ENABLED() &&
+ (object->purgable == VM_PURGABLE_DENY ||
+ object->purgable == VM_PURGABLE_NONVOLATILE ||
+ object->purgable == VM_PURGABLE_VOLATILE)) {
+ vm_page_lockspin_queues();
+ if (!VM_DYNAMIC_PAGING_ENABLED()) {
+ vm_fault_enqueue_throttled_locked(m);
+ }
+ vm_page_unlock_queues();
+ }
+ vm_fault_enqueue_page(object, m, wired, change_wiring, wire_tag, fault_info.no_cache, &type_of_fault, kr);
+
+ vm_fault_complete(
+ map,
+ real_map,
+ object,
+ m_object,
+ m,
+ offset,
+ trace_real_vaddr,
+ &fault_info,
+ caller_prot,
+ real_vaddr,
+ type_of_fault,
+ need_retry,
+ kr,
+ physpage_p,
+ prot,
+ top_object,
+ need_collapse,
+ cur_offset,
+ fault_type,
+ &written_on_object,
+ &written_on_pager,
+ &written_on_offset);
+ top_object = VM_OBJECT_NULL;
+ if (need_retry == TRUE) {
+ /*
+ * vm_fault_enter couldn't complete the PMAP_ENTER...
+ * at this point we don't hold any locks so it's safe
+ * to ask the pmap layer to expand the page table to
+ * accommodate this mapping... once expanded, we'll
+ * re-drive the fault which should result in vm_fault_enter
+ * being able to successfully enter the mapping this time around
+ */
+ (void)pmap_enter_options(
+ pmap, vaddr, 0, 0, 0, 0, 0,
+ PMAP_OPTIONS_NOENTER, NULL);
+
+ need_retry = FALSE;
+ goto RetryFault;
+ }
+ goto done;
+ }
/*
* On to the next level in the shadow chain
*/
cur_offset += cur_object->vo_shadow_offset;
new_object = cur_object->shadow;
+ fault_phys_offset = cur_offset - vm_object_trunc_page(cur_offset);
/*
* take the new_object's lock with the indicated state
*/
- if (cur_object_lock_type == OBJECT_LOCK_SHARED)
- vm_object_lock_shared(new_object);
- else
- vm_object_lock(new_object);
+ if (cur_object_lock_type == OBJECT_LOCK_SHARED) {
+ vm_object_lock_shared(new_object);
+ } else {
+ vm_object_lock(new_object);
+ }
- if (cur_object != object)
+ if (cur_object != object) {
vm_object_unlock(cur_object);
+ }
cur_object = new_object;
* Cleanup from fast fault failure. Drop any object
* lock other than original and drop map lock.
*/
- if (object != cur_object)
+ if (object != cur_object) {
vm_object_unlock(cur_object);
+ }
/*
* must own the object lock exclusively at this point
*/
if (object_lock_type == OBJECT_LOCK_SHARED) {
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
+ object_lock_type = OBJECT_LOCK_EXCLUSIVE;
if (vm_object_lock_upgrade(object) == FALSE) {
- /*
+ /*
* couldn't upgrade, so explictly
* take the lock exclusively
* no need to retry the fault at this
* point since "vm_fault_page" will
* completely re-evaluate the state
*/
- vm_object_lock(object);
+ vm_object_lock(object);
}
}
handle_copy_delay:
vm_map_unlock_read(map);
- if (real_map != map)
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
+
+ if (__improbable(object == compressor_object ||
+ object == kernel_object ||
+ object == vm_submap_object)) {
+ /*
+ * These objects are explicitly managed and populated by the
+ * kernel. The virtual ranges backed by these objects should
+ * either have wired pages or "holes" that are not supposed to
+ * be accessed at all until they get explicitly populated.
+ * We should never have to resolve a fault on a mapping backed
+ * by one of these VM objects and providing a zero-filled page
+ * would be wrong here, so let's fail the fault and let the
+ * caller crash or recover.
+ */
+ vm_object_unlock(object);
+ kr = KERN_MEMORY_ERROR;
+ goto done;
+ }
+
+ assert(object != compressor_object);
+ assert(object != kernel_object);
+ assert(object != vm_submap_object);
- /*
+ if (resilient_media_retry) {
+ /*
+ * We could get here if we failed to get a free page
+ * to zero-fill and had to take the slow path again.
+ * Reset our "recovery-from-failed-media" state.
+ */
+ assert(resilient_media_object != VM_OBJECT_NULL);
+ assert(resilient_media_offset != (vm_object_offset_t)-1);
+ /* release our extra reference on failed object */
+// printf("FBDP %s:%d resilient_media_object %p deallocate\n", __FUNCTION__, __LINE__, resilient_media_object);
+ vm_object_deallocate(resilient_media_object);
+ resilient_media_object = VM_OBJECT_NULL;
+ resilient_media_offset = (vm_object_offset_t)-1;
+ resilient_media_retry = FALSE;
+ }
+
+ /*
* Make a reference to this object to
* prevent its disposal while we are messing with
* it. Once we have the reference, the map is free
vm_object_reference_locked(object);
vm_object_paging_begin(object);
- XPR(XPR_VM_FAULT,"vm_fault -> vm_fault_page\n",0,0,0,0,0);
-
+ set_thread_pagein_error(cthread, 0);
error_code = 0;
+ result_page = VM_PAGE_NULL;
kr = vm_fault_page(object, offset, fault_type,
- (change_wiring && !wired),
- &prot, &result_page, &top_page,
- &type_of_fault,
- &error_code, map->no_zero_fill,
- FALSE, &fault_info);
+ (change_wiring && !wired),
+ FALSE, /* page not looked up */
+ &prot, &result_page, &top_page,
+ &type_of_fault,
+ &error_code, map->no_zero_fill,
+ FALSE, &fault_info);
/*
* if kr != VM_FAULT_SUCCESS, then the paging reference
*
* the object is returned locked with a paging reference
*
- * if top_page != NULL, then it's BUSY and the
+ * if top_page != NULL, then it's BUSY and the
* object it belongs to has a paging reference
* but is returned unlocked
*/
if (kr != VM_FAULT_SUCCESS &&
kr != VM_FAULT_SUCCESS_NO_VM_PAGE) {
- /*
- * we didn't succeed, lose the object reference immediately.
- */
- vm_object_deallocate(object);
+ if (kr == VM_FAULT_MEMORY_ERROR &&
+ fault_info.resilient_media) {
+ assertf(object->internal, "object %p", object);
+ /*
+ * This fault failed but the mapping was
+ * "media resilient", so we'll retry the fault in
+ * recovery mode to get a zero-filled page in the
+ * top object.
+ * Keep the reference on the failing object so
+ * that we can check that the mapping is still
+ * pointing to it when we retry the fault.
+ */
+// printf("RESILIENT_MEDIA %s:%d: object %p offset 0x%llx recover from media error 0x%x kr 0x%x top_page %p result_page %p\n", __FUNCTION__, __LINE__, object, offset, error_code, kr, top_page, result_page);
+ assert(!resilient_media_retry); /* no double retry */
+ assert(resilient_media_object == VM_OBJECT_NULL);
+ assert(resilient_media_offset == (vm_object_offset_t)-1);
+ resilient_media_retry = TRUE;
+ resilient_media_object = object;
+ resilient_media_offset = offset;
+// printf("FBDP %s:%d resilient_media_object %p offset 0x%llx kept reference\n", __FUNCTION__, __LINE__, resilient_media_object, resilient_mmedia_offset);
+ goto RetryFault;
+ } else {
+ /*
+ * we didn't succeed, lose the object reference
+ * immediately.
+ */
+ vm_object_deallocate(object);
+ object = VM_OBJECT_NULL; /* no longer valid */
+ }
/*
* See why we failed, and take corrective action.
*/
switch (kr) {
case VM_FAULT_MEMORY_SHORTAGE:
- if (vm_page_wait((change_wiring) ?
- THREAD_UNINT :
- THREAD_ABORTSAFE))
+ if (vm_page_wait((change_wiring) ?
+ THREAD_UNINT :
+ THREAD_ABORTSAFE)) {
goto RetryFault;
- /*
- * fall thru
- */
+ }
+ OS_FALLTHROUGH;
case VM_FAULT_INTERRUPTED:
kr = KERN_ABORTED;
goto done;
case VM_FAULT_RETRY:
goto RetryFault;
case VM_FAULT_MEMORY_ERROR:
- if (error_code)
+ if (error_code) {
kr = error_code;
- else
+ } else {
kr = KERN_MEMORY_ERROR;
+ }
goto done;
default:
panic("vm_fault: unexpected error 0x%x from "
- "vm_fault_page()\n", kr);
+ "vm_fault_page()\n", kr);
}
}
m = result_page;
+ m_object = NULL;
if (m != VM_PAGE_NULL) {
+ m_object = VM_PAGE_OBJECT(m);
assert((change_wiring && !wired) ?
- (top_page == VM_PAGE_NULL) :
- ((top_page == VM_PAGE_NULL) == (m->object == object)));
+ (top_page == VM_PAGE_NULL) :
+ ((top_page == VM_PAGE_NULL) == (m_object == object)));
}
/*
* What to do with the resulting page from vm_fault_page
* if it doesn't get entered into the physical map:
*/
-#define RELEASE_PAGE(m) \
- MACRO_BEGIN \
- PAGE_WAKEUP_DONE(m); \
- if (!m->active && !m->inactive && !m->throttled) { \
- vm_page_lockspin_queues(); \
- if (!m->active && !m->inactive && !m->throttled) \
- vm_page_activate(m); \
- vm_page_unlock_queues(); \
- } \
+#define RELEASE_PAGE(m) \
+ MACRO_BEGIN \
+ PAGE_WAKEUP_DONE(m); \
+ if ( !VM_PAGE_PAGEABLE(m)) { \
+ vm_page_lockspin_queues(); \
+ if ( !VM_PAGE_PAGEABLE(m)) \
+ vm_page_activate(m); \
+ vm_page_unlock_queues(); \
+ } \
MACRO_END
+
+ object_locks_dropped = FALSE;
/*
* We must verify that the maps have not changed
- * since our last lookup.
+ * since our last lookup. vm_map_verify() needs the
+ * map lock (shared) but we are holding object locks.
+ * So we do a try_lock() first and, if that fails, we
+ * drop the object locks and go in for the map lock again.
*/
- if (m != VM_PAGE_NULL) {
- old_copy_object = m->object->copy;
- vm_object_unlock(m->object);
- } else {
- old_copy_object = VM_OBJECT_NULL;
- vm_object_unlock(object);
+ if (!vm_map_try_lock_read(original_map)) {
+ if (m != VM_PAGE_NULL) {
+ old_copy_object = m_object->copy;
+ vm_object_unlock(m_object);
+ } else {
+ old_copy_object = VM_OBJECT_NULL;
+ vm_object_unlock(object);
+ }
+
+ object_locks_dropped = TRUE;
+
+ vm_map_lock_read(original_map);
}
- /*
- * no object locks are held at this point
- */
if ((map != original_map) || !vm_map_verify(map, &version)) {
- vm_object_t retry_object;
- vm_object_offset_t retry_offset;
- vm_prot_t retry_prot;
+ if (object_locks_dropped == FALSE) {
+ if (m != VM_PAGE_NULL) {
+ old_copy_object = m_object->copy;
+ vm_object_unlock(m_object);
+ } else {
+ old_copy_object = VM_OBJECT_NULL;
+ vm_object_unlock(object);
+ }
+
+ object_locks_dropped = TRUE;
+ }
+
+ /*
+ * no object locks are held at this point
+ */
+ vm_object_t retry_object;
+ vm_object_offset_t retry_offset;
+ vm_prot_t retry_prot;
/*
* To avoid trying to write_lock the map while another
* take another fault.
*/
map = original_map;
- vm_map_lock_read(map);
kr = vm_map_lookup_locked(&map, vaddr,
- fault_type & ~VM_PROT_WRITE,
- OBJECT_LOCK_EXCLUSIVE, &version,
- &retry_object, &retry_offset, &retry_prot,
- &wired,
- &fault_info,
- &real_map);
+ fault_type & ~VM_PROT_WRITE,
+ OBJECT_LOCK_EXCLUSIVE, &version,
+ &retry_object, &retry_offset, &retry_prot,
+ &wired,
+ &fault_info,
+ &real_map,
+ NULL);
pmap = real_map->pmap;
if (kr != KERN_SUCCESS) {
vm_map_unlock_read(map);
if (m != VM_PAGE_NULL) {
- /*
+ assert(VM_PAGE_OBJECT(m) == m_object);
+
+ /*
* retake the lock so that
* we can drop the paging reference
* in vm_fault_cleanup and do the
* PAGE_WAKEUP_DONE in RELEASE_PAGE
*/
- vm_object_lock(m->object);
+ vm_object_lock(m_object);
RELEASE_PAGE(m);
- vm_fault_cleanup(m->object, top_page);
+ vm_fault_cleanup(m_object, top_page);
} else {
- /*
+ /*
* retake the lock so that
* we can drop the paging reference
* in vm_fault_cleanup
*/
- vm_object_lock(object);
+ vm_object_lock(object);
- vm_fault_cleanup(object, top_page);
+ vm_fault_cleanup(object, top_page);
}
vm_object_deallocate(object);
vm_object_unlock(retry_object);
if ((retry_object != object) || (retry_offset != offset)) {
-
vm_map_unlock_read(map);
- if (real_map != map)
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
if (m != VM_PAGE_NULL) {
- /*
+ assert(VM_PAGE_OBJECT(m) == m_object);
+
+ /*
* retake the lock so that
* we can drop the paging reference
* in vm_fault_cleanup and do the
* PAGE_WAKEUP_DONE in RELEASE_PAGE
*/
- vm_object_lock(m->object);
+ vm_object_lock(m_object);
RELEASE_PAGE(m);
- vm_fault_cleanup(m->object, top_page);
+ vm_fault_cleanup(m_object, top_page);
} else {
- /*
+ /*
* retake the lock so that
* we can drop the paging reference
* in vm_fault_cleanup
*/
- vm_object_lock(object);
+ vm_object_lock(object);
- vm_fault_cleanup(object, top_page);
+ vm_fault_cleanup(object, top_page);
}
vm_object_deallocate(object);
* Check whether the protection has changed or the object
* has been copied while we left the map unlocked.
*/
- prot &= retry_prot;
+ if (pmap_has_prot_policy(pmap, fault_info.pmap_options & PMAP_OPTIONS_TRANSLATED_ALLOW_EXECUTE, retry_prot)) {
+ /* If the pmap layer cares, pass the full set. */
+ prot = retry_prot;
+ } else {
+ prot &= retry_prot;
+ }
}
- if (m != VM_PAGE_NULL) {
- vm_object_lock(m->object);
- if (m->object->copy != old_copy_object) {
- /*
- * The copy object changed while the top-level object
- * was unlocked, so take away write permission.
- */
- prot &= ~VM_PROT_WRITE;
+ if (object_locks_dropped == TRUE) {
+ if (m != VM_PAGE_NULL) {
+ vm_object_lock(m_object);
+
+ if (m_object->copy != old_copy_object) {
+ /*
+ * The copy object changed while the top-level object
+ * was unlocked, so take away write permission.
+ */
+ assert(!pmap_has_prot_policy(pmap, fault_info.pmap_options & PMAP_OPTIONS_TRANSLATED_ALLOW_EXECUTE, prot));
+ prot &= ~VM_PROT_WRITE;
+ }
+ } else {
+ vm_object_lock(object);
}
- } else
- vm_object_lock(object);
+
+ object_locks_dropped = FALSE;
+ }
+
+ if (!need_copy &&
+ !fault_info.no_copy_on_read &&
+ m != VM_PAGE_NULL &&
+ VM_PAGE_OBJECT(m) != object &&
+ !VM_PAGE_OBJECT(m)->pager_trusted &&
+ vm_protect_privileged_from_untrusted &&
+ !((prot & VM_PROT_EXECUTE) &&
+ VM_PAGE_OBJECT(m)->code_signed &&
+ pmap_get_vm_map_cs_enforced(caller_pmap ? caller_pmap : pmap)) &&
+ current_proc_is_privileged()) {
+ /*
+ * We found the page we want in an "untrusted" VM object
+ * down the shadow chain. Since the target is "privileged"
+ * we want to perform a copy-on-read of that page, so that the
+ * mapped object gets a stable copy and does not have to
+ * rely on the "untrusted" object to provide the same
+ * contents if the page gets reclaimed and has to be paged
+ * in again later on.
+ *
+ * Special case: if the mapping is executable and the untrusted
+ * object is code-signed and the process is "cs_enforced", we
+ * do not copy-on-read because that would break code-signing
+ * enforcement expectations (an executable page must belong
+ * to a code-signed object) and we can rely on code-signing
+ * to re-validate the page if it gets evicted and paged back in.
+ */
+// printf("COPY-ON-READ %s:%d map %p vaddr 0x%llx obj %p offset 0x%llx found page %p (obj %p offset 0x%llx) UNTRUSTED -> need copy-on-read\n", __FUNCTION__, __LINE__, map, (uint64_t)vaddr, object, offset, m, VM_PAGE_OBJECT(m), m->vmp_offset);
+ vm_copied_on_read++;
+ need_copy_on_read = TRUE;
+ need_copy = TRUE;
+ } else {
+ need_copy_on_read = FALSE;
+ }
/*
* If we want to wire down this page, but no longer have
* adequate permissions, we must start all over.
+ * If we decided to copy-on-read, we must also start all over.
*/
- if (wired && (fault_type != (prot | VM_PROT_WRITE))) {
-
- vm_map_verify_done(map, &version);
- if (real_map != map)
+ if ((wired && (fault_type != (prot | VM_PROT_WRITE))) ||
+ need_copy_on_read) {
+ vm_map_unlock_read(map);
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
if (m != VM_PAGE_NULL) {
+ assert(VM_PAGE_OBJECT(m) == m_object);
+
RELEASE_PAGE(m);
- vm_fault_cleanup(m->object, top_page);
- } else
- vm_fault_cleanup(object, top_page);
+ vm_fault_cleanup(m_object, top_page);
+ } else {
+ vm_fault_cleanup(object, top_page);
+ }
vm_object_deallocate(object);
* the pageout queues. If the pageout daemon comes
* across the page, it will remove it from the queues.
*/
+ if (fault_page_size < PAGE_SIZE) {
+ DEBUG4K_FAULT("map %p original %p pmap %p va 0x%llx pa 0x%llx(0x%llx+0x%llx) prot 0x%x caller_prot 0x%x\n", map, original_map, pmap, (uint64_t)vaddr, (uint64_t)((((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(m)) << PAGE_SHIFT) + fault_phys_offset), (uint64_t)(((pmap_paddr_t)VM_PAGE_GET_PHYS_PAGE(m)) << PAGE_SHIFT), (uint64_t)fault_phys_offset, prot, caller_prot);
+ assertf((!(fault_phys_offset & FOURK_PAGE_MASK) &&
+ fault_phys_offset < PAGE_SIZE),
+ "0x%llx\n", (uint64_t)fault_phys_offset);
+ } else {
+ assertf(fault_phys_offset == 0,
+ "0x%llx\n", (uint64_t)fault_phys_offset);
+ }
if (caller_pmap) {
kr = vm_fault_enter(m,
- caller_pmap,
- caller_pmap_addr,
- prot,
- fault_type,
- wired,
- change_wiring,
- fault_info.no_cache,
- fault_info.cs_bypass,
- &type_of_fault);
+ caller_pmap,
+ caller_pmap_addr,
+ fault_page_size,
+ fault_phys_offset,
+ prot,
+ caller_prot,
+ wired,
+ change_wiring,
+ wire_tag,
+ &fault_info,
+ NULL,
+ &type_of_fault);
} else {
kr = vm_fault_enter(m,
- pmap,
- vaddr,
- prot,
- fault_type,
- wired,
- change_wiring,
- fault_info.no_cache,
- fault_info.cs_bypass,
- &type_of_fault);
+ pmap,
+ vaddr,
+ fault_page_size,
+ fault_phys_offset,
+ prot,
+ caller_prot,
+ wired,
+ change_wiring,
+ wire_tag,
+ &fault_info,
+ NULL,
+ &type_of_fault);
+ }
+ assert(VM_PAGE_OBJECT(m) == m_object);
+
+ {
+ int event_code = 0;
+
+ if (m_object->internal) {
+ event_code = (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_ADDR_INTERNAL));
+ } else if (m_object->object_is_shared_cache) {
+ event_code = (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_ADDR_SHAREDCACHE));
+ } else {
+ event_code = (MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_ADDR_EXTERNAL));
+ }
+
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE, event_code, trace_real_vaddr, (fault_info.user_tag << 16) | (caller_prot << 8) | vm_fault_type_for_tracing(need_copy_on_read, type_of_fault), m->vmp_offset, get_current_unique_pid(), 0);
+ KDBG_FILTERED(MACHDBG_CODE(DBG_MACH_WORKINGSET, VM_REAL_FAULT_SLOW), get_current_unique_pid(), 0, 0, 0, 0);
+
+ DTRACE_VM6(real_fault, vm_map_offset_t, real_vaddr, vm_map_offset_t, m->vmp_offset, int, event_code, int, caller_prot, int, type_of_fault, int, fault_info.user_tag);
}
if (kr != KERN_SUCCESS) {
/* abort this page fault */
- vm_map_verify_done(map, &version);
- if (real_map != map)
+ vm_map_unlock_read(map);
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
PAGE_WAKEUP_DONE(m);
- vm_fault_cleanup(m->object, top_page);
+ vm_fault_cleanup(m_object, top_page);
vm_object_deallocate(object);
goto done;
}
+ if (physpage_p != NULL) {
+ /* for vm_map_wire_and_extract() */
+ *physpage_p = VM_PAGE_GET_PHYS_PAGE(m);
+ if (prot & VM_PROT_WRITE) {
+ vm_object_lock_assert_exclusive(m_object);
+ m->vmp_dirty = TRUE;
+ }
+ }
} else {
+ vm_map_entry_t entry;
+ vm_map_offset_t laddr;
+ vm_map_offset_t ldelta, hdelta;
- vm_map_entry_t entry;
- vm_map_offset_t laddr;
- vm_map_offset_t ldelta, hdelta;
-
- /*
+ /*
* do a pmap block mapping from the physical address
- * in the object
+ * in the object
*/
-#ifdef ppc
- /* While we do not worry about execution protection in */
- /* general, certian pages may have instruction execution */
- /* disallowed. We will check here, and if not allowed */
- /* to execute, we return with a protection failure. */
-
- if ((fault_type & VM_PROT_EXECUTE) &&
- (!pmap_eligible_for_execute((ppnum_t)(object->vo_shadow_offset >> 12)))) {
-
- vm_map_verify_done(map, &version);
-
- if (real_map != map)
- vm_map_unlock(real_map);
-
- vm_fault_cleanup(object, top_page);
- vm_object_deallocate(object);
-
- kr = KERN_PROTECTION_FAILURE;
- goto done;
- }
-#endif /* ppc */
-
- if (real_map != map)
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
if (original_map != map) {
vm_map_unlock_read(map);
ldelta = 0xFFFFF000;
while (vm_map_lookup_entry(map, laddr, &entry)) {
- if (ldelta > (laddr - entry->vme_start))
+ if (ldelta > (laddr - entry->vme_start)) {
ldelta = laddr - entry->vme_start;
- if (hdelta > (entry->vme_end - laddr))
+ }
+ if (hdelta > (entry->vme_end - laddr)) {
hdelta = entry->vme_end - laddr;
+ }
if (entry->is_sub_map) {
-
- laddr = (laddr - entry->vme_start)
- + entry->offset;
- vm_map_lock_read(entry->object.sub_map);
+ laddr = ((laddr - entry->vme_start)
+ + VME_OFFSET(entry));
+ vm_map_lock_read(VME_SUBMAP(entry));
- if (map != real_map)
+ if (map != real_map) {
vm_map_unlock_read(map);
+ }
if (entry->use_pmap) {
vm_map_unlock_read(real_map);
- real_map = entry->object.sub_map;
+ real_map = VME_SUBMAP(entry);
}
- map = entry->object.sub_map;
-
+ map = VME_SUBMAP(entry);
} else {
break;
}
}
- if (vm_map_lookup_entry(map, laddr, &entry) &&
- (entry->object.vm_object != NULL) &&
- (entry->object.vm_object == object)) {
+ if (vm_map_lookup_entry(map, laddr, &entry) &&
+ (VME_OBJECT(entry) != NULL) &&
+ (VME_OBJECT(entry) == object)) {
+ uint16_t superpage;
+
+ if (!object->pager_created &&
+ object->phys_contiguous &&
+ VME_OFFSET(entry) == 0 &&
+ (entry->vme_end - entry->vme_start == object->vo_size) &&
+ VM_MAP_PAGE_ALIGNED(entry->vme_start, (object->vo_size - 1))) {
+ superpage = VM_MEM_SUPERPAGE;
+ } else {
+ superpage = 0;
+ }
+
+ if (superpage && physpage_p) {
+ /* for vm_map_wire_and_extract() */
+ *physpage_p = (ppnum_t)
+ ((((vm_map_offset_t)
+ object->vo_shadow_offset)
+ + VME_OFFSET(entry)
+ + (laddr - entry->vme_start))
+ >> PAGE_SHIFT);
+ }
- int superpage = (!object->pager_created && object->phys_contiguous)? VM_MEM_SUPERPAGE : 0;
if (caller_pmap) {
/*
* Set up a block mapped area
*/
- assert((uint32_t)((ldelta + hdelta) >> 12) == ((ldelta + hdelta) >> 12));
- pmap_map_block(caller_pmap,
- (addr64_t)(caller_pmap_addr - ldelta),
- (ppnum_t)((((vm_map_offset_t) (entry->object.vm_object->vo_shadow_offset)) +
- entry->offset + (laddr - entry->vme_start) - ldelta) >> 12),
- (uint32_t)((ldelta + hdelta) >> 12), prot,
- (VM_WIMG_MASK & (int)object->wimg_bits) | superpage, 0);
- } else {
+ assert((uint32_t)((ldelta + hdelta) >> PAGE_SHIFT) == ((ldelta + hdelta) >> PAGE_SHIFT));
+ kr = pmap_map_block(caller_pmap,
+ (addr64_t)(caller_pmap_addr - ldelta),
+ (ppnum_t)((((vm_map_offset_t) (VME_OBJECT(entry)->vo_shadow_offset)) +
+ VME_OFFSET(entry) + (laddr - entry->vme_start) - ldelta) >> PAGE_SHIFT),
+ (uint32_t)((ldelta + hdelta) >> PAGE_SHIFT), prot,
+ (VM_WIMG_MASK & (int)object->wimg_bits) | superpage, 0);
+
+ if (kr != KERN_SUCCESS) {
+ goto cleanup;
+ }
+ } else {
/*
* Set up a block mapped area
*/
- assert((uint32_t)((ldelta + hdelta) >> 12) == ((ldelta + hdelta) >> 12));
- pmap_map_block(real_map->pmap,
- (addr64_t)(vaddr - ldelta),
- (ppnum_t)((((vm_map_offset_t)(entry->object.vm_object->vo_shadow_offset)) +
- entry->offset + (laddr - entry->vme_start) - ldelta) >> 12),
- (uint32_t)((ldelta + hdelta) >> 12), prot,
- (VM_WIMG_MASK & (int)object->wimg_bits) | superpage, 0);
+ assert((uint32_t)((ldelta + hdelta) >> PAGE_SHIFT) == ((ldelta + hdelta) >> PAGE_SHIFT));
+ kr = pmap_map_block(real_map->pmap,
+ (addr64_t)(vaddr - ldelta),
+ (ppnum_t)((((vm_map_offset_t)(VME_OBJECT(entry)->vo_shadow_offset)) +
+ VME_OFFSET(entry) + (laddr - entry->vme_start) - ldelta) >> PAGE_SHIFT),
+ (uint32_t)((ldelta + hdelta) >> PAGE_SHIFT), prot,
+ (VM_WIMG_MASK & (int)object->wimg_bits) | superpage, 0);
+
+ if (kr != KERN_SUCCESS) {
+ goto cleanup;
+ }
}
}
}
+ /*
+ * Success
+ */
+ kr = KERN_SUCCESS;
+
+ /*
+ * TODO: could most of the done cases just use cleanup?
+ */
+cleanup:
/*
* Unlock everything, and return
*/
- vm_map_verify_done(map, &version);
- if (real_map != map)
+ vm_map_unlock_read(map);
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
if (m != VM_PAGE_NULL) {
+ assert(VM_PAGE_OBJECT(m) == m_object);
+
+ if (!m_object->internal && (fault_type & VM_PROT_WRITE)) {
+ vm_object_paging_begin(m_object);
+
+ assert(written_on_object == VM_OBJECT_NULL);
+ written_on_object = m_object;
+ written_on_pager = m_object->pager;
+ written_on_offset = m_object->paging_offset + m->vmp_offset;
+ }
PAGE_WAKEUP_DONE(m);
- vm_fault_cleanup(m->object, top_page);
- } else
- vm_fault_cleanup(object, top_page);
+ vm_fault_cleanup(m_object, top_page);
+ } else {
+ vm_fault_cleanup(object, top_page);
+ }
vm_object_deallocate(object);
-#undef RELEASE_PAGE
+#undef RELEASE_PAGE
- kr = KERN_SUCCESS;
done:
thread_interrupt_level(interruptible_state);
- KERNEL_DEBUG_CONSTANT((MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_END,
- (int)((uint64_t)vaddr >> 32),
- (int)vaddr,
- kr,
- type_of_fault,
- 0);
+ if (resilient_media_object != VM_OBJECT_NULL) {
+ assert(resilient_media_retry);
+ assert(resilient_media_offset != (vm_object_offset_t)-1);
+ /* release extra reference on failed object */
+// printf("FBDP %s:%d resilient_media_object %p deallocate\n", __FUNCTION__, __LINE__, resilient_media_object);
+ vm_object_deallocate(resilient_media_object);
+ resilient_media_object = VM_OBJECT_NULL;
+ resilient_media_offset = (vm_object_offset_t)-1;
+ resilient_media_retry = FALSE;
+ }
+ assert(!resilient_media_retry);
+
+ /*
+ * Only I/O throttle on faults which cause a pagein/swapin.
+ */
+ if ((type_of_fault == DBG_PAGEIND_FAULT) || (type_of_fault == DBG_PAGEINV_FAULT) || (type_of_fault == DBG_COMPRESSOR_SWAPIN_FAULT)) {
+ throttle_lowpri_io(1);
+ } else {
+ if (kr == KERN_SUCCESS && type_of_fault != DBG_CACHE_HIT_FAULT && type_of_fault != DBG_GUARD_FAULT) {
+ if ((throttle_delay = vm_page_throttled(TRUE))) {
+ if (vm_debug_events) {
+ if (type_of_fault == DBG_COMPRESSOR_FAULT) {
+ VM_DEBUG_EVENT(vmf_compressordelay, VMF_COMPRESSORDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
+ } else if (type_of_fault == DBG_COW_FAULT) {
+ VM_DEBUG_EVENT(vmf_cowdelay, VMF_COWDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
+ } else {
+ VM_DEBUG_EVENT(vmf_zfdelay, VMF_ZFDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
+ }
+ }
+ delay(throttle_delay);
+ }
+ }
+ }
+
+ if (written_on_object) {
+ vnode_pager_dirtied(written_on_pager, written_on_offset, written_on_offset + PAGE_SIZE_64);
+
+ vm_object_lock(written_on_object);
+ vm_object_paging_end(written_on_object);
+ vm_object_unlock(written_on_object);
- return (kr);
+ written_on_object = VM_OBJECT_NULL;
+ }
+
+ if (rtfault) {
+ vm_record_rtfault(cthread, fstart, trace_vaddr, type_of_fault);
+ }
+
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_END,
+ ((uint64_t)trace_vaddr >> 32),
+ trace_vaddr,
+ kr,
+ vm_fault_type_for_tracing(need_copy_on_read, type_of_fault),
+ 0);
+
+ if (fault_page_size < PAGE_SIZE && kr != KERN_SUCCESS) {
+ DEBUG4K_FAULT("map %p original %p vaddr 0x%llx -> 0x%x\n", map, original_map, (uint64_t)trace_real_vaddr, kr);
+ }
+
+ return kr;
}
/*
*/
kern_return_t
vm_fault_wire(
- vm_map_t map,
- vm_map_entry_t entry,
- pmap_t pmap,
- vm_map_offset_t pmap_addr)
+ vm_map_t map,
+ vm_map_entry_t entry,
+ vm_prot_t prot,
+ vm_tag_t wire_tag,
+ pmap_t pmap,
+ vm_map_offset_t pmap_addr,
+ ppnum_t *physpage_p)
{
-
- register vm_map_offset_t va;
- register vm_map_offset_t end_addr = entry->vme_end;
- register kern_return_t rc;
+ vm_map_offset_t va;
+ vm_map_offset_t end_addr = entry->vme_end;
+ kern_return_t rc;
+ vm_map_size_t effective_page_size;
assert(entry->in_transition);
- if ((entry->object.vm_object != NULL) &&
- !entry->is_sub_map &&
- entry->object.vm_object->phys_contiguous) {
+ if ((VME_OBJECT(entry) != NULL) &&
+ !entry->is_sub_map &&
+ VME_OBJECT(entry)->phys_contiguous) {
return KERN_SUCCESS;
}
* page tables and such can be locked down as well.
*/
- pmap_pageable(pmap, pmap_addr,
- pmap_addr + (end_addr - entry->vme_start), FALSE);
+ pmap_pageable(pmap, pmap_addr,
+ pmap_addr + (end_addr - entry->vme_start), FALSE);
/*
* We simulate a fault to get the page and enter it
* in the physical map.
*/
- for (va = entry->vme_start; va < end_addr; va += PAGE_SIZE) {
- if ((rc = vm_fault_wire_fast(
- map, va, entry, pmap,
- pmap_addr + (va - entry->vme_start)
- )) != KERN_SUCCESS) {
- rc = vm_fault(map, va, VM_PROT_NONE, TRUE,
- (pmap == kernel_pmap) ?
- THREAD_UNINT : THREAD_ABORTSAFE,
- pmap, pmap_addr + (va - entry->vme_start));
+ effective_page_size = MIN(VM_MAP_PAGE_SIZE(map), PAGE_SIZE);
+ for (va = entry->vme_start;
+ va < end_addr;
+ va += effective_page_size) {
+ rc = vm_fault_wire_fast(map, va, prot, wire_tag, entry, pmap,
+ pmap_addr + (va - entry->vme_start),
+ physpage_p);
+ if (rc != KERN_SUCCESS) {
+ rc = vm_fault_internal(map, va, prot, TRUE, wire_tag,
+ ((pmap == kernel_pmap)
+ ? THREAD_UNINT
+ : THREAD_ABORTSAFE),
+ pmap,
+ (pmap_addr +
+ (va - entry->vme_start)),
+ physpage_p);
DTRACE_VM2(softlock, int, 1, (uint64_t *), NULL);
}
if (rc != KERN_SUCCESS) {
- struct vm_map_entry tmp_entry = *entry;
+ struct vm_map_entry tmp_entry = *entry;
/* unwire wired pages */
tmp_entry.vme_end = va;
- vm_fault_unwire(map,
- &tmp_entry, FALSE, pmap, pmap_addr);
+ vm_fault_unwire(map,
+ &tmp_entry, FALSE, pmap, pmap_addr);
return rc;
}
*/
void
vm_fault_unwire(
- vm_map_t map,
- vm_map_entry_t entry,
- boolean_t deallocate,
- pmap_t pmap,
- vm_map_offset_t pmap_addr)
+ vm_map_t map,
+ vm_map_entry_t entry,
+ boolean_t deallocate,
+ pmap_t pmap,
+ vm_map_offset_t pmap_addr)
{
- register vm_map_offset_t va;
- register vm_map_offset_t end_addr = entry->vme_end;
- vm_object_t object;
- struct vm_object_fault_info fault_info;
+ vm_map_offset_t va;
+ vm_map_offset_t end_addr = entry->vme_end;
+ vm_object_t object;
+ struct vm_object_fault_info fault_info = {};
+ unsigned int unwired_pages;
+ vm_map_size_t effective_page_size;
- object = (entry->is_sub_map)
- ? VM_OBJECT_NULL : entry->object.vm_object;
+ object = (entry->is_sub_map) ? VM_OBJECT_NULL : VME_OBJECT(entry);
/*
* If it's marked phys_contiguous, then vm_fault_wire() didn't actually
* anything to undo here.
*/
- if (object != VM_OBJECT_NULL && object->phys_contiguous)
+ if (object != VM_OBJECT_NULL && object->phys_contiguous) {
return;
+ }
fault_info.interruptible = THREAD_UNINT;
fault_info.behavior = entry->behavior;
- fault_info.user_tag = entry->alias;
- fault_info.lo_offset = entry->offset;
- fault_info.hi_offset = (entry->vme_end - entry->vme_start) + entry->offset;
+ fault_info.user_tag = VME_ALIAS(entry);
+ if (entry->iokit_acct ||
+ (!entry->is_sub_map && !entry->use_pmap)) {
+ fault_info.pmap_options |= PMAP_OPTIONS_ALT_ACCT;
+ }
+ fault_info.lo_offset = VME_OFFSET(entry);
+ fault_info.hi_offset = (entry->vme_end - entry->vme_start) + VME_OFFSET(entry);
fault_info.no_cache = entry->no_cache;
fault_info.stealth = TRUE;
- fault_info.io_sync = FALSE;
- fault_info.cs_bypass = FALSE;
- fault_info.mark_zf_absent = FALSE;
+
+ unwired_pages = 0;
/*
* Since the pages are wired down, we must be able to
* get their mappings from the physical map system.
*/
- for (va = entry->vme_start; va < end_addr; va += PAGE_SIZE) {
-
+ effective_page_size = MIN(VM_MAP_PAGE_SIZE(map), PAGE_SIZE);
+ for (va = entry->vme_start;
+ va < end_addr;
+ va += effective_page_size) {
if (object == VM_OBJECT_NULL) {
if (pmap) {
- pmap_change_wiring(pmap,
- pmap_addr + (va - entry->vme_start), FALSE);
+ pmap_change_wiring(pmap,
+ pmap_addr + (va - entry->vme_start), FALSE);
}
- (void) vm_fault(map, va, VM_PROT_NONE,
- TRUE, THREAD_UNINT, pmap, pmap_addr);
+ (void) vm_fault(map, va, VM_PROT_NONE,
+ TRUE, VM_KERN_MEMORY_NONE, THREAD_UNINT, pmap, pmap_addr);
} else {
- vm_prot_t prot;
- vm_page_t result_page;
- vm_page_t top_page;
- vm_object_t result_object;
+ vm_prot_t prot;
+ vm_page_t result_page;
+ vm_page_t top_page;
+ vm_object_t result_object;
vm_fault_return_t result;
- if (end_addr - va > (vm_size_t) -1) {
- /* 32-bit overflow */
- fault_info.cluster_size = (vm_size_t) (0 - PAGE_SIZE);
- } else {
- fault_info.cluster_size = (vm_size_t) (end_addr - va);
- assert(fault_info.cluster_size == end_addr - va);
+ /* cap cluster size at maximum UPL size */
+ upl_size_t cluster_size;
+ if (os_sub_overflow(end_addr, va, &cluster_size)) {
+ cluster_size = 0 - (upl_size_t)PAGE_SIZE;
}
+ fault_info.cluster_size = cluster_size;
do {
prot = VM_PROT_NONE;
vm_object_lock(object);
vm_object_paging_begin(object);
- XPR(XPR_VM_FAULT,
- "vm_fault_unwire -> vm_fault_page\n",
- 0,0,0,0,0);
- result = vm_fault_page(
+ result_page = VM_PAGE_NULL;
+ result = vm_fault_page(
object,
- entry->offset + (va - entry->vme_start),
+ (VME_OFFSET(entry) +
+ (va - entry->vme_start)),
VM_PROT_NONE, TRUE,
+ FALSE, /* page not looked up */
&prot, &result_page, &top_page,
(int *)0,
- NULL, map->no_zero_fill,
+ NULL, map->no_zero_fill,
FALSE, &fault_info);
} while (result == VM_FAULT_RETRY);
* move on to the next one in case the remaining pages are mapped from
* different objects. During a forced unmount, the object is terminated
* so the alive flag will be false if this happens. A forced unmount will
- * will occur when an external disk is unplugged before the user does an
+ * will occur when an external disk is unplugged before the user does an
* eject, so we don't want to panic in that situation.
*/
- if (result == VM_FAULT_MEMORY_ERROR && !object->alive)
+ if (result == VM_FAULT_MEMORY_ERROR && !object->alive) {
+ continue;
+ }
+
+ if (result == VM_FAULT_MEMORY_ERROR &&
+ object == kernel_object) {
+ /*
+ * This must have been allocated with
+ * KMA_KOBJECT and KMA_VAONLY and there's
+ * no physical page at this offset.
+ * We're done (no page to free).
+ */
+ assert(deallocate);
continue;
+ }
- if (result != VM_FAULT_SUCCESS)
+ if (result != VM_FAULT_SUCCESS) {
panic("vm_fault_unwire: failure");
+ }
- result_object = result_page->object;
+ result_object = VM_PAGE_OBJECT(result_page);
if (deallocate) {
- assert(result_page->phys_page !=
- vm_page_fictitious_addr);
- pmap_disconnect(result_page->phys_page);
+ assert(VM_PAGE_GET_PHYS_PAGE(result_page) !=
+ vm_page_fictitious_addr);
+ pmap_disconnect(VM_PAGE_GET_PHYS_PAGE(result_page));
+ if (VM_PAGE_WIRED(result_page)) {
+ unwired_pages++;
+ }
VM_PAGE_FREE(result_page);
} else {
- if ((pmap) && (result_page->phys_page != vm_page_guard_addr))
- pmap_change_wiring(pmap,
+ if ((pmap) && (VM_PAGE_GET_PHYS_PAGE(result_page) != vm_page_guard_addr)) {
+ pmap_change_wiring(pmap,
pmap_addr + (va - entry->vme_start), FALSE);
+ }
if (VM_PAGE_WIRED(result_page)) {
vm_page_lockspin_queues();
vm_page_unwire(result_page, TRUE);
vm_page_unlock_queues();
+ unwired_pages++;
}
- if(entry->zero_wired_pages) {
- pmap_zero_page(result_page->phys_page);
+ if (entry->zero_wired_pages) {
+ pmap_zero_page(VM_PAGE_GET_PHYS_PAGE(result_page));
entry->zero_wired_pages = FALSE;
}
* such may be unwired themselves.
*/
- pmap_pageable(pmap, pmap_addr,
- pmap_addr + (end_addr - entry->vme_start), TRUE);
+ pmap_pageable(pmap, pmap_addr,
+ pmap_addr + (end_addr - entry->vme_start), TRUE);
+ if (kernel_object == object) {
+ /*
+ * Would like to make user_tag in vm_object_fault_info
+ * vm_tag_t (unsigned short) but user_tag derives its value from
+ * VME_ALIAS(entry) at a few places and VME_ALIAS, in turn, casts
+ * to an _unsigned int_ which is used by non-fault_info paths throughout the
+ * code at many places.
+ *
+ * So, for now, an explicit truncation to unsigned short (vm_tag_t).
+ */
+ assertf((fault_info.user_tag & VME_ALIAS_MASK) == fault_info.user_tag,
+ "VM Tag truncated from 0x%x to 0x%x\n", fault_info.user_tag, (fault_info.user_tag & VME_ALIAS_MASK));
+ vm_tag_update_size((vm_tag_t) fault_info.user_tag, -ptoa_64(unwired_pages));
+ }
}
/*
* other than the common case will return KERN_FAILURE, and the caller
* is expected to call vm_fault().
*/
-kern_return_t
+static kern_return_t
vm_fault_wire_fast(
- __unused vm_map_t map,
- vm_map_offset_t va,
- vm_map_entry_t entry,
- pmap_t pmap,
- vm_map_offset_t pmap_addr)
+ __unused vm_map_t map,
+ vm_map_offset_t va,
+ __unused vm_prot_t caller_prot,
+ vm_tag_t wire_tag,
+ vm_map_entry_t entry,
+ pmap_t pmap,
+ vm_map_offset_t pmap_addr,
+ ppnum_t *physpage_p)
{
- vm_object_t object;
- vm_object_offset_t offset;
- register vm_page_t m;
- vm_prot_t prot;
- thread_t thread = current_thread();
- int type_of_fault;
- kern_return_t kr;
+ vm_object_t object;
+ vm_object_offset_t offset;
+ vm_page_t m;
+ vm_prot_t prot;
+ thread_t thread = current_thread();
+ int type_of_fault;
+ kern_return_t kr;
+ vm_map_size_t fault_page_size;
+ vm_map_offset_t fault_phys_offset;
+ struct vm_object_fault_info fault_info = {};
VM_STAT_INCR(faults);
- if (thread != THREAD_NULL && thread->task != TASK_NULL)
- thread->task->faults++;
+ if (thread != THREAD_NULL && thread->task != TASK_NULL) {
+ thread->task->faults++;
+ }
/*
* Recovery actions
*/
-#undef RELEASE_PAGE
-#define RELEASE_PAGE(m) { \
- PAGE_WAKEUP_DONE(m); \
- vm_page_lockspin_queues(); \
- vm_page_unwire(m, TRUE); \
- vm_page_unlock_queues(); \
+#undef RELEASE_PAGE
+#define RELEASE_PAGE(m) { \
+ PAGE_WAKEUP_DONE(m); \
+ vm_page_lockspin_queues(); \
+ vm_page_unwire(m, TRUE); \
+ vm_page_unlock_queues(); \
}
-#undef UNLOCK_THINGS
-#define UNLOCK_THINGS { \
- vm_object_paging_end(object); \
- vm_object_unlock(object); \
+#undef UNLOCK_THINGS
+#define UNLOCK_THINGS { \
+ vm_object_paging_end(object); \
+ vm_object_unlock(object); \
}
-#undef UNLOCK_AND_DEALLOCATE
-#define UNLOCK_AND_DEALLOCATE { \
- UNLOCK_THINGS; \
- vm_object_deallocate(object); \
+#undef UNLOCK_AND_DEALLOCATE
+#define UNLOCK_AND_DEALLOCATE { \
+ UNLOCK_THINGS; \
+ vm_object_deallocate(object); \
}
/*
* Give up and have caller do things the hard way.
*/
-#define GIVE_UP { \
- UNLOCK_AND_DEALLOCATE; \
- return(KERN_FAILURE); \
+#define GIVE_UP { \
+ UNLOCK_AND_DEALLOCATE; \
+ return(KERN_FAILURE); \
}
/*
* If this entry is not directly to a vm_object, bail out.
*/
- if (entry->is_sub_map)
- return(KERN_FAILURE);
+ if (entry->is_sub_map) {
+ assert(physpage_p == NULL);
+ return KERN_FAILURE;
+ }
/*
* Find the backing store object and offset into it.
*/
- object = entry->object.vm_object;
- offset = (va - entry->vme_start) + entry->offset;
+ object = VME_OBJECT(entry);
+ offset = (va - entry->vme_start) + VME_OFFSET(entry);
prot = entry->protection;
- /*
+ /*
* Make a reference to this object to prevent its
* disposal while we are messing with it.
*/
/*
* Look for page in top-level object. If it's not there or
* there's something going on, give up.
- * ENCRYPTED SWAP: use the slow fault path, since we'll need to
- * decrypt the page before wiring it down.
*/
- m = vm_page_lookup(object, offset);
- if ((m == VM_PAGE_NULL) || (m->busy) || (m->encrypted) ||
- (m->unusual && ( m->error || m->restart || m->absent))) {
-
+ m = vm_page_lookup(object, vm_object_trunc_page(offset));
+ if ((m == VM_PAGE_NULL) || (m->vmp_busy) ||
+ (m->vmp_unusual && (m->vmp_error || m->vmp_restart || m->vmp_absent))) {
GIVE_UP;
}
- ASSERT_PAGE_DECRYPTED(m);
-
- if (m->fictitious &&
- m->phys_page == vm_page_guard_addr) {
+ if (m->vmp_fictitious &&
+ VM_PAGE_GET_PHYS_PAGE(m) == vm_page_guard_addr) {
/*
* Guard pages are fictitious pages and are never
* entered into a pmap, so let's say it's been wired...
/*
* Wire the page down now. All bail outs beyond this
- * point must unwire the page.
+ * point must unwire the page.
*/
vm_page_lockspin_queues();
- vm_page_wire(m);
+ vm_page_wire(m, wire_tag, TRUE);
vm_page_unlock_queues();
/*
* Mark page busy for other threads.
*/
- assert(!m->busy);
- m->busy = TRUE;
- assert(!m->absent);
+ assert(!m->vmp_busy);
+ m->vmp_busy = TRUE;
+ assert(!m->vmp_absent);
/*
* Give up if the page is being written and there's a copy object
GIVE_UP;
}
+ fault_info.user_tag = VME_ALIAS(entry);
+ fault_info.pmap_options = 0;
+ if (entry->iokit_acct ||
+ (!entry->is_sub_map && !entry->use_pmap)) {
+ fault_info.pmap_options |= PMAP_OPTIONS_ALT_ACCT;
+ }
+
+ fault_page_size = MIN(VM_MAP_PAGE_SIZE(map), PAGE_SIZE);
+ fault_phys_offset = offset - vm_object_trunc_page(offset);
+
/*
* Put this page into the physical map.
*/
type_of_fault = DBG_CACHE_HIT_FAULT;
kr = vm_fault_enter(m,
- pmap,
- pmap_addr,
- prot,
- prot,
- TRUE,
- FALSE,
- FALSE,
- FALSE,
- &type_of_fault);
+ pmap,
+ pmap_addr,
+ fault_page_size,
+ fault_phys_offset,
+ prot,
+ prot,
+ TRUE, /* wired */
+ FALSE, /* change_wiring */
+ wire_tag,
+ &fault_info,
+ NULL,
+ &type_of_fault);
+ if (kr != KERN_SUCCESS) {
+ RELEASE_PAGE(m);
+ GIVE_UP;
+ }
done:
/*
* Unlock everything, and return
*/
+ if (physpage_p) {
+ /* for vm_map_wire_and_extract() */
+ if (kr == KERN_SUCCESS) {
+ assert(object == VM_PAGE_OBJECT(m));
+ *physpage_p = VM_PAGE_GET_PHYS_PAGE(m);
+ if (prot & VM_PROT_WRITE) {
+ vm_object_lock_assert_exclusive(object);
+ m->vmp_dirty = TRUE;
+ }
+ } else {
+ *physpage_p = 0;
+ }
+ }
+
PAGE_WAKEUP_DONE(m);
UNLOCK_AND_DEALLOCATE;
return kr;
-
}
/*
* Release a page used by vm_fault_copy.
*/
-void
+static void
vm_fault_copy_cleanup(
- vm_page_t page,
- vm_page_t top_page)
+ vm_page_t page,
+ vm_page_t top_page)
{
- vm_object_t object = page->object;
+ vm_object_t object = VM_PAGE_OBJECT(page);
vm_object_lock(object);
PAGE_WAKEUP_DONE(page);
- if (!page->active && !page->inactive && !page->throttled) {
+ if (!VM_PAGE_PAGEABLE(page)) {
vm_page_lockspin_queues();
- if (!page->active && !page->inactive && !page->throttled)
+ if (!VM_PAGE_PAGEABLE(page)) {
vm_page_activate(page);
+ }
vm_page_unlock_queues();
}
vm_fault_cleanup(object, top_page);
}
-void
+static void
vm_fault_copy_dst_cleanup(
- vm_page_t page)
+ vm_page_t page)
{
- vm_object_t object;
+ vm_object_t object;
if (page != VM_PAGE_NULL) {
- object = page->object;
+ object = VM_PAGE_OBJECT(page);
vm_object_lock(object);
vm_page_lockspin_queues();
vm_page_unwire(page, TRUE);
vm_page_unlock_queues();
- vm_object_paging_end(object);
+ vm_object_paging_end(object);
vm_object_unlock(object);
}
}
*/
kern_return_t
vm_fault_copy(
- vm_object_t src_object,
- vm_object_offset_t src_offset,
- vm_map_size_t *copy_size, /* INOUT */
- vm_object_t dst_object,
- vm_object_offset_t dst_offset,
- vm_map_t dst_map,
- vm_map_version_t *dst_version,
- int interruptible)
+ vm_object_t src_object,
+ vm_object_offset_t src_offset,
+ vm_map_size_t *copy_size, /* INOUT */
+ vm_object_t dst_object,
+ vm_object_offset_t dst_offset,
+ vm_map_t dst_map,
+ vm_map_version_t *dst_version,
+ int interruptible)
{
- vm_page_t result_page;
-
- vm_page_t src_page;
- vm_page_t src_top_page;
- vm_prot_t src_prot;
+ vm_page_t result_page;
+
+ vm_page_t src_page;
+ vm_page_t src_top_page;
+ vm_prot_t src_prot;
- vm_page_t dst_page;
- vm_page_t dst_top_page;
- vm_prot_t dst_prot;
+ vm_page_t dst_page;
+ vm_page_t dst_top_page;
+ vm_prot_t dst_prot;
- vm_map_size_t amount_left;
- vm_object_t old_copy_object;
- kern_return_t error = 0;
- vm_fault_return_t result;
+ vm_map_size_t amount_left;
+ vm_object_t old_copy_object;
+ vm_object_t result_page_object = NULL;
+ kern_return_t error = 0;
+ vm_fault_return_t result;
- vm_map_size_t part_size;
- struct vm_object_fault_info fault_info_src;
- struct vm_object_fault_info fault_info_dst;
+ vm_map_size_t part_size;
+ struct vm_object_fault_info fault_info_src = {};
+ struct vm_object_fault_info fault_info_dst = {};
/*
* In order not to confuse the clustered pageins, align
* the different offsets on a page boundary.
*/
-#define RETURN(x) \
- MACRO_BEGIN \
- *copy_size -= amount_left; \
- MACRO_RETURN(x); \
+#define RETURN(x) \
+ MACRO_BEGIN \
+ *copy_size -= amount_left; \
+ MACRO_RETURN(x); \
MACRO_END
amount_left = *copy_size;
fault_info_src.interruptible = interruptible;
fault_info_src.behavior = VM_BEHAVIOR_SEQUENTIAL;
- fault_info_src.user_tag = 0;
fault_info_src.lo_offset = vm_object_trunc_page(src_offset);
fault_info_src.hi_offset = fault_info_src.lo_offset + amount_left;
- fault_info_src.no_cache = FALSE;
fault_info_src.stealth = TRUE;
- fault_info_src.io_sync = FALSE;
- fault_info_src.cs_bypass = FALSE;
- fault_info_src.mark_zf_absent = FALSE;
fault_info_dst.interruptible = interruptible;
fault_info_dst.behavior = VM_BEHAVIOR_SEQUENTIAL;
- fault_info_dst.user_tag = 0;
fault_info_dst.lo_offset = vm_object_trunc_page(dst_offset);
fault_info_dst.hi_offset = fault_info_dst.lo_offset + amount_left;
- fault_info_dst.no_cache = FALSE;
fault_info_dst.stealth = TRUE;
- fault_info_dst.io_sync = FALSE;
- fault_info_dst.cs_bypass = FALSE;
- fault_info_dst.mark_zf_absent = FALSE;
do { /* while (amount_left > 0) */
/*
* COW semantics if any.
*/
- RetryDestinationFault: ;
+RetryDestinationFault:;
- dst_prot = VM_PROT_WRITE|VM_PROT_READ;
+ dst_prot = VM_PROT_WRITE | VM_PROT_READ;
vm_object_lock(dst_object);
vm_object_paging_begin(dst_object);
- if (amount_left > (vm_size_t) -1) {
- /* 32-bit overflow */
- fault_info_dst.cluster_size = (vm_size_t) (0 - PAGE_SIZE);
- } else {
- fault_info_dst.cluster_size = (vm_size_t) amount_left;
- assert(fault_info_dst.cluster_size == amount_left);
+ /* cap cluster size at maximum UPL size */
+ upl_size_t cluster_size;
+ if (os_convert_overflow(amount_left, &cluster_size)) {
+ cluster_size = 0 - (upl_size_t)PAGE_SIZE;
}
+ fault_info_dst.cluster_size = cluster_size;
- XPR(XPR_VM_FAULT,"vm_fault_copy -> vm_fault_page\n",0,0,0,0,0);
+ dst_page = VM_PAGE_NULL;
result = vm_fault_page(dst_object,
- vm_object_trunc_page(dst_offset),
- VM_PROT_WRITE|VM_PROT_READ,
- FALSE,
- &dst_prot, &dst_page, &dst_top_page,
- (int *)0,
- &error,
- dst_map->no_zero_fill,
- FALSE, &fault_info_dst);
+ vm_object_trunc_page(dst_offset),
+ VM_PROT_WRITE | VM_PROT_READ,
+ FALSE,
+ FALSE, /* page not looked up */
+ &dst_prot, &dst_page, &dst_top_page,
+ (int *)0,
+ &error,
+ dst_map->no_zero_fill,
+ FALSE, &fault_info_dst);
switch (result) {
case VM_FAULT_SUCCESS:
break;
case VM_FAULT_RETRY:
goto RetryDestinationFault;
case VM_FAULT_MEMORY_SHORTAGE:
- if (vm_page_wait(interruptible))
+ if (vm_page_wait(interruptible)) {
goto RetryDestinationFault;
- /* fall thru */
+ }
+ OS_FALLTHROUGH;
case VM_FAULT_INTERRUPTED:
RETURN(MACH_SEND_INTERRUPTED);
case VM_FAULT_SUCCESS_NO_VM_PAGE:
/* success but no VM page: fail the copy */
vm_object_paging_end(dst_object);
vm_object_unlock(dst_object);
- /*FALLTHROUGH*/
+ OS_FALLTHROUGH;
case VM_FAULT_MEMORY_ERROR:
- if (error)
- return (error);
- else
- return(KERN_MEMORY_ERROR);
+ if (error) {
+ return error;
+ } else {
+ return KERN_MEMORY_ERROR;
+ }
default:
panic("vm_fault_copy: unexpected error 0x%x from "
- "vm_fault_page()\n", result);
+ "vm_fault_page()\n", result);
}
- assert ((dst_prot & VM_PROT_WRITE) != VM_PROT_NONE);
+ assert((dst_prot & VM_PROT_WRITE) != VM_PROT_NONE);
- old_copy_object = dst_page->object->copy;
+ assert(dst_object == VM_PAGE_OBJECT(dst_page));
+ old_copy_object = dst_object->copy;
/*
* There exists the possiblity that the source and
* same, the call to vm_fault_page() for the
* destination page will deadlock. To prevent this we
* wire the page so we can drop busy without having
- * the page daemon steal the page. We clean up the
+ * the page daemon steal the page. We clean up the
* top page but keep the paging reference on the object
* holding the dest page so it doesn't go away.
*/
vm_page_lockspin_queues();
- vm_page_wire(dst_page);
+ vm_page_wire(dst_page, VM_KERN_MEMORY_OSFMK, TRUE);
vm_page_unlock_queues();
PAGE_WAKEUP_DONE(dst_page);
- vm_object_unlock(dst_page->object);
+ vm_object_unlock(dst_object);
if (dst_top_page != VM_PAGE_NULL) {
vm_object_lock(dst_object);
vm_object_unlock(dst_object);
}
- RetrySourceFault: ;
+RetrySourceFault:;
if (src_object == VM_OBJECT_NULL) {
/*
} else {
vm_object_lock(src_object);
src_page = vm_page_lookup(src_object,
- vm_object_trunc_page(src_offset));
+ vm_object_trunc_page(src_offset));
if (src_page == dst_page) {
src_prot = dst_prot;
result_page = VM_PAGE_NULL;
src_prot = VM_PROT_READ;
vm_object_paging_begin(src_object);
- if (amount_left > (vm_size_t) -1) {
- /* 32-bit overflow */
- fault_info_src.cluster_size = (vm_size_t) (0 - PAGE_SIZE);
- } else {
- fault_info_src.cluster_size = (vm_size_t) amount_left;
- assert(fault_info_src.cluster_size == amount_left);
+ /* cap cluster size at maximum UPL size */
+ if (os_convert_overflow(amount_left, &cluster_size)) {
+ cluster_size = 0 - (upl_size_t)PAGE_SIZE;
}
+ fault_info_src.cluster_size = cluster_size;
- XPR(XPR_VM_FAULT,
- "vm_fault_copy(2) -> vm_fault_page\n",
- 0,0,0,0,0);
+ result_page = VM_PAGE_NULL;
result = vm_fault_page(
- src_object,
+ src_object,
vm_object_trunc_page(src_offset),
VM_PROT_READ, FALSE,
- &src_prot,
+ FALSE, /* page not looked up */
+ &src_prot,
&result_page, &src_top_page,
(int *)0, &error, FALSE,
FALSE, &fault_info_src);
case VM_FAULT_RETRY:
goto RetrySourceFault;
case VM_FAULT_MEMORY_SHORTAGE:
- if (vm_page_wait(interruptible))
+ if (vm_page_wait(interruptible)) {
goto RetrySourceFault;
- /* fall thru */
+ }
+ OS_FALLTHROUGH;
case VM_FAULT_INTERRUPTED:
vm_fault_copy_dst_cleanup(dst_page);
RETURN(MACH_SEND_INTERRUPTED);
/* success but no VM page: fail */
vm_object_paging_end(src_object);
vm_object_unlock(src_object);
- /*FALLTHROUGH*/
+ OS_FALLTHROUGH;
case VM_FAULT_MEMORY_ERROR:
vm_fault_copy_dst_cleanup(dst_page);
- if (error)
- return (error);
- else
- return(KERN_MEMORY_ERROR);
+ if (error) {
+ return error;
+ } else {
+ return KERN_MEMORY_ERROR;
+ }
default:
panic("vm_fault_copy(2): unexpected "
- "error 0x%x from "
- "vm_fault_page()\n", result);
+ "error 0x%x from "
+ "vm_fault_page()\n", result);
}
-
+ result_page_object = VM_PAGE_OBJECT(result_page);
assert((src_top_page == VM_PAGE_NULL) ==
- (result_page->object == src_object));
+ (result_page_object == src_object));
}
- assert ((src_prot & VM_PROT_READ) != VM_PROT_NONE);
- vm_object_unlock(result_page->object);
+ assert((src_prot & VM_PROT_READ) != VM_PROT_NONE);
+ vm_object_unlock(result_page_object);
}
+ vm_map_lock_read(dst_map);
+
if (!vm_map_verify(dst_map, dst_version)) {
- if (result_page != VM_PAGE_NULL && src_page != dst_page)
+ vm_map_unlock_read(dst_map);
+ if (result_page != VM_PAGE_NULL && src_page != dst_page) {
vm_fault_copy_cleanup(result_page, src_top_page);
+ }
vm_fault_copy_dst_cleanup(dst_page);
break;
}
+ assert(dst_object == VM_PAGE_OBJECT(dst_page));
- vm_object_lock(dst_page->object);
+ vm_object_lock(dst_object);
- if (dst_page->object->copy != old_copy_object) {
- vm_object_unlock(dst_page->object);
- vm_map_verify_done(dst_map, dst_version);
- if (result_page != VM_PAGE_NULL && src_page != dst_page)
+ if (dst_object->copy != old_copy_object) {
+ vm_object_unlock(dst_object);
+ vm_map_unlock_read(dst_map);
+ if (result_page != VM_PAGE_NULL && src_page != dst_page) {
vm_fault_copy_cleanup(result_page, src_top_page);
+ }
vm_fault_copy_dst_cleanup(dst_page);
break;
}
- vm_object_unlock(dst_page->object);
+ vm_object_unlock(dst_object);
/*
* Copy the page, and note that it is dirty
*/
if (!page_aligned(src_offset) ||
- !page_aligned(dst_offset) ||
- !page_aligned(amount_left)) {
-
- vm_object_offset_t src_po,
- dst_po;
+ !page_aligned(dst_offset) ||
+ !page_aligned(amount_left)) {
+ vm_object_offset_t src_po,
+ dst_po;
src_po = src_offset - vm_object_trunc_page(src_offset);
dst_po = dst_offset - vm_object_trunc_page(dst_offset);
} else {
part_size = PAGE_SIZE - src_po;
}
- if (part_size > (amount_left)){
+ if (part_size > (amount_left)) {
part_size = amount_left;
}
assert((vm_offset_t) dst_po == dst_po);
assert((vm_size_t) part_size == part_size);
vm_page_part_zero_fill(dst_page,
- (vm_offset_t) dst_po,
- (vm_size_t) part_size);
+ (vm_offset_t) dst_po,
+ (vm_size_t) part_size);
} else {
assert((vm_offset_t) src_po == src_po);
assert((vm_offset_t) dst_po == dst_po);
assert((vm_size_t) part_size == part_size);
vm_page_part_copy(result_page,
- (vm_offset_t) src_po,
- dst_page,
- (vm_offset_t) dst_po,
- (vm_size_t)part_size);
- if(!dst_page->dirty){
+ (vm_offset_t) src_po,
+ dst_page,
+ (vm_offset_t) dst_po,
+ (vm_size_t)part_size);
+ if (!dst_page->vmp_dirty) {
vm_object_lock(dst_object);
- dst_page->dirty = TRUE;
- vm_object_unlock(dst_page->object);
+ SET_PAGE_DIRTY(dst_page, TRUE);
+ vm_object_unlock(dst_object);
}
-
}
} else {
part_size = PAGE_SIZE;
- if (result_page == VM_PAGE_NULL)
+ if (result_page == VM_PAGE_NULL) {
vm_page_zero_fill(dst_page);
- else{
+ } else {
+ vm_object_lock(result_page_object);
vm_page_copy(result_page, dst_page);
- if(!dst_page->dirty){
+ vm_object_unlock(result_page_object);
+
+ if (!dst_page->vmp_dirty) {
vm_object_lock(dst_object);
- dst_page->dirty = TRUE;
- vm_object_unlock(dst_page->object);
+ SET_PAGE_DIRTY(dst_page, TRUE);
+ vm_object_unlock(dst_object);
}
}
-
}
/*
* Unlock everything, and return
*/
- vm_map_verify_done(dst_map, dst_version);
+ vm_map_unlock_read(dst_map);
- if (result_page != VM_PAGE_NULL && src_page != dst_page)
+ if (result_page != VM_PAGE_NULL && src_page != dst_page) {
vm_fault_copy_cleanup(result_page, src_top_page);
+ }
vm_fault_copy_dst_cleanup(dst_page);
amount_left -= part_size;
} while (amount_left > 0);
RETURN(KERN_SUCCESS);
-#undef RETURN
+#undef RETURN
- /*NOTREACHED*/
+ /*NOTREACHED*/
}
-#if VM_FAULT_CLASSIFY
+#if VM_FAULT_CLASSIFY
/*
* Temporary statistics gathering support.
*/
/*
* Statistics arrays:
*/
-#define VM_FAULT_TYPES_MAX 5
-#define VM_FAULT_LEVEL_MAX 8
+#define VM_FAULT_TYPES_MAX 5
+#define VM_FAULT_LEVEL_MAX 8
-int vm_fault_stats[VM_FAULT_TYPES_MAX][VM_FAULT_LEVEL_MAX];
+int vm_fault_stats[VM_FAULT_TYPES_MAX][VM_FAULT_LEVEL_MAX];
-#define VM_FAULT_TYPE_ZERO_FILL 0
-#define VM_FAULT_TYPE_MAP_IN 1
-#define VM_FAULT_TYPE_PAGER 2
-#define VM_FAULT_TYPE_COPY 3
-#define VM_FAULT_TYPE_OTHER 4
+#define VM_FAULT_TYPE_ZERO_FILL 0
+#define VM_FAULT_TYPE_MAP_IN 1
+#define VM_FAULT_TYPE_PAGER 2
+#define VM_FAULT_TYPE_COPY 3
+#define VM_FAULT_TYPE_OTHER 4
void
-vm_fault_classify(vm_object_t object,
- vm_object_offset_t offset,
- vm_prot_t fault_type)
+vm_fault_classify(vm_object_t object,
+ vm_object_offset_t offset,
+ vm_prot_t fault_type)
{
- int type, level = 0;
- vm_page_t m;
+ int type, level = 0;
+ vm_page_t m;
while (TRUE) {
m = vm_page_lookup(object, offset);
- if (m != VM_PAGE_NULL) {
- if (m->busy || m->error || m->restart || m->absent) {
+ if (m != VM_PAGE_NULL) {
+ if (m->vmp_busy || m->vmp_error || m->vmp_restart || m->vmp_absent) {
type = VM_FAULT_TYPE_OTHER;
break;
}
if (((fault_type & VM_PROT_WRITE) == 0) ||
((level == 0) && object->copy == VM_OBJECT_NULL)) {
type = VM_FAULT_TYPE_MAP_IN;
- break;
+ break;
}
type = VM_FAULT_TYPE_COPY;
break;
- }
- else {
+ } else {
if (object->pager_created) {
type = VM_FAULT_TYPE_PAGER;
break;
if (object->shadow == VM_OBJECT_NULL) {
type = VM_FAULT_TYPE_ZERO_FILL;
break;
- }
+ }
offset += object->vo_shadow_offset;
object = object->shadow;
}
}
- if (level > VM_FAULT_LEVEL_MAX)
+ if (level > VM_FAULT_LEVEL_MAX) {
level = VM_FAULT_LEVEL_MAX;
+ }
vm_fault_stats[type][level] += 1;
return;
}
-#endif /* VM_FAULT_CLASSIFY */
+#endif /* VM_FAULT_CLASSIFY */
+vm_offset_t
+kdp_lightweight_fault(vm_map_t map, vm_offset_t cur_target_addr)
+{
+ vm_map_entry_t entry;
+ vm_object_t object;
+ vm_offset_t object_offset;
+ vm_page_t m;
+ int compressor_external_state, compressed_count_delta;
+ int compressor_flags = (C_DONT_BLOCK | C_KEEP | C_KDP);
+ int my_fault_type = VM_PROT_READ;
+ kern_return_t kr;
+ int effective_page_mask, effective_page_size;
+
+ if (VM_MAP_PAGE_SHIFT(map) < PAGE_SHIFT) {
+ effective_page_mask = VM_MAP_PAGE_MASK(map);
+ effective_page_size = VM_MAP_PAGE_SIZE(map);
+ } else {
+ effective_page_mask = PAGE_MASK;
+ effective_page_size = PAGE_SIZE;
+ }
-extern int cs_validation;
+ if (not_in_kdp) {
+ panic("kdp_lightweight_fault called from outside of debugger context");
+ }
-void
-vm_page_validate_cs_mapped(
- vm_page_t page,
- const void *kaddr)
-{
- vm_object_t object;
- vm_object_offset_t offset;
- kern_return_t kr;
- memory_object_t pager;
- void *blobs;
- boolean_t validated, tainted;
+ assert(map != VM_MAP_NULL);
- assert(page->busy);
- vm_object_lock_assert_exclusive(page->object);
+ assert((cur_target_addr & effective_page_mask) == 0);
+ if ((cur_target_addr & effective_page_mask) != 0) {
+ return 0;
+ }
- if (!cs_validation) {
- return;
+ if (kdp_lck_rw_lock_is_acquired_exclusive(&map->lock)) {
+ return 0;
+ }
+
+ if (!vm_map_lookup_entry(map, cur_target_addr, &entry)) {
+ return 0;
+ }
+
+ if (entry->is_sub_map) {
+ return 0;
+ }
+
+ object = VME_OBJECT(entry);
+ if (object == VM_OBJECT_NULL) {
+ return 0;
+ }
+
+ object_offset = cur_target_addr - entry->vme_start + VME_OFFSET(entry);
+
+ while (TRUE) {
+ if (kdp_lck_rw_lock_is_acquired_exclusive(&object->Lock)) {
+ return 0;
+ }
+
+ if (object->pager_created && (object->paging_in_progress ||
+ object->activity_in_progress)) {
+ return 0;
+ }
+
+ m = kdp_vm_page_lookup(object, vm_object_trunc_page(object_offset));
+
+ if (m != VM_PAGE_NULL) {
+ if ((object->wimg_bits & VM_WIMG_MASK) != VM_WIMG_DEFAULT) {
+ return 0;
+ }
+
+ if (m->vmp_laundry || m->vmp_busy || m->vmp_free_when_done || m->vmp_absent || m->vmp_error || m->vmp_cleaning ||
+ m->vmp_overwriting || m->vmp_restart || m->vmp_unusual) {
+ return 0;
+ }
+
+ assert(!m->vmp_private);
+ if (m->vmp_private) {
+ return 0;
+ }
+
+ assert(!m->vmp_fictitious);
+ if (m->vmp_fictitious) {
+ return 0;
+ }
+
+ assert(m->vmp_q_state != VM_PAGE_USED_BY_COMPRESSOR);
+ if (m->vmp_q_state == VM_PAGE_USED_BY_COMPRESSOR) {
+ return 0;
+ }
+
+ return ptoa(VM_PAGE_GET_PHYS_PAGE(m));
+ }
+
+ compressor_external_state = VM_EXTERNAL_STATE_UNKNOWN;
+
+ if (object->pager_created && MUST_ASK_PAGER(object, object_offset, compressor_external_state)) {
+ if (compressor_external_state == VM_EXTERNAL_STATE_EXISTS) {
+ kr = vm_compressor_pager_get(object->pager,
+ vm_object_trunc_page(object_offset + object->paging_offset),
+ kdp_compressor_decompressed_page_ppnum, &my_fault_type,
+ compressor_flags, &compressed_count_delta);
+ if (kr == KERN_SUCCESS) {
+ return kdp_compressor_decompressed_page_paddr;
+ } else {
+ return 0;
+ }
+ }
+ }
+
+ if (object->shadow == VM_OBJECT_NULL) {
+ return 0;
+ }
+
+ object_offset += object->vo_shadow_offset;
+ object = object->shadow;
}
+}
- if (page->wpmapped && !page->cs_tainted) {
+/*
+ * vm_page_validate_cs_fast():
+ * Performs a few quick checks to determine if the page's code signature
+ * really needs to be fully validated. It could:
+ * 1. have been modified (i.e. automatically tainted),
+ * 2. have already been validated,
+ * 3. have already been found to be tainted,
+ * 4. no longer have a backing store.
+ * Returns FALSE if the page needs to be fully validated.
+ */
+static boolean_t
+vm_page_validate_cs_fast(
+ vm_page_t page,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset)
+{
+ vm_object_t object;
+
+ object = VM_PAGE_OBJECT(page);
+ vm_object_lock_assert_held(object);
+
+ if (page->vmp_wpmapped &&
+ !VMP_CS_TAINTED(page, fault_page_size, fault_phys_offset)) {
/*
* This page was mapped for "write" access sometime in the
* past and could still be modifiable in the future.
* [ If the page was already found to be "tainted", no
* need to re-validate. ]
*/
- page->cs_validated = TRUE;
- page->cs_tainted = TRUE;
+ vm_object_lock_assert_exclusive(object);
+ VMP_CS_SET_VALIDATED(page, fault_page_size, fault_phys_offset, TRUE);
+ VMP_CS_SET_TAINTED(page, fault_page_size, fault_phys_offset, TRUE);
if (cs_debug) {
- printf("CODESIGNING: vm_page_validate_cs: "
- "page %p obj %p off 0x%llx "
- "was modified\n",
- page, page->object, page->offset);
+ printf("CODESIGNING: %s: "
+ "page %p obj %p off 0x%llx "
+ "was modified\n",
+ __FUNCTION__,
+ page, object, page->vmp_offset);
}
vm_cs_validated_dirtied++;
}
- if (page->cs_validated) {
- return;
+ if (VMP_CS_VALIDATED(page, fault_page_size, fault_phys_offset) ||
+ VMP_CS_TAINTED(page, fault_page_size, fault_phys_offset)) {
+ return TRUE;
}
+ vm_object_lock_assert_exclusive(object);
- vm_cs_validates++;
+#if CHECK_CS_VALIDATION_BITMAP
+ kern_return_t kr;
- object = page->object;
- assert(object->code_signed);
- offset = page->offset;
+ kr = vnode_pager_cs_check_validation_bitmap(
+ object->pager,
+ page->vmp_offset + object->paging_offset,
+ CS_BITMAP_CHECK);
+ if (kr == KERN_SUCCESS) {
+ page->vmp_cs_validated = VMP_CS_ALL_TRUE;
+ page->vmp_cs_tainted = VMP_CS_ALL_FALSE;
+ vm_cs_bitmap_validated++;
+ return TRUE;
+ }
+#endif /* CHECK_CS_VALIDATION_BITMAP */
if (!object->alive || object->terminating || object->pager == NULL) {
/*
* The object is terminating and we don't have its pager
* so we can't validate the data...
*/
- return;
+ return TRUE;
}
+
+ /* we need to really validate this page */
+ vm_object_lock_assert_exclusive(object);
+ return FALSE;
+}
+
+void
+vm_page_validate_cs_mapped_slow(
+ vm_page_t page,
+ const void *kaddr)
+{
+ vm_object_t object;
+ memory_object_offset_t mo_offset;
+ memory_object_t pager;
+ struct vnode *vnode;
+ int validated, tainted, nx;
+
+ assert(page->vmp_busy);
+ object = VM_PAGE_OBJECT(page);
+ vm_object_lock_assert_exclusive(object);
+
+ vm_cs_validates++;
+
/*
* Since we get here to validate a page that was brought in by
* the pager, we know that this pager is all setup and ready
* by now.
*/
+ assert(object->code_signed);
assert(!object->internal);
assert(object->pager != NULL);
assert(object->pager_ready);
pager = object->pager;
assert(object->paging_in_progress);
- kr = vnode_pager_get_object_cs_blobs(pager, &blobs);
- if (kr != KERN_SUCCESS) {
- blobs = NULL;
- }
+ vnode = vnode_pager_lookup_vnode(pager);
+ mo_offset = page->vmp_offset + object->paging_offset;
/* verify the SHA1 hash for this page */
- validated = cs_validate_page(blobs,
- offset + object->paging_offset,
- (const void *)kaddr,
- &tainted);
-
- page->cs_validated = validated;
- if (validated) {
- page->cs_tainted = tainted;
+ validated = 0;
+ tainted = 0;
+ nx = 0;
+ cs_validate_page(vnode,
+ pager,
+ mo_offset,
+ (const void *)((const char *)kaddr),
+ &validated,
+ &tainted,
+ &nx);
+
+ page->vmp_cs_validated |= validated;
+ page->vmp_cs_tainted |= tainted;
+ page->vmp_cs_nx |= nx;
+
+#if CHECK_CS_VALIDATION_BITMAP
+ if (page->vmp_cs_validated == VMP_CS_ALL_TRUE &&
+ page->vmp_cs_tainted == VMP_CS_ALL_FALSE) {
+ vnode_pager_cs_check_validation_bitmap(object->pager,
+ mo_offset,
+ CS_BITMAP_SET);
}
+#endif /* CHECK_CS_VALIDATION_BITMAP */
}
void
-vm_page_validate_cs(
- vm_page_t page)
+vm_page_validate_cs_mapped(
+ vm_page_t page,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset,
+ const void *kaddr)
{
- vm_object_t object;
- vm_object_offset_t offset;
- vm_map_offset_t koffset;
- vm_map_size_t ksize;
- vm_offset_t kaddr;
- kern_return_t kr;
- boolean_t busy_page;
-
- vm_object_lock_assert_held(page->object);
-
- if (!cs_validation) {
- return;
- }
-
- if (page->wpmapped && !page->cs_tainted) {
- vm_object_lock_assert_exclusive(page->object);
-
- /*
- * This page was mapped for "write" access sometime in the
- * past and could still be modifiable in the future.
- * Consider it tainted.
- * [ If the page was already found to be "tainted", no
- * need to re-validate. ]
- */
- page->cs_validated = TRUE;
- page->cs_tainted = TRUE;
- if (cs_debug) {
- printf("CODESIGNING: vm_page_validate_cs: "
- "page %p obj %p off 0x%llx "
- "was modified\n",
- page, page->object, page->offset);
- }
- vm_cs_validated_dirtied++;
- }
-
- if (page->cs_validated) {
- return;
+ if (!vm_page_validate_cs_fast(page, fault_page_size, fault_phys_offset)) {
+ vm_page_validate_cs_mapped_slow(page, kaddr);
}
+}
-#if CHECK_CS_VALIDATION_BITMAP
- if ( vnode_pager_cs_check_validation_bitmap( page->object->pager, trunc_page(page->offset + page->object->paging_offset), CS_BITMAP_CHECK ) == KERN_SUCCESS) {
- page->cs_validated = TRUE;
- page->cs_tainted = FALSE;
- vm_cs_bitmap_validated++;
+void
+vm_page_validate_cs(
+ vm_page_t page,
+ vm_map_size_t fault_page_size,
+ vm_map_offset_t fault_phys_offset)
+{
+ vm_object_t object;
+ vm_object_offset_t offset;
+ vm_map_offset_t koffset;
+ vm_map_size_t ksize;
+ vm_offset_t kaddr;
+ kern_return_t kr;
+ boolean_t busy_page;
+ boolean_t need_unmap;
+
+ object = VM_PAGE_OBJECT(page);
+ vm_object_lock_assert_held(object);
+
+ if (vm_page_validate_cs_fast(page, fault_page_size, fault_phys_offset)) {
return;
}
-#endif
- vm_object_lock_assert_exclusive(page->object);
+ vm_object_lock_assert_exclusive(object);
- object = page->object;
assert(object->code_signed);
- offset = page->offset;
+ offset = page->vmp_offset;
- busy_page = page->busy;
+ busy_page = page->vmp_busy;
if (!busy_page) {
/* keep page busy while we map (and unlock) the VM object */
- page->busy = TRUE;
+ page->vmp_busy = TRUE;
}
-
+
/*
* Take a paging reference on the VM object
* to protect it from collapse or bypass,
vm_object_paging_begin(object);
/* map the page in the kernel address space */
- koffset = 0;
ksize = PAGE_SIZE_64;
- kr = vm_paging_map_object(&koffset,
- page,
- object,
- offset,
- &ksize,
- VM_PROT_READ,
- FALSE); /* can't unlock object ! */
+ koffset = 0;
+ need_unmap = FALSE;
+ kr = vm_paging_map_object(page,
+ object,
+ offset,
+ VM_PROT_READ,
+ FALSE, /* can't unlock object ! */
+ &ksize,
+ &koffset,
+ &need_unmap);
if (kr != KERN_SUCCESS) {
- panic("vm_page_validate_cs: could not map page: 0x%x\n", kr);
+ panic("%s: could not map page: 0x%x\n", __FUNCTION__, kr);
}
kaddr = CAST_DOWN(vm_offset_t, koffset);
/* validate the mapped page */
- vm_page_validate_cs_mapped(page, (const void *) kaddr);
+ vm_page_validate_cs_mapped_slow(page, (const void *) kaddr);
-#if CHECK_CS_VALIDATION_BITMAP
- if ( page->cs_validated == TRUE && page->cs_tainted == FALSE ) {
- vnode_pager_cs_check_validation_bitmap( object->pager, trunc_page( offset + object->paging_offset), CS_BITMAP_SET );
- }
-#endif
- assert(page->busy);
- assert(object == page->object);
+ assert(page->vmp_busy);
+ assert(object == VM_PAGE_OBJECT(page));
vm_object_lock_assert_exclusive(object);
if (!busy_page) {
PAGE_WAKEUP_DONE(page);
}
- if (koffset != 0) {
+ if (need_unmap) {
/* unmap the map from the kernel address space */
vm_paging_unmap_object(object, koffset, koffset + ksize);
koffset = 0;
}
vm_object_paging_end(object);
}
+
+void
+vm_page_validate_cs_mapped_chunk(
+ vm_page_t page,
+ const void *kaddr,
+ vm_offset_t chunk_offset,
+ vm_size_t chunk_size,
+ boolean_t *validated_p,
+ unsigned *tainted_p)
+{
+ vm_object_t object;
+ vm_object_offset_t offset, offset_in_page;
+ memory_object_t pager;
+ struct vnode *vnode;
+ boolean_t validated;
+ unsigned tainted;
+
+ *validated_p = FALSE;
+ *tainted_p = 0;
+
+ assert(page->vmp_busy);
+ object = VM_PAGE_OBJECT(page);
+ vm_object_lock_assert_exclusive(object);
+
+ assert(object->code_signed);
+ offset = page->vmp_offset;
+
+ if (!object->alive || object->terminating || object->pager == NULL) {
+ /*
+ * The object is terminating and we don't have its pager
+ * so we can't validate the data...
+ */
+ return;
+ }
+ /*
+ * Since we get here to validate a page that was brought in by
+ * the pager, we know that this pager is all setup and ready
+ * by now.
+ */
+ assert(!object->internal);
+ assert(object->pager != NULL);
+ assert(object->pager_ready);
+
+ pager = object->pager;
+ assert(object->paging_in_progress);
+ vnode = vnode_pager_lookup_vnode(pager);
+
+ /* verify the signature for this chunk */
+ offset_in_page = chunk_offset;
+ assert(offset_in_page < PAGE_SIZE);
+
+ tainted = 0;
+ validated = cs_validate_range(vnode,
+ pager,
+ (object->paging_offset +
+ offset +
+ offset_in_page),
+ (const void *)((const char *)kaddr
+ + offset_in_page),
+ chunk_size,
+ &tainted);
+ if (validated) {
+ *validated_p = TRUE;
+ }
+ if (tainted) {
+ *tainted_p = tainted;
+ }
+}
+
+static void
+vm_rtfrecord_lock(void)
+{
+ lck_spin_lock(&vm_rtfr_slock);
+}
+
+static void
+vm_rtfrecord_unlock(void)
+{
+ lck_spin_unlock(&vm_rtfr_slock);
+}
+
+unsigned int
+vmrtfaultinfo_bufsz(void)
+{
+ return vmrtf_num_records * sizeof(vm_rtfault_record_t);
+}
+
+#include <kern/backtrace.h>
+
+__attribute__((noinline))
+static void
+vm_record_rtfault(thread_t cthread, uint64_t fstart, vm_map_offset_t fault_vaddr, int type_of_fault)
+{
+ uint64_t fend = mach_continuous_time();
+
+ uint64_t cfpc = 0;
+ uint64_t ctid = cthread->thread_id;
+ uint64_t cupid = get_current_unique_pid();
+
+ uintptr_t bpc = 0;
+ int btr = 0;
+ bool u64 = false;
+
+ /* Capture a single-frame backtrace; this extracts just the program
+ * counter at the point of the fault into "bpc", and should perform no
+ * further user stack traversals, thus avoiding copyin()s and further
+ * faults.
+ */
+ unsigned int bfrs = backtrace_thread_user(cthread, &bpc, 1U, &btr, &u64, NULL, false);
+
+ if ((btr == 0) && (bfrs > 0)) {
+ cfpc = bpc;
+ }
+
+ assert((fstart != 0) && fend >= fstart);
+ vm_rtfrecord_lock();
+ assert(vmrtfrs.vmrtfr_curi <= vmrtfrs.vmrtfr_maxi);
+
+ vmrtfrs.vmrtf_total++;
+ vm_rtfault_record_t *cvmr = &vmrtfrs.vm_rtf_records[vmrtfrs.vmrtfr_curi++];
+
+ cvmr->rtfabstime = fstart;
+ cvmr->rtfduration = fend - fstart;
+ cvmr->rtfaddr = fault_vaddr;
+ cvmr->rtfpc = cfpc;
+ cvmr->rtftype = type_of_fault;
+ cvmr->rtfupid = cupid;
+ cvmr->rtftid = ctid;
+
+ if (vmrtfrs.vmrtfr_curi > vmrtfrs.vmrtfr_maxi) {
+ vmrtfrs.vmrtfr_curi = 0;
+ }
+
+ vm_rtfrecord_unlock();
+}
+
+int
+vmrtf_extract(uint64_t cupid, __unused boolean_t isroot, unsigned long vrecordsz, void *vrecords, unsigned long *vmrtfrv)
+{
+ vm_rtfault_record_t *cvmrd = vrecords;
+ size_t residue = vrecordsz;
+ size_t numextracted = 0;
+ boolean_t early_exit = FALSE;
+
+ vm_rtfrecord_lock();
+
+ for (int vmfi = 0; vmfi <= vmrtfrs.vmrtfr_maxi; vmfi++) {
+ if (residue < sizeof(vm_rtfault_record_t)) {
+ early_exit = TRUE;
+ break;
+ }
+
+ if (vmrtfrs.vm_rtf_records[vmfi].rtfupid != cupid) {
+#if DEVELOPMENT || DEBUG
+ if (isroot == FALSE) {
+ continue;
+ }
+#else
+ continue;
+#endif /* DEVDEBUG */
+ }
+
+ *cvmrd = vmrtfrs.vm_rtf_records[vmfi];
+ cvmrd++;
+ residue -= sizeof(vm_rtfault_record_t);
+ numextracted++;
+ }
+
+ vm_rtfrecord_unlock();
+
+ *vmrtfrv = numextracted;
+ return early_exit;
+}
projects / apple / xnu.git / blobdiff