/*
- * Copyright (c) 2000-2009 Apple Inc. All rights reserved.
+ * Copyright (c) 2000-2012 Apple Inc. All rights reserved.
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_START@
*
* @APPLE_OSREFERENCE_LICENSE_HEADER_END@
*/
-#include <vm/pmap.h>
-#include <sys/kdebug.h>
-#include <kern/debug.h>
+#ifndef _I386_PMAP_INTERNAL_
+#define _I386_PMAP_INTERNAL_
#ifdef MACH_KERNEL_PRIVATE
+#include <vm/pmap.h>
+#include <sys/kdebug.h>
+#include <kern/ledger.h>
+#include <kern/simple_lock.h>
+#include <i386/bit_routines.h>
+
/*
* pmap locking
*/
simple_unlock(&(pmap)->lock); \
}
+#define PMAP_UPDATE_TLBS(pmap, s, e) \
+ pmap_flush_tlbs(pmap, s, e, 0, NULL)
+
+
+#define PMAP_DELAY_TLB_FLUSH 0x01
+
+#define PMAP_UPDATE_TLBS_DELAYED(pmap, s, e, c) \
+ pmap_flush_tlbs(pmap, s, e, PMAP_DELAY_TLB_FLUSH, c)
-#define PMAP_UPDATE_TLBS(pmap, s, e) \
- pmap_flush_tlbs(pmap)
#define iswired(pte) ((pte) & INTEL_PTE_WIRED)
#ifdef PMAP_TRACES
extern boolean_t pmap_trace;
-#define PMAP_TRACE(x,a,b,c,d,e) \
- if (pmap_trace) { \
- KERNEL_DEBUG_CONSTANT(x,a,b,c,d,e); \
+#define PMAP_TRACE(...) \
+ if (pmap_trace) { \
+ KDBG_RELEASE(__VA_ARGS__); \
}
#else
-#define PMAP_TRACE(x,a,b,c,d,e) KERNEL_DEBUG(x,a,b,c,d,e)
+#define PMAP_TRACE(...) KDBG_DEBUG(__VA_ARGS__)
#endif /* PMAP_TRACES */
-void pmap_expand_pml4(
+#define PMAP_TRACE_CONSTANT(...) KDBG_RELEASE(__VA_ARGS__)
+
+kern_return_t pmap_expand_pml4(
pmap_t map,
- vm_map_offset_t v);
+ vm_map_offset_t v,
+ unsigned int options);
-void pmap_expand_pdpt(
+kern_return_t pmap_expand_pdpt(
pmap_t map,
- vm_map_offset_t v);
-extern void pmap_flush_tlbs(pmap_t pmap);
+ vm_map_offset_t v,
+ unsigned int options);
+
+void phys_attribute_set(
+ ppnum_t phys,
+ int bits);
+
+void pmap_set_reference(
+ ppnum_t pn);
+
+boolean_t phys_page_exists(
+ ppnum_t pn);
+
+void
+pmap_flush_tlbs(pmap_t, vm_map_offset_t, vm_map_offset_t, int, pmap_flush_context *);
+
+void
+pmap_update_cache_attributes_locked(ppnum_t, unsigned);
-#if defined(__x86_64__)
extern const boolean_t cpu_64bit;
-#else
-extern boolean_t cpu_64bit;
-#endif
/*
* Private data structures.
PV HASHING Changes - JK 1/2007
Pve's establish physical to virtual mappings. These are used for aliasing of a
-physical page to (potentially many) virtual addresses within pmaps. In the previous
-implementation the structure of the pv_entries (each 16 bytes in size) was
+physical page to (potentially many) virtual addresses within pmaps. In the
+previous implementation the structure of the pv_entries (each 16 bytes in size) was
typedef struct pv_entry {
struct pv_entry_t next;
vm_map_offset_t va;
} *pv_entry_t;
-An initial array of these is created at boot time, one per physical page of memory,
-indexed by the physical page number. Additionally, a pool of entries is created from a
-pv_zone to be used as needed by pmap_enter() when it is creating new mappings.
-Originally, we kept this pool around because the code in pmap_enter() was unable to
-block if it needed an entry and none were available - we'd panic. Some time ago I
-restructured the pmap_enter() code so that for user pmaps it can block while zalloc'ing
-a pv structure and restart, removing a panic from the code (in the case of the kernel
-pmap we cannot block and still panic, so, we keep a separate hot pool for use only on
-kernel pmaps). The pool has not been removed since there is a large performance gain
-keeping freed pv's around for reuse and not suffering the overhead of zalloc for every new pv we need.
-
-As pmap_enter() created new mappings it linked the new pve's for them off the fixed
-pv array for that ppn (off the next pointer). These pve's are accessed for several
-operations, one of them being address space teardown. In that case, we basically do this
+An initial array of these is created at boot time, one per physical page of
+memory, indexed by the physical page number. Additionally, a pool of entries
+is created from a pv_zone to be used as needed by pmap_enter() when it is
+creating new mappings. Originally, we kept this pool around because the code
+in pmap_enter() was unable to block if it needed an entry and none were
+available - we'd panic. Some time ago I restructured the pmap_enter() code
+so that for user pmaps it can block while zalloc'ing a pv structure and restart,
+removing a panic from the code (in the case of the kernel pmap we cannot block
+and still panic, so, we keep a separate hot pool for use only on kernel pmaps).
+The pool has not been removed since there is a large performance gain keeping
+freed pv's around for reuse and not suffering the overhead of zalloc for every
+new pv we need.
+
+As pmap_enter() created new mappings it linked the new pve's for them off the
+fixed pv array for that ppn (off the next pointer). These pve's are accessed
+for several operations, one of them being address space teardown. In that case,
+we basically do this
for (every page/pte in the space) {
calc pve_ptr from the ppn in the pte
}
}
-The problem arose when we were running, say 8000 (or even 2000) apache or other processes
-and one or all terminate. The list hanging off each pv array entry could have thousands of
-entries. We were continuously linearly searching each of these lists as we stepped through
-the address space we were tearing down. Because of the locks we hold, likely taking a cache
-miss for each node, and interrupt disabling for MP issues the system became completely
-unresponsive for many seconds while we did this.
-
-Realizing that pve's are accessed in two distinct ways (linearly running the list by ppn
-for operations like pmap_page_protect and finding and modifying/removing a single pve as
-part of pmap_enter processing) has led to modifying the pve structures and databases.
-
-There are now two types of pve structures. A "rooted" structure which is basically the
-original structure accessed in an array by ppn, and a ''hashed'' structure accessed on a
-hash list via a hash of [pmap, vaddr]. These have been designed with the two goals of
-minimizing wired memory and making the lookup of a ppn faster. Since a vast majority of
-pages in the system are not aliased and hence represented by a single pv entry I've kept
-the rooted entry size as small as possible because there is one of these dedicated for
-every physical page of memory. The hashed pve's are larger due to the addition of the hash
-link and the ppn entry needed for matching while running the hash list to find the entry we
-are looking for. This way, only systems that have lots of aliasing (like 2000+ httpd procs)
-will pay the extra memory price. Both structures have the same first three fields allowing
-some simplification in the code.
+The problem arose when we were running, say 8000 (or even 2000) apache or
+other processes and one or all terminate. The list hanging off each pv array
+entry could have thousands of entries. We were continuously linearly searching
+each of these lists as we stepped through the address space we were tearing
+down. Because of the locks we hold, likely taking a cache miss for each node,
+and interrupt disabling for MP issues the system became completely unresponsive
+for many seconds while we did this.
+
+Realizing that pve's are accessed in two distinct ways (linearly running the
+list by ppn for operations like pmap_page_protect and finding and
+modifying/removing a single pve as part of pmap_enter processing) has led to
+modifying the pve structures and databases.
+
+There are now two types of pve structures. A "rooted" structure which is
+basically the original structure accessed in an array by ppn, and a ''hashed''
+structure accessed on a hash list via a hash of [pmap, vaddr]. These have been
+designed with the two goals of minimizing wired memory and making the lookup of
+a ppn faster. Since a vast majority of pages in the system are not aliased
+and hence represented by a single pv entry I've kept the rooted entry size as
+small as possible because there is one of these dedicated for every physical
+page of memory. The hashed pve's are larger due to the addition of the hash
+link and the ppn entry needed for matching while running the hash list to find
+the entry we are looking for. This way, only systems that have lots of
+aliasing (like 2000+ httpd procs) will pay the extra memory price. Both
+structures have the same first three fields allowing some simplification in
+the code.
They have these shapes
typedef struct pv_rooted_entry {
- queue_head_t qlink;
- vm_map_offset_t va;
- pmap_t pmap;
+ queue_head_t qlink;
+ vm_map_offset_t va;
+ pmap_t pmap;
} *pv_rooted_entry_t;
typedef struct pv_hashed_entry {
- queue_head_t qlink;
- vm_map_offset_t va;
- pmap_t pmap;
- ppnum_t ppn;
- struct pv_hashed_entry *nexth;
+ queue_head_t qlink;
+ vm_map_offset_t va;
+ pmap_t pmap;
+ ppnum_t ppn;
+ struct pv_hashed_entry *nexth;
} *pv_hashed_entry_t;
-The main flow difference is that the code is now aware of the rooted entry and the hashed
-entries. Code that runs the pv list still starts with the rooted entry and then continues
-down the qlink onto the hashed entries. Code that is looking up a specific pv entry first
-checks the rooted entry and then hashes and runs the hash list for the match. The hash list
-lengths are much smaller than the original pv lists that contained all aliases for the specific ppn.
+The main flow difference is that the code is now aware of the rooted entry and
+the hashed entries. Code that runs the pv list still starts with the rooted
+entry and then continues down the qlink onto the hashed entries. Code that is
+looking up a specific pv entry first checks the rooted entry and then hashes
+and runs the hash list for the match. The hash list lengths are much smaller
+than the original pv lists that contained all aliases for the specific ppn.
*/
-typedef struct pv_rooted_entry { /* first three entries must match pv_hashed_entry_t */
- queue_head_t qlink;
- vm_map_offset_t va; /* virtual address for mapping */
- pmap_t pmap; /* pmap where mapping lies */
+typedef struct pv_rooted_entry {
+ /* first three entries must match pv_hashed_entry_t */
+ queue_head_t qlink;
+ vm_map_offset_t va_and_flags; /* virtual address for mapping */
+ pmap_t pmap; /* pmap where mapping lies */
} *pv_rooted_entry_t;
#define PV_ROOTED_ENTRY_NULL ((pv_rooted_entry_t) 0)
-
-typedef struct pv_hashed_entry { /* first three entries must match pv_rooted_entry_t */
- queue_head_t qlink;
- vm_map_offset_t va;
- pmap_t pmap;
- ppnum_t ppn;
- struct pv_hashed_entry *nexth;
+typedef struct pv_hashed_entry {
+ /* first three entries must match pv_rooted_entry_t */
+ queue_head_t qlink;
+ vm_map_offset_t va_and_flags;
+ pmap_t pmap;
+ ppnum_t ppn;
+ struct pv_hashed_entry *nexth;
} *pv_hashed_entry_t;
#define PV_HASHED_ENTRY_NULL ((pv_hashed_entry_t)0)
-/* #define PV_DEBUG 1 uncomment to enable some PV debugging code */
+#define PVE_VA(pve) ((pve)->va_and_flags & ~PAGE_MASK)
+#define PVE_FLAGS(pve) ((pve)->va_and_flags & PAGE_MASK)
+#define PVE_IS_ALTACCT 0x001
+#define PVE_IS_ALTACCT_PAGE(pve) \
+ (((pve)->va_and_flags & PVE_IS_ALTACCT) ? TRUE : FALSE)
+
+//#define PV_DEBUG 1 /* uncomment to enable some PV debugging code */
#ifdef PV_DEBUG
-#define CHK_NPVHASH() if(0 == npvhash) panic("npvhash uninitialized");
+#define CHK_NPVHASH() if(0 == npvhashmask) panic("npvhash uninitialized");
#else
-#define CHK_NPVHASH()
+#define CHK_NPVHASH(x)
#endif
-#define NPVHASH 4095 /* MUST BE 2^N - 1 */
-#define PV_HASHED_LOW_WATER_MARK 5000
-#define PV_HASHED_KERN_LOW_WATER_MARK 400
-#define PV_HASHED_ALLOC_CHUNK 2000
-#define PV_HASHED_KERN_ALLOC_CHUNK 200
-
-#define PV_HASHED_ALLOC(pvh_e) { \
- simple_lock(&pv_hashed_free_list_lock); \
- if ((pvh_e = pv_hashed_free_list) != 0) { \
- pv_hashed_free_list = (pv_hashed_entry_t)pvh_e->qlink.next; \
- pv_hashed_free_count--; \
- if (pv_hashed_free_count < PV_HASHED_LOW_WATER_MARK) \
- if (hw_compare_and_store(0,1,(u_int *)&mappingrecurse)) \
- thread_call_enter(mapping_adjust_call); \
- } \
- simple_unlock(&pv_hashed_free_list_lock); \
+#define NPVHASHBUCKETS (4096)
+#define NPVHASHMASK ((NPVHASHBUCKETS) - 1) /* MUST BE 2^N - 1 */
+#define PV_HASHED_LOW_WATER_MARK_DEFAULT 5000
+#define PV_HASHED_KERN_LOW_WATER_MARK_DEFAULT 2000
+#define PV_HASHED_ALLOC_CHUNK_INITIAL 2000
+#define PV_HASHED_KERN_ALLOC_CHUNK_INITIAL 200
+
+extern volatile uint32_t mappingrecurse;
+extern uint32_t pv_hashed_low_water_mark, pv_hashed_kern_low_water_mark;
+
+/*
+ * PV hash locking
+ */
+
+#define LOCK_PV_HASH(hash) lock_hash_hash(hash)
+#define UNLOCK_PV_HASH(hash) unlock_hash_hash(hash)
+extern uint32_t npvhashmask;
+extern pv_hashed_entry_t *pv_hash_table; /* hash lists */
+extern pv_hashed_entry_t pv_hashed_free_list;
+extern pv_hashed_entry_t pv_hashed_kern_free_list;
+decl_simple_lock_data(extern, pv_hashed_free_list_lock)
+decl_simple_lock_data(extern, pv_hashed_kern_free_list_lock)
+decl_simple_lock_data(extern, pv_hash_table_lock)
+decl_simple_lock_data(extern, phys_backup_lock)
+
+extern zone_t pv_hashed_list_zone; /* zone of pv_hashed_entry
+ * structures */
+
+extern uint32_t pv_hashed_free_count;
+extern uint32_t pv_hashed_kern_free_count;
+/*
+ * Each entry in the pv_head_table is locked by a bit in the
+ * pv_lock_table. The lock bits are accessed by the address of
+ * the frame they lock.
+ */
+#define pv_lock_table_size(n) (((n)+BYTE_SIZE-1)/BYTE_SIZE)
+#define pv_hash_lock_table_size(n) (((n)+BYTE_SIZE-1)/BYTE_SIZE)
+extern char *pv_lock_table; /* pointer to array of bits */
+extern char *pv_hash_lock_table;
+extern pv_rooted_entry_t pv_head_table; /* array of entries, one per page */
+
+extern event_t mapping_replenish_event;
+
+static inline void PV_HASHED_ALLOC(pv_hashed_entry_t *pvh_ep) {
+ pmap_assert(*pvh_ep == PV_HASHED_ENTRY_NULL);
+ simple_lock(&pv_hashed_free_list_lock);
+ /* If the kernel reserved pool is low, let non-kernel mappings allocate
+ * synchronously, possibly subject to a throttle.
+ */
+ if ((pv_hashed_kern_free_count > pv_hashed_kern_low_water_mark) && ((*pvh_ep = pv_hashed_free_list) != 0)) {
+ pv_hashed_free_list = (pv_hashed_entry_t)(*pvh_ep)->qlink.next;
+ pv_hashed_free_count--;
+ }
+
+ simple_unlock(&pv_hashed_free_list_lock);
+
+ if (pv_hashed_free_count <= pv_hashed_low_water_mark) {
+ if (!mappingrecurse && hw_compare_and_store(0,1, &mappingrecurse))
+ thread_wakeup(&mapping_replenish_event);
+ }
+}
+
+static inline void PV_HASHED_FREE_LIST(pv_hashed_entry_t pvh_eh, pv_hashed_entry_t pvh_et, int pv_cnt) {
+ simple_lock(&pv_hashed_free_list_lock);
+ pvh_et->qlink.next = (queue_entry_t)pv_hashed_free_list;
+ pv_hashed_free_list = pvh_eh;
+ pv_hashed_free_count += pv_cnt;
+ simple_unlock(&pv_hashed_free_list_lock);
}
-#define PV_HASHED_FREE_LIST(pvh_eh, pvh_et, pv_cnt) { \
- simple_lock(&pv_hashed_free_list_lock); \
- pvh_et->qlink.next = (queue_entry_t)pv_hashed_free_list; \
- pv_hashed_free_list = pvh_eh; \
- pv_hashed_free_count += pv_cnt; \
- simple_unlock(&pv_hashed_free_list_lock); \
+extern unsigned pmap_kern_reserve_alloc_stat;
+
+static inline void PV_HASHED_KERN_ALLOC(pv_hashed_entry_t *pvh_e) {
+ pmap_assert(*pvh_e == PV_HASHED_ENTRY_NULL);
+ simple_lock(&pv_hashed_kern_free_list_lock);
+
+ if ((*pvh_e = pv_hashed_kern_free_list) != 0) {
+ pv_hashed_kern_free_list = (pv_hashed_entry_t)(*pvh_e)->qlink.next;
+ pv_hashed_kern_free_count--;
+ pmap_kern_reserve_alloc_stat++;
+ }
+
+ simple_unlock(&pv_hashed_kern_free_list_lock);
+
+ if (pv_hashed_kern_free_count < pv_hashed_kern_low_water_mark) {
+ if (!mappingrecurse && hw_compare_and_store(0,1, &mappingrecurse))
+ thread_wakeup(&mapping_replenish_event);
+ }
}
-#define PV_HASHED_KERN_ALLOC(pvh_e) { \
- simple_lock(&pv_hashed_kern_free_list_lock); \
- if ((pvh_e = pv_hashed_kern_free_list) != 0) { \
- pv_hashed_kern_free_list = (pv_hashed_entry_t)pvh_e->qlink.next; \
- pv_hashed_kern_free_count--; \
- if (pv_hashed_kern_free_count < PV_HASHED_KERN_LOW_WATER_MARK) \
- if (hw_compare_and_store(0,1,(u_int *)&mappingrecurse)) \
- thread_call_enter(mapping_adjust_call); \
- } \
- simple_unlock(&pv_hashed_kern_free_list_lock); \
+static inline void PV_HASHED_KERN_FREE_LIST(pv_hashed_entry_t pvh_eh, pv_hashed_entry_t pvh_et, int pv_cnt) {
+ simple_lock(&pv_hashed_kern_free_list_lock);
+ pvh_et->qlink.next = (queue_entry_t)pv_hashed_kern_free_list;
+ pv_hashed_kern_free_list = pvh_eh;
+ pv_hashed_kern_free_count += pv_cnt;
+ simple_unlock(&pv_hashed_kern_free_list_lock);
}
-#define PV_HASHED_KERN_FREE_LIST(pvh_eh, pvh_et, pv_cnt) { \
- simple_lock(&pv_hashed_kern_free_list_lock); \
- pvh_et->qlink.next = (queue_entry_t)pv_hashed_kern_free_list; \
- pv_hashed_kern_free_list = pvh_eh; \
- pv_hashed_kern_free_count += pv_cnt; \
- simple_unlock(&pv_hashed_kern_free_list_lock); \
+extern uint64_t pmap_pv_throttle_stat, pmap_pv_throttled_waiters;
+extern event_t pmap_user_pv_throttle_event;
+
+static inline void pmap_pv_throttle(__unused pmap_t p) {
+ pmap_assert(p != kernel_pmap);
+ /* Apply throttle on non-kernel mappings */
+ if (pv_hashed_kern_free_count < (pv_hashed_kern_low_water_mark / 2)) {
+ pmap_pv_throttle_stat++;
+ /* This doesn't need to be strictly accurate, merely a hint
+ * to eliminate the timeout when the reserve is replenished.
+ */
+ pmap_pv_throttled_waiters++;
+ assert_wait_timeout(&pmap_user_pv_throttle_event, THREAD_UNINT, 1, 1000 * NSEC_PER_USEC);
+ thread_block(THREAD_CONTINUE_NULL);
+ }
}
/*
#define lock_pvh_pai(pai) bit_lock(pai, (void *)pv_lock_table)
#define unlock_pvh_pai(pai) bit_unlock(pai, (void *)pv_lock_table)
#define pvhash(idx) (&pv_hash_table[idx])
-
#define lock_hash_hash(hash) bit_lock(hash, (void *)pv_hash_lock_table)
#define unlock_hash_hash(hash) bit_unlock(hash, (void *)pv_hash_lock_table)
#define IS_MANAGED_PAGE(x) \
((unsigned int)(x) <= last_managed_page && \
(pmap_phys_attributes[x] & PHYS_MANAGED))
+#define IS_INTERNAL_PAGE(x) \
+ (IS_MANAGED_PAGE(x) && (pmap_phys_attributes[x] & PHYS_INTERNAL))
+#define IS_REUSABLE_PAGE(x) \
+ (IS_MANAGED_PAGE(x) && (pmap_phys_attributes[x] & PHYS_REUSABLE))
+#define IS_ALTACCT_PAGE(x,pve) \
+ (IS_MANAGED_PAGE((x)) && \
+ (PVE_IS_ALTACCT_PAGE((pve))))
/*
* Physical page attributes. Copy bits from PTE definition.
*/
#define PHYS_MODIFIED INTEL_PTE_MOD /* page modified */
#define PHYS_REFERENCED INTEL_PTE_REF /* page referenced */
-#define PHYS_MANAGED INTEL_PTE_VALID /* page is managed */
-#define PHYS_NOENCRYPT INTEL_PTE_USER /* no need to encrypt this page in the hibernation image */
-
+#define PHYS_MANAGED INTEL_PTE_VALID /* page is managed */
+#define PHYS_NOENCRYPT INTEL_PTE_USER /* no need to encrypt this page in the hibernation image */
+#define PHYS_NCACHE INTEL_PTE_NCACHE
+#define PHYS_PTA INTEL_PTE_PTA
+#define PHYS_CACHEABILITY_MASK (INTEL_PTE_PTA | INTEL_PTE_NCACHE)
+#define PHYS_INTERNAL INTEL_PTE_WTHRU /* page from internal object */
+#define PHYS_REUSABLE INTEL_PTE_WRITE /* page is "reusable" */
+
+extern boolean_t pmap_disable_kheap_nx;
+extern boolean_t pmap_disable_kstack_nx;
+
+#define PMAP_EXPAND_OPTIONS_NONE (0x0)
+#define PMAP_EXPAND_OPTIONS_NOWAIT (PMAP_OPTIONS_NOWAIT)
+#define PMAP_EXPAND_OPTIONS_NOENTER (PMAP_OPTIONS_NOENTER)
+#define PMAP_EXPAND_OPTIONS_ALIASMAP (0x40000000U)
/*
* Amount of virtual memory mapped by one
* page-directory entry.
unlock_pvh_pai(index); \
mp_enable_preemption(); \
}
-/*
- * PV hash locking
- */
-
-#define LOCK_PV_HASH(hash) lock_hash_hash(hash)
-#define UNLOCK_PV_HASH(hash) unlock_hash_hash(hash)
-extern uint32_t npvhash;
-extern pv_hashed_entry_t *pv_hash_table; /* hash lists */
-extern pv_hashed_entry_t pv_hashed_free_list;
-extern pv_hashed_entry_t pv_hashed_kern_free_list;
-decl_simple_lock_data(extern, pv_hashed_free_list_lock)
-decl_simple_lock_data(extern, pv_hashed_kern_free_list_lock)
-decl_simple_lock_data(extern, pv_hash_table_lock)
-
-extern zone_t pv_hashed_list_zone; /* zone of pv_hashed_entry structures */
-
-extern int pv_hashed_free_count;
-extern int pv_hashed_kern_free_count;
-#define pv_lock_table_size(n) (((n)+BYTE_SIZE-1)/BYTE_SIZE)
-#define pv_hash_lock_table_size(n) (((n)+BYTE_SIZE-1)/BYTE_SIZE)
-extern char *pv_lock_table; /* pointer to array of bits */
-extern char *pv_hash_lock_table;
-extern pv_rooted_entry_t pv_head_table; /* array of entries, one
- * per page */
extern uint64_t pde_mapped_size;
extern char *pmap_phys_attributes;
-extern unsigned int last_managed_page;
+extern ppnum_t last_managed_page;
+
+extern ppnum_t lowest_lo;
+extern ppnum_t lowest_hi;
+extern ppnum_t highest_hi;
/*
* when spinning through pmap_remove
#define MAX_PREEMPTION_LATENCY_NS 20000
extern uint64_t max_preemption_latency_tsc;
-/* #define DEBUGINTERRUPTS 1 uncomment to ensure pmap callers have interrupts enabled */
-#ifdef DEBUGINTERRUPTS
+#if DEBUG
+#define PMAP_INTR_DEBUG (1)
+#endif
+
+#if PMAP_INTR_DEBUG
#define pmap_intr_assert() { \
if (processor_avail_count > 1 && !ml_get_interrupts_enabled()) \
- panic("pmap interrupt assert %s, %d",__FILE__, __LINE__); \
+ panic("pmap interrupt assert %d %s, %d", processor_avail_count, __FILE__, __LINE__); \
}
#else
#define pmap_intr_assert()
#endif
-extern int nx_enabled;
-extern unsigned int inuse_ptepages_count;
+extern int nx_enabled;
+extern unsigned int inuse_ptepages_count;
static inline uint32_t
pvhashidx(pmap_t pmap, vm_map_offset_t va)
{
- return ((uint32_t)(uintptr_t)pmap ^
- ((uint32_t)((uint64_t)va >> PAGE_SHIFT) & 0xFFFFFFFF)) &
- npvhash;
+ uint32_t hashidx = ((uint32_t)(uintptr_t)pmap ^
+ ((uint32_t)(va >> PAGE_SHIFT) & 0xFFFFFFFF)) &
+ npvhashmask;
+ return hashidx;
}
/*
* properly deals with the anchor.
* must be called with the hash locked, does not unlock it
*/
-
static inline void
pmap_pvh_unlink(pv_hashed_entry_t pvh)
{
int pvhash_idx;
CHK_NPVHASH();
- pvhash_idx = pvhashidx(pvh->pmap, pvh->va);
+ pvhash_idx = pvhashidx(pvh->pmap, PVE_VA(pvh));
pprevh = pvhash(pvhash_idx);
int pvhash_idx;
CHK_NPVHASH();
- pvhash_idx = pvhashidx(pvh_e->pmap, pvh_e->va);
+ pvhash_idx = pvhashidx(pvh_e->pmap, PVE_VA(pvh_e));
LOCK_PV_HASH(pvhash_idx);
insque(&pvh_e->qlink, &pv_h->qlink);
hashp = pvhash(pvhash_idx);
int pvhash_idx;
CHK_NPVHASH();
- pvhash_idx = pvhashidx(pvh_e->pmap,pvh_e->va);
+ pvhash_idx = pvhashidx(pvh_e->pmap,PVE_VA(pvh_e));
LOCK_PV_HASH(pvhash_idx);
remque(&pvh_e->qlink);
pmap_pvh_unlink(pvh_e);
UNLOCK_PV_HASH(pvhash_idx);
-}
+}
static inline boolean_t popcnt1(uint64_t distance) {
return ((distance & (distance - 1)) == 0);
static inline pmap_pagetable_corruption_action_t
pmap_classify_pagetable_corruption(pmap_t pmap, vm_map_offset_t vaddr, ppnum_t *ppnp, pt_entry_t *ptep, pmap_pv_assertion_t incident) {
- pmap_pv_assertion_t action = PMAP_ACTION_ASSERT;
+ pmap_pagetable_corruption_action_t action = PMAP_ACTION_ASSERT;
pmap_pagetable_corruption_t suppress_reason = PTE_VALID;
ppnum_t suppress_ppn = 0;
pt_entry_t cpte = *ptep;
pv_rooted_entry_t pv_e = pv_h;
uint32_t bitdex;
pmap_t pvpmap = pv_h->pmap;
- vm_map_offset_t pvva = pv_h->va;
+ vm_map_offset_t pvva = PVE_VA(pv_h);
+ vm_map_offset_t pve_flags;
boolean_t ppcd = FALSE;
+ boolean_t is_ept;
/* Ideally, we'd consult the Mach VM here to definitively determine
* the nature of the mapping for this address space and address.
/* As a precautionary measure, mark A+D */
pmap_phys_attributes[ppn_to_pai(ppn)] |= (PHYS_MODIFIED | PHYS_REFERENCED);
+ is_ept = is_ept_pmap(pmap);
/*
* Correct potential single bit errors in either (but not both) element
* of the PV
*/
do {
- if ((popcnt1((uintptr_t)pv_e->pmap ^ (uintptr_t)pmap) && pv_e->va == vaddr) ||
- (pv_e->pmap == pmap && popcnt1(pv_e->va ^ vaddr))) {
+ if ((popcnt1((uintptr_t)pv_e->pmap ^ (uintptr_t)pmap) && PVE_VA(pv_e) == vaddr) ||
+ (pv_e->pmap == pmap && popcnt1(PVE_VA(pv_e) ^ vaddr))) {
+ pve_flags = PVE_FLAGS(pv_e);
pv_e->pmap = pmap;
- pv_e->va = vaddr;
+ pv_h->va_and_flags = vaddr | pve_flags;
suppress_reason = PV_BITFLIP;
action = PMAP_ACTION_RETRY;
goto pmap_cpc_exit;
}
- } while((pv_e = (pv_rooted_entry_t) queue_next(&pv_e->qlink)) != pv_h);
+ } while (((pv_e = (pv_rooted_entry_t) queue_next(&pv_e->qlink))) && (pv_e != pv_h));
/* Discover root entries with a Hamming
* distance of 1 from the supplied
ppnum_t npn = cpn ^ (ppnum_t) (1ULL << bitdex);
if (IS_MANAGED_PAGE(npn)) {
pv_rooted_entry_t npv_h = pai_to_pvh(ppn_to_pai(npn));
- if (npv_h->va == vaddr && npv_h->pmap == pmap) {
+ if (PVE_VA(npv_h) == vaddr && npv_h->pmap == pmap) {
suppress_reason = PTE_BITFLIP;
suppress_ppn = npn;
action = PMAP_ACTION_RETRY_RELOCK;
goto pmap_cpc_exit;
}
- /* Check for malformed/inconsistent entries */
-
- if ((cpte & (INTEL_PTE_NCACHE | INTEL_PTE_WTHRU | INTEL_PTE_PTA)) == (INTEL_PTE_NCACHE | INTEL_PTE_WTHRU)) {
+ /*
+ * Check for malformed/inconsistent entries.
+ * The first check here isn't useful for EPT PTEs because INTEL_EPT_NCACHE == 0
+ */
+ if (!is_ept && ((cpte & (INTEL_PTE_NCACHE | INTEL_PTE_WTHRU | INTEL_PTE_PTA)) == (INTEL_PTE_NCACHE | INTEL_PTE_WTHRU))) {
action = PMAP_ACTION_IGNORE;
suppress_reason = PTE_INVALID_CACHEABILITY;
}
action = PMAP_ACTION_IGNORE;
suppress_reason = PTE_RSVD;
}
- else if ((pmap != kernel_pmap) && ((cpte & INTEL_PTE_USER) == 0)) {
+ else if ((pmap != kernel_pmap) && (!is_ept) && ((cpte & INTEL_PTE_USER) == 0)) {
action = PMAP_ACTION_IGNORE;
suppress_reason = PTE_SUPERVISOR;
}
pmap_pagetable_corruption_log(incident, suppress_reason, action, pmap, vaddr, &cpte, *ppnp, pvpmap, pvva);
return action;
}
+
/*
* Remove pv list entry.
* Called with pv_head_table entry locked.
* Returns pv entry to be freed (or NULL).
*/
-
static inline __attribute__((always_inline)) pv_hashed_entry_t
-pmap_pv_remove( pmap_t pmap,
- vm_map_offset_t vaddr,
- ppnum_t *ppnp,
- pt_entry_t *pte)
+pmap_pv_remove(pmap_t pmap,
+ vm_map_offset_t vaddr,
+ ppnum_t *ppnp,
+ pt_entry_t *pte,
+ boolean_t *was_altacct)
{
pv_hashed_entry_t pvh_e;
pv_rooted_entry_t pv_h;
uint32_t pv_cnt;
ppnum_t ppn;
+ *was_altacct = FALSE;
pmap_pv_remove_retry:
ppn = *ppnp;
pvh_e = PV_HASHED_ENTRY_NULL;
pv_h = pai_to_pvh(ppn_to_pai(ppn));
- if (pv_h->pmap == PMAP_NULL) {
+ if (__improbable(pv_h->pmap == PMAP_NULL)) {
pmap_pagetable_corruption_action_t pac = pmap_classify_pagetable_corruption(pmap, vaddr, ppnp, pte, ROOT_ABSENT);
if (pac == PMAP_ACTION_IGNORE)
goto pmap_pv_remove_exit;
else if (pac == PMAP_ACTION_ASSERT)
- panic("pmap_pv_remove(%p,0x%llx,0x%x, 0x%llx): null pv_list!", pmap, vaddr, ppn, *pte);
+ panic("Possible memory corruption: pmap_pv_remove(%p,0x%llx,0x%x, 0x%llx, %p, %p): null pv_list, priors: %d", pmap, vaddr, ppn, *pte, ppnp, pte, pmap_pagetable_corruption_incidents);
else if (pac == PMAP_ACTION_RETRY_RELOCK) {
LOCK_PVH(ppn_to_pai(*ppnp));
pmap_phys_attributes[ppn_to_pai(*ppnp)] |= (PHYS_MODIFIED | PHYS_REFERENCED);
goto pmap_pv_remove_retry;
}
- if (pv_h->va == vaddr && pv_h->pmap == pmap) {
+ if (PVE_VA(pv_h) == vaddr && pv_h->pmap == pmap) {
+ *was_altacct = IS_ALTACCT_PAGE(ppn_to_pai(*ppnp), pv_h);
/*
* Header is the pv_rooted_entry.
* We can't free that. If there is a queued
* and install as new root.
*/
CHK_NPVHASH();
- pvhash_idx = pvhashidx(pvh_e->pmap, pvh_e->va);
+ pvhash_idx = pvhashidx(pvh_e->pmap, PVE_VA(pvh_e));
LOCK_PV_HASH(pvhash_idx);
remque(&pvh_e->qlink);
pprevh = pvhash(pvhash_idx);
if (PV_HASHED_ENTRY_NULL == *pprevh) {
- panic("pmap_pv_remove(%p,0x%llx,0x%x): "
- "empty hash, removing rooted",
- pmap, vaddr, ppn);
+ panic("Possible memory corruption: pmap_pv_remove(%p,0x%llx,0x%x): "
+ "empty hash, removing rooted, priors: %d",
+ pmap, vaddr, ppn, pmap_pagetable_corruption_incidents);
}
pmap_pvh_unlink(pvh_e);
UNLOCK_PV_HASH(pvhash_idx);
pv_h->pmap = pvh_e->pmap;
- pv_h->va = pvh_e->va; /* dispose of pvh_e */
+ pv_h->va_and_flags = pvh_e->va_and_flags;
+ /* dispose of pvh_e */
} else {
/* none queued after rooted */
pv_h->pmap = PMAP_NULL;
LOCK_PV_HASH(pvhash_idx);
pprevh = pvhash(pvhash_idx);
if (PV_HASHED_ENTRY_NULL == *pprevh) {
- panic("pmap_pv_remove(%p,0x%llx,0x%x): empty hash", pmap, vaddr, ppn);
+ panic("Possible memory corruption: pmap_pv_remove(%p,0x%llx,0x%x, 0x%llx, %p): empty hash, priors: %d",
+ pmap, vaddr, ppn, *pte, pte, pmap_pagetable_corruption_incidents);
}
pvh_e = *pprevh;
pmap_pv_hashlist_walks++;
while (PV_HASHED_ENTRY_NULL != pvh_e) {
pv_cnt++;
if (pvh_e->pmap == pmap &&
- pvh_e->va == vaddr &&
+ PVE_VA(pvh_e) == vaddr &&
pvh_e->ppn == ppn)
break;
pprevh = &pvh_e->nexth;
pvh_e = pvh_e->nexth;
}
+
if (PV_HASHED_ENTRY_NULL == pvh_e) {
pmap_pagetable_corruption_action_t pac = pmap_classify_pagetable_corruption(pmap, vaddr, ppnp, pte, ROOT_PRESENT);
if (pac == PMAP_ACTION_ASSERT)
- panic("pmap_pv_remove(%p,0x%llx,0x%x, 0x%llx): pv not on hash, head: %p, 0x%llx", pmap, vaddr, ppn, *pte, pv_h->pmap, pv_h->va);
+ panic("Possible memory corruption: pmap_pv_remove(%p, 0x%llx, 0x%x, 0x%llx, %p, %p): pv not on hash, head: %p, 0x%llx, priors: %d", pmap, vaddr, ppn, *pte, ppnp, pte, pv_h->pmap, PVE_VA(pv_h), pmap_pagetable_corruption_incidents);
else {
UNLOCK_PV_HASH(pvhash_idx);
if (pac == PMAP_ACTION_RETRY_RELOCK) {
}
}
}
+
+ *was_altacct = IS_ALTACCT_PAGE(ppn_to_pai(*ppnp), pvh_e);
+
pmap_pv_hashlist_cnts += pv_cnt;
if (pmap_pv_hashlist_max < pv_cnt)
pmap_pv_hashlist_max = pv_cnt;
return pvh_e;
}
+static inline __attribute__((always_inline)) boolean_t
+pmap_pv_is_altacct(
+ pmap_t pmap,
+ vm_map_offset_t vaddr,
+ ppnum_t ppn)
+{
+ pv_hashed_entry_t pvh_e;
+ pv_rooted_entry_t pv_h;
+ int pvhash_idx;
+ boolean_t is_altacct;
+
+ pvh_e = PV_HASHED_ENTRY_NULL;
+ pv_h = pai_to_pvh(ppn_to_pai(ppn));
+
+ if (__improbable(pv_h->pmap == PMAP_NULL)) {
+ return FALSE;
+ }
+
+ if (PVE_VA(pv_h) == vaddr && pv_h->pmap == pmap) {
+ /*
+ * Header is the pv_rooted_entry.
+ */
+ return IS_ALTACCT_PAGE(ppn, pv_h);
+ }
+
+ CHK_NPVHASH();
+ pvhash_idx = pvhashidx(pmap, vaddr);
+ LOCK_PV_HASH(pvhash_idx);
+ pvh_e = *(pvhash(pvhash_idx));
+ if (PV_HASHED_ENTRY_NULL == pvh_e) {
+ panic("Possible memory corruption: pmap_pv_is_altacct(%p,0x%llx,0x%x): empty hash",
+ pmap, vaddr, ppn);
+ }
+ while (PV_HASHED_ENTRY_NULL != pvh_e) {
+ if (pvh_e->pmap == pmap &&
+ PVE_VA(pvh_e) == vaddr &&
+ pvh_e->ppn == ppn)
+ break;
+ pvh_e = pvh_e->nexth;
+ }
+ if (PV_HASHED_ENTRY_NULL == pvh_e) {
+ is_altacct = FALSE;
+ } else {
+ is_altacct = IS_ALTACCT_PAGE(ppn, pvh_e);
+ }
+ UNLOCK_PV_HASH(pvhash_idx);
+
+ return is_altacct;
+}
+
+extern int pt_fake_zone_index;
+static inline void
+PMAP_ZINFO_PALLOC(pmap_t pmap, vm_size_t bytes)
+{
+ pmap_ledger_credit(pmap, task_ledgers.tkm_private, bytes);
+}
+
+static inline void
+PMAP_ZINFO_PFREE(pmap_t pmap, vm_size_t bytes)
+{
+ pmap_ledger_debit(pmap, task_ledgers.tkm_private, bytes);
+}
+
+static inline void
+PMAP_ZINFO_SALLOC(pmap_t pmap, vm_size_t bytes)
+{
+ pmap_ledger_credit(pmap, task_ledgers.tkm_shared, bytes);
+}
+
+static inline void
+PMAP_ZINFO_SFREE(pmap_t pmap, vm_size_t bytes)
+{
+ pmap_ledger_debit(pmap, task_ledgers.tkm_shared, bytes);
+}
+
+extern boolean_t pmap_initialized;/* Has pmap_init completed? */
+#define valid_page(x) (pmap_initialized && pmap_valid_page(x))
+
+int phys_attribute_test(
+ ppnum_t phys,
+ int bits);
+void phys_attribute_clear(
+ ppnum_t phys,
+ int bits,
+ unsigned int options,
+ void *arg);
+
+//#define PCID_DEBUG 1
+#if PCID_DEBUG
+#define pmap_pcid_log(fmt, args...) \
+ do { \
+ kprintf(fmt, ##args); \
+ printf(fmt, ##args); \
+ } while(0)
+#else
+#define pmap_pcid_log(fmt, args...)
+#endif
+void pmap_pcid_configure(void);
+
+
+/*
+ * Atomic 64-bit compare and exchange of a page table entry.
+ */
+static inline boolean_t
+pmap_cmpx_pte(pt_entry_t *entryp, pt_entry_t old, pt_entry_t new)
+{
+ boolean_t ret;
+
+ /*
+ * Load the old value into %rax
+ * Load the new value into another register
+ * Compare-exchange-quad at address entryp
+ * If the compare succeeds, the new value is stored, return TRUE.
+ * Otherwise, no swap is made, return FALSE.
+ */
+ asm volatile(
+ " lock; cmpxchgq %2,(%3) \n\t"
+ " setz %%al \n\t"
+ " movzbl %%al,%0"
+ : "=a" (ret)
+ : "a" (old),
+ "r" (new),
+ "r" (entryp)
+ : "memory");
+ return ret;
+}
+
+extern uint32_t pmap_update_clear_pte_count;
+
+static inline void pmap_update_pte(pt_entry_t *mptep, uint64_t pclear_bits, uint64_t pset_bits) {
+ pt_entry_t npte, opte;
+ do {
+ opte = *mptep;
+ if (__improbable(opte == 0)) {
+ pmap_update_clear_pte_count++;
+ break;
+ }
+ npte = opte & ~(pclear_bits);
+ npte |= pset_bits;
+ } while (!pmap_cmpx_pte(mptep, opte, npte));
+}
+
+/*
+ * The single pml4 page per pmap is allocated at pmap create time and exists
+ * for the duration of the pmap. we allocate this page in kernel vm.
+ * this returns the address of the requested pml4 entry in the top level page.
+ */
+static inline
+pml4_entry_t *
+pmap64_pml4(pmap_t pmap, vm_map_offset_t vaddr)
+{
+ if (__improbable((vaddr > 0x00007FFFFFFFFFFFULL) &&
+ (vaddr < 0xFFFF800000000000ULL))) {
+ return (NULL);
+ }
+
+#if DEBUG
+ return PHYSMAP_PTOV(&((pml4_entry_t *)pmap->pm_cr3)[(vaddr >> PML4SHIFT) & (NPML4PG-1)]);
+#else
+ return &pmap->pm_pml4[(vaddr >> PML4SHIFT) & (NPML4PG-1)];
+#endif
+}
+
+static inline pml4_entry_t *
+pmap64_user_pml4(pmap_t pmap, vm_map_offset_t vaddr)
+{
+ if (__improbable((vaddr > 0x00007FFFFFFFFFFFULL) &&
+ (vaddr < 0xFFFF800000000000ULL))) {
+ return (NULL);
+ }
+
+#if DEBUG
+ return PHYSMAP_PTOV(&((pml4_entry_t *)pmap->pm_ucr3)[(vaddr >> PML4SHIFT) & (NPML4PG-1)]);
+#else
+ return &pmap->pm_upml4[(vaddr >> PML4SHIFT) & (NPML4PG-1)];
+#endif
+}
+
+/*
+ * Returns address of requested PDPT entry in the physmap.
+ */
+static inline pdpt_entry_t *
+pmap64_pdpt(pmap_t pmap, vm_map_offset_t vaddr)
+{
+ pml4_entry_t newpf;
+ pml4_entry_t *pml4;
+ boolean_t is_ept;
+
+ pml4 = pmap64_pml4(pmap, vaddr);
+ is_ept = is_ept_pmap(pmap);
+
+ if (pml4 && (*pml4 & PTE_VALID_MASK(is_ept))) {
+ newpf = *pml4 & PG_FRAME;
+ return &((pdpt_entry_t *) PHYSMAP_PTOV(newpf))
+ [(vaddr >> PDPTSHIFT) & (NPDPTPG-1)];
+ }
+ return (NULL);
+}
+/*
+ * Returns the address of the requested PDE entry in the physmap.
+ */
+static inline pd_entry_t *
+pmap64_pde(pmap_t pmap, vm_map_offset_t vaddr)
+{
+ pdpt_entry_t newpf;
+ pdpt_entry_t *pdpt;
+ boolean_t is_ept;
+
+ pdpt = pmap64_pdpt(pmap, vaddr);
+ is_ept = is_ept_pmap(pmap);
+
+ if (pdpt && (*pdpt & PTE_VALID_MASK(is_ept))) {
+ newpf = *pdpt & PG_FRAME;
+ return &((pd_entry_t *) PHYSMAP_PTOV(newpf))
+ [(vaddr >> PDSHIFT) & (NPDPG-1)];
+ }
+ return (NULL);
+}
+
+static inline pd_entry_t *
+pmap_pde(pmap_t m, vm_map_offset_t v)
+{
+ pd_entry_t *pde;
+
+ pde = pmap64_pde(m, v);
+
+ return pde;
+}
+
+
+/*
+ * return address of mapped pte for vaddr va in pmap pmap.
+ *
+ * In case the pde maps a superpage, return the pde, which, in this case
+ * is the actual page table entry.
+ */
+static inline pt_entry_t *
+pmap_pte(pmap_t pmap, vm_map_offset_t vaddr)
+{
+ pd_entry_t *pde;
+ pd_entry_t newpf;
+ boolean_t is_ept;
+
+ assert(pmap);
+ pde = pmap64_pde(pmap, vaddr);
+
+ is_ept = is_ept_pmap(pmap);
+
+ if (pde && (*pde & PTE_VALID_MASK(is_ept))) {
+ if (*pde & PTE_PS)
+ return pde;
+ newpf = *pde & PG_FRAME;
+ return &((pt_entry_t *)PHYSMAP_PTOV(newpf))
+ [i386_btop(vaddr) & (ppnum_t)(NPTEPG-1)];
+ }
+ return (NULL);
+}
+extern void pmap_alias(
+ vm_offset_t ava,
+ vm_map_offset_t start,
+ vm_map_offset_t end,
+ vm_prot_t prot,
+ unsigned int options);
+
+#if DEBUG
+#define DPRINTF(x...) kprintf(x)
+#else
+#define DPRINTF(x...)
+#endif
+
#endif /* MACH_KERNEL_PRIVATE */
+#endif /* _I386_PMAP_INTERNAL_ */
projects / apple / xnu.git / blobdiff