#define PT32_DIR_PSE36_SIZE 4
#define PT32_DIR_PSE36_SHIFT 13
-#define PT32_DIR_PSE36_MASK (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
+#define PT32_DIR_PSE36_MASK \
+ (((1ULL << PT32_DIR_PSE36_SIZE) - 1) << PT32_DIR_PSE36_SHIFT)
#define PT_FIRST_AVAIL_BITS_SHIFT 9
#define PT64_LEVEL_BITS 9
#define PT64_LEVEL_SHIFT(level) \
- ( PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS )
+ (PAGE_SHIFT + (level - 1) * PT64_LEVEL_BITS)
#define PT64_LEVEL_MASK(level) \
(((1ULL << PT64_LEVEL_BITS) - 1) << PT64_LEVEL_SHIFT(level))
#define PT32_LEVEL_BITS 10
#define PT32_LEVEL_SHIFT(level) \
- ( PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS )
+ (PAGE_SHIFT + (level - 1) * PT32_LEVEL_BITS)
#define PT32_LEVEL_MASK(level) \
(((1ULL << PT32_LEVEL_BITS) - 1) << PT32_LEVEL_SHIFT(level))
static struct kmem_cache *rmap_desc_cache;
static struct kmem_cache *mmu_page_header_cache;
+static u64 __read_mostly shadow_trap_nonpresent_pte;
+static u64 __read_mostly shadow_notrap_nonpresent_pte;
+
+void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte)
+{
+ shadow_trap_nonpresent_pte = trap_pte;
+ shadow_notrap_nonpresent_pte = notrap_pte;
+}
+EXPORT_SYMBOL_GPL(kvm_mmu_set_nonpresent_ptes);
+
static int is_write_protection(struct kvm_vcpu *vcpu)
{
return vcpu->cr0 & X86_CR0_WP;
return pte & PT_PRESENT_MASK;
}
+static int is_shadow_present_pte(u64 pte)
+{
+ pte &= ~PT_SHADOW_IO_MARK;
+ return pte != shadow_trap_nonpresent_pte
+ && pte != shadow_notrap_nonpresent_pte;
+}
+
static int is_writeble_pte(unsigned long pte)
{
return pte & PT_WRITABLE_MASK;
rmap_desc_cache, 1);
if (r)
goto out;
- r = mmu_topup_memory_cache_page(&vcpu->mmu_page_cache, 4);
+ r = mmu_topup_memory_cache_page(&vcpu->mmu_page_cache, 8);
if (r)
goto out;
r = mmu_topup_memory_cache(&vcpu->mmu_page_header_cache,
kfree(rd);
}
+/*
+ * Take gfn and return the reverse mapping to it.
+ * Note: gfn must be unaliased before this function get called
+ */
+
+static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn)
+{
+ struct kvm_memory_slot *slot;
+
+ slot = gfn_to_memslot(kvm, gfn);
+ return &slot->rmap[gfn - slot->base_gfn];
+}
+
/*
* Reverse mapping data structures:
*
- * If page->private bit zero is zero, then page->private points to the
- * shadow page table entry that points to page_address(page).
+ * If rmapp bit zero is zero, then rmapp point to the shadw page table entry
+ * that points to page_address(page).
*
- * If page->private bit zero is one, (then page->private & ~1) points
- * to a struct kvm_rmap_desc containing more mappings.
+ * If rmapp bit zero is one, (then rmap & ~1) points to a struct kvm_rmap_desc
+ * containing more mappings.
*/
-static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte)
+static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
{
- struct page *page;
+ struct kvm_mmu_page *page;
struct kvm_rmap_desc *desc;
+ unsigned long *rmapp;
int i;
if (!is_rmap_pte(*spte))
return;
- page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT);
- if (!page_private(page)) {
+ gfn = unalias_gfn(vcpu->kvm, gfn);
+ page = page_header(__pa(spte));
+ page->gfns[spte - page->spt] = gfn;
+ rmapp = gfn_to_rmap(vcpu->kvm, gfn);
+ if (!*rmapp) {
rmap_printk("rmap_add: %p %llx 0->1\n", spte, *spte);
- set_page_private(page,(unsigned long)spte);
- } else if (!(page_private(page) & 1)) {
+ *rmapp = (unsigned long)spte;
+ } else if (!(*rmapp & 1)) {
rmap_printk("rmap_add: %p %llx 1->many\n", spte, *spte);
desc = mmu_alloc_rmap_desc(vcpu);
- desc->shadow_ptes[0] = (u64 *)page_private(page);
+ desc->shadow_ptes[0] = (u64 *)*rmapp;
desc->shadow_ptes[1] = spte;
- set_page_private(page,(unsigned long)desc | 1);
+ *rmapp = (unsigned long)desc | 1;
} else {
rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte);
- desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul);
+ desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
while (desc->shadow_ptes[RMAP_EXT-1] && desc->more)
desc = desc->more;
if (desc->shadow_ptes[RMAP_EXT-1]) {
}
}
-static void rmap_desc_remove_entry(struct page *page,
+static void rmap_desc_remove_entry(unsigned long *rmapp,
struct kvm_rmap_desc *desc,
int i,
struct kvm_rmap_desc *prev_desc)
if (j != 0)
return;
if (!prev_desc && !desc->more)
- set_page_private(page,(unsigned long)desc->shadow_ptes[0]);
+ *rmapp = (unsigned long)desc->shadow_ptes[0];
else
if (prev_desc)
prev_desc->more = desc->more;
else
- set_page_private(page,(unsigned long)desc->more | 1);
+ *rmapp = (unsigned long)desc->more | 1;
mmu_free_rmap_desc(desc);
}
-static void rmap_remove(u64 *spte)
+static void rmap_remove(struct kvm *kvm, u64 *spte)
{
- struct page *page;
struct kvm_rmap_desc *desc;
struct kvm_rmap_desc *prev_desc;
+ struct kvm_mmu_page *page;
+ unsigned long *rmapp;
int i;
if (!is_rmap_pte(*spte))
return;
- page = pfn_to_page((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT);
- if (!page_private(page)) {
+ page = page_header(__pa(spte));
+ rmapp = gfn_to_rmap(kvm, page->gfns[spte - page->spt]);
+ if (!*rmapp) {
printk(KERN_ERR "rmap_remove: %p %llx 0->BUG\n", spte, *spte);
BUG();
- } else if (!(page_private(page) & 1)) {
+ } else if (!(*rmapp & 1)) {
rmap_printk("rmap_remove: %p %llx 1->0\n", spte, *spte);
- if ((u64 *)page_private(page) != spte) {
+ if ((u64 *)*rmapp != spte) {
printk(KERN_ERR "rmap_remove: %p %llx 1->BUG\n",
spte, *spte);
BUG();
}
- set_page_private(page,0);
+ *rmapp = 0;
} else {
rmap_printk("rmap_remove: %p %llx many->many\n", spte, *spte);
- desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul);
+ desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
prev_desc = NULL;
while (desc) {
for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i)
if (desc->shadow_ptes[i] == spte) {
- rmap_desc_remove_entry(page,
+ rmap_desc_remove_entry(rmapp,
desc, i,
prev_desc);
return;
static void rmap_write_protect(struct kvm_vcpu *vcpu, u64 gfn)
{
- struct kvm *kvm = vcpu->kvm;
- struct page *page;
struct kvm_rmap_desc *desc;
+ unsigned long *rmapp;
u64 *spte;
- page = gfn_to_page(kvm, gfn);
- BUG_ON(!page);
+ gfn = unalias_gfn(vcpu->kvm, gfn);
+ rmapp = gfn_to_rmap(vcpu->kvm, gfn);
- while (page_private(page)) {
- if (!(page_private(page) & 1))
- spte = (u64 *)page_private(page);
+ while (*rmapp) {
+ if (!(*rmapp & 1))
+ spte = (u64 *)*rmapp;
else {
- desc = (struct kvm_rmap_desc *)(page_private(page) & ~1ul);
+ desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
spte = desc->shadow_ptes[0];
}
BUG_ON(!spte);
- BUG_ON((*spte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT
- != page_to_pfn(page));
BUG_ON(!(*spte & PT_PRESENT_MASK));
BUG_ON(!(*spte & PT_WRITABLE_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
- rmap_remove(spte);
+ rmap_remove(vcpu->kvm, spte);
set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
kvm_flush_remote_tlbs(vcpu->kvm);
}
u64 *end;
for (pos = spt, end = pos + PAGE_SIZE / sizeof(u64); pos != end; pos++)
- if (*pos != 0) {
+ if ((*pos & ~PT_SHADOW_IO_MARK) != shadow_trap_nonpresent_pte) {
printk(KERN_ERR "%s: %p %llx\n", __FUNCTION__,
pos, *pos);
return 0;
ASSERT(is_empty_shadow_page(page_head->spt));
list_del(&page_head->link);
__free_page(virt_to_page(page_head->spt));
+ __free_page(virt_to_page(page_head->gfns));
kfree(page_head);
++kvm->n_free_mmu_pages;
}
page = mmu_memory_cache_alloc(&vcpu->mmu_page_header_cache,
sizeof *page);
page->spt = mmu_memory_cache_alloc(&vcpu->mmu_page_cache, PAGE_SIZE);
+ page->gfns = mmu_memory_cache_alloc(&vcpu->mmu_page_cache, PAGE_SIZE);
set_page_private(virt_to_page(page->spt), (unsigned long)page);
list_add(&page->link, &vcpu->kvm->active_mmu_pages);
ASSERT(is_empty_shadow_page(page->spt));
BUG();
}
-static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm_vcpu *vcpu,
+static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm,
gfn_t gfn)
{
unsigned index;
pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn);
index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
- bucket = &vcpu->kvm->mmu_page_hash[index];
+ bucket = &kvm->mmu_page_hash[index];
hlist_for_each_entry(page, node, bucket, hash_link)
if (page->gfn == gfn && !page->role.metaphysical) {
pgprintk("%s: found role %x\n",
page->gfn = gfn;
page->role = role;
hlist_add_head(&page->hash_link, bucket);
+ vcpu->mmu.prefetch_page(vcpu, page);
if (!metaphysical)
rmap_write_protect(vcpu, gfn);
return page;
if (page->role.level == PT_PAGE_TABLE_LEVEL) {
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
- if (pt[i] & PT_PRESENT_MASK)
- rmap_remove(&pt[i]);
- pt[i] = 0;
+ if (is_shadow_present_pte(pt[i]))
+ rmap_remove(kvm, &pt[i]);
+ pt[i] = shadow_trap_nonpresent_pte;
}
kvm_flush_remote_tlbs(kvm);
return;
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
ent = pt[i];
- pt[i] = 0;
- if (!(ent & PT_PRESENT_MASK))
+ pt[i] = shadow_trap_nonpresent_pte;
+ if (!is_shadow_present_pte(ent))
continue;
ent &= PT64_BASE_ADDR_MASK;
mmu_page_remove_parent_pte(page_header(ent), &pt[i]);
mmu_page_remove_parent_pte(page, parent_pte);
}
+static void kvm_mmu_reset_last_pte_updated(struct kvm *kvm)
+{
+ int i;
+
+ for (i = 0; i < KVM_MAX_VCPUS; ++i)
+ if (kvm->vcpus[i])
+ kvm->vcpus[i]->last_pte_updated = NULL;
+}
+
static void kvm_mmu_zap_page(struct kvm *kvm,
struct kvm_mmu_page *page)
{
}
BUG_ON(!parent_pte);
kvm_mmu_put_page(page, parent_pte);
- set_shadow_pte(parent_pte, 0);
+ set_shadow_pte(parent_pte, shadow_trap_nonpresent_pte);
}
kvm_mmu_page_unlink_children(kvm, page);
if (!page->root_count) {
kvm_mmu_free_page(kvm, page);
} else
list_move(&page->link, &kvm->active_mmu_pages);
+ kvm_mmu_reset_last_pte_updated(kvm);
+}
+
+/*
+ * Changing the number of mmu pages allocated to the vm
+ * Note: if kvm_nr_mmu_pages is too small, you will get dead lock
+ */
+void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages)
+{
+ /*
+ * If we set the number of mmu pages to be smaller be than the
+ * number of actived pages , we must to free some mmu pages before we
+ * change the value
+ */
+
+ if ((kvm->n_alloc_mmu_pages - kvm->n_free_mmu_pages) >
+ kvm_nr_mmu_pages) {
+ int n_used_mmu_pages = kvm->n_alloc_mmu_pages
+ - kvm->n_free_mmu_pages;
+
+ while (n_used_mmu_pages > kvm_nr_mmu_pages) {
+ struct kvm_mmu_page *page;
+
+ page = container_of(kvm->active_mmu_pages.prev,
+ struct kvm_mmu_page, link);
+ kvm_mmu_zap_page(kvm, page);
+ n_used_mmu_pages--;
+ }
+ kvm->n_free_mmu_pages = 0;
+ }
+ else
+ kvm->n_free_mmu_pages += kvm_nr_mmu_pages
+ - kvm->n_alloc_mmu_pages;
+
+ kvm->n_alloc_mmu_pages = kvm_nr_mmu_pages;
}
-static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn)
+static int kvm_mmu_unprotect_page(struct kvm *kvm, gfn_t gfn)
{
unsigned index;
struct hlist_head *bucket;
pgprintk("%s: looking for gfn %lx\n", __FUNCTION__, gfn);
r = 0;
index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
- bucket = &vcpu->kvm->mmu_page_hash[index];
+ bucket = &kvm->mmu_page_hash[index];
hlist_for_each_entry_safe(page, node, n, bucket, hash_link)
if (page->gfn == gfn && !page->role.metaphysical) {
pgprintk("%s: gfn %lx role %x\n", __FUNCTION__, gfn,
page->role.word);
- kvm_mmu_zap_page(vcpu->kvm, page);
+ kvm_mmu_zap_page(kvm, page);
r = 1;
}
return r;
}
-static void mmu_unshadow(struct kvm_vcpu *vcpu, gfn_t gfn)
+static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)
{
struct kvm_mmu_page *page;
- while ((page = kvm_mmu_lookup_page(vcpu, gfn)) != NULL) {
+ while ((page = kvm_mmu_lookup_page(kvm, gfn)) != NULL) {
pgprintk("%s: zap %lx %x\n",
__FUNCTION__, gfn, page->role.word);
- kvm_mmu_zap_page(vcpu->kvm, page);
+ kvm_mmu_zap_page(kvm, page);
}
}
if (level == 1) {
pte = table[index];
- if (is_present_pte(pte) && is_writeble_pte(pte))
+ if (is_shadow_present_pte(pte) && is_writeble_pte(pte))
return 0;
mark_page_dirty(vcpu->kvm, v >> PAGE_SHIFT);
page_header_update_slot(vcpu->kvm, table, v);
table[index] = p | PT_PRESENT_MASK | PT_WRITABLE_MASK |
PT_USER_MASK;
- rmap_add(vcpu, &table[index]);
+ rmap_add(vcpu, &table[index], v >> PAGE_SHIFT);
return 0;
}
- if (table[index] == 0) {
+ if (table[index] == shadow_trap_nonpresent_pte) {
struct kvm_mmu_page *new_table;
gfn_t pseudo_gfn;
}
}
+static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *sp)
+{
+ int i;
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
+ sp->spt[i] = shadow_trap_nonpresent_pte;
+}
+
static void mmu_free_roots(struct kvm_vcpu *vcpu)
{
int i;
context->page_fault = nonpaging_page_fault;
context->gva_to_gpa = nonpaging_gva_to_gpa;
context->free = nonpaging_free;
+ context->prefetch_page = nonpaging_prefetch_page;
context->root_level = 0;
context->shadow_root_level = PT32E_ROOT_LEVEL;
context->root_hpa = INVALID_PAGE;
context->new_cr3 = paging_new_cr3;
context->page_fault = paging64_page_fault;
context->gva_to_gpa = paging64_gva_to_gpa;
+ context->prefetch_page = paging64_prefetch_page;
context->free = paging_free;
context->root_level = level;
context->shadow_root_level = level;
context->page_fault = paging32_page_fault;
context->gva_to_gpa = paging32_gva_to_gpa;
context->free = paging_free;
+ context->prefetch_page = paging32_prefetch_page;
context->root_level = PT32_ROOT_LEVEL;
context->shadow_root_level = PT32E_ROOT_LEVEL;
context->root_hpa = INVALID_PAGE;
destroy_kvm_mmu(vcpu);
return init_kvm_mmu(vcpu);
}
+EXPORT_SYMBOL_GPL(kvm_mmu_reset_context);
int kvm_mmu_load(struct kvm_vcpu *vcpu)
{
struct kvm_mmu_page *child;
pte = *spte;
- if (is_present_pte(pte)) {
+ if (is_shadow_present_pte(pte)) {
if (page->role.level == PT_PAGE_TABLE_LEVEL)
- rmap_remove(spte);
+ rmap_remove(vcpu->kvm, spte);
else {
child = page_header(pte & PT64_BASE_ADDR_MASK);
mmu_page_remove_parent_pte(child, spte);
}
}
- *spte = 0;
+ set_shadow_pte(spte, shadow_trap_nonpresent_pte);
kvm_flush_remote_tlbs(vcpu->kvm);
}
static void mmu_pte_write_new_pte(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *page,
u64 *spte,
- const void *new, int bytes)
+ const void *new, int bytes,
+ int offset_in_pte)
{
if (page->role.level != PT_PAGE_TABLE_LEVEL)
return;
if (page->role.glevels == PT32_ROOT_LEVEL)
- paging32_update_pte(vcpu, page, spte, new, bytes);
+ paging32_update_pte(vcpu, page, spte, new, bytes,
+ offset_in_pte);
else
- paging64_update_pte(vcpu, page, spte, new, bytes);
+ paging64_update_pte(vcpu, page, spte, new, bytes,
+ offset_in_pte);
+}
+
+static bool last_updated_pte_accessed(struct kvm_vcpu *vcpu)
+{
+ u64 *spte = vcpu->last_pte_updated;
+
+ return !!(spte && (*spte & PT_ACCESSED_MASK));
}
void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
int npte;
pgprintk("%s: gpa %llx bytes %d\n", __FUNCTION__, gpa, bytes);
- if (gfn == vcpu->last_pt_write_gfn) {
+ kvm_mmu_audit(vcpu, "pre pte write");
+ if (gfn == vcpu->last_pt_write_gfn
+ && !last_updated_pte_accessed(vcpu)) {
++vcpu->last_pt_write_count;
if (vcpu->last_pt_write_count >= 3)
flooded = 1;
} else {
vcpu->last_pt_write_gfn = gfn;
vcpu->last_pt_write_count = 1;
+ vcpu->last_pte_updated = NULL;
}
index = kvm_page_table_hashfn(gfn) % KVM_NUM_MMU_PAGES;
bucket = &vcpu->kvm->mmu_page_hash[index];
spte = &page->spt[page_offset / sizeof(*spte)];
while (npte--) {
mmu_pte_write_zap_pte(vcpu, page, spte);
- mmu_pte_write_new_pte(vcpu, page, spte, new, bytes);
+ mmu_pte_write_new_pte(vcpu, page, spte, new, bytes,
+ page_offset & (pte_size - 1));
++spte;
}
}
+ kvm_mmu_audit(vcpu, "post pte write");
}
int kvm_mmu_unprotect_page_virt(struct kvm_vcpu *vcpu, gva_t gva)
{
gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, gva);
- return kvm_mmu_unprotect_page(vcpu, gpa >> PAGE_SHIFT);
+ return kvm_mmu_unprotect_page(vcpu->kvm, gpa >> PAGE_SHIFT);
}
void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
ASSERT(vcpu);
- vcpu->kvm->n_free_mmu_pages = KVM_NUM_MMU_PAGES;
-
+ if (vcpu->kvm->n_requested_mmu_pages)
+ vcpu->kvm->n_free_mmu_pages = vcpu->kvm->n_requested_mmu_pages;
+ else
+ vcpu->kvm->n_free_mmu_pages = vcpu->kvm->n_alloc_mmu_pages;
/*
* When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
* Therefore we need to allocate shadow page tables in the first
for (i = 0; i < PT64_ENT_PER_PAGE; ++i)
/* avoid RMW */
if (pt[i] & PT_WRITABLE_MASK) {
- rmap_remove(&pt[i]);
+ rmap_remove(kvm, &pt[i]);
pt[i] &= ~PT_WRITABLE_MASK;
}
}
for (i = 0; i < PT64_ENT_PER_PAGE; ++i, va += va_delta) {
u64 ent = pt[i];
- if (!(ent & PT_PRESENT_MASK))
+ if (ent == shadow_trap_nonpresent_pte)
continue;
va = canonicalize(va);
- if (level > 1)
+ if (level > 1) {
+ if (ent == shadow_notrap_nonpresent_pte)
+ printk(KERN_ERR "audit: (%s) nontrapping pte"
+ " in nonleaf level: levels %d gva %lx"
+ " level %d pte %llx\n", audit_msg,
+ vcpu->mmu.root_level, va, level, ent);
+
audit_mappings_page(vcpu, ent, va, level - 1);
- else {
+ } else {
gpa_t gpa = vcpu->mmu.gva_to_gpa(vcpu, va);
hpa_t hpa = gpa_to_hpa(vcpu, gpa);
- if ((ent & PT_PRESENT_MASK)
+ if (is_shadow_present_pte(ent)
&& (ent & PT64_BASE_ADDR_MASK) != hpa)
- printk(KERN_ERR "audit error: (%s) levels %d"
- " gva %lx gpa %llx hpa %llx ent %llx\n",
+ printk(KERN_ERR "xx audit error: (%s) levels %d"
+ " gva %lx gpa %llx hpa %llx ent %llx %d\n",
audit_msg, vcpu->mmu.root_level,
- va, gpa, hpa, ent);
+ va, gpa, hpa, ent,
+ is_shadow_present_pte(ent));
+ else if (ent == shadow_notrap_nonpresent_pte
+ && !is_error_hpa(hpa))
+ printk(KERN_ERR "audit: (%s) notrap shadow,"
+ " valid guest gva %lx\n", audit_msg, va);
+
}
}
}
struct kvm_rmap_desc *d;
for (j = 0; j < m->npages; ++j) {
- struct page *page = m->phys_mem[j];
+ unsigned long *rmapp = &m->rmap[j];
- if (!page->private)
+ if (!*rmapp)
continue;
- if (!(page->private & 1)) {
+ if (!(*rmapp & 1)) {
++nmaps;
continue;
}
- d = (struct kvm_rmap_desc *)(page->private & ~1ul);
+ d = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
while (d) {
for (k = 0; k < RMAP_EXT; ++k)
if (d->shadow_ptes[k])
static void audit_write_protection(struct kvm_vcpu *vcpu)
{
struct kvm_mmu_page *page;
+ struct kvm_memory_slot *slot;
+ unsigned long *rmapp;
+ gfn_t gfn;
list_for_each_entry(page, &vcpu->kvm->active_mmu_pages, link) {
- hfn_t hfn;
- struct page *pg;
-
if (page->role.metaphysical)
continue;
- hfn = gpa_to_hpa(vcpu, (gpa_t)page->gfn << PAGE_SHIFT)
- >> PAGE_SHIFT;
- pg = pfn_to_page(hfn);
- if (pg->private)
+ slot = gfn_to_memslot(vcpu->kvm, page->gfn);
+ gfn = unalias_gfn(vcpu->kvm, page->gfn);
+ rmapp = &slot->rmap[gfn - slot->base_gfn];
+ if (*rmapp)
printk(KERN_ERR "%s: (%s) shadow page has writable"
" mappings: gfn %lx role %x\n",
__FUNCTION__, audit_msg, page->gfn,
projects / cascardo / linux.git / blobdiff