]>
git.proxmox.com Git - mirror_ubuntu-artful-kernel.git/blob - drivers/kvm/mmu.c
2 * Kernel-based Virtual Machine driver for Linux
4 * This module enables machines with Intel VT-x extensions to run virtual
5 * machines without emulation or binary translation.
9 * Copyright (C) 2006 Qumranet, Inc.
12 * Yaniv Kamay <yaniv@qumranet.com>
13 * Avi Kivity <avi@qumranet.com>
15 * This work is licensed under the terms of the GNU GPL, version 2. See
16 * the COPYING file in the top-level directory.
23 #include <linux/types.h>
24 #include <linux/string.h>
26 #include <linux/highmem.h>
27 #include <linux/module.h>
30 #include <asm/cmpxchg.h>
37 static void kvm_mmu_audit(struct kvm_vcpu
*vcpu
, const char *msg
);
39 static void kvm_mmu_audit(struct kvm_vcpu
*vcpu
, const char *msg
) {}
44 #define pgprintk(x...) do { if (dbg) printk(x); } while (0)
45 #define rmap_printk(x...) do { if (dbg) printk(x); } while (0)
49 #define pgprintk(x...) do { } while (0)
50 #define rmap_printk(x...) do { } while (0)
54 #if defined(MMU_DEBUG) || defined(AUDIT)
59 #define ASSERT(x) do { } while (0)
63 printk(KERN_WARNING "assertion failed %s:%d: %s\n", \
64 __FILE__, __LINE__, #x); \
68 #define PT64_PT_BITS 9
69 #define PT64_ENT_PER_PAGE (1 << PT64_PT_BITS)
70 #define PT32_PT_BITS 10
71 #define PT32_ENT_PER_PAGE (1 << PT32_PT_BITS)
73 #define PT_WRITABLE_SHIFT 1
75 #define PT_PRESENT_MASK (1ULL << 0)
76 #define PT_WRITABLE_MASK (1ULL << PT_WRITABLE_SHIFT)
77 #define PT_USER_MASK (1ULL << 2)
78 #define PT_PWT_MASK (1ULL << 3)
79 #define PT_PCD_MASK (1ULL << 4)
80 #define PT_ACCESSED_MASK (1ULL << 5)
81 #define PT_DIRTY_MASK (1ULL << 6)
82 #define PT_PAGE_SIZE_MASK (1ULL << 7)
83 #define PT_PAT_MASK (1ULL << 7)
84 #define PT_GLOBAL_MASK (1ULL << 8)
85 #define PT64_NX_MASK (1ULL << 63)
87 #define PT_PAT_SHIFT 7
88 #define PT_DIR_PAT_SHIFT 12
89 #define PT_DIR_PAT_MASK (1ULL << PT_DIR_PAT_SHIFT)
91 #define PT32_DIR_PSE36_SIZE 4
92 #define PT32_DIR_PSE36_SHIFT 13
93 #define PT32_DIR_PSE36_MASK (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
96 #define PT_FIRST_AVAIL_BITS_SHIFT 9
97 #define PT64_SECOND_AVAIL_BITS_SHIFT 52
99 #define PT_SHADOW_IO_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
101 #define VALID_PAGE(x) ((x) != INVALID_PAGE)
103 #define PT64_LEVEL_BITS 9
105 #define PT64_LEVEL_SHIFT(level) \
106 ( PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS )
108 #define PT64_LEVEL_MASK(level) \
109 (((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level))
111 #define PT64_INDEX(address, level)\
112 (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1))
115 #define PT32_LEVEL_BITS 10
117 #define PT32_LEVEL_SHIFT(level) \
118 ( PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS )
120 #define PT32_LEVEL_MASK(level) \
121 (((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level))
123 #define PT32_INDEX(address, level)\
124 (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1))
127 #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1))
128 #define PT64_DIR_BASE_ADDR_MASK \
129 (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1))
131 #define PT32_BASE_ADDR_MASK PAGE_MASK
132 #define PT32_DIR_BASE_ADDR_MASK \
133 (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1))
136 #define PFERR_PRESENT_MASK (1U << 0)
137 #define PFERR_WRITE_MASK (1U << 1)
138 #define PFERR_USER_MASK (1U << 2)
139 #define PFERR_FETCH_MASK (1U << 4)
141 #define PT64_ROOT_LEVEL 4
142 #define PT32_ROOT_LEVEL 2
143 #define PT32E_ROOT_LEVEL 3
145 #define PT_DIRECTORY_LEVEL 2
146 #define PT_PAGE_TABLE_LEVEL 1
150 struct kvm_rmap_desc
{
151 u64
*shadow_ptes
[RMAP_EXT
];
152 struct kvm_rmap_desc
*more
;
155 static struct kmem_cache
*pte_chain_cache
;
156 static struct kmem_cache
*rmap_desc_cache
;
157 static struct kmem_cache
*mmu_page_cache
;
158 static struct kmem_cache
*mmu_page_header_cache
;
160 static int is_write_protection(struct kvm_vcpu
*vcpu
)
162 return vcpu
->cr0
& CR0_WP_MASK
;
165 static int is_cpuid_PSE36(void)
170 static int is_nx(struct kvm_vcpu
*vcpu
)
172 return vcpu
->shadow_efer
& EFER_NX
;
175 static int is_present_pte(unsigned long pte
)
177 return pte
& PT_PRESENT_MASK
;
180 static int is_writeble_pte(unsigned long pte
)
182 return pte
& PT_WRITABLE_MASK
;
185 static int is_io_pte(unsigned long pte
)
187 return pte
& PT_SHADOW_IO_MARK
;
190 static int is_rmap_pte(u64 pte
)
192 return (pte
& (PT_WRITABLE_MASK
| PT_PRESENT_MASK
))
193 == (PT_WRITABLE_MASK
| PT_PRESENT_MASK
);
196 static void set_shadow_pte(u64
*sptep
, u64 spte
)
199 set_64bit((unsigned long *)sptep
, spte
);
201 set_64bit((unsigned long long *)sptep
, spte
);
205 static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache
*cache
,
206 struct kmem_cache
*base_cache
, int min
,
211 if (cache
->nobjs
>= min
)
213 while (cache
->nobjs
< ARRAY_SIZE(cache
->objects
)) {
214 obj
= kmem_cache_zalloc(base_cache
, gfp_flags
);
217 cache
->objects
[cache
->nobjs
++] = obj
;
222 static void mmu_free_memory_cache(struct kvm_mmu_memory_cache
*mc
)
225 kfree(mc
->objects
[--mc
->nobjs
]);
228 static int __mmu_topup_memory_caches(struct kvm_vcpu
*vcpu
, gfp_t gfp_flags
)
232 r
= mmu_topup_memory_cache(&vcpu
->mmu_pte_chain_cache
,
233 pte_chain_cache
, 4, gfp_flags
);
236 r
= mmu_topup_memory_cache(&vcpu
->mmu_rmap_desc_cache
,
237 rmap_desc_cache
, 1, gfp_flags
);
240 r
= mmu_topup_memory_cache(&vcpu
->mmu_page_cache
,
241 mmu_page_cache
, 4, gfp_flags
);
244 r
= mmu_topup_memory_cache(&vcpu
->mmu_page_header_cache
,
245 mmu_page_header_cache
, 4, gfp_flags
);
250 static int mmu_topup_memory_caches(struct kvm_vcpu
*vcpu
)
254 r
= __mmu_topup_memory_caches(vcpu
, GFP_NOWAIT
);
256 spin_unlock(&vcpu
->kvm
->lock
);
257 kvm_arch_ops
->vcpu_put(vcpu
);
258 r
= __mmu_topup_memory_caches(vcpu
, GFP_KERNEL
);
259 kvm_arch_ops
->vcpu_load(vcpu
);
260 spin_lock(&vcpu
->kvm
->lock
);
265 static void mmu_free_memory_caches(struct kvm_vcpu
*vcpu
)
267 mmu_free_memory_cache(&vcpu
->mmu_pte_chain_cache
);
268 mmu_free_memory_cache(&vcpu
->mmu_rmap_desc_cache
);
269 mmu_free_memory_cache(&vcpu
->mmu_page_cache
);
270 mmu_free_memory_cache(&vcpu
->mmu_page_header_cache
);
273 static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache
*mc
,
279 p
= mc
->objects
[--mc
->nobjs
];
284 static void mmu_memory_cache_free(struct kvm_mmu_memory_cache
*mc
, void *obj
)
286 if (mc
->nobjs
< KVM_NR_MEM_OBJS
)
287 mc
->objects
[mc
->nobjs
++] = obj
;
292 static struct kvm_pte_chain
*mmu_alloc_pte_chain(struct kvm_vcpu
*vcpu
)
294 return mmu_memory_cache_alloc(&vcpu
->mmu_pte_chain_cache
,
295 sizeof(struct kvm_pte_chain
));
298 static void mmu_free_pte_chain(struct kvm_vcpu
*vcpu
,
299 struct kvm_pte_chain
*pc
)
301 mmu_memory_cache_free(&vcpu
->mmu_pte_chain_cache
, pc
);
304 static struct kvm_rmap_desc
*mmu_alloc_rmap_desc(struct kvm_vcpu
*vcpu
)
306 return mmu_memory_cache_alloc(&vcpu
->mmu_rmap_desc_cache
,
307 sizeof(struct kvm_rmap_desc
));
310 static void mmu_free_rmap_desc(struct kvm_vcpu
*vcpu
,
311 struct kvm_rmap_desc
*rd
)
313 mmu_memory_cache_free(&vcpu
->mmu_rmap_desc_cache
, rd
);
317 * Reverse mapping data structures:
319 * If page->private bit zero is zero, then page->private points to the
320 * shadow page table entry that points to page_address(page).
322 * If page->private bit zero is one, (then page->private & ~1) points
323 * to a struct kvm_rmap_desc containing more mappings.
325 static void rmap_add(struct kvm_vcpu
*vcpu
, u64
*spte
)
328 struct kvm_rmap_desc
*desc
;
331 if (!is_rmap_pte(*spte
))
333 page
= pfn_to_page((*spte
& PT64_BASE_ADDR_MASK
) >> PAGE_SHIFT
);
334 if (!page_private(page
)) {
335 rmap_printk("rmap_add: %p %llx 0->1\n", spte
, *spte
);
336 set_page_private(page
,(unsigned long)spte
);
337 } else if (!(page_private(page
) & 1)) {
338 rmap_printk("rmap_add: %p %llx 1->many\n", spte
, *spte
);
339 desc
= mmu_alloc_rmap_desc(vcpu
);
340 desc
->shadow_ptes
[0] = (u64
*)page_private(page
);
341 desc
->shadow_ptes
[1] = spte
;
342 set_page_private(page
,(unsigned long)desc
| 1);
344 rmap_printk("rmap_add: %p %llx many->many\n", spte
, *spte
);
345 desc
= (struct kvm_rmap_desc
*)(page_private(page
) & ~1ul);
346 while (desc
->shadow_ptes
[RMAP_EXT
-1] && desc
->more
)
348 if (desc
->shadow_ptes
[RMAP_EXT
-1]) {
349 desc
->more
= mmu_alloc_rmap_desc(vcpu
);
352 for (i
= 0; desc
->shadow_ptes
[i
]; ++i
)
354 desc
->shadow_ptes
[i
] = spte
;
358 static void rmap_desc_remove_entry(struct kvm_vcpu
*vcpu
,
360 struct kvm_rmap_desc
*desc
,
362 struct kvm_rmap_desc
*prev_desc
)
366 for (j
= RMAP_EXT
- 1; !desc
->shadow_ptes
[j
] && j
> i
; --j
)
368 desc
->shadow_ptes
[i
] = desc
->shadow_ptes
[j
];
369 desc
->shadow_ptes
[j
] = NULL
;
372 if (!prev_desc
&& !desc
->more
)
373 set_page_private(page
,(unsigned long)desc
->shadow_ptes
[0]);
376 prev_desc
->more
= desc
->more
;
378 set_page_private(page
,(unsigned long)desc
->more
| 1);
379 mmu_free_rmap_desc(vcpu
, desc
);
382 static void rmap_remove(struct kvm_vcpu
*vcpu
, u64
*spte
)
385 struct kvm_rmap_desc
*desc
;
386 struct kvm_rmap_desc
*prev_desc
;
389 if (!is_rmap_pte(*spte
))
391 page
= pfn_to_page((*spte
& PT64_BASE_ADDR_MASK
) >> PAGE_SHIFT
);
392 if (!page_private(page
)) {
393 printk(KERN_ERR
"rmap_remove: %p %llx 0->BUG\n", spte
, *spte
);
395 } else if (!(page_private(page
) & 1)) {
396 rmap_printk("rmap_remove: %p %llx 1->0\n", spte
, *spte
);
397 if ((u64
*)page_private(page
) != spte
) {
398 printk(KERN_ERR
"rmap_remove: %p %llx 1->BUG\n",
402 set_page_private(page
,0);
404 rmap_printk("rmap_remove: %p %llx many->many\n", spte
, *spte
);
405 desc
= (struct kvm_rmap_desc
*)(page_private(page
) & ~1ul);
408 for (i
= 0; i
< RMAP_EXT
&& desc
->shadow_ptes
[i
]; ++i
)
409 if (desc
->shadow_ptes
[i
] == spte
) {
410 rmap_desc_remove_entry(vcpu
, page
,
422 static void rmap_write_protect(struct kvm_vcpu
*vcpu
, u64 gfn
)
424 struct kvm
*kvm
= vcpu
->kvm
;
426 struct kvm_rmap_desc
*desc
;
429 page
= gfn_to_page(kvm
, gfn
);
432 while (page_private(page
)) {
433 if (!(page_private(page
) & 1))
434 spte
= (u64
*)page_private(page
);
436 desc
= (struct kvm_rmap_desc
*)(page_private(page
) & ~1ul);
437 spte
= desc
->shadow_ptes
[0];
440 BUG_ON((*spte
& PT64_BASE_ADDR_MASK
) >> PAGE_SHIFT
441 != page_to_pfn(page
));
442 BUG_ON(!(*spte
& PT_PRESENT_MASK
));
443 BUG_ON(!(*spte
& PT_WRITABLE_MASK
));
444 rmap_printk("rmap_write_protect: spte %p %llx\n", spte
, *spte
);
445 rmap_remove(vcpu
, spte
);
446 set_shadow_pte(spte
, *spte
& ~PT_WRITABLE_MASK
);
447 kvm_flush_remote_tlbs(vcpu
->kvm
);
452 static int is_empty_shadow_page(u64
*spt
)
457 for (pos
= spt
, end
= pos
+ PAGE_SIZE
/ sizeof(u64
); pos
!= end
; pos
++)
459 printk(KERN_ERR
"%s: %p %llx\n", __FUNCTION__
,
467 static void kvm_mmu_free_page(struct kvm_vcpu
*vcpu
,
468 struct kvm_mmu_page
*page_head
)
470 ASSERT(is_empty_shadow_page(page_head
->spt
));
471 list_del(&page_head
->link
);
472 mmu_memory_cache_free(&vcpu
->mmu_page_cache
, page_head
->spt
);
473 mmu_memory_cache_free(&vcpu
->mmu_page_header_cache
, page_head
);
474 ++vcpu
->kvm
->n_free_mmu_pages
;
477 static unsigned kvm_page_table_hashfn(gfn_t gfn
)
482 static struct kvm_mmu_page
*kvm_mmu_alloc_page(struct kvm_vcpu
*vcpu
,
485 struct kvm_mmu_page
*page
;
487 if (!vcpu
->kvm
->n_free_mmu_pages
)
490 page
= mmu_memory_cache_alloc(&vcpu
->mmu_page_header_cache
,
492 page
->spt
= mmu_memory_cache_alloc(&vcpu
->mmu_page_cache
, PAGE_SIZE
);
493 set_page_private(virt_to_page(page
->spt
), (unsigned long)page
);
494 list_add(&page
->link
, &vcpu
->kvm
->active_mmu_pages
);
495 ASSERT(is_empty_shadow_page(page
->spt
));
496 page
->slot_bitmap
= 0;
497 page
->multimapped
= 0;
498 page
->parent_pte
= parent_pte
;
499 --vcpu
->kvm
->n_free_mmu_pages
;
503 static void mmu_page_add_parent_pte(struct kvm_vcpu
*vcpu
,
504 struct kvm_mmu_page
*page
, u64
*parent_pte
)
506 struct kvm_pte_chain
*pte_chain
;
507 struct hlist_node
*node
;
512 if (!page
->multimapped
) {
513 u64
*old
= page
->parent_pte
;
516 page
->parent_pte
= parent_pte
;
519 page
->multimapped
= 1;
520 pte_chain
= mmu_alloc_pte_chain(vcpu
);
521 INIT_HLIST_HEAD(&page
->parent_ptes
);
522 hlist_add_head(&pte_chain
->link
, &page
->parent_ptes
);
523 pte_chain
->parent_ptes
[0] = old
;
525 hlist_for_each_entry(pte_chain
, node
, &page
->parent_ptes
, link
) {
526 if (pte_chain
->parent_ptes
[NR_PTE_CHAIN_ENTRIES
-1])
528 for (i
= 0; i
< NR_PTE_CHAIN_ENTRIES
; ++i
)
529 if (!pte_chain
->parent_ptes
[i
]) {
530 pte_chain
->parent_ptes
[i
] = parent_pte
;
534 pte_chain
= mmu_alloc_pte_chain(vcpu
);
536 hlist_add_head(&pte_chain
->link
, &page
->parent_ptes
);
537 pte_chain
->parent_ptes
[0] = parent_pte
;
540 static void mmu_page_remove_parent_pte(struct kvm_vcpu
*vcpu
,
541 struct kvm_mmu_page
*page
,
544 struct kvm_pte_chain
*pte_chain
;
545 struct hlist_node
*node
;
548 if (!page
->multimapped
) {
549 BUG_ON(page
->parent_pte
!= parent_pte
);
550 page
->parent_pte
= NULL
;
553 hlist_for_each_entry(pte_chain
, node
, &page
->parent_ptes
, link
)
554 for (i
= 0; i
< NR_PTE_CHAIN_ENTRIES
; ++i
) {
555 if (!pte_chain
->parent_ptes
[i
])
557 if (pte_chain
->parent_ptes
[i
] != parent_pte
)
559 while (i
+ 1 < NR_PTE_CHAIN_ENTRIES
560 && pte_chain
->parent_ptes
[i
+ 1]) {
561 pte_chain
->parent_ptes
[i
]
562 = pte_chain
->parent_ptes
[i
+ 1];
565 pte_chain
->parent_ptes
[i
] = NULL
;
567 hlist_del(&pte_chain
->link
);
568 mmu_free_pte_chain(vcpu
, pte_chain
);
569 if (hlist_empty(&page
->parent_ptes
)) {
570 page
->multimapped
= 0;
571 page
->parent_pte
= NULL
;
579 static struct kvm_mmu_page
*kvm_mmu_lookup_page(struct kvm_vcpu
*vcpu
,
583 struct hlist_head
*bucket
;
584 struct kvm_mmu_page
*page
;
585 struct hlist_node
*node
;
587 pgprintk("%s: looking for gfn %lx\n", __FUNCTION__
, gfn
);
588 index
= kvm_page_table_hashfn(gfn
) % KVM_NUM_MMU_PAGES
;
589 bucket
= &vcpu
->kvm
->mmu_page_hash
[index
];
590 hlist_for_each_entry(page
, node
, bucket
, hash_link
)
591 if (page
->gfn
== gfn
&& !page
->role
.metaphysical
) {
592 pgprintk("%s: found role %x\n",
593 __FUNCTION__
, page
->role
.word
);
599 static struct kvm_mmu_page
*kvm_mmu_get_page(struct kvm_vcpu
*vcpu
,
604 unsigned hugepage_access
,
607 union kvm_mmu_page_role role
;
610 struct hlist_head
*bucket
;
611 struct kvm_mmu_page
*page
;
612 struct hlist_node
*node
;
615 role
.glevels
= vcpu
->mmu
.root_level
;
617 role
.metaphysical
= metaphysical
;
618 role
.hugepage_access
= hugepage_access
;
619 if (vcpu
->mmu
.root_level
<= PT32_ROOT_LEVEL
) {
620 quadrant
= gaddr
>> (PAGE_SHIFT
+ (PT64_PT_BITS
* level
));
621 quadrant
&= (1 << ((PT32_PT_BITS
- PT64_PT_BITS
) * level
)) - 1;
622 role
.quadrant
= quadrant
;
624 pgprintk("%s: looking gfn %lx role %x\n", __FUNCTION__
,
626 index
= kvm_page_table_hashfn(gfn
) % KVM_NUM_MMU_PAGES
;
627 bucket
= &vcpu
->kvm
->mmu_page_hash
[index
];
628 hlist_for_each_entry(page
, node
, bucket
, hash_link
)
629 if (page
->gfn
== gfn
&& page
->role
.word
== role
.word
) {
630 mmu_page_add_parent_pte(vcpu
, page
, parent_pte
);
631 pgprintk("%s: found\n", __FUNCTION__
);
634 page
= kvm_mmu_alloc_page(vcpu
, parent_pte
);
637 pgprintk("%s: adding gfn %lx role %x\n", __FUNCTION__
, gfn
, role
.word
);
640 hlist_add_head(&page
->hash_link
, bucket
);
642 rmap_write_protect(vcpu
, gfn
);
646 static void kvm_mmu_page_unlink_children(struct kvm_vcpu
*vcpu
,
647 struct kvm_mmu_page
*page
)
655 if (page
->role
.level
== PT_PAGE_TABLE_LEVEL
) {
656 for (i
= 0; i
< PT64_ENT_PER_PAGE
; ++i
) {
657 if (pt
[i
] & PT_PRESENT_MASK
)
658 rmap_remove(vcpu
, &pt
[i
]);
661 kvm_flush_remote_tlbs(vcpu
->kvm
);
665 for (i
= 0; i
< PT64_ENT_PER_PAGE
; ++i
) {
669 if (!(ent
& PT_PRESENT_MASK
))
671 ent
&= PT64_BASE_ADDR_MASK
;
672 mmu_page_remove_parent_pte(vcpu
, page_header(ent
), &pt
[i
]);
674 kvm_flush_remote_tlbs(vcpu
->kvm
);
677 static void kvm_mmu_put_page(struct kvm_vcpu
*vcpu
,
678 struct kvm_mmu_page
*page
,
681 mmu_page_remove_parent_pte(vcpu
, page
, parent_pte
);
684 static void kvm_mmu_zap_page(struct kvm_vcpu
*vcpu
,
685 struct kvm_mmu_page
*page
)
689 while (page
->multimapped
|| page
->parent_pte
) {
690 if (!page
->multimapped
)
691 parent_pte
= page
->parent_pte
;
693 struct kvm_pte_chain
*chain
;
695 chain
= container_of(page
->parent_ptes
.first
,
696 struct kvm_pte_chain
, link
);
697 parent_pte
= chain
->parent_ptes
[0];
700 kvm_mmu_put_page(vcpu
, page
, parent_pte
);
701 set_shadow_pte(parent_pte
, 0);
703 kvm_mmu_page_unlink_children(vcpu
, page
);
704 if (!page
->root_count
) {
705 hlist_del(&page
->hash_link
);
706 kvm_mmu_free_page(vcpu
, page
);
708 list_move(&page
->link
, &vcpu
->kvm
->active_mmu_pages
);
711 static int kvm_mmu_unprotect_page(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
714 struct hlist_head
*bucket
;
715 struct kvm_mmu_page
*page
;
716 struct hlist_node
*node
, *n
;
719 pgprintk("%s: looking for gfn %lx\n", __FUNCTION__
, gfn
);
721 index
= kvm_page_table_hashfn(gfn
) % KVM_NUM_MMU_PAGES
;
722 bucket
= &vcpu
->kvm
->mmu_page_hash
[index
];
723 hlist_for_each_entry_safe(page
, node
, n
, bucket
, hash_link
)
724 if (page
->gfn
== gfn
&& !page
->role
.metaphysical
) {
725 pgprintk("%s: gfn %lx role %x\n", __FUNCTION__
, gfn
,
727 kvm_mmu_zap_page(vcpu
, page
);
733 static void mmu_unshadow(struct kvm_vcpu
*vcpu
, gfn_t gfn
)
735 struct kvm_mmu_page
*page
;
737 while ((page
= kvm_mmu_lookup_page(vcpu
, gfn
)) != NULL
) {
738 pgprintk("%s: zap %lx %x\n",
739 __FUNCTION__
, gfn
, page
->role
.word
);
740 kvm_mmu_zap_page(vcpu
, page
);
744 static void page_header_update_slot(struct kvm
*kvm
, void *pte
, gpa_t gpa
)
746 int slot
= memslot_id(kvm
, gfn_to_memslot(kvm
, gpa
>> PAGE_SHIFT
));
747 struct kvm_mmu_page
*page_head
= page_header(__pa(pte
));
749 __set_bit(slot
, &page_head
->slot_bitmap
);
752 hpa_t
safe_gpa_to_hpa(struct kvm_vcpu
*vcpu
, gpa_t gpa
)
754 hpa_t hpa
= gpa_to_hpa(vcpu
, gpa
);
756 return is_error_hpa(hpa
) ? bad_page_address
| (gpa
& ~PAGE_MASK
): hpa
;
759 hpa_t
gpa_to_hpa(struct kvm_vcpu
*vcpu
, gpa_t gpa
)
763 ASSERT((gpa
& HPA_ERR_MASK
) == 0);
764 page
= gfn_to_page(vcpu
->kvm
, gpa
>> PAGE_SHIFT
);
766 return gpa
| HPA_ERR_MASK
;
767 return ((hpa_t
)page_to_pfn(page
) << PAGE_SHIFT
)
768 | (gpa
& (PAGE_SIZE
-1));
771 hpa_t
gva_to_hpa(struct kvm_vcpu
*vcpu
, gva_t gva
)
773 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, gva
);
775 if (gpa
== UNMAPPED_GVA
)
777 return gpa_to_hpa(vcpu
, gpa
);
780 struct page
*gva_to_page(struct kvm_vcpu
*vcpu
, gva_t gva
)
782 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, gva
);
784 if (gpa
== UNMAPPED_GVA
)
786 return pfn_to_page(gpa_to_hpa(vcpu
, gpa
) >> PAGE_SHIFT
);
789 static void nonpaging_new_cr3(struct kvm_vcpu
*vcpu
)
793 static int nonpaging_map(struct kvm_vcpu
*vcpu
, gva_t v
, hpa_t p
)
795 int level
= PT32E_ROOT_LEVEL
;
796 hpa_t table_addr
= vcpu
->mmu
.root_hpa
;
799 u32 index
= PT64_INDEX(v
, level
);
803 ASSERT(VALID_PAGE(table_addr
));
804 table
= __va(table_addr
);
808 if (is_present_pte(pte
) && is_writeble_pte(pte
))
810 mark_page_dirty(vcpu
->kvm
, v
>> PAGE_SHIFT
);
811 page_header_update_slot(vcpu
->kvm
, table
, v
);
812 table
[index
] = p
| PT_PRESENT_MASK
| PT_WRITABLE_MASK
|
814 rmap_add(vcpu
, &table
[index
]);
818 if (table
[index
] == 0) {
819 struct kvm_mmu_page
*new_table
;
822 pseudo_gfn
= (v
& PT64_DIR_BASE_ADDR_MASK
)
824 new_table
= kvm_mmu_get_page(vcpu
, pseudo_gfn
,
826 1, 0, &table
[index
]);
828 pgprintk("nonpaging_map: ENOMEM\n");
832 table
[index
] = __pa(new_table
->spt
) | PT_PRESENT_MASK
833 | PT_WRITABLE_MASK
| PT_USER_MASK
;
835 table_addr
= table
[index
] & PT64_BASE_ADDR_MASK
;
839 static void mmu_free_roots(struct kvm_vcpu
*vcpu
)
842 struct kvm_mmu_page
*page
;
844 if (!VALID_PAGE(vcpu
->mmu
.root_hpa
))
847 if (vcpu
->mmu
.shadow_root_level
== PT64_ROOT_LEVEL
) {
848 hpa_t root
= vcpu
->mmu
.root_hpa
;
850 page
= page_header(root
);
852 vcpu
->mmu
.root_hpa
= INVALID_PAGE
;
856 for (i
= 0; i
< 4; ++i
) {
857 hpa_t root
= vcpu
->mmu
.pae_root
[i
];
860 root
&= PT64_BASE_ADDR_MASK
;
861 page
= page_header(root
);
864 vcpu
->mmu
.pae_root
[i
] = INVALID_PAGE
;
866 vcpu
->mmu
.root_hpa
= INVALID_PAGE
;
869 static void mmu_alloc_roots(struct kvm_vcpu
*vcpu
)
873 struct kvm_mmu_page
*page
;
875 root_gfn
= vcpu
->cr3
>> PAGE_SHIFT
;
878 if (vcpu
->mmu
.shadow_root_level
== PT64_ROOT_LEVEL
) {
879 hpa_t root
= vcpu
->mmu
.root_hpa
;
881 ASSERT(!VALID_PAGE(root
));
882 page
= kvm_mmu_get_page(vcpu
, root_gfn
, 0,
883 PT64_ROOT_LEVEL
, 0, 0, NULL
);
884 root
= __pa(page
->spt
);
886 vcpu
->mmu
.root_hpa
= root
;
890 for (i
= 0; i
< 4; ++i
) {
891 hpa_t root
= vcpu
->mmu
.pae_root
[i
];
893 ASSERT(!VALID_PAGE(root
));
894 if (vcpu
->mmu
.root_level
== PT32E_ROOT_LEVEL
) {
895 if (!is_present_pte(vcpu
->pdptrs
[i
])) {
896 vcpu
->mmu
.pae_root
[i
] = 0;
899 root_gfn
= vcpu
->pdptrs
[i
] >> PAGE_SHIFT
;
900 } else if (vcpu
->mmu
.root_level
== 0)
902 page
= kvm_mmu_get_page(vcpu
, root_gfn
, i
<< 30,
903 PT32_ROOT_LEVEL
, !is_paging(vcpu
),
905 root
= __pa(page
->spt
);
907 vcpu
->mmu
.pae_root
[i
] = root
| PT_PRESENT_MASK
;
909 vcpu
->mmu
.root_hpa
= __pa(vcpu
->mmu
.pae_root
);
912 static gpa_t
nonpaging_gva_to_gpa(struct kvm_vcpu
*vcpu
, gva_t vaddr
)
917 static int nonpaging_page_fault(struct kvm_vcpu
*vcpu
, gva_t gva
,
924 r
= mmu_topup_memory_caches(vcpu
);
929 ASSERT(VALID_PAGE(vcpu
->mmu
.root_hpa
));
932 paddr
= gpa_to_hpa(vcpu
, addr
& PT64_BASE_ADDR_MASK
);
934 if (is_error_hpa(paddr
))
937 return nonpaging_map(vcpu
, addr
& PAGE_MASK
, paddr
);
940 static void nonpaging_free(struct kvm_vcpu
*vcpu
)
942 mmu_free_roots(vcpu
);
945 static int nonpaging_init_context(struct kvm_vcpu
*vcpu
)
947 struct kvm_mmu
*context
= &vcpu
->mmu
;
949 context
->new_cr3
= nonpaging_new_cr3
;
950 context
->page_fault
= nonpaging_page_fault
;
951 context
->gva_to_gpa
= nonpaging_gva_to_gpa
;
952 context
->free
= nonpaging_free
;
953 context
->root_level
= 0;
954 context
->shadow_root_level
= PT32E_ROOT_LEVEL
;
955 context
->root_hpa
= INVALID_PAGE
;
959 static void kvm_mmu_flush_tlb(struct kvm_vcpu
*vcpu
)
961 ++vcpu
->stat
.tlb_flush
;
962 kvm_arch_ops
->tlb_flush(vcpu
);
965 static void paging_new_cr3(struct kvm_vcpu
*vcpu
)
967 pgprintk("%s: cr3 %lx\n", __FUNCTION__
, vcpu
->cr3
);
968 mmu_free_roots(vcpu
);
971 static void inject_page_fault(struct kvm_vcpu
*vcpu
,
975 kvm_arch_ops
->inject_page_fault(vcpu
, addr
, err_code
);
978 static void paging_free(struct kvm_vcpu
*vcpu
)
980 nonpaging_free(vcpu
);
984 #include "paging_tmpl.h"
988 #include "paging_tmpl.h"
991 static int paging64_init_context_common(struct kvm_vcpu
*vcpu
, int level
)
993 struct kvm_mmu
*context
= &vcpu
->mmu
;
995 ASSERT(is_pae(vcpu
));
996 context
->new_cr3
= paging_new_cr3
;
997 context
->page_fault
= paging64_page_fault
;
998 context
->gva_to_gpa
= paging64_gva_to_gpa
;
999 context
->free
= paging_free
;
1000 context
->root_level
= level
;
1001 context
->shadow_root_level
= level
;
1002 context
->root_hpa
= INVALID_PAGE
;
1006 static int paging64_init_context(struct kvm_vcpu
*vcpu
)
1008 return paging64_init_context_common(vcpu
, PT64_ROOT_LEVEL
);
1011 static int paging32_init_context(struct kvm_vcpu
*vcpu
)
1013 struct kvm_mmu
*context
= &vcpu
->mmu
;
1015 context
->new_cr3
= paging_new_cr3
;
1016 context
->page_fault
= paging32_page_fault
;
1017 context
->gva_to_gpa
= paging32_gva_to_gpa
;
1018 context
->free
= paging_free
;
1019 context
->root_level
= PT32_ROOT_LEVEL
;
1020 context
->shadow_root_level
= PT32E_ROOT_LEVEL
;
1021 context
->root_hpa
= INVALID_PAGE
;
1025 static int paging32E_init_context(struct kvm_vcpu
*vcpu
)
1027 return paging64_init_context_common(vcpu
, PT32E_ROOT_LEVEL
);
1030 static int init_kvm_mmu(struct kvm_vcpu
*vcpu
)
1033 ASSERT(!VALID_PAGE(vcpu
->mmu
.root_hpa
));
1035 if (!is_paging(vcpu
))
1036 return nonpaging_init_context(vcpu
);
1037 else if (is_long_mode(vcpu
))
1038 return paging64_init_context(vcpu
);
1039 else if (is_pae(vcpu
))
1040 return paging32E_init_context(vcpu
);
1042 return paging32_init_context(vcpu
);
1045 static void destroy_kvm_mmu(struct kvm_vcpu
*vcpu
)
1048 if (VALID_PAGE(vcpu
->mmu
.root_hpa
)) {
1049 vcpu
->mmu
.free(vcpu
);
1050 vcpu
->mmu
.root_hpa
= INVALID_PAGE
;
1054 int kvm_mmu_reset_context(struct kvm_vcpu
*vcpu
)
1056 destroy_kvm_mmu(vcpu
);
1057 return init_kvm_mmu(vcpu
);
1060 int kvm_mmu_load(struct kvm_vcpu
*vcpu
)
1064 spin_lock(&vcpu
->kvm
->lock
);
1065 r
= mmu_topup_memory_caches(vcpu
);
1068 mmu_alloc_roots(vcpu
);
1069 kvm_arch_ops
->set_cr3(vcpu
, vcpu
->mmu
.root_hpa
);
1070 kvm_mmu_flush_tlb(vcpu
);
1072 spin_unlock(&vcpu
->kvm
->lock
);
1075 EXPORT_SYMBOL_GPL(kvm_mmu_load
);
1077 void kvm_mmu_unload(struct kvm_vcpu
*vcpu
)
1079 mmu_free_roots(vcpu
);
1082 static void mmu_pte_write_zap_pte(struct kvm_vcpu
*vcpu
,
1083 struct kvm_mmu_page
*page
,
1087 struct kvm_mmu_page
*child
;
1090 if (is_present_pte(pte
)) {
1091 if (page
->role
.level
== PT_PAGE_TABLE_LEVEL
)
1092 rmap_remove(vcpu
, spte
);
1094 child
= page_header(pte
& PT64_BASE_ADDR_MASK
);
1095 mmu_page_remove_parent_pte(vcpu
, child
, spte
);
1099 kvm_flush_remote_tlbs(vcpu
->kvm
);
1102 static void mmu_pte_write_new_pte(struct kvm_vcpu
*vcpu
,
1103 struct kvm_mmu_page
*page
,
1105 const void *new, int bytes
)
1107 if (page
->role
.level
!= PT_PAGE_TABLE_LEVEL
)
1110 if (page
->role
.glevels
== PT32_ROOT_LEVEL
)
1111 paging32_update_pte(vcpu
, page
, spte
, new, bytes
);
1113 paging64_update_pte(vcpu
, page
, spte
, new, bytes
);
1116 void kvm_mmu_pte_write(struct kvm_vcpu
*vcpu
, gpa_t gpa
,
1117 const u8
*old
, const u8
*new, int bytes
)
1119 gfn_t gfn
= gpa
>> PAGE_SHIFT
;
1120 struct kvm_mmu_page
*page
;
1121 struct hlist_node
*node
, *n
;
1122 struct hlist_head
*bucket
;
1125 unsigned offset
= offset_in_page(gpa
);
1127 unsigned page_offset
;
1128 unsigned misaligned
;
1134 pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__
, gpa
, bytes
);
1135 if (gfn
== vcpu
->last_pt_write_gfn
) {
1136 ++vcpu
->last_pt_write_count
;
1137 if (vcpu
->last_pt_write_count
>= 3)
1140 vcpu
->last_pt_write_gfn
= gfn
;
1141 vcpu
->last_pt_write_count
= 1;
1143 index
= kvm_page_table_hashfn(gfn
) % KVM_NUM_MMU_PAGES
;
1144 bucket
= &vcpu
->kvm
->mmu_page_hash
[index
];
1145 hlist_for_each_entry_safe(page
, node
, n
, bucket
, hash_link
) {
1146 if (page
->gfn
!= gfn
|| page
->role
.metaphysical
)
1148 pte_size
= page
->role
.glevels
== PT32_ROOT_LEVEL
? 4 : 8;
1149 misaligned
= (offset
^ (offset
+ bytes
- 1)) & ~(pte_size
- 1);
1150 misaligned
|= bytes
< 4;
1151 if (misaligned
|| flooded
) {
1153 * Misaligned accesses are too much trouble to fix
1154 * up; also, they usually indicate a page is not used
1157 * If we're seeing too many writes to a page,
1158 * it may no longer be a page table, or we may be
1159 * forking, in which case it is better to unmap the
1162 pgprintk("misaligned: gpa %llx bytes %d role %x\n",
1163 gpa
, bytes
, page
->role
.word
);
1164 kvm_mmu_zap_page(vcpu
, page
);
1167 page_offset
= offset
;
1168 level
= page
->role
.level
;
1170 if (page
->role
.glevels
== PT32_ROOT_LEVEL
) {
1171 page_offset
<<= 1; /* 32->64 */
1173 * A 32-bit pde maps 4MB while the shadow pdes map
1174 * only 2MB. So we need to double the offset again
1175 * and zap two pdes instead of one.
1177 if (level
== PT32_ROOT_LEVEL
) {
1178 page_offset
&= ~7; /* kill rounding error */
1182 quadrant
= page_offset
>> PAGE_SHIFT
;
1183 page_offset
&= ~PAGE_MASK
;
1184 if (quadrant
!= page
->role
.quadrant
)
1187 spte
= &page
->spt
[page_offset
/ sizeof(*spte
)];
1189 mmu_pte_write_zap_pte(vcpu
, page
, spte
);
1190 mmu_pte_write_new_pte(vcpu
, page
, spte
, new, bytes
);
1196 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu
*vcpu
, gva_t gva
)
1198 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, gva
);
1200 return kvm_mmu_unprotect_page(vcpu
, gpa
>> PAGE_SHIFT
);
1203 void kvm_mmu_free_some_pages(struct kvm_vcpu
*vcpu
)
1205 while (vcpu
->kvm
->n_free_mmu_pages
< KVM_REFILL_PAGES
) {
1206 struct kvm_mmu_page
*page
;
1208 page
= container_of(vcpu
->kvm
->active_mmu_pages
.prev
,
1209 struct kvm_mmu_page
, link
);
1210 kvm_mmu_zap_page(vcpu
, page
);
1213 EXPORT_SYMBOL_GPL(kvm_mmu_free_some_pages
);
1215 static void free_mmu_pages(struct kvm_vcpu
*vcpu
)
1217 struct kvm_mmu_page
*page
;
1219 while (!list_empty(&vcpu
->kvm
->active_mmu_pages
)) {
1220 page
= container_of(vcpu
->kvm
->active_mmu_pages
.next
,
1221 struct kvm_mmu_page
, link
);
1222 kvm_mmu_zap_page(vcpu
, page
);
1224 free_page((unsigned long)vcpu
->mmu
.pae_root
);
1227 static int alloc_mmu_pages(struct kvm_vcpu
*vcpu
)
1234 vcpu
->kvm
->n_free_mmu_pages
= KVM_NUM_MMU_PAGES
;
1237 * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
1238 * Therefore we need to allocate shadow page tables in the first
1239 * 4GB of memory, which happens to fit the DMA32 zone.
1241 page
= alloc_page(GFP_KERNEL
| __GFP_DMA32
);
1244 vcpu
->mmu
.pae_root
= page_address(page
);
1245 for (i
= 0; i
< 4; ++i
)
1246 vcpu
->mmu
.pae_root
[i
] = INVALID_PAGE
;
1251 free_mmu_pages(vcpu
);
1255 int kvm_mmu_create(struct kvm_vcpu
*vcpu
)
1258 ASSERT(!VALID_PAGE(vcpu
->mmu
.root_hpa
));
1260 return alloc_mmu_pages(vcpu
);
1263 int kvm_mmu_setup(struct kvm_vcpu
*vcpu
)
1266 ASSERT(!VALID_PAGE(vcpu
->mmu
.root_hpa
));
1268 return init_kvm_mmu(vcpu
);
1271 void kvm_mmu_destroy(struct kvm_vcpu
*vcpu
)
1275 destroy_kvm_mmu(vcpu
);
1276 free_mmu_pages(vcpu
);
1277 mmu_free_memory_caches(vcpu
);
1280 void kvm_mmu_slot_remove_write_access(struct kvm_vcpu
*vcpu
, int slot
)
1282 struct kvm
*kvm
= vcpu
->kvm
;
1283 struct kvm_mmu_page
*page
;
1285 list_for_each_entry(page
, &kvm
->active_mmu_pages
, link
) {
1289 if (!test_bit(slot
, &page
->slot_bitmap
))
1293 for (i
= 0; i
< PT64_ENT_PER_PAGE
; ++i
)
1295 if (pt
[i
] & PT_WRITABLE_MASK
) {
1296 rmap_remove(vcpu
, &pt
[i
]);
1297 pt
[i
] &= ~PT_WRITABLE_MASK
;
1302 void kvm_mmu_zap_all(struct kvm_vcpu
*vcpu
)
1304 destroy_kvm_mmu(vcpu
);
1306 while (!list_empty(&vcpu
->kvm
->active_mmu_pages
)) {
1307 struct kvm_mmu_page
*page
;
1309 page
= container_of(vcpu
->kvm
->active_mmu_pages
.next
,
1310 struct kvm_mmu_page
, link
);
1311 kvm_mmu_zap_page(vcpu
, page
);
1314 mmu_free_memory_caches(vcpu
);
1315 kvm_flush_remote_tlbs(vcpu
->kvm
);
1319 void kvm_mmu_module_exit(void)
1321 if (pte_chain_cache
)
1322 kmem_cache_destroy(pte_chain_cache
);
1323 if (rmap_desc_cache
)
1324 kmem_cache_destroy(rmap_desc_cache
);
1326 kmem_cache_destroy(mmu_page_cache
);
1327 if (mmu_page_header_cache
)
1328 kmem_cache_destroy(mmu_page_header_cache
);
1331 int kvm_mmu_module_init(void)
1333 pte_chain_cache
= kmem_cache_create("kvm_pte_chain",
1334 sizeof(struct kvm_pte_chain
),
1336 if (!pte_chain_cache
)
1338 rmap_desc_cache
= kmem_cache_create("kvm_rmap_desc",
1339 sizeof(struct kvm_rmap_desc
),
1341 if (!rmap_desc_cache
)
1344 mmu_page_cache
= kmem_cache_create("kvm_mmu_page",
1346 PAGE_SIZE
, 0, NULL
);
1347 if (!mmu_page_cache
)
1350 mmu_page_header_cache
= kmem_cache_create("kvm_mmu_page_header",
1351 sizeof(struct kvm_mmu_page
),
1353 if (!mmu_page_header_cache
)
1359 kvm_mmu_module_exit();
1365 static const char *audit_msg
;
1367 static gva_t
canonicalize(gva_t gva
)
1369 #ifdef CONFIG_X86_64
1370 gva
= (long long)(gva
<< 16) >> 16;
1375 static void audit_mappings_page(struct kvm_vcpu
*vcpu
, u64 page_pte
,
1376 gva_t va
, int level
)
1378 u64
*pt
= __va(page_pte
& PT64_BASE_ADDR_MASK
);
1380 gva_t va_delta
= 1ul << (PAGE_SHIFT
+ 9 * (level
- 1));
1382 for (i
= 0; i
< PT64_ENT_PER_PAGE
; ++i
, va
+= va_delta
) {
1385 if (!(ent
& PT_PRESENT_MASK
))
1388 va
= canonicalize(va
);
1390 audit_mappings_page(vcpu
, ent
, va
, level
- 1);
1392 gpa_t gpa
= vcpu
->mmu
.gva_to_gpa(vcpu
, va
);
1393 hpa_t hpa
= gpa_to_hpa(vcpu
, gpa
);
1395 if ((ent
& PT_PRESENT_MASK
)
1396 && (ent
& PT64_BASE_ADDR_MASK
) != hpa
)
1397 printk(KERN_ERR
"audit error: (%s) levels %d"
1398 " gva %lx gpa %llx hpa %llx ent %llx\n",
1399 audit_msg
, vcpu
->mmu
.root_level
,
1405 static void audit_mappings(struct kvm_vcpu
*vcpu
)
1409 if (vcpu
->mmu
.root_level
== 4)
1410 audit_mappings_page(vcpu
, vcpu
->mmu
.root_hpa
, 0, 4);
1412 for (i
= 0; i
< 4; ++i
)
1413 if (vcpu
->mmu
.pae_root
[i
] & PT_PRESENT_MASK
)
1414 audit_mappings_page(vcpu
,
1415 vcpu
->mmu
.pae_root
[i
],
1420 static int count_rmaps(struct kvm_vcpu
*vcpu
)
1425 for (i
= 0; i
< KVM_MEMORY_SLOTS
; ++i
) {
1426 struct kvm_memory_slot
*m
= &vcpu
->kvm
->memslots
[i
];
1427 struct kvm_rmap_desc
*d
;
1429 for (j
= 0; j
< m
->npages
; ++j
) {
1430 struct page
*page
= m
->phys_mem
[j
];
1434 if (!(page
->private & 1)) {
1438 d
= (struct kvm_rmap_desc
*)(page
->private & ~1ul);
1440 for (k
= 0; k
< RMAP_EXT
; ++k
)
1441 if (d
->shadow_ptes
[k
])
1452 static int count_writable_mappings(struct kvm_vcpu
*vcpu
)
1455 struct kvm_mmu_page
*page
;
1458 list_for_each_entry(page
, &vcpu
->kvm
->active_mmu_pages
, link
) {
1459 u64
*pt
= page
->spt
;
1461 if (page
->role
.level
!= PT_PAGE_TABLE_LEVEL
)
1464 for (i
= 0; i
< PT64_ENT_PER_PAGE
; ++i
) {
1467 if (!(ent
& PT_PRESENT_MASK
))
1469 if (!(ent
& PT_WRITABLE_MASK
))
1477 static void audit_rmap(struct kvm_vcpu
*vcpu
)
1479 int n_rmap
= count_rmaps(vcpu
);
1480 int n_actual
= count_writable_mappings(vcpu
);
1482 if (n_rmap
!= n_actual
)
1483 printk(KERN_ERR
"%s: (%s) rmap %d actual %d\n",
1484 __FUNCTION__
, audit_msg
, n_rmap
, n_actual
);
1487 static void audit_write_protection(struct kvm_vcpu
*vcpu
)
1489 struct kvm_mmu_page
*page
;
1491 list_for_each_entry(page
, &vcpu
->kvm
->active_mmu_pages
, link
) {
1495 if (page
->role
.metaphysical
)
1498 hfn
= gpa_to_hpa(vcpu
, (gpa_t
)page
->gfn
<< PAGE_SHIFT
)
1500 pg
= pfn_to_page(hfn
);
1502 printk(KERN_ERR
"%s: (%s) shadow page has writable"
1503 " mappings: gfn %lx role %x\n",
1504 __FUNCTION__
, audit_msg
, page
->gfn
,
1509 static void kvm_mmu_audit(struct kvm_vcpu
*vcpu
, const char *msg
)
1516 audit_write_protection(vcpu
);
1517 audit_mappings(vcpu
);