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 \
94 (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
97 #define PT_FIRST_AVAIL_BITS_SHIFT 9
98 #define PT64_SECOND_AVAIL_BITS_SHIFT 52
100 #define PT_SHADOW_IO_MARK (1ULL << PT_FIRST_AVAIL_BITS_SHIFT)
102 #define VALID_PAGE(x) ((x) != INVALID_PAGE)
104 #define PT64_LEVEL_BITS 9
106 #define PT64_LEVEL_SHIFT(level) \
107 (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS)
109 #define PT64_LEVEL_MASK(level) \
110 (((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level))
112 #define PT64_INDEX(address, level)\
113 (((address) >> PT64_LEVEL_SHIFT(level)) & ((1 << PT64_LEVEL_BITS) - 1))
116 #define PT32_LEVEL_BITS 10
118 #define PT32_LEVEL_SHIFT(level) \
119 (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS)
121 #define PT32_LEVEL_MASK(level) \
122 (((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level))
124 #define PT32_INDEX(address, level)\
125 (((address) >> PT32_LEVEL_SHIFT(level)) & ((1 << PT32_LEVEL_BITS) - 1))
128 #define PT64_BASE_ADDR_MASK (((1ULL << 52) - 1) & ~(u64)(PAGE_SIZE-1))
129 #define PT64_DIR_BASE_ADDR_MASK \
130 (PT64_BASE_ADDR_MASK & ~((1ULL << (PAGE_SHIFT + PT64_LEVEL_BITS)) - 1))
132 #define PT32_BASE_ADDR_MASK PAGE_MASK
133 #define PT32_DIR_BASE_ADDR_MASK \
134 (PAGE_MASK & ~((1ULL << (PAGE_SHIFT + PT32_LEVEL_BITS)) - 1))
137 #define PFERR_PRESENT_MASK (1U << 0)
138 #define PFERR_WRITE_MASK (1U << 1)
139 #define PFERR_USER_MASK (1U << 2)
140 #define PFERR_FETCH_MASK (1U << 4)
142 #define PT64_ROOT_LEVEL 4
143 #define PT32_ROOT_LEVEL 2
144 #define PT32E_ROOT_LEVEL 3
146 #define PT_DIRECTORY_LEVEL 2
147 #define PT_PAGE_TABLE_LEVEL 1
151 struct kvm_rmap_desc {
152 u64 *shadow_ptes[RMAP_EXT];
153 struct kvm_rmap_desc *more;
156 static struct kmem_cache *pte_chain_cache;
157 static struct kmem_cache *rmap_desc_cache;
158 static struct kmem_cache *mmu_page_header_cache;
160 static u64 __read_mostly shadow_trap_nonpresent_pte;
161 static u64 __read_mostly shadow_notrap_nonpresent_pte;
163 void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte)
165 shadow_trap_nonpresent_pte = trap_pte;
166 shadow_notrap_nonpresent_pte = notrap_pte;
168 EXPORT_SYMBOL_GPL(kvm_mmu_set_nonpresent_ptes);
170 static int is_write_protection(struct kvm_vcpu *vcpu)
172 return vcpu->cr0 & X86_CR0_WP;
175 static int is_cpuid_PSE36(void)
180 static int is_nx(struct kvm_vcpu *vcpu)
182 return vcpu->shadow_efer & EFER_NX;
185 static int is_present_pte(unsigned long pte)
187 return pte & PT_PRESENT_MASK;
190 static int is_shadow_present_pte(u64 pte)
192 pte &= ~PT_SHADOW_IO_MARK;
193 return pte != shadow_trap_nonpresent_pte
194 && pte != shadow_notrap_nonpresent_pte;
197 static int is_writeble_pte(unsigned long pte)
199 return pte & PT_WRITABLE_MASK;
202 static int is_dirty_pte(unsigned long pte)
204 return pte & PT_DIRTY_MASK;
207 static int is_io_pte(unsigned long pte)
209 return pte & PT_SHADOW_IO_MARK;
212 static int is_rmap_pte(u64 pte)
214 return (pte & (PT_WRITABLE_MASK | PT_PRESENT_MASK))
215 == (PT_WRITABLE_MASK | PT_PRESENT_MASK);
218 static void set_shadow_pte(u64 *sptep, u64 spte)
221 set_64bit((unsigned long *)sptep, spte);
223 set_64bit((unsigned long long *)sptep, spte);
227 static int mmu_topup_memory_cache(struct kvm_mmu_memory_cache *cache,
228 struct kmem_cache *base_cache, int min)
232 if (cache->nobjs >= min)
234 while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
235 obj = kmem_cache_zalloc(base_cache, GFP_KERNEL);
238 cache->objects[cache->nobjs++] = obj;
243 static void mmu_free_memory_cache(struct kvm_mmu_memory_cache *mc)
246 kfree(mc->objects[--mc->nobjs]);
249 static int mmu_topup_memory_cache_page(struct kvm_mmu_memory_cache *cache,
254 if (cache->nobjs >= min)
256 while (cache->nobjs < ARRAY_SIZE(cache->objects)) {
257 page = alloc_page(GFP_KERNEL);
260 set_page_private(page, 0);
261 cache->objects[cache->nobjs++] = page_address(page);
266 static void mmu_free_memory_cache_page(struct kvm_mmu_memory_cache *mc)
269 free_page((unsigned long)mc->objects[--mc->nobjs]);
272 static int mmu_topup_memory_caches(struct kvm_vcpu *vcpu)
276 kvm_mmu_free_some_pages(vcpu);
277 r = mmu_topup_memory_cache(&vcpu->mmu_pte_chain_cache,
281 r = mmu_topup_memory_cache(&vcpu->mmu_rmap_desc_cache,
285 r = mmu_topup_memory_cache_page(&vcpu->mmu_page_cache, 8);
288 r = mmu_topup_memory_cache(&vcpu->mmu_page_header_cache,
289 mmu_page_header_cache, 4);
294 static void mmu_free_memory_caches(struct kvm_vcpu *vcpu)
296 mmu_free_memory_cache(&vcpu->mmu_pte_chain_cache);
297 mmu_free_memory_cache(&vcpu->mmu_rmap_desc_cache);
298 mmu_free_memory_cache_page(&vcpu->mmu_page_cache);
299 mmu_free_memory_cache(&vcpu->mmu_page_header_cache);
302 static void *mmu_memory_cache_alloc(struct kvm_mmu_memory_cache *mc,
308 p = mc->objects[--mc->nobjs];
313 static struct kvm_pte_chain *mmu_alloc_pte_chain(struct kvm_vcpu *vcpu)
315 return mmu_memory_cache_alloc(&vcpu->mmu_pte_chain_cache,
316 sizeof(struct kvm_pte_chain));
319 static void mmu_free_pte_chain(struct kvm_pte_chain *pc)
324 static struct kvm_rmap_desc *mmu_alloc_rmap_desc(struct kvm_vcpu *vcpu)
326 return mmu_memory_cache_alloc(&vcpu->mmu_rmap_desc_cache,
327 sizeof(struct kvm_rmap_desc));
330 static void mmu_free_rmap_desc(struct kvm_rmap_desc *rd)
336 * Take gfn and return the reverse mapping to it.
337 * Note: gfn must be unaliased before this function get called
340 static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn)
342 struct kvm_memory_slot *slot;
344 slot = gfn_to_memslot(kvm, gfn);
345 return &slot->rmap[gfn - slot->base_gfn];
349 * Reverse mapping data structures:
351 * If rmapp bit zero is zero, then rmapp point to the shadw page table entry
352 * that points to page_address(page).
354 * If rmapp bit zero is one, (then rmap & ~1) points to a struct kvm_rmap_desc
355 * containing more mappings.
357 static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
359 struct kvm_mmu_page *page;
360 struct kvm_rmap_desc *desc;
361 unsigned long *rmapp;
364 if (!is_rmap_pte(*spte))
366 gfn = unalias_gfn(vcpu->kvm, gfn);
367 page = page_header(__pa(spte));
368 page->gfns[spte - page->spt] = gfn;
369 rmapp = gfn_to_rmap(vcpu->kvm, gfn);
371 rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte);
372 *rmapp = (unsigned long)spte;
373 } else if (!(*rmapp & 1)) {
374 rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte);
375 desc = mmu_alloc_rmap_desc(vcpu);
376 desc->shadow_ptes[0] = (u64 *)*rmapp;
377 desc->shadow_ptes[1] = spte;
378 *rmapp = (unsigned long)desc | 1;
380 rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte);
381 desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
382 while (desc->shadow_ptes[RMAP_EXT-1] && desc->more)
384 if (desc->shadow_ptes[RMAP_EXT-1]) {
385 desc->more = mmu_alloc_rmap_desc(vcpu);
388 for (i = 0; desc->shadow_ptes[i]; ++i)
390 desc->shadow_ptes[i] = spte;
394 static void rmap_desc_remove_entry(unsigned long *rmapp,
395 struct kvm_rmap_desc *desc,
397 struct kvm_rmap_desc *prev_desc)
401 for (j = RMAP_EXT - 1; !desc->shadow_ptes[j] && j > i; --j)
403 desc->shadow_ptes[i] = desc->shadow_ptes[j];
404 desc->shadow_ptes[j] = NULL;
407 if (!prev_desc && !desc->more)
408 *rmapp = (unsigned long)desc->shadow_ptes[0];
411 prev_desc->more = desc->more;
413 *rmapp = (unsigned long)desc->more | 1;
414 mmu_free_rmap_desc(desc);
417 static void rmap_remove(struct kvm *kvm, u64 *spte)
419 struct kvm_rmap_desc *desc;
420 struct kvm_rmap_desc *prev_desc;
421 struct kvm_mmu_page *page;
422 unsigned long *rmapp;
425 if (!is_rmap_pte(*spte))
427 page = page_header(__pa(spte));
428 rmapp = gfn_to_rmap(kvm, page->gfns[spte - page->spt]);
430 printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte);
432 } else if (!(*rmapp & 1)) {
433 rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte);
434 if ((u64 *)*rmapp != spte) {
435 printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n",
441 rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte);
442 desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
445 for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i)
446 if (desc->shadow_ptes[i] == spte) {
447 rmap_desc_remove_entry(rmapp,
459 static void rmap_write_protect(struct kvm *kvm, u64 gfn)
461 struct kvm_rmap_desc *desc;
462 unsigned long *rmapp;
465 gfn = unalias_gfn(kvm, gfn);
466 rmapp = gfn_to_rmap(kvm, gfn);
470 spte = (u64 *)*rmapp;
472 desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
473 spte = desc->shadow_ptes[0];
476 BUG_ON(!(*spte & PT_PRESENT_MASK));
477 BUG_ON(!(*spte & PT_WRITABLE_MASK));
478 rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
479 rmap_remove(kvm, spte);
480 set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
481 kvm_flush_remote_tlbs(kvm);
486 static int is_empty_shadow_page(u64 *spt)
491 for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++)
492 if ((*pos & ~PT_SHADOW_IO_MARK) != shadow_trap_nonpresent_pte) {
493 printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__,
501 static void kvm_mmu_free_page(struct kvm *kvm,
502 struct kvm_mmu_page *page_head)
504 ASSERT(is_empty_shadow_page(page_head->spt));
505 list_del(&page_head->link);
506 __free_page(virt_to_page(page_head->spt));
507 __free_page(virt_to_page(page_head->gfns));
509 ++kvm->n_free_mmu_pages;
512 static unsigned kvm_page_table_hashfn(gfn_t gfn)
517 static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
520 struct kvm_mmu_page *page;
522 if (!vcpu->kvm->n_free_mmu_pages)
525 page = mmu_memory_cache_alloc(&vcpu->mmu_page_header_cache,
527 page->spt = mmu_memory_cache_alloc(&vcpu->mmu_page_cache, PAGE_SIZE);
528 page->gfns = mmu_memory_cache_alloc(&vcpu->mmu_page_cache, PAGE_SIZE);
529 set_page_private(virt_to_page(page->spt), (unsigned long)page);
530 list_add(&page->link, &vcpu->kvm->active_mmu_pages);
531 ASSERT(is_empty_shadow_page(page->spt));
532 page->slot_bitmap = 0;
533 page->multimapped = 0;
534 page->parent_pte = parent_pte;
535 --vcpu->kvm->n_free_mmu_pages;
539 static void mmu_page_add_parent_pte(struct kvm_vcpu *vcpu,
540 struct kvm_mmu_page *page, u64 *parent_pte)
542 struct kvm_pte_chain *pte_chain;
543 struct hlist_node *node;
548 if (!page->multimapped) {
549 u64 *old = page->parent_pte;
552 page->parent_pte = parent_pte;
555 page->multimapped = 1;
556 pte_chain = mmu_alloc_pte_chain(vcpu);
557 INIT_HLIST_HEAD(&page->parent_ptes);
558 hlist_add_head(&pte_chain->link, &page->parent_ptes);
559 pte_chain->parent_ptes[0] = old;
561 hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link) {
562 if (pte_chain->parent_ptes[NR_PTE_CHAIN_ENTRIES-1])
564 for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i)
565 if (!pte_chain->parent_ptes[i]) {
566 pte_chain->parent_ptes[i] = parent_pte;
570 pte_chain = mmu_alloc_pte_chain(vcpu);
572 hlist_add_head(&pte_chain->link, &page->parent_ptes);
573 pte_chain->parent_ptes[0] = parent_pte;
576 static void mmu_page_remove_parent_pte(struct kvm_mmu_page *page,
579 struct kvm_pte_chain *pte_chain;
580 struct hlist_node *node;
583 if (!page->multimapped) {
584 BUG_ON(page->parent_pte != parent_pte);
585 page->parent_pte = NULL;
588 hlist_for_each_entry(pte_chain, node, &page->parent_ptes, link)
589 for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) {
590 if (!pte_chain->parent_ptes[i])
592 if (pte_chain->parent_ptes[i] != parent_pte)
594 while (i + 1 < NR_PTE_CHAIN_ENTRIES
595 && pte_chain->parent_ptes[i + 1]) {
596 pte_chain->parent_ptes[i]
597 = pte_chain->parent_ptes[i + 1];
600 pte_chain->parent_ptes[i] = NULL;
602 hlist_del(&pte_chain->link);
603 mmu_free_pte_chain(pte_chain);
604 if (hlist_empty(&page->parent_ptes)) {
605 page->multimapped = 0;
606 page->parent_pte = NULL;
614 static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm,
618 struct hlist_head *bucket;
619 struct kvm_mmu_page *page;
620 struct hlist_node *node;
622 pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn);
623 index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
624 bucket = &kvm->mmu_page_hash[index];
625 hlist_for_each_entry(page, node, bucket, hash_link)
626 if (page->gfn == gfn && !page->role.metaphysical) {
627 pgprintk("%s: found role %x\n",
628 __FUNCTION__, page->role.word);
634 static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
639 unsigned hugepage_access,
642 union kvm_mmu_page_role role;
645 struct hlist_head *bucket;
646 struct kvm_mmu_page *page;
647 struct hlist_node *node;
650 role.glevels = vcpu->mmu.root_level;
652 role.metaphysical = metaphysical;
653 role.hugepage_access = hugepage_access;
654 if (vcpu->mmu.root_level <= PT32_ROOT_LEVEL) {
655 quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));
656 quadrant &= (1 << ((PT32_PT_BITS - PT64_PT_BITS) * level)) - 1;
657 role.quadrant = quadrant;
659 pgprintk("%s: looking gfn %lx role %x\n", __FUNCTION__,
661 index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
662 bucket = &vcpu->kvm->mmu_page_hash[index];
663 hlist_for_each_entry(page, node, bucket, hash_link)
664 if (page->gfn == gfn && page->role.word == role.word) {
665 mmu_page_add_parent_pte(vcpu, page, parent_pte);
666 pgprintk("%s: found\n", __FUNCTION__);
669 page = kvm_mmu_alloc_page(vcpu, parent_pte);
672 pgprintk("%s: adding gfn %lx role %x\n", __FUNCTION__, gfn, role.word);
675 hlist_add_head(&page->hash_link, bucket);
676 vcpu->mmu.prefetch_page(vcpu, page);
678 rmap_write_protect(vcpu->kvm, gfn);
682 static void kvm_mmu_page_unlink_children(struct kvm *kvm,
683 struct kvm_mmu_page *page)
691 if (page->role.level == PT_PAGE_TABLE_LEVEL) {
692 for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
693 if (is_shadow_present_pte(pt[i]))
694 rmap_remove(kvm, &pt[i]);
695 pt[i] = shadow_trap_nonpresent_pte;
697 kvm_flush_remote_tlbs(kvm);
701 for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
704 pt[i] = shadow_trap_nonpresent_pte;
705 if (!is_shadow_present_pte(ent))
707 ent &= PT64_BASE_ADDR_MASK;
708 mmu_page_remove_parent_pte(page_header(ent), &pt[i]);
710 kvm_flush_remote_tlbs(kvm);
713 static void kvm_mmu_put_page(struct kvm_mmu_page *page,
716 mmu_page_remove_parent_pte(page, parent_pte);
719 static void kvm_mmu_reset_last_pte_updated(struct kvm *kvm)
723 for (i = 0; i < KVM_MAX_VCPUS; ++i)
725 kvm->vcpus[i]->last_pte_updated = NULL;
728 static void kvm_mmu_zap_page(struct kvm *kvm,
729 struct kvm_mmu_page *page)
733 while (page->multimapped || page->parent_pte) {
734 if (!page->multimapped)
735 parent_pte = page->parent_pte;
737 struct kvm_pte_chain *chain;
739 chain = container_of(page->parent_ptes.first,
740 struct kvm_pte_chain, link);
741 parent_pte = chain->parent_ptes[0];
744 kvm_mmu_put_page(page, parent_pte);
745 set_shadow_pte(parent_pte, shadow_trap_nonpresent_pte);
747 kvm_mmu_page_unlink_children(kvm, page);
748 if (!page->root_count) {
749 hlist_del(&page->hash_link);
750 kvm_mmu_free_page(kvm, page);
752 list_move(&page->link, &kvm->active_mmu_pages);
753 kvm_mmu_reset_last_pte_updated(kvm);
757 * Changing the number of mmu pages allocated to the vm
758 * Note: if kvm_nr_mmu_pages is too small, you will get dead lock
760 void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages)
763 * If we set the number of mmu pages to be smaller be than the
764 * number of actived pages , we must to free some mmu pages before we
768 if ((kvm->n_alloc_mmu_pages - kvm->n_free_mmu_pages) >
770 int n_used_mmu_pages = kvm->n_alloc_mmu_pages
771 - kvm->n_free_mmu_pages;
773 while (n_used_mmu_pages > kvm_nr_mmu_pages) {
774 struct kvm_mmu_page *page;
776 page = container_of(kvm->active_mmu_pages.prev,
777 struct kvm_mmu_page, link);
778 kvm_mmu_zap_page(kvm, page);
781 kvm->n_free_mmu_pages = 0;
784 kvm->n_free_mmu_pages += kvm_nr_mmu_pages
785 - kvm->n_alloc_mmu_pages;
787 kvm->n_alloc_mmu_pages = kvm_nr_mmu_pages;
790 static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
793 struct hlist_head *bucket;
794 struct kvm_mmu_page *page;
795 struct hlist_node *node, *n;
798 pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn);
800 index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
801 bucket = &kvm->mmu_page_hash[index];
802 hlist_for_each_entry_safe(page, node, n, bucket, hash_link)
803 if (page->gfn == gfn && !page->role.metaphysical) {
804 pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn,
806 kvm_mmu_zap_page(kvm, page);
812 static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)
814 struct kvm_mmu_page *page;
816 while ((page = kvm_mmu_lookup_page(kvm, gfn)) != NULL) {
817 pgprintk("%s: zap %lx %x\n",
818 __FUNCTION__, gfn, page->role.word);
819 kvm_mmu_zap_page(kvm, page);
823 static void page_header_update_slot(struct kvm *kvm, void *pte, gpa_t gpa)
825 int slot = memslot_id(kvm, gfn_to_memslot(kvm, gpa >> PAGE_SHIFT));
826 struct kvm_mmu_page *page_head = page_header(__pa(pte));
828 __set_bit(slot, &page_head->slot_bitmap);
831 hpa_t safe_gpa_to_hpa(struct kvm *kvm, gpa_t gpa)
833 hpa_t hpa = gpa_to_hpa(kvm, gpa);
835 return is_error_hpa(hpa) ? bad_page_address | (gpa & ~PAGE_MASK): hpa;
838 hpa_t gpa_to_hpa(struct kvm *kvm, gpa_t gpa)
842 ASSERT((gpa & HPA_ERR_MASK) == 0);
843 page = gfn_to_page(kvm, gpa >> PAGE_SHIFT);
845 return gpa | HPA_ERR_MASK;
846 return ((hpa_t)page_to_pfn(page) << PAGE_SHIFT)
847 | (gpa & (PAGE_SIZE-1));
850 hpa_t gva_to_hpa(struct kvm_vcpu *vcpu, gva_t gva)
852 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva);
854 if (gpa == UNMAPPED_GVA)
856 return gpa_to_hpa(vcpu->kvm, gpa);
859 struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
861 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva);
863 if (gpa == UNMAPPED_GVA)
865 return pfn_to_page(gpa_to_hpa(vcpu->kvm, gpa) >> PAGE_SHIFT);
868 static void nonpaging_new_cr3(struct kvm_vcpu *vcpu)
872 static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p)
874 int level = PT32E_ROOT_LEVEL;
875 hpa_t table_addr = vcpu->mmu.root_hpa;
878 u32 index = PT64_INDEX(v, level);
882 ASSERT(VALID_PAGE(table_addr));
883 table = __va(table_addr);
887 if (is_shadow_present_pte(pte) && is_writeble_pte(pte))
889 mark_page_dirty(vcpu->kvm, v >> PAGE_SHIFT);
890 page_header_update_slot(vcpu->kvm, table, v);
891 table[index] = p | PT_PRESENT_MASK | PT_WRITABLE_MASK |
893 rmap_add(vcpu, &table[index], v >> PAGE_SHIFT);
897 if (table[index] == shadow_trap_nonpresent_pte) {
898 struct kvm_mmu_page *new_table;
901 pseudo_gfn = (v & PT64_DIR_BASE_ADDR_MASK)
903 new_table = kvm_mmu_get_page(vcpu, pseudo_gfn,
905 1, 3, &table[index]);
907 pgprintk("nonpaging_map: ENOMEM\n");
911 table[index] = __pa(new_table->spt) | PT_PRESENT_MASK
912 | PT_WRITABLE_MASK | PT_USER_MASK;
914 table_addr = table[index] & PT64_BASE_ADDR_MASK;
918 static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu,
919 struct kvm_mmu_page *sp)
923 for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
924 sp->spt[i] = shadow_trap_nonpresent_pte;
927 static void mmu_free_roots(struct kvm_vcpu *vcpu)
930 struct kvm_mmu_page *page;
932 if (!VALID_PAGE(vcpu->mmu.root_hpa))
935 if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) {
936 hpa_t root = vcpu->mmu.root_hpa;
938 page = page_header(root);
940 vcpu->mmu.root_hpa = INVALID_PAGE;
944 for (i = 0; i < 4; ++i) {
945 hpa_t root = vcpu->mmu.pae_root[i];
948 root &= PT64_BASE_ADDR_MASK;
949 page = page_header(root);
952 vcpu->mmu.pae_root[i] = INVALID_PAGE;
954 vcpu->mmu.root_hpa = INVALID_PAGE;
957 static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
961 struct kvm_mmu_page *page;
963 root_gfn = vcpu->cr3 >> PAGE_SHIFT;
966 if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) {
967 hpa_t root = vcpu->mmu.root_hpa;
969 ASSERT(!VALID_PAGE(root));
970 page = kvm_mmu_get_page(vcpu, root_gfn, 0,
971 PT64_ROOT_LEVEL, 0, 0, NULL);
972 root = __pa(page->spt);
974 vcpu->mmu.root_hpa = root;
978 for (i = 0; i < 4; ++i) {
979 hpa_t root = vcpu->mmu.pae_root[i];
981 ASSERT(!VALID_PAGE(root));
982 if (vcpu->mmu.root_level == PT32E_ROOT_LEVEL) {
983 if (!is_present_pte(vcpu->pdptrs[i])) {
984 vcpu->mmu.pae_root[i] = 0;
987 root_gfn = vcpu->pdptrs[i] >> PAGE_SHIFT;
988 } else if (vcpu->mmu.root_level == 0)
990 page = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
991 PT32_ROOT_LEVEL, !is_paging(vcpu),
993 root = __pa(page->spt);
995 vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK;
997 vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root);
1000 static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr)
1005 static int nonpaging_page_fault(struct kvm_vcpu *vcpu, gva_t gva,
1012 r = mmu_topup_memory_caches(vcpu);
1017 ASSERT(VALID_PAGE(vcpu->mmu.root_hpa));
1020 paddr = gpa_to_hpa(vcpu->kvm, addr & PT64_BASE_ADDR_MASK);
1022 if (is_error_hpa(paddr))
1025 return nonpaging_map(vcpu, addr & PAGE_MASK, paddr);
1028 static void nonpaging_free(struct kvm_vcpu *vcpu)
1030 mmu_free_roots(vcpu);
1033 static int nonpaging_init_context(struct kvm_vcpu *vcpu)
1035 struct kvm_mmu *context = &vcpu->mmu;
1037 context->new_cr3 = nonpaging_new_cr3;
1038 context->page_fault = nonpaging_page_fault;
1039 context->gva_to_gpa = nonpaging_gva_to_gpa;
1040 context->free = nonpaging_free;
1041 context->prefetch_page = nonpaging_prefetch_page;
1042 context->root_level = 0;
1043 context->shadow_root_level = PT32E_ROOT_LEVEL;
1044 context->root_hpa = INVALID_PAGE;
1048 static void kvm_mmu_flush_tlb(struct kvm_vcpu *vcpu)
1050 ++vcpu->stat.tlb_flush;
1051 kvm_x86_ops->tlb_flush(vcpu);
1054 static void paging_new_cr3(struct kvm_vcpu *vcpu)
1056 pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3);
1057 mmu_free_roots(vcpu);
1060 static void inject_page_fault(struct kvm_vcpu *vcpu,
1064 kvm_x86_ops->inject_page_fault(vcpu, addr, err_code);
1067 static void paging_free(struct kvm_vcpu *vcpu)
1069 nonpaging_free(vcpu);
1073 #include "paging_tmpl.h"
1077 #include "paging_tmpl.h"
1080 static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
1082 struct kvm_mmu *context = &vcpu->mmu;
1084 ASSERT(is_pae(vcpu));
1085 context->new_cr3 = paging_new_cr3;
1086 context->page_fault = paging64_page_fault;
1087 context->gva_to_gpa = paging64_gva_to_gpa;
1088 context->prefetch_page = paging64_prefetch_page;
1089 context->free = paging_free;
1090 context->root_level = level;
1091 context->shadow_root_level = level;
1092 context->root_hpa = INVALID_PAGE;
1096 static int paging64_init_context(struct kvm_vcpu *vcpu)
1098 return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL);
1101 static int paging32_init_context(struct kvm_vcpu *vcpu)
1103 struct kvm_mmu *context = &vcpu->mmu;
1105 context->new_cr3 = paging_new_cr3;
1106 context->page_fault = paging32_page_fault;
1107 context->gva_to_gpa = paging32_gva_to_gpa;
1108 context->free = paging_free;
1109 context->prefetch_page = paging32_prefetch_page;
1110 context->root_level = PT32_ROOT_LEVEL;
1111 context->shadow_root_level = PT32E_ROOT_LEVEL;
1112 context->root_hpa = INVALID_PAGE;
1116 static int paging32E_init_context(struct kvm_vcpu *vcpu)
1118 return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL);
1121 static int init_kvm_mmu(struct kvm_vcpu *vcpu)
1124 ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa));
1126 if (!is_paging(vcpu))
1127 return nonpaging_init_context(vcpu);
1128 else if (is_long_mode(vcpu))
1129 return paging64_init_context(vcpu);
1130 else if (is_pae(vcpu))
1131 return paging32E_init_context(vcpu);
1133 return paging32_init_context(vcpu);
1136 static void destroy_kvm_mmu(struct kvm_vcpu *vcpu)
1139 if (VALID_PAGE(vcpu->mmu.root_hpa)) {
1140 vcpu->mmu.free(vcpu);
1141 vcpu->mmu.root_hpa = INVALID_PAGE;
1145 int kvm_mmu_reset_context(struct kvm_vcpu *vcpu)
1147 destroy_kvm_mmu(vcpu);
1148 return init_kvm_mmu(vcpu);
1150 EXPORT_SYMBOL_GPL(kvm_mmu_reset_context);
1152 int kvm_mmu_load(struct kvm_vcpu *vcpu)
1156 mutex_lock(&vcpu->kvm->lock);
1157 r = mmu_topup_memory_caches(vcpu);
1160 mmu_alloc_roots(vcpu);
1161 kvm_x86_ops->set_cr3(vcpu, vcpu->mmu.root_hpa);
1162 kvm_mmu_flush_tlb(vcpu);
1164 mutex_unlock(&vcpu->kvm->lock);
1167 EXPORT_SYMBOL_GPL(kvm_mmu_load);
1169 void kvm_mmu_unload(struct kvm_vcpu *vcpu)
1171 mmu_free_roots(vcpu);
1174 static void mmu_pte_write_zap_pte(struct kvm_vcpu *vcpu,
1175 struct kvm_mmu_page *page,
1179 struct kvm_mmu_page *child;
1182 if (is_shadow_present_pte(pte)) {
1183 if (page->role.level == PT_PAGE_TABLE_LEVEL)
1184 rmap_remove(vcpu->kvm, spte);
1186 child = page_header(pte & PT64_BASE_ADDR_MASK);
1187 mmu_page_remove_parent_pte(child, spte);
1190 set_shadow_pte(spte, shadow_trap_nonpresent_pte);
1191 kvm_flush_remote_tlbs(vcpu->kvm);
1194 static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
1195 struct kvm_mmu_page *page,
1197 const void *new, int bytes,
1200 if (page->role.level != PT_PAGE_TABLE_LEVEL)
1203 if (page->role.glevels == PT32_ROOT_LEVEL)
1204 paging32_update_pte(vcpu, page, spte, new, bytes,
1207 paging64_update_pte(vcpu, page, spte, new, bytes,
1211 static bool last_updated_pte_accessed(struct kvm_vcpu *vcpu)
1213 u64 *spte = vcpu->last_pte_updated;
1215 return !!(spte && (*spte & PT_ACCESSED_MASK));
1218 void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
1219 const u8 *new, int bytes)
1221 gfn_t gfn = gpa >> PAGE_SHIFT;
1222 struct kvm_mmu_page *page;
1223 struct hlist_node *node, *n;
1224 struct hlist_head *bucket;
1227 unsigned offset = offset_in_page(gpa);
1229 unsigned page_offset;
1230 unsigned misaligned;
1236 pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes);
1237 kvm_mmu_audit(vcpu, "pre pte write");
1238 if (gfn == vcpu->last_pt_write_gfn
1239 && !last_updated_pte_accessed(vcpu)) {
1240 ++vcpu->last_pt_write_count;
1241 if (vcpu->last_pt_write_count >= 3)
1244 vcpu->last_pt_write_gfn = gfn;
1245 vcpu->last_pt_write_count = 1;
1246 vcpu->last_pte_updated = NULL;
1248 index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
1249 bucket = &vcpu->kvm->mmu_page_hash[index];
1250 hlist_for_each_entry_safe(page, node, n, bucket, hash_link) {
1251 if (page->gfn != gfn || page->role.metaphysical)
1253 pte_size = page->role.glevels == PT32_ROOT_LEVEL ? 4 : 8;
1254 misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1);
1255 misaligned |= bytes < 4;
1256 if (misaligned || flooded) {
1258 * Misaligned accesses are too much trouble to fix
1259 * up; also, they usually indicate a page is not used
1262 * If we're seeing too many writes to a page,
1263 * it may no longer be a page table, or we may be
1264 * forking, in which case it is better to unmap the
1267 pgprintk("misaligned: gpa %llx bytes %d role %x\n",
1268 gpa, bytes, page->role.word);
1269 kvm_mmu_zap_page(vcpu->kvm, page);
1272 page_offset = offset;
1273 level = page->role.level;
1275 if (page->role.glevels == PT32_ROOT_LEVEL) {
1276 page_offset <<= 1; /* 32->64 */
1278 * A 32-bit pde maps 4MB while the shadow pdes map
1279 * only 2MB. So we need to double the offset again
1280 * and zap two pdes instead of one.
1282 if (level == PT32_ROOT_LEVEL) {
1283 page_offset &= ~7; /* kill rounding error */
1287 quadrant = page_offset >> PAGE_SHIFT;
1288 page_offset &= ~PAGE_MASK;
1289 if (quadrant != page->role.quadrant)
1292 spte = &page->spt[page_offset / sizeof(*spte)];
1294 mmu_pte_write_zap_pte(vcpu, page, spte);
1295 mmu_pte_write_new_pte(vcpu, page, spte, new, bytes,
1296 page_offset & (pte_size - 1));
1300 kvm_mmu_audit(vcpu, "post pte write");
1303 int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
1305 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva);
1307 return kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
1310 void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
1312 while (vcpu->kvm->n_free_mmu_pages < KVM_REFILL_PAGES) {
1313 struct kvm_mmu_page *page;
1315 page = container_of(vcpu->kvm->active_mmu_pages.prev,
1316 struct kvm_mmu_page, link);
1317 kvm_mmu_zap_page(vcpu->kvm, page);
1321 static void free_mmu_pages(struct kvm_vcpu *vcpu)
1323 struct kvm_mmu_page *page;
1325 while (!list_empty(&vcpu->kvm->active_mmu_pages)) {
1326 page = container_of(vcpu->kvm->active_mmu_pages.next,
1327 struct kvm_mmu_page, link);
1328 kvm_mmu_zap_page(vcpu->kvm, page);
1330 free_page((unsigned long)vcpu->mmu.pae_root);
1333 static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
1340 if (vcpu->kvm->n_requested_mmu_pages)
1341 vcpu->kvm->n_free_mmu_pages = vcpu->kvm->n_requested_mmu_pages;
1343 vcpu->kvm->n_free_mmu_pages = vcpu->kvm->n_alloc_mmu_pages;
1345 * When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
1346 * Therefore we need to allocate shadow page tables in the first
1347 * 4GB of memory, which happens to fit the DMA32 zone.
1349 page = alloc_page(GFP_KERNEL | __GFP_DMA32);
1352 vcpu->mmu.pae_root = page_address(page);
1353 for (i = 0; i < 4; ++i)
1354 vcpu->mmu.pae_root[i] = INVALID_PAGE;
1359 free_mmu_pages(vcpu);
1363 int kvm_mmu_create(struct kvm_vcpu *vcpu)
1366 ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa));
1368 return alloc_mmu_pages(vcpu);
1371 int kvm_mmu_setup(struct kvm_vcpu *vcpu)
1374 ASSERT(!VALID_PAGE(vcpu->mmu.root_hpa));
1376 return init_kvm_mmu(vcpu);
1379 void kvm_mmu_destroy(struct kvm_vcpu *vcpu)
1383 destroy_kvm_mmu(vcpu);
1384 free_mmu_pages(vcpu);
1385 mmu_free_memory_caches(vcpu);
1388 void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot)
1390 struct kvm_mmu_page *page;
1392 list_for_each_entry(page, &kvm->active_mmu_pages, link) {
1396 if (!test_bit(slot, &page->slot_bitmap))
1400 for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
1402 if (pt[i] & PT_WRITABLE_MASK) {
1403 rmap_remove(kvm, &pt[i]);
1404 pt[i] &= ~PT_WRITABLE_MASK;
1409 void kvm_mmu_zap_all(struct kvm *kvm)
1411 struct kvm_mmu_page *page, *node;
1413 list_for_each_entry_safe(page, node, &kvm->active_mmu_pages, link)
1414 kvm_mmu_zap_page(kvm, page);
1416 kvm_flush_remote_tlbs(kvm);
1419 void kvm_mmu_module_exit(void)
1421 if (pte_chain_cache)
1422 kmem_cache_destroy(pte_chain_cache);
1423 if (rmap_desc_cache)
1424 kmem_cache_destroy(rmap_desc_cache);
1425 if (mmu_page_header_cache)
1426 kmem_cache_destroy(mmu_page_header_cache);
1429 int kvm_mmu_module_init(void)
1431 pte_chain_cache = kmem_cache_create("kvm_pte_chain",
1432 sizeof(struct kvm_pte_chain),
1434 if (!pte_chain_cache)
1436 rmap_desc_cache = kmem_cache_create("kvm_rmap_desc",
1437 sizeof(struct kvm_rmap_desc),
1439 if (!rmap_desc_cache)
1442 mmu_page_header_cache = kmem_cache_create("kvm_mmu_page_header",
1443 sizeof(struct kvm_mmu_page),
1445 if (!mmu_page_header_cache)
1451 kvm_mmu_module_exit();
1457 static const char *audit_msg;
1459 static gva_t canonicalize(gva_t gva)
1461 #ifdef CONFIG_X86_64
1462 gva = (long long)(gva << 16) >> 16;
1467 static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
1468 gva_t va, int level)
1470 u64 *pt = __va(page_pte & PT64_BASE_ADDR_MASK);
1472 gva_t va_delta = 1ul << (PAGE_SHIFT + 9 * (level - 1));
1474 for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) {
1477 if (ent == shadow_trap_nonpresent_pte)
1480 va = canonicalize(va);
1482 if (ent == shadow_notrap_nonpresent_pte)
1483 printk(KERN_ERR "audit: (%s) nontrapping pte"
1484 " in nonleaf level: levels %d gva %lx"
1485 " level %d pte %llx\n", audit_msg,
1486 vcpu->mmu.root_level, va, level, ent);
1488 audit_mappings_page(vcpu, ent, va, level - 1);
1490 gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, va);
1491 hpa_t hpa = gpa_to_hpa(vcpu, gpa);
1493 if (is_shadow_present_pte(ent)
1494 && (ent & PT64_BASE_ADDR_MASK) != hpa)
1495 printk(KERN_ERR "xx audit error: (%s) levels %d"
1496 " gva %lx gpa %llx hpa %llx ent %llx %d\n",
1497 audit_msg, vcpu->mmu.root_level,
1499 is_shadow_present_pte(ent));
1500 else if (ent == shadow_notrap_nonpresent_pte
1501 && !is_error_hpa(hpa))
1502 printk(KERN_ERR "audit: (%s) notrap shadow,"
1503 " valid guest gva %lx\n", audit_msg, va);
1509 static void audit_mappings(struct kvm_vcpu *vcpu)
1513 if (vcpu->mmu.root_level == 4)
1514 audit_mappings_page(vcpu, vcpu->mmu.root_hpa, 0, 4);
1516 for (i = 0; i < 4; ++i)
1517 if (vcpu->mmu.pae_root[i] & PT_PRESENT_MASK)
1518 audit_mappings_page(vcpu,
1519 vcpu->mmu.pae_root[i],
1524 static int count_rmaps(struct kvm_vcpu *vcpu)
1529 for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
1530 struct kvm_memory_slot *m = &vcpu->kvm->memslots[i];
1531 struct kvm_rmap_desc *d;
1533 for (j = 0; j < m->npages; ++j) {
1534 unsigned long *rmapp = &m->rmap[j];
1538 if (!(*rmapp & 1)) {
1542 d = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
1544 for (k = 0; k < RMAP_EXT; ++k)
1545 if (d->shadow_ptes[k])
1556 static int count_writable_mappings(struct kvm_vcpu *vcpu)
1559 struct kvm_mmu_page *page;
1562 list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) {
1563 u64 *pt = page->spt;
1565 if (page->role.level != PT_PAGE_TABLE_LEVEL)
1568 for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
1571 if (!(ent & PT_PRESENT_MASK))
1573 if (!(ent & PT_WRITABLE_MASK))
1581 static void audit_rmap(struct kvm_vcpu *vcpu)
1583 int n_rmap = count_rmaps(vcpu);
1584 int n_actual = count_writable_mappings(vcpu);
1586 if (n_rmap != n_actual)
1587 printk(KERN_ERR "%s: (%s) rmap %d actual %d\n",
1588 __FUNCTION__, audit_msg, n_rmap, n_actual);
1591 static void audit_write_protection(struct kvm_vcpu *vcpu)
1593 struct kvm_mmu_page *page;
1594 struct kvm_memory_slot *slot;
1595 unsigned long *rmapp;
1598 list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) {
1599 if (page->role.metaphysical)
1602 slot = gfn_to_memslot(vcpu->kvm, page->gfn);
1603 gfn = unalias_gfn(vcpu->kvm, page->gfn);
1604 rmapp = &slot->rmap[gfn - slot->base_gfn];
1606 printk(KERN_ERR "%s: (%s) shadow page has writable"
1607 " mappings: gfn %lx role %x\n",
1608 __FUNCTION__, audit_msg, page->gfn,
1613 static void kvm_mmu_audit(struct kvm_vcpu *vcpu, const char *msg)
1620 audit_write_protection(vcpu);
1621 audit_mappings(vcpu);