* Copyright (c) 2000-2009 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/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/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_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>
#include <sys/codesign.h>
+#include <sys/reason.h>
+#include <sys/signalvar.h>
-#include <libsa/sys/timers.h> /* for struct timespec */
+#include <san/kasan.h>
-#define VM_FAULT_CLASSIFY 0
+#define VM_FAULT_CLASSIFY 0
#define TRACEFAULTPAGE 0 /* (TEST/DEBUG) */
-int vm_object_pagein_throttle = 16;
+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
extern void throttle_lowpri_io(int);
+extern struct vnode *vnode_pager_lookup_vnode(memory_object_t);
+
uint64_t vm_hard_throttle_threshold;
-#define NEED_TO_HARD_THROTTLE_THIS_TASK() ((current_task() != kernel_task && \
- get_task_resident_size(current_task()) > (((AVAILABLE_NON_COMPRESSED_MEMORY) * PAGE_SIZE) / 5)) && \
- (vm_low_on_space() || (vm_page_free_count < vm_page_throttle_limit && \
- proc_get_effective_thread_policy(current_thread(), TASK_POLICY_IO) >= THROTTLE_LEVEL_THROTTLED )))
+#define NEED_TO_HARD_THROTTLE_THIS_TASK() (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 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
-#define HARD_THROTTLE_DELAY 20000 /* 20000 us == 20 ms */
-#define SOFT_THROTTLE_DELAY 2000 /* 2000 us == 2 ms */
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_cs_query_modified = 0;
unsigned long vm_cs_validated_dirtied = 0;
unsigned long vm_cs_bitmap_validated = 0;
+#if PMAP_CS
+uint64_t vm_cs_defer_to_pmap_cs = 0;
+uint64_t vm_cs_defer_to_pmap_cs_not = 0;
+#endif /* PMAP_CS */
+
+void vm_pre_fault(vm_map_offset_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))
+int vmrtf_num_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);
+
+lck_spin_t vm_rtfr_slock;
+extern lck_grp_t vm_page_lck_grp_bucket;
+extern lck_attr_t vm_page_lck_attr;
/*
* Routine: vm_fault_init
* 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 > 0 &&
- ((vm_compressor_temp & ( 1 << i)) == vm_compressor_temp)) {
+ 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 > 0 &&
+ ((vm_compressor_temp & (1 << i)) == vm_compressor_temp)) {
need_default_val = FALSE;
vm_compressor_mode = vm_compressor_temp;
break;
}
}
- if (need_default_val)
+ 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));
}
- PE_parse_boot_argn("vm_compressor_threads", &vm_compressor_thread_count, sizeof (vm_compressor_thread_count));
printf("\"vm_compressor_mode\" is %d\n", vm_compressor_mode);
}
+void
+vm_rtfault_record_init(void)
+{
+ PE_parse_boot_argn("vm_rtfault_records", &vmrtf_num_records, sizeof(vmrtf_num_records));
+
+ assert(vmrtf_num_records >= 1);
+ vmrtf_num_records = MAX(vmrtf_num_records, 1);
+ size_t kallocsz = vmrtf_num_records * sizeof(vm_rtfault_record_t);
+ vmrtfrs.vm_rtf_records = kalloc(kallocsz);
+ bzero(vmrtfrs.vm_rtf_records, kallocsz);
+ vmrtfrs.vmrtfr_maxi = vmrtf_num_records - 1;
+ lck_spin_init(&vm_rtfr_slock, &vm_page_lck_grp_bucket, &vm_page_lck_attr);
+}
/*
* Routine: vm_fault_cleanup
* Purpose:
*/
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);
+ 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;
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) {
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->laundry && !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;
/*
* 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(m->phys_page, VM_MEM_REFERENCED, PMAP_OPTIONS_NOFLUSH, (void *)NULL);
+ 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 (thread->t_page_creation_throttled) {
+ thread->t_page_creation_throttled = 0;
- if (NEED_TO_HARD_THROTTLE_THIS_TASK())
- return (HARD_THROTTLE_DELAY);
+ 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 || ((COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) && SWAPPER_NEEDS_TO_UNTHROTTLE())) &&
- thread->t_page_creation_count > vm_page_creation_throttle) {
-
+ 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);
- if ((COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) && HARD_THROTTLE_LIMIT_REACHED())
- return (HARD_THROTTLE_DELAY);
- else
- 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);
-
- thread_block(THREAD_CONTINUE_NULL);
- thread_interrupt_level(interruptible_state);
-
- return (VM_FAULT_RETRY);
- }
- }
- 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);
+ VM_DEBUG_EVENT(vmf_check_zfdelay, VMF_CHECK_ZFDELAY, DBG_FUNC_NONE, throttle_delay, 0, 0, 0);
- delay(throttle_delay);
+ delay(throttle_delay);
- if (current_thread_aborted()) {
+ if (current_thread_aborted()) {
+ thread_interrupt_level(interruptible_state);
+ return VM_FAULT_INTERRUPTED;
+ }
thread_interrupt_level(interruptible_state);
- return VM_FAULT_INTERRUPTED;
- }
- thread_interrupt_level(interruptible_state);
- return (VM_FAULT_MEMORY_SHORTAGE);
+ return VM_FAULT_MEMORY_SHORTAGE;
+ }
}
- return (VM_FAULT_SUCCESS);
+ return VM_FAULT_SUCCESS;
}
* 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->vmp_pmapped = TRUE;
- m->cs_validated = FALSE;
- m->cs_tainted = FALSE;
+ m->vmp_cs_validated = FALSE;
+ m->vmp_cs_tainted = FALSE;
+ m->vmp_cs_nx = FALSE;
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();
- if (!VM_DYNAMIC_PAGING_ENABLED(memory_manager_default)) {
+ if (!VM_DYNAMIC_PAGING_ENABLED()) {
assert(!VM_PAGE_WIRED(m));
/*
* can't be on the pageout queue since we don't
* have a pager to try and clean to
*/
- assert(!m->pageout_queue);
-
- VM_PAGE_QUEUES_REMOVE(m);
-
- queue_enter(&vm_page_queue_throttled, m, vm_page_t, pageq);
- m->throttled = TRUE;
+ 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++;
}
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.
*/
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? */
- boolean_t caller_lookup, /* caller looked up page */
+ 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_page_t *result_page, /* Page found, if successful */
+ vm_prot_t *protection, /* Protection for mapping */
+ vm_page_t *result_page, /* Page found, if successful */
/* Returns: */
- 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 */
- boolean_t data_supply, /* treat as data_supply if
- * it is a write fault and a full
- * page is provided */
+ 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;
- boolean_t force_fault_retry = FALSE;
- 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;
- 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;
+ 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, s) \
- ((vm_external_state_get((o)->existence_map, (f)) \
- != VM_EXTERNAL_STATE_ABSENT) && \
- (s = (VM_COMPRESSOR_PAGER_STATE_GET((o), (f)))) \
- != VM_EXTERNAL_STATE_ABSENT)
-#define PAGED_OUT(o, f) \
- ((vm_external_state_get((o)->existence_map, (f)) \
- == VM_EXTERNAL_STATE_EXISTS) || \
- (VM_COMPRESSOR_PAGER_STATE_GET((o), (f)) \
- == VM_EXTERNAL_STATE_EXISTS))
-#else /* MACH_PAGEMAP */
-#define MUST_ASK_PAGER(o, f, s) \
+#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)
-#endif /* MACH_PAGEMAP */
/*
* 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) { \
- if (COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) \
- vm_page_deactivate(m); \
- else \
- 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
interruptible = fault_info->interruptible;
interruptible_state = thread_interrupt_level(interruptible);
-
+
/*
* INVARIANTS (through entire routine):
*
XPR(XPR_VM_FAULT,
- "vm_f_page: obj 0x%X, offset 0x%X, type %d, prot %d\n",
- object, offset, fault_type, *protection, 0);
+ "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) {
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);
m = vm_page_lookup(object, 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.
*/
#if TRACEFAULTPAGE
- dbgTrace(0xBEEF0005, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
+ dbgTrace(0xBEEF0005, (unsigned int) m, (unsigned int) 0); /* (TEST/DEBUG) */
#endif
wait_result = PAGE_SLEEP(object, m, interruptible);
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;
}
- if (m->laundry) {
- m->pageout = FALSE;
+ if (m->vmp_laundry) {
+ m->vmp_free_when_done = FALSE;
- if (!m->cleaning)
+ if (!m->vmp_cleaning) {
vm_pageout_steal_laundry(m, FALSE);
+ }
}
- if (m->phys_page == vm_page_guard_addr) {
+ 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);
+ 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);
+ object, offset,
+ m,
+ first_object, 0);
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();
-
- assert(!m->pageout_queue);
- 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);
+ 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);
+ 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);
- 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();
- if (m->speculative)
- 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);
+ object, offset, m, 0, 0);
+ 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
*/
+
if (must_be_resident) {
if (fault_type == VM_PROT_NONE &&
object == kernel_object) {
goto dont_look_for_page;
}
-#if !MACH_PAGEMAP
+ /* Don't expect to fault pages into the kernel object. */
+ assert(object != kernel_object);
+
data_supply = FALSE;
-#endif /* !MACH_PAGEMAP */
- look_for_page = (object->pager_created && (MUST_ASK_PAGER(object, offset, external_state) == TRUE) && !data_supply);
-
+ 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 && !object->phys_contiguous) {
/*
* 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, offset, FALSE, TRUE, TRUE);
+ vm_page_insert_internal(m, object, offset, VM_KERN_MEMORY_NONE, FALSE, TRUE, TRUE, FALSE, NULL);
} else {
vm_page_insert(m, object, offset);
}
}
if (look_for_page) {
- kern_return_t rc;
- int my_fault_type;
+ 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);
+ 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);
+ "vm_f_page: ready wait obj 0x%X, offset 0x%X\n",
+ object, offset, 0, 0, 0);
/*
* 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 ((COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) && object->internal) {
+ 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();
+ 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;
}
- m->absent = TRUE;
+ m->vmp_absent = TRUE;
if (fault_info && fault_info->batch_pmap_op == TRUE) {
- vm_page_insert_internal(m, object, offset, FALSE, TRUE, TRUE);
+ vm_page_insert_internal(m, object, offset, VM_KERN_MEMORY_NONE, FALSE, TRUE, TRUE, FALSE, NULL);
} else {
vm_page_insert(m, object, offset);
}
}
- assert(m->busy);
-
- m->absent = TRUE;
+ 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, m->phys_page, &my_fault_type, 0);
+ 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->absent = FALSE;
- m->dirty = TRUE;
- if ((m->object->wimg_bits &
- VM_WIMG_MASK) !=
+ 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,
* after the decompression.
*/
pmap_sync_page_attributes_phys(
- m->phys_page);
- } else
- m->written_by_kernel = TRUE;
+ 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->unusual = TRUE;
- m->error = TRUE;
- m->absent = FALSE;
+ m->vmp_unusual = TRUE;
+ m->vmp_error = TRUE;
+ m->vmp_absent = FALSE;
break;
case KERN_MEMORY_ERROR:
- assert(m->absent);
+ assert(m->vmp_absent);
break;
default:
- panic("?");
+ panic("vm_fault_page(): unexpected "
+ "error %d from "
+ "vm_compressor_pager_get()\n",
+ rc);
}
PAGE_WAKEUP_DONE(m);
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;
+ }
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);
+ object, offset, m,
+ access_required | wants_copy_flag, 0);
if (object->copy == first_object) {
/*
* the fault w/o having to go through memory_object_data_request again
*/
assert(first_m != VM_PAGE_NULL);
- assert(first_m->object == first_object);
-
+ assert(VM_PAGE_OBJECT(first_m) == first_object);
+
vm_object_lock(first_object);
VM_PAGE_FREE(first_m);
vm_object_paging_end(first_object);
if (data_already_requested == TRUE) {
fault_info->behavior = orig_behavior;
fault_info->cluster_size = orig_cluster_size;
- } else
+ } 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);
- data_requested:
- 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;
}
}
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);
+ return VM_FAULT_INTERRUPTED;
}
if (force_fault_retry == TRUE) {
-
vm_fault_cleanup(object, first_m);
thread_interrupt_level(interruptible_state);
- return (VM_FAULT_RETRY);
+ 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;
}
/*
}
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);
+ 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);
}
+ 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);
+ (first_m->vmp_busy && !first_m->vmp_absent &&
+ !first_m->vmp_active && !first_m->vmp_inactive && !first_m->vmp_secluded));
+#endif /* EXTRA_ASSERTIONS */
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);
+ object, offset, m,
+ first_object, first_m);
/*
* 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);
+ 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.
*/
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);
+ assert(copy_m->vmp_busy);
vm_page_insert(copy_m, object, offset);
SET_PAGE_DIRTY(copy_m, TRUE);
* 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_paging_end(object);
vm_object_collapse(object, 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;
*/
copy_offset = first_offset - copy_object->vo_shadow_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();
SET_PAGE_DIRTY(copy_m, TRUE);
PAGE_WAKEUP_DONE(copy_m);
+ } else {
+ assert(copy_m->vmp_busy == TRUE);
+ assert(!m->vmp_cleaning);
- } else if (copy_object->internal &&
- (DEFAULT_PAGER_IS_ACTIVE || DEFAULT_FREEZER_IS_ACTIVE)) {
/*
- * For internal objects check with the pager to see
- * if the page already exists in the backing store.
- * If yes, then we can drop the copy page. If not,
- * then we'll activate it, mark it dirty and keep it
- * around.
+ * dirty is protected by the object lock
*/
-
- kern_return_t kr = KERN_SUCCESS;
-
- memory_object_t copy_pager = copy_object->pager;
- assert(copy_pager != MEMORY_OBJECT_NULL);
- vm_object_paging_begin(copy_object);
-
- vm_object_unlock(copy_object);
-
- kr = memory_object_data_request(
- copy_pager,
- copy_offset + copy_object->paging_offset,
- 0, /* Only query the pager. */
- VM_PROT_READ,
- NULL);
-
- vm_object_lock(copy_object);
+ SET_PAGE_DIRTY(copy_m, TRUE);
- vm_object_paging_end(copy_object);
+ /*
+ * The page is already ready for pageout:
+ * not on pageout queues and busy.
+ * Unlock everything except the
+ * copy_object itself.
+ */
+ vm_object_unlock(object);
/*
- * Since we dropped the copy_object's lock,
- * check whether we'll have to deallocate
- * the hard way.
- */
- if ((copy_object->shadow != object) || (copy_object->ref_count == 1)) {
- vm_object_unlock(copy_object);
- vm_object_deallocate(copy_object);
- vm_object_lock(object);
-
- continue;
- }
- if (kr == KERN_SUCCESS) {
- /*
- * The pager has the page. We don't want to overwrite
- * that page by sending this one out to the backing store.
- * So we drop the copy page.
- */
- VM_PAGE_FREE(copy_m);
-
- } else {
- /*
- * The pager doesn't have the page. We'll keep this one
- * around in the copy object. It might get sent out to
- * the backing store under memory pressure.
- */
- vm_page_lockspin_queues();
- assert(!m->cleaning);
- vm_page_activate(copy_m);
- vm_page_unlock_queues();
-
- SET_PAGE_DIRTY(copy_m, TRUE);
- PAGE_WAKEUP_DONE(copy_m);
- }
- } else {
-
- assert(copy_m->busy == TRUE);
- assert(!m->cleaning);
-
- /*
- * dirty is protected by the object lock
- */
- SET_PAGE_DIRTY(copy_m, TRUE);
-
- /*
- * The page is already ready for pageout:
- * not on pageout queues and busy.
- * Unlock everything except the
- * copy_object itself.
- */
- vm_object_unlock(object);
-
- /*
- * Write the page to the copy-object,
- * flushing it from the kernel.
+ * Write the page to the copy-object,
+ * flushing it from the kernel.
*/
vm_pageout_initialize_page(copy_m);
* 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;
*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);
+ "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) {
- if (!m->object->internal || (DEFAULT_PAGER_IS_ACTIVE || DEFAULT_FREEZER_IS_ACTIVE))
- 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_INCR(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
}
* 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*/))
+#define VM_FAULT_NEED_CS_VALIDATION(pmap, page, page_obj) \
+ ((pmap) != kernel_pmap /*1*/ && \
+ !(page)->vmp_cs_tainted /*2*/ && \
+ (page_obj)->code_signed /*3*/ && \
+ (!(page)->vmp_cs_validated || (page)->vmp_wpmapped /*4*/ ))
/*
* page queue lock must NOT be held
- * m->object must be locked
+ * m->vmp_object must be locked
*
- * NOTE: m->object could be locked "shared" only if we are called
+ * 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...
*/
+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;
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,
- boolean_t *need_retry,
- int *type_of_fault)
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ 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, pe_result;
- boolean_t previously_pmapped = m->pmapped;
- boolean_t must_disconnect = 0;
- boolean_t map_is_switched, map_is_switch_protected;
- int cs_enforcement_enabled;
-
- 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;
+ kern_return_t kr, pe_result;
+ boolean_t previously_pmapped = m->vmp_pmapped;
+ boolean_t must_disconnect = 0;
+ boolean_t map_is_switched, map_is_switch_protected;
+ boolean_t cs_violation;
+ int cs_enforcement_enabled;
+ vm_prot_t fault_type;
+ vm_object_t object;
+ boolean_t no_cache = fault_info->no_cache;
+ boolean_t cs_bypass = fault_info->cs_bypass;
+ int pmap_options = fault_info->pmap_options;
+
+ fault_type = change_wiring ? VM_PROT_NONE : caller_prot;
+ object = VM_PAGE_OBJECT(m);
+
+ vm_object_lock_assert_held(object);
+
+#if KASAN
+ if (pmap == kernel_pmap) {
+ kasan_notify_address(vaddr, PAGE_SIZE);
}
+#endif
- if (*type_of_fault == DBG_ZERO_FILL_FAULT) {
+ LCK_MTX_ASSERT(&vm_page_queue_lock, LCK_MTX_ASSERT_NOTOWNED);
- vm_object_lock_assert_exclusive(m->object);
+ if (VM_PAGE_GET_PHYS_PAGE(m) == vm_page_guard_addr) {
+ assert(m->vmp_fictitious);
+ return KERN_SUCCESS;
+ }
- } else if ((fault_type & VM_PROT_WRITE) == 0) {
+ if (*type_of_fault == DBG_ZERO_FILL_FAULT) {
+ vm_object_lock_assert_exclusive(object);
+ } else if ((fault_type & VM_PROT_WRITE) == 0 &&
+ (!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
* 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++;
+ /* This had better not be a JIT page. */
+ if (!pmap_has_prot_policy(prot)) {
+ prot &= ~VM_PROT_WRITE;
+ } else {
+ assert(cs_bypass);
}
- VM_PAGE_CONSUME_CLUSTERED(m);
+ }
+ 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_COUNT_AS_PAGEIN(m);
+ }
+ VM_PAGE_CONSUME_CLUSTERED(m);
+ }
}
if (*type_of_fault != DBG_COW_FAULT) {
}
/* Validate code signature if necessary. */
- if (VM_FAULT_NEED_CS_VALIDATION(pmap, m)) {
- vm_object_lock_assert_exclusive(m->object);
+ if (!cs_bypass &&
+ VM_FAULT_NEED_CS_VALIDATION(pmap, m, object)) {
+ vm_object_lock_assert_exclusive(object);
- if (m->cs_validated) {
+ if (m->vmp_cs_validated) {
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 */
+
+#if PMAP_CS
+ if (fault_info->pmap_cs_associated &&
+ pmap_cs_enforced(pmap) &&
+ !m->vmp_cs_validated &&
+ !m->vmp_cs_tainted &&
+ !m->vmp_cs_nx &&
+ (prot & VM_PROT_EXECUTE) &&
+ (caller_prot & VM_PROT_EXECUTE)) {
+ /*
+ * With pmap_cs, the pmap layer will validate the
+ * code signature for any executable pmap mapping.
+ * No need for us to validate this page too:
+ * in pmap_cs we trust...
+ */
+ vm_cs_defer_to_pmap_cs++;
+ } else {
+ vm_cs_defer_to_pmap_cs_not++;
+ vm_page_validate_cs(m);
+ }
+#else /* PMAP_CS */
vm_page_validate_cs(m);
+#endif /* PMAP_CS */
}
-#define page_immutable(m,prot) ((m)->cs_validated /*&& ((prot) & VM_PROT_EXECUTE)*/)
+#define page_immutable(m, prot) ((m)->vmp_cs_validated /*&& ((prot) & VM_PROT_EXECUTE)*/ )
+#define page_nx(m) ((m)->vmp_cs_nx)
map_is_switched = ((pmap != vm_map_pmap(current_task()->map)) &&
- (pmap == vm_map_pmap(current_thread()->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.
*/
- cs_enforcement_enabled = cs_enforcement(NULL);
+ cs_enforcement_enabled = cs_process_enforcement(NULL);
+
+ if (cs_enforcement_enabled && map_is_switched &&
+ map_is_switch_protected && page_immutable(m, prot) &&
+ (prot & VM_PROT_WRITE)) {
+ return KERN_CODESIGN_ERROR;
+ }
- if(cs_enforcement_enabled && map_is_switched &&
- map_is_switch_protected && page_immutable(m, prot) &&
- (prot & VM_PROT_WRITE))
- {
+ if (cs_enforcement_enabled && page_nx(m) && (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_enabled && !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))
- ))
- )
- {
+ if (cs_bypass) {
+ /* code-signing is bypassed */
+ cs_violation = FALSE;
+ } else if (m->vmp_cs_tainted) {
+ /* tainted page */
+ cs_violation = TRUE;
+ } else if (!cs_enforcement_enabled) {
+ /* no further code-signing enforcement */
+ cs_violation = FALSE;
+ } else if (page_immutable(m, 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 (!m->vmp_cs_validated &&
+ (prot & VM_PROT_EXECUTE)
+#if PMAP_CS
+ /*
+ * Executable pages will be validated by pmap_cs;
+ * in pmap_cs we trust...
+ * If pmap_cs is turned off, this is a code-signing
+ * violation.
+ */
+ && !(pmap_cs_enforced(pmap))
+#endif /* PMAP_CS */
+ ) {
+ cs_violation = TRUE;
+ } else {
+ cs_violation = FALSE;
+ }
+
+ if (cs_violation) {
/* 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().
* 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));
+ boolean_t reject_page, cs_killed;
+ 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 slid: %s prot: 0x%x\n",
- m->object->code_signed ? "yes" : "no",
- m->cs_validated ? "yes" : "no",
- m->cs_tainted ? "yes" : "no",
- m->wpmapped ? "yes" : "no",
- m->slid ? "yes" : "no",
- (int)prot);
- reject_page = cs_invalid_page((addr64_t) vaddr);
+ if (cs_debug > 5) {
+ printf("vm_fault: signed: %s validate: %s tainted: %s wpmapped: %s prot: 0x%x\n",
+ object->code_signed ? "yes" : "no",
+ m->vmp_cs_validated ? "yes" : "no",
+ m->vmp_cs_tainted ? "yes" : "no",
+ m->vmp_wpmapped ? "yes" : "no",
+ (int)prot);
+ }
+ reject_page = cs_invalid_page((addr64_t) vaddr, &cs_killed);
}
-
+
if (reject_page) {
- /* reject the tainted 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;
+ /* 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;
+ 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++;
procname = "?";
task = current_task();
pid = proc_selfpid();
- if (task->bsd_info != NULL)
+ if (task->bsd_info != NULL) {
procname = proc_name_address(task->bsd_info);
+ }
/* get file's VM object */
- file_object = m->object;
- file_offset = m->offset;
- for (shadow = file_object->shadow;
- shadow != VM_OBJECT_NULL;
- shadow = file_object->shadow) {
+ 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 != m->object) {
+ if (file_object != object) {
vm_object_unlock(file_object);
}
file_offset += file_object->vo_shadow_offset;
pathname_len = 0;
filename_len = 0;
truncated_path = FALSE;
- if (file_object->pager == NULL) {
- /* no pager -> no file -> no pathname */
- pathname = (char *) "<nil>";
- } else {
+ /* no pager -> no file -> no pathname, use "<nil>" in that case */
+ if (file_object->pager != NULL) {
pathname = (char *)kalloc(__PATH_MAX * 2);
if (pathname) {
+ pathname[0] = '\0';
pathname_len = __PATH_MAX;
filename = pathname + pathname_len;
filename_len = __PATH_MAX;
}
vnode_pager_get_object_name(file_object->pager,
- pathname,
- pathname_len,
- filename,
- filename_len,
- &truncated_path);
+ pathname,
+ pathname_len,
+ filename,
+ filename_len,
+ &truncated_path);
+ if (pathname) {
+ /* safety first... */
+ pathname[__PATH_MAX - 1] = '\0';
+ filename[__PATH_MAX - 1] = '\0';
+ }
vnode_pager_get_object_mtime(file_object->pager,
- &mtime,
- &cs_mtime);
+ &mtime,
+ &cs_mtime);
}
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 "
- "wpmapped:%d slid:%d)\n",
- pid, procname, (addr64_t) vaddr,
- file_offset,
- pathname,
- (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,
- m->object->code_signed,
- m->cs_validated,
- m->cs_tainted,
- m->wpmapped,
- m->slid);
- if (file_object != m->object) {
+ "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,
+ m->vmp_cs_validated,
+ m->vmp_cs_tainted,
+ m->vmp_cs_nx,
+ 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);
+ 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 = (m->vmp_cs_validated);
+ ceri->ceri_page_codesig_tainted = (m->vmp_cs_tainted);
+ ceri->ceri_page_codesig_nx = (m->vmp_cs_nx);
+ 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) {
+ panic("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,
+ m->vmp_cs_validated,
+ m->vmp_cs_tainted,
+ m->vmp_cs_nx,
+ m->vmp_wpmapped,
+ m->vmp_dirty,
+ shadow_depth);
+ }
+
+ if (file_object != object) {
vm_object_unlock(file_object);
}
if (pathname_len != 0) {
filename = NULL;
}
} else {
- /* proceed with the tainted page */
+ /* proceed with the invalid 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;
+ if (!m->vmp_cs_validated &&
+ !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.
+ */
+ must_disconnect = !m->vmp_cs_tainted;
+ m->vmp_cs_tainted = TRUE;
+ }
cs_enter_tainted_accepted++;
}
if (kr != KERN_SUCCESS) {
if (cs_debug) {
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);
+ "*** INVALID PAGE ***\n",
+ (long long)vaddr);
}
#if !SECURE_KERNEL
if (cs_enforcement_panic) {
}
#endif
}
-
} else {
/* proceed with the valid page */
kr = KERN_SUCCESS;
}
- boolean_t page_queues_locked = FALSE;
-#define __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED() \
-MACRO_BEGIN \
- if (! page_queues_locked) { \
- page_queues_locked = TRUE; \
- vm_page_lockspin_queues(); \
- } \
+ boolean_t page_queues_locked = FALSE;
+#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(); \
- } \
+#define __VM_PAGE_UNLOCK_QUEUES_IF_NEEDED() \
+MACRO_BEGIN \
+ if (page_queues_locked) { \
+ page_queues_locked = FALSE; \
+ vm_page_unlock_queues(); \
+ } \
MACRO_END
/*
* the page queues. Change wiring
* case is obvious.
*/
- assert(m->compressor || m->object != compressor_object);
- if (m->compressor) {
+ assert((m->vmp_q_state == VM_PAGE_USED_BY_COMPRESSOR) || object != compressor_object);
+
+#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(m->object == compressor_object);
+ assert(object == compressor_object);
} else if (change_wiring) {
- __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED();
+ __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);
}
/* we keep the page queues lock, if we need it later */
-
} else {
- if (kr != KERN_SUCCESS) {
- __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED();
- vm_page_deactivate(m);
+ 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->active && !m->inactive) ||
- m->clean_queue ||
- no_cache) &&
- !VM_PAGE_WIRED(m) && !m->throttled) {
-
+ } 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 &&
- !no_cache &&
(*type_of_fault == DBG_COW_FAULT ||
- *type_of_fault == DBG_ZERO_FILL_FAULT) ) {
- struct vpl *lq;
- uint32_t lid;
+ *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(m->object);
+ vm_object_lock_assert_exclusive(object);
/*
* we got a local queue to stuff this
* 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
+ * going to be behind the local queue's
* lock to do the real work
*/
lid = cpu_number();
VPL_LOCK(&lq->vpl_lock);
- queue_enter(&lq->vpl_queue, m,
- vm_page_t, pageq);
- m->local = TRUE;
- m->local_id = lid;
+ 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 (m->object->internal)
+
+ if (object->internal) {
lq->vpl_internal_count++;
- else
+ } else {
lq->vpl_external_count++;
+ }
VPL_UNLOCK(&lq->vpl_lock);
- if (lq->vpl_count > vm_page_local_q_soft_limit)
- {
+ if (lq->vpl_count > vm_page_local_q_soft_limit) {
/*
* we're beyond the soft limit
* for the local queue
vm_page_reactivate_local(lid, FALSE, FALSE);
}
} else {
-
__VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED();
/*
* page queue lock
*/
if (!VM_PAGE_WIRED(m)) {
- if (m->clean_queue) {
- VM_PAGE_QUEUES_REMOVE(m);
+ if (m->vmp_q_state == VM_PAGE_ON_INACTIVE_CLEANED_Q) {
+ vm_page_queues_remove(m, FALSE);
- vm_pageout_cleaned_reactivated++;
- vm_pageout_cleaned_fault_reactivated++;
+ VM_PAGEOUT_DEBUG(vm_pageout_cleaned_reactivated, 1);
+ VM_PAGEOUT_DEBUG(vm_pageout_cleaned_fault_reactivated, 1);
}
- if ((!m->active &&
- !m->inactive) ||
+ if (!VM_PAGE_ACTIVE_OR_INACTIVE(m) ||
no_cache) {
/*
* If this is a no_cache mapping
* that they can be readily
* recycled if free memory runs
* low. Otherwise the page is
- * activated as normal.
+ * activated as normal.
*/
if (no_cache &&
(!previously_pmapped ||
- m->no_cache)) {
- m->no_cache = TRUE;
+ m->vmp_no_cache)) {
+ m->vmp_no_cache = TRUE;
- if (!m->speculative)
+ if (m->vmp_q_state != VM_PAGE_ON_SPECULATIVE_Q) {
vm_page_speculate(m, FALSE);
-
- } else if (!m->active &&
- !m->inactive) {
-
+ }
+ } else if (!VM_PAGE_ACTIVE_OR_INACTIVE(m)) {
vm_page_activate(m);
}
}
}
}
}
-
- if ((prot & VM_PROT_EXECUTE) &&
- ! m->xpmapped) {
-
- __VM_PAGE_LOCKSPIN_QUEUES_IF_NEEDED();
-
- /*
- * xpmapped is protected by the page queues lock
- * so it matters not that we might only hold the
- * object lock in the shared state
- */
-
- if (! m->xpmapped) {
-
- m->xpmapped = TRUE;
- __VM_PAGE_UNLOCK_QUEUES_IF_NEEDED();
-
- if ((COMPRESSED_PAGER_IS_ACTIVE || DEFAULT_FREEZER_COMPRESSED_PAGER_IS_ACTIVE) &&
- m->object->internal &&
- m->object->pager != NULL) {
- /*
- * 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.
- */
- pmap_sync_page_data_phys(m->phys_page);
- }
-
- }
- }
/* we're done with the page queues lock, if we ever took it */
__VM_PAGE_UNLOCK_QUEUES_IF_NEEDED();
* now so those processes can take note.
*/
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
+ * at this point, so we need the phys_page lock to
+ * properly serialize updating the pmapped and
+ * xpmapped bits
*/
- m->pmapped = TRUE;
- if(vm_page_is_slideable(m)) {
- boolean_t was_busy = m->busy;
+ if ((prot & VM_PROT_EXECUTE) && !m->vmp_xpmapped) {
+ ppnum_t phys_page = VM_PAGE_GET_PHYS_PAGE(m);
- vm_object_lock_assert_exclusive(m->object);
+ pmap_lock_phys_page(phys_page);
+ /*
+ * go ahead and take the opportunity
+ * to set 'pmapped' here so that we don't
+ * need to grab this lock a 2nd time
+ * just below
+ */
+ m->vmp_pmapped = TRUE;
- m->busy = TRUE;
- kr = vm_page_slide(m, 0);
- assert(m->busy);
- if(!was_busy) {
- PAGE_WAKEUP_DONE(m);
+ if (!m->vmp_xpmapped) {
+ m->vmp_xpmapped = TRUE;
+
+ pmap_unlock_phys_page(phys_page);
+
+ if (!object->internal) {
+ OSAddAtomic(1, &vm_page_xpmapped_external_count);
+ }
+
+#if defined(__arm__) || defined(__arm64__)
+ pmap_sync_page_data_phys(phys_page);
+#else
+ if (object->internal &&
+ object->pager != NULL) {
+ /*
+ * 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.
+ */
+ assert(VM_CONFIG_COMPRESSOR_IS_PRESENT);
+ pmap_sync_page_data_phys(phys_page);
+ }
+#endif
+ } else {
+ pmap_unlock_phys_page(phys_page);
}
- 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;
+ } else {
+ if (m->vmp_pmapped == FALSE) {
+ ppnum_t phys_page = VM_PAGE_GET_PHYS_PAGE(m);
+
+ pmap_lock_phys_page(phys_page);
+ m->vmp_pmapped = TRUE;
+ pmap_unlock_phys_page(phys_page);
}
}
if (fault_type & VM_PROT_WRITE) {
-
- if (m->wpmapped == FALSE) {
- vm_object_lock_assert_exclusive(m->object);
-
- m->wpmapped = TRUE;
+ 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;
}
if (must_disconnect) {
/*
- * We can only get here
+ * We can only get here
* because of the CSE logic
*/
assert(cs_enforcement_enabled);
- pmap_disconnect(m->phys_page);
- /*
+ 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
+ * gets tainted, so we won't get stuck here
* to make an already writeable page executable.
*/
- if (!cs_bypass){
+ if (!cs_bypass) {
+ assert(!pmap_has_prot_policy(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 */
+
+#if PMAP_CS
+ /*
+ * If CS enforcement is on, we don't ask for an executable page if the
+ * fault does not call for execution, because that can fail in
+ * situations where the caller only actually wanted read access.
+ * However, it may be better to instead retry without execute on
+ * failure, or pass a flag into pmap_enter to do the right thing.
+ */
+ // TODO: <rdar://problem/30997388> maybe do something better than masking out VM_PROT_EXECUTE on non-execute faults
+ if (pmap_cs_enforced(pmap) && !(caller_prot & VM_PROT_EXECUTE)) {
+ prot &= ~VM_PROT_EXECUTE;
+ }
+#endif
/* 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, fault_type, 0,
- wired, PMAP_OPTIONS_NOWAIT, pe_result);
-
- if(pe_result == KERN_RESOURCE_SHORTAGE) {
+ wired,
+ pmap_options | PMAP_OPTIONS_NOWAIT,
+ pe_result);
+#if __x86_64__
+ if (pe_result == 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.
+ */
+ pe_result = KERN_SUCCESS;
+ }
+#endif /* __x86_64__ */
+ if (pe_result == 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
+ * 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
+ * is to deal with it at a higher level where we can
* drop both locks.
*/
*need_retry = TRUE;
}
/* 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
+ * 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->busy;
+ boolean_t was_busy = m->vmp_busy;
+
+ vm_object_lock_assert_exclusive(object);
+
+ m->vmp_busy = TRUE;
+ vm_object_unlock(object);
- vm_object_lock_assert_exclusive(m->object);
+ PMAP_ENTER_OPTIONS(pmap, vaddr, m, prot, fault_type,
+ 0, wired,
+ pmap_options, pe_result);
+
+ assert(VM_PAGE_OBJECT(m) == object);
- m->busy = TRUE;
- vm_object_unlock(m->object);
-
- PMAP_ENTER(pmap, vaddr, m, prot, fault_type, 0, wired);
-
/* Take the object lock again. */
- vm_object_lock(m->object);
-
+ vm_object_lock(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) {
+ assert(m->vmp_busy);
+ if (!was_busy) {
PAGE_WAKEUP_DONE(m);
}
vm_pmap_enter_blocked++;
}
+
+ kr = pe_result;
}
after_the_pmap_enter:
return kr;
}
+void
+vm_pre_fault(vm_map_offset_t vaddr)
+{
+ if (pmap_find_phys(current_map()->pmap, vaddr) == 0) {
+ vm_fault(current_map(), /* map */
+ vaddr, /* vaddr */
+ VM_PROT_READ, /* 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
*/
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, vm_tag_bt(),
+ 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);
+}
+
+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_offset_t cur_offset;
- vm_page_t cur_m;
- vm_object_t new_object;
+ 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;
- boolean_t need_retry = FALSE;
- boolean_t *need_retry_ptr = NULL;
- int object_lock_type = 0;
- int cur_object_lock_type;
- vm_object_t top_object = VM_OBJECT_NULL;
- int throttle_delay;
-
-
- KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
- (MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_START,
- ((uint64_t)vaddr >> 32),
- 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;
+ boolean_t object_locks_dropped = FALSE;
+ vm_prot_t fault_type;
+ vm_prot_t original_fault_type;
+ struct vm_object_fault_info fault_info = {};
+ boolean_t need_collapse = FALSE;
+ boolean_t need_retry = FALSE;
+ boolean_t *need_retry_ptr = NULL;
+ int object_lock_type = 0;
+ int 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;
+ int grab_options;
+ vm_map_offset_t trace_vaddr;
+ vm_map_offset_t trace_real_vaddr;
+#if DEVELOPMENT || DEBUG
+ vm_map_offset_t real_vaddr;
+
+ real_vaddr = vaddr;
+#endif /* DEVELOPMENT || DEBUG */
+ trace_real_vaddr = vaddr;
+ 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_IST(KDEBUG_TRACE,
- (MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_END,
- ((uint64_t)vaddr >> 32),
- vaddr,
- KERN_FAILURE,
- 0,
- 0);
-
- return (KERN_FAILURE);
+ 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();
+ boolean_t rtfault = (cthread->sched_mode == TH_MODE_REALTIME);
+ uint64_t fstart = 0;
+
+ 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;
+ if (fault_type & VM_PROT_WRITE) {
+ 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
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);
+ object_lock_type, &version,
+ &object, &offset, &prot, &wired,
+ &fault_info,
+ &real_map);
if (kr != KERN_SUCCESS) {
vm_map_unlock_read(map);
* 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
/*
* 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) {
/*
}
m = vm_page_lookup(cur_object, 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) {
-
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 can no longer be
* certain about cur_object (since we
*/
vm_object_unlock(object);
- 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;
}
}
} 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->pageout_queue && m->object->internal && COMPRESSED_PAGER_IS_ACTIVE) {
+ if ((m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) && m_object->internal) {
/*
- * m->busy == TRUE and the object is locked exclusively
+ * 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->pageout_queue) {
+ if (m->vmp_q_state == VM_PAGE_ON_PAGEOUT_Q) {
vm_pageout_throttle_up(m);
vm_page_unlock_queues();
}
vm_page_unlock_queues();
}
- if (object != cur_object)
+ 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;
}
reclaimed_from_pageout:
- if (m->laundry) {
+ if (m->vmp_laundry) {
if (object != cur_object) {
if (cur_object_lock_type == OBJECT_LOCK_SHARED) {
cur_object_lock_type = OBJECT_LOCK_EXCLUSIVE;
vm_object_unlock(cur_object);
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;
if (vm_object_lock_upgrade(object) == FALSE) {
continue;
}
}
- m->pageout = FALSE;
-
vm_pageout_steal_laundry(m, FALSE);
}
- if (m->phys_page == vm_page_guard_addr) {
+ if (VM_PAGE_GET_PHYS_PAGE(m) == 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)) {
- /*
+ if (m->vmp_unusual && (m->vmp_error || m->vmp_restart || m->vmp_private || m->vmp_absent)) {
+ /*
* Unusual case... let the slow path deal with it
*/
break;
}
- if (VM_OBJECT_PURGEABLE_FAULT_ERROR(m->object)) {
- if (object != cur_object)
+ 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);
+ 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 (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);
-
- 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'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);
-
- goto RetryFault;
- }
- }
- } else if (object_lock_type == OBJECT_LOCK_SHARED) {
-
- 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
- * 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->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_object_unlock(cur_object);
- /*
- * Retry from the top, in case anything
- * changed while we were decrypting...
- */
- goto RetryFault;
- }
- ASSERT_PAGE_DECRYPTED(m);
-
- if(vm_page_is_slideable(m)) {
- /*
- * We might need to slide this page, and so,
- * we want to hold the VM object exclusively.
- */
- 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) {
-
- vm_object_unlock(object);
- object_lock_type = OBJECT_LOCK_EXCLUSIVE;
- vm_map_unlock_read(map);
- goto RetryFault;
- }
- }
-
- if (VM_FAULT_NEED_CS_VALIDATION(map->pmap, m)) {
+ if (VM_FAULT_NEED_CS_VALIDATION(map->pmap, m, m_object) ||
+ (physpage_p != NULL && (prot & VM_PROT_WRITE))) {
upgrade_for_validation:
/*
* 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 (!pmap_has_prot_policy(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 (top_object != VM_OBJECT_NULL || object_lock_type != OBJECT_LOCK_EXCLUSIVE)
+ if (top_object != VM_OBJECT_NULL || object_lock_type != OBJECT_LOCK_EXCLUSIVE) {
need_retry_ptr = &need_retry;
- else
+ } else {
need_retry_ptr = NULL;
+ }
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,
- need_retry_ptr,
- &type_of_fault);
+ kr = vm_fault_enter(m,
+ caller_pmap,
+ caller_pmap_addr,
+ prot,
+ caller_prot,
+ wired,
+ change_wiring,
+ wire_tag,
+ &fault_info,
+ need_retry_ptr,
+ &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,
- need_retry_ptr,
- &type_of_fault);
+ kr = vm_fault_enter(m,
+ pmap,
+ vaddr,
+ prot,
+ caller_prot,
+ wired,
+ change_wiring,
+ wire_tag,
+ &fault_info,
+ need_retry_ptr,
+ &type_of_fault);
+ }
+#if DEVELOPMENT || DEBUG
+ {
+ 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) | type_of_fault, m->vmp_offset, get_current_unique_pid(), 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);
+ }
+#endif
+ 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) {
top_object = VM_OBJECT_NULL;
}
- if (need_collapse == TRUE)
- vm_object_collapse(object, offset, TRUE);
-
+ if (need_collapse == TRUE) {
+ vm_object_collapse(object, 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(object, cur_offset, fault_info.behavior);
+ vm_fault_is_sequential(m_object, cur_offset, fault_info.behavior);
- vm_fault_deactivate_behind(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->busy)
- PAGE_WAKEUP_DONE(m);
+ if (m->vmp_busy) {
+ 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)
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
if (need_retry == TRUE) {
/*
* 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);
-
+ (void)pmap_enter_options(
+ pmap, vaddr, 0, 0, 0, 0, 0,
+ PMAP_OPTIONS_NOENTER, NULL);
+
need_retry = FALSE;
goto RetryFault;
}
*/
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)) {
+ VM_FAULT_NEED_CS_VALIDATION(NULL, m, m_object)) {
goto upgrade_for_validation;
}
* 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
*/
*/
vm_page_copy(cur_m, m);
vm_page_insert(m, object, 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));
+ }
+ 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) {
- int compressor_external_state = VM_EXTERNAL_STATE_UNKNOWN;
+ int compressor_external_state = VM_EXTERNAL_STATE_UNKNOWN;
- if (MUST_ASK_PAGER(cur_object, cur_offset, compressor_external_state) == TRUE) {
- int my_fault_type;
- int c_flags = C_DONT_BLOCK;
- boolean_t insert_cur_object = FALSE;
+ if (MUST_ASK_PAGER(cur_object, cur_offset, compressor_external_state) == TRUE) {
+ int my_fault_type;
+ int c_flags = C_DONT_BLOCK;
+ boolean_t insert_cur_object = FALSE;
- /*
+ /*
* May have to talk to a pager...
* 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)
+ if (compressor_external_state != VM_EXTERNAL_STATE_EXISTS) {
break;
+ }
if (map == kernel_map || real_map == kernel_map) {
/*
break;
}
if (object != cur_object) {
- if (fault_type & VM_PROT_WRITE)
+ if (fault_type & VM_PROT_WRITE) {
c_flags |= C_KEEP;
- else
+ } 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) {
vm_object_unlock(object);
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;
if (object != cur_object) {
vm_object_unlock(cur_object);
vm_map_unlock_read(map);
- if (real_map != map)
+ if (real_map != map) {
vm_map_unlock(real_map);
+ }
goto RetryFault;
}
* at the top level of the object chain
*/
vm_object_lock(object);
-
+
continue;
}
}
- m = vm_page_grab();
+ m = vm_page_grab_options(grab_options);
+ m_object = NULL;
if (m == VM_PAGE_NULL) {
/*
*/
break;
}
- if (vm_compressor_pager_get(cur_object->pager, cur_offset + cur_object->paging_offset,
- m->phys_page, &my_fault_type, c_flags) != KERN_SUCCESS) {
- vm_page_release(m);
+
+ /*
+ * The object is and remains locked
+ * so no need to take a
+ * "paging_in_progress" reference.
+ */
+ boolean_t 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,
+ (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;
break;
}
- m->dirty = TRUE;
+ m->vmp_dirty = TRUE;
- if (insert_cur_object)
+ /*
+ * 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.
+ */
+ 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, cur_offset);
- else
+ m_object = cur_object;
+ } else {
vm_page_insert(m, object, offset);
+ m_object = object;
+ }
- if ((m->object->wimg_bits & VM_WIMG_MASK) != VM_WIMG_USE_DEFAULT) {
- /*
+ 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(m->phys_page);
+ pmap_sync_page_attributes_phys(VM_PAGE_GET_PHYS_PAGE(m));
}
+
type_of_fault = my_fault_type;
VM_STAT_INCR(decompressions);
* 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);
+ 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
+ * the page is probably going to
* be written soon, so don't bother
* to clear the modified bit
*
type_of_fault = vm_fault_zero_page(m, map->no_zero_fill);
goto FastPmapEnter;
- }
+ }
/*
* On to the next level in the shadow chain
*/
/*
* 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);
- /*
+ /*
* 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);
+ XPR(XPR_VM_FAULT, "vm_fault -> vm_fault_page\n", 0, 0, 0, 0, 0);
error_code = 0;
result_page = VM_PAGE_NULL;
kr = vm_fault_page(object, offset, fault_type,
- (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);
+ (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);
*/
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
- */
+ }
+ /*
+ * fall thru
+ */
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);
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(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(prot));
+ prot &= ~VM_PROT_WRITE;
+ }
+ } else {
+ vm_object_lock(object);
}
- } else
- vm_object_lock(object);
+
+ object_locks_dropped = FALSE;
+ }
/*
* If we want to wire down this page, but no longer have
* adequate permissions, we must start all over.
*/
if (wired && (fault_type != (prot | VM_PROT_WRITE))) {
-
- 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);
+
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);
*/
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,
- NULL,
- &type_of_fault);
+ caller_pmap,
+ caller_pmap_addr,
+ 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,
- NULL,
- &type_of_fault);
+ pmap,
+ vaddr,
+ prot,
+ caller_prot,
+ wired,
+ change_wiring,
+ wire_tag,
+ &fault_info,
+ NULL,
+ &type_of_fault);
}
+ assert(VM_PAGE_OBJECT(m) == m_object);
+
+#if DEVELOPMENT || DEBUG
+ {
+ 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) | type_of_fault, m->vmp_offset, get_current_unique_pid(), 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);
+ }
+#endif
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)) {
+ int 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);
/*
- * Only throttle on faults which cause a pagein.
+ * 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);
+
+ 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)vaddr >> 32),
- vaddr,
- kr,
- type_of_fault,
- 0);
+ KERNEL_DEBUG_CONSTANT_IST(KDEBUG_TRACE,
+ (MACHDBG_CODE(DBG_MACH_VM, 2)) | DBG_FUNC_END,
+ ((uint64_t)trace_vaddr >> 32),
+ trace_vaddr,
+ kr,
+ type_of_fault,
+ 0);
- return (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;
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
*/
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));
+ 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;
- 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;
- fault_info.batch_pmap_op = FALSE;
+
+ unwired_pages = 0;
/*
* Since the pages are wired down, we must be able to
*/
for (va = entry->vme_start; va < end_addr; va += 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);
+ "vm_fault_unwire -> vm_fault_page\n",
+ 0, 0, 0, 0, 0);
result_page = VM_PAGE_NULL;
- result = vm_fault_page(
+ 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) {
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) {
+ vm_tag_update_size(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;
+ 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))) {
-
+ 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;
+ }
+
/*
* 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,
- NULL,
- &type_of_fault);
+ pmap,
+ pmap_addr,
+ 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_src.batch_pmap_op = 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;
- fault_info_dst.batch_pmap_op = 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);
+ 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,
- FALSE, /* page not looked up */
- &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 */
+ }
+ /* fall thru */
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*/
+ /*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);
+ "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,
FALSE, /* page not looked up */
- &src_prot,
+ &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 */
+ }
+ /* fall thru */
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*/
+ /*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);
SET_PAGE_DIRTY(dst_page, TRUE);
- vm_object_unlock(dst_page->object);
+ 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{
- vm_object_lock(result_page->object);
+ } else {
+ vm_object_lock(result_page_object);
vm_page_copy(result_page, dst_page);
- vm_object_unlock(result_page->object);
+ vm_object_unlock(result_page_object);
- if(!dst_page->dirty){
+ if (!dst_page->vmp_dirty) {
vm_object_lock(dst_object);
SET_PAGE_DIRTY(dst_page, TRUE);
- vm_object_unlock(dst_page->object);
+ 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 */
-
-void
-vm_page_validate_cs_mapped(
- vm_page_t page,
- const void *kaddr)
+vm_offset_t
+kdp_lightweight_fault(vm_map_t map, vm_offset_t cur_target_addr)
{
- vm_object_t object;
- vm_object_offset_t offset;
- kern_return_t kr;
- memory_object_t pager;
- void *blobs;
- boolean_t validated, tainted;
+ 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;
+
+ if (not_in_kdp) {
+ panic("kdp_lightweight_fault called from outside of debugger context");
+ }
- assert(page->busy);
- vm_object_lock_assert_exclusive(page->object);
+ assert(map != VM_MAP_NULL);
- if (!cs_validation) {
- return;
+ assert((cur_target_addr & PAGE_MASK) == 0);
+ if ((cur_target_addr & PAGE_MASK) != 0) {
+ return 0;
+ }
+
+ 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, 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, (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;
}
+}
+
+/*
+ * 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_object_t object;
+
+ object = VM_PAGE_OBJECT(page);
+ vm_object_lock_assert_held(object);
- if (page->wpmapped && !page->cs_tainted) {
+ if (page->vmp_wpmapped && !page->vmp_cs_tainted) {
/*
* 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);
+ page->vmp_cs_validated = TRUE;
+ page->vmp_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);
+ 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 (page->vmp_cs_validated || page->vmp_cs_tainted) {
+ 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 = TRUE;
+ page->vmp_cs_tainted = 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;
+ boolean_t validated;
+ unsigned tainted;
+
+ 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,
- pager,
- offset + object->paging_offset,
- (const void *)kaddr,
- &tainted);
-
- page->cs_validated = validated;
- if (validated) {
- page->cs_tainted = tainted;
+ tainted = 0;
+ validated = cs_validate_range(vnode,
+ pager,
+ mo_offset,
+ (const void *)((const char *)kaddr),
+ PAGE_SIZE_64,
+ &tainted);
+
+ if (tainted & CS_VALIDATE_TAINTED) {
+ page->vmp_cs_tainted = TRUE;
}
-}
-
-extern int panic_on_cs_killed;
-void
-vm_page_validate_cs(
- vm_page_t page)
-{
- 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;
-
- vm_object_lock_assert_held(page->object);
-
- if (!cs_validation) {
- return;
+ if (tainted & CS_VALIDATE_NX) {
+ page->vmp_cs_nx = TRUE;
}
-
- 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 (validated) {
+ page->vmp_cs_validated = TRUE;
}
- if (page->cs_validated) {
- return;
+#if CHECK_CS_VALIDATION_BITMAP
+ if (page->vmp_cs_validated && !page->vmp_cs_tainted) {
+ vnode_pager_cs_check_validation_bitmap(object->pager,
+ mo_offset,
+ CS_BITMAP_SET);
}
+#endif /* CHECK_CS_VALIDATION_BITMAP */
+}
- if (panic_on_cs_killed &&
- page->slid) {
- panic("vm_page_validate_cs(%p): page is slid\n", page);
+void
+vm_page_validate_cs_mapped(
+ vm_page_t page,
+ const void *kaddr)
+{
+ if (!vm_page_validate_cs_fast(page)) {
+ vm_page_validate_cs_mapped_slow(page, kaddr);
}
- assert(!page->slid);
+}
-#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_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)) {
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,
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);
+ 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) {
}
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>
+
+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;
+ uint32_t bfrs = 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.
+ */
+ int btr = backtrace_thread_user(cthread, &bpc, 1U, &bfrs, &u64);
+
+ 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, int vrecordsz, void *vrecords, int *vmrtfrv)
+{
+ vm_rtfault_record_t *cvmrd = vrecords;
+ size_t residue = vrecordsz;
+ int 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