*
*/
-#include "vmx.h"
#include "mmu.h"
+#include "kvm_cache_regs.h"
#include <linux/kvm_host.h>
#include <linux/types.h>
#include <asm/page.h>
#include <asm/cmpxchg.h>
#include <asm/io.h>
+#include <asm/vmx.h>
/*
* When setting this variable to true it enables Two-Dimensional-Paging
module_param(dbg, bool, 0644);
#endif
+static int oos_shadow = 1;
+module_param(oos_shadow, bool, 0644);
+
#ifndef MMU_DEBUG
#define ASSERT(x) do { } while (0)
#else
#define PFERR_PRESENT_MASK (1U << 0)
#define PFERR_WRITE_MASK (1U << 1)
#define PFERR_USER_MASK (1U << 2)
+#define PFERR_RSVD_MASK (1U << 3)
#define PFERR_FETCH_MASK (1U << 4)
#define PT_DIRECTORY_LEVEL 2
#define SHADOW_PT_INDEX(addr, level) PT64_INDEX(addr, level)
struct kvm_rmap_desc {
- u64 *shadow_ptes[RMAP_EXT];
+ u64 *sptes[RMAP_EXT];
struct kvm_rmap_desc *more;
};
-struct kvm_shadow_walk {
- int (*entry)(struct kvm_shadow_walk *walk, struct kvm_vcpu *vcpu,
- u64 addr, u64 *spte, int level);
+struct kvm_shadow_walk_iterator {
+ u64 addr;
+ hpa_t shadow_addr;
+ int level;
+ u64 *sptep;
+ unsigned index;
+};
+
+#define for_each_shadow_entry(_vcpu, _addr, _walker) \
+ for (shadow_walk_init(&(_walker), _vcpu, _addr); \
+ shadow_walk_okay(&(_walker)); \
+ shadow_walk_next(&(_walker)))
+
+
+struct kvm_unsync_walk {
+ int (*entry) (struct kvm_mmu_page *sp, struct kvm_unsync_walk *walk);
};
+typedef int (*mmu_parent_walk_fn) (struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp);
+
static struct kmem_cache *pte_chain_cache;
static struct kmem_cache *rmap_desc_cache;
static struct kmem_cache *mmu_page_header_cache;
static u64 __read_mostly shadow_accessed_mask;
static u64 __read_mostly shadow_dirty_mask;
+static inline u64 rsvd_bits(int s, int e)
+{
+ return ((1ULL << (e - s + 1)) - 1) << s;
+}
+
void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte)
{
shadow_trap_nonpresent_pte = trap_pte;
return vcpu->arch.shadow_efer & EFER_NX;
}
-static int is_present_pte(unsigned long pte)
-{
- return pte & PT_PRESENT_MASK;
-}
-
static int is_shadow_present_pte(u64 pte)
{
return pte != shadow_trap_nonpresent_pte
return pte & PT_WRITABLE_MASK;
}
-static int is_dirty_pte(unsigned long pte)
+static int is_dirty_gpte(unsigned long pte)
{
- return pte & shadow_dirty_mask;
+ return pte & PT_DIRTY_MASK;
}
-static int is_rmap_pte(u64 pte)
+static int is_rmap_spte(u64 pte)
{
return is_shadow_present_pte(pte);
}
+static int is_last_spte(u64 pte, int level)
+{
+ if (level == PT_PAGE_TABLE_LEVEL)
+ return 1;
+ if (level == PT_DIRECTORY_LEVEL && is_large_pte(pte))
+ return 1;
+ return 0;
+}
+
static pfn_t spte_to_pfn(u64 pte)
{
return (pte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
return (gpte & PT32_DIR_PSE36_MASK) << shift;
}
-static void set_shadow_pte(u64 *sptep, u64 spte)
+static void __set_spte(u64 *sptep, u64 spte)
{
#ifdef CONFIG_X86_64
set_64bit((unsigned long *)sptep, spte);
if (r)
goto out;
r = mmu_topup_memory_cache(&vcpu->arch.mmu_rmap_desc_cache,
- rmap_desc_cache, 1);
+ rmap_desc_cache, 4);
if (r)
goto out;
r = mmu_topup_memory_cache_page(&vcpu->arch.mmu_page_cache, 8);
BUG_ON(!mc->nobjs);
p = mc->objects[--mc->nobjs];
- memset(p, 0, size);
return p;
}
{
int *write_count;
- write_count = slot_largepage_idx(gfn, gfn_to_memslot(kvm, gfn));
+ gfn = unalias_gfn(kvm, gfn);
+ write_count = slot_largepage_idx(gfn,
+ gfn_to_memslot_unaliased(kvm, gfn));
*write_count += 1;
}
{
int *write_count;
- write_count = slot_largepage_idx(gfn, gfn_to_memslot(kvm, gfn));
+ gfn = unalias_gfn(kvm, gfn);
+ write_count = slot_largepage_idx(gfn,
+ gfn_to_memslot_unaliased(kvm, gfn));
*write_count -= 1;
WARN_ON(*write_count < 0);
}
static int has_wrprotected_page(struct kvm *kvm, gfn_t gfn)
{
- struct kvm_memory_slot *slot = gfn_to_memslot(kvm, gfn);
+ struct kvm_memory_slot *slot;
int *largepage_idx;
+ gfn = unalias_gfn(kvm, gfn);
+ slot = gfn_to_memslot_unaliased(kvm, gfn);
if (slot) {
largepage_idx = slot_largepage_idx(gfn, slot);
return *largepage_idx;
*
* If rmapp bit zero is one, (then rmap & ~1) points to a struct kvm_rmap_desc
* containing more mappings.
+ *
+ * Returns the number of rmap entries before the spte was added or zero if
+ * the spte was not added.
+ *
*/
-static void rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn, int lpage)
+static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn, int lpage)
{
struct kvm_mmu_page *sp;
struct kvm_rmap_desc *desc;
unsigned long *rmapp;
- int i;
+ int i, count = 0;
- if (!is_rmap_pte(*spte))
- return;
+ if (!is_rmap_spte(*spte))
+ return count;
gfn = unalias_gfn(vcpu->kvm, gfn);
sp = page_header(__pa(spte));
sp->gfns[spte - sp->spt] = gfn;
} 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 *)*rmapp;
- desc->shadow_ptes[1] = spte;
+ desc->sptes[0] = (u64 *)*rmapp;
+ desc->sptes[1] = spte;
*rmapp = (unsigned long)desc | 1;
} else {
rmap_printk("rmap_add: %p %llx many->many\n", spte, *spte);
desc = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
- while (desc->shadow_ptes[RMAP_EXT-1] && desc->more)
+ while (desc->sptes[RMAP_EXT-1] && desc->more) {
desc = desc->more;
- if (desc->shadow_ptes[RMAP_EXT-1]) {
+ count += RMAP_EXT;
+ }
+ if (desc->sptes[RMAP_EXT-1]) {
desc->more = mmu_alloc_rmap_desc(vcpu);
desc = desc->more;
}
- for (i = 0; desc->shadow_ptes[i]; ++i)
+ for (i = 0; desc->sptes[i]; ++i)
;
- desc->shadow_ptes[i] = spte;
+ desc->sptes[i] = spte;
}
+ return count;
}
static void rmap_desc_remove_entry(unsigned long *rmapp,
{
int j;
- for (j = RMAP_EXT - 1; !desc->shadow_ptes[j] && j > i; --j)
+ for (j = RMAP_EXT - 1; !desc->sptes[j] && j > i; --j)
;
- desc->shadow_ptes[i] = desc->shadow_ptes[j];
- desc->shadow_ptes[j] = NULL;
+ desc->sptes[i] = desc->sptes[j];
+ desc->sptes[j] = NULL;
if (j != 0)
return;
if (!prev_desc && !desc->more)
- *rmapp = (unsigned long)desc->shadow_ptes[0];
+ *rmapp = (unsigned long)desc->sptes[0];
else
if (prev_desc)
prev_desc->more = desc->more;
unsigned long *rmapp;
int i;
- if (!is_rmap_pte(*spte))
+ if (!is_rmap_spte(*spte))
return;
sp = page_header(__pa(spte));
pfn = spte_to_pfn(*spte);
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) {
+ for (i = 0; i < RMAP_EXT && desc->sptes[i]; ++i)
+ if (desc->sptes[i] == spte) {
rmap_desc_remove_entry(rmapp,
desc, i,
prev_desc);
prev_desc = NULL;
prev_spte = NULL;
while (desc) {
- for (i = 0; i < RMAP_EXT && desc->shadow_ptes[i]; ++i) {
+ for (i = 0; i < RMAP_EXT && desc->sptes[i]; ++i) {
if (prev_spte == spte)
- return desc->shadow_ptes[i];
- prev_spte = desc->shadow_ptes[i];
+ return desc->sptes[i];
+ prev_spte = desc->sptes[i];
}
desc = desc->more;
}
return NULL;
}
-static void rmap_write_protect(struct kvm *kvm, u64 gfn)
+static int rmap_write_protect(struct kvm *kvm, u64 gfn)
{
unsigned long *rmapp;
u64 *spte;
BUG_ON(!(*spte & PT_PRESENT_MASK));
rmap_printk("rmap_write_protect: spte %p %llx\n", spte, *spte);
if (is_writeble_pte(*spte)) {
- set_shadow_pte(spte, *spte & ~PT_WRITABLE_MASK);
+ __set_spte(spte, *spte & ~PT_WRITABLE_MASK);
write_protected = 1;
}
spte = rmap_next(kvm, rmapp, spte);
if (is_writeble_pte(*spte)) {
rmap_remove(kvm, spte);
--kvm->stat.lpages;
- set_shadow_pte(spte, shadow_trap_nonpresent_pte);
+ __set_spte(spte, shadow_trap_nonpresent_pte);
spte = NULL;
write_protected = 1;
}
spte = rmap_next(kvm, rmapp, spte);
}
- if (write_protected)
- kvm_flush_remote_tlbs(kvm);
-
- account_shadowed(kvm, gfn);
+ return write_protected;
}
static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp)
BUG_ON(!(*spte & PT_PRESENT_MASK));
rmap_printk("kvm_rmap_unmap_hva: spte %p %llx\n", spte, *spte);
rmap_remove(kvm, spte);
- set_shadow_pte(spte, shadow_trap_nonpresent_pte);
+ __set_spte(spte, shadow_trap_nonpresent_pte);
need_tlb_flush = 1;
}
return need_tlb_flush;
return young;
}
+#define RMAP_RECYCLE_THRESHOLD 1000
+
+static void rmap_recycle(struct kvm_vcpu *vcpu, gfn_t gfn, int lpage)
+{
+ unsigned long *rmapp;
+
+ gfn = unalias_gfn(vcpu->kvm, gfn);
+ rmapp = gfn_to_rmap(vcpu->kvm, gfn, lpage);
+
+ kvm_unmap_rmapp(vcpu->kvm, rmapp);
+ kvm_flush_remote_tlbs(vcpu->kvm);
+}
+
int kvm_age_hva(struct kvm *kvm, unsigned long hva)
{
return kvm_handle_hva(kvm, hva, kvm_age_rmapp);
sp->gfns = mmu_memory_cache_alloc(&vcpu->arch.mmu_page_cache, PAGE_SIZE);
set_page_private(virt_to_page(sp->spt), (unsigned long)sp);
list_add(&sp->link, &vcpu->kvm->arch.active_mmu_pages);
- ASSERT(is_empty_shadow_page(sp->spt));
- sp->slot_bitmap = 0;
+ INIT_LIST_HEAD(&sp->oos_link);
+ bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
sp->multimapped = 0;
sp->parent_pte = parent_pte;
--vcpu->kvm->arch.n_free_mmu_pages;
BUG();
}
+
+static void mmu_parent_walk(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
+ mmu_parent_walk_fn fn)
+{
+ struct kvm_pte_chain *pte_chain;
+ struct hlist_node *node;
+ struct kvm_mmu_page *parent_sp;
+ int i;
+
+ if (!sp->multimapped && sp->parent_pte) {
+ parent_sp = page_header(__pa(sp->parent_pte));
+ fn(vcpu, parent_sp);
+ mmu_parent_walk(vcpu, parent_sp, fn);
+ return;
+ }
+ hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link)
+ for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) {
+ if (!pte_chain->parent_ptes[i])
+ break;
+ parent_sp = page_header(__pa(pte_chain->parent_ptes[i]));
+ fn(vcpu, parent_sp);
+ mmu_parent_walk(vcpu, parent_sp, fn);
+ }
+}
+
+static void kvm_mmu_update_unsync_bitmap(u64 *spte)
+{
+ unsigned int index;
+ struct kvm_mmu_page *sp = page_header(__pa(spte));
+
+ index = spte - sp->spt;
+ if (!__test_and_set_bit(index, sp->unsync_child_bitmap))
+ sp->unsync_children++;
+ WARN_ON(!sp->unsync_children);
+}
+
+static void kvm_mmu_update_parents_unsync(struct kvm_mmu_page *sp)
+{
+ struct kvm_pte_chain *pte_chain;
+ struct hlist_node *node;
+ int i;
+
+ if (!sp->parent_pte)
+ return;
+
+ if (!sp->multimapped) {
+ kvm_mmu_update_unsync_bitmap(sp->parent_pte);
+ return;
+ }
+
+ hlist_for_each_entry(pte_chain, node, &sp->parent_ptes, link)
+ for (i = 0; i < NR_PTE_CHAIN_ENTRIES; ++i) {
+ if (!pte_chain->parent_ptes[i])
+ break;
+ kvm_mmu_update_unsync_bitmap(pte_chain->parent_ptes[i]);
+ }
+}
+
+static int unsync_walk_fn(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
+{
+ kvm_mmu_update_parents_unsync(sp);
+ return 1;
+}
+
+static void kvm_mmu_mark_parents_unsync(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *sp)
+{
+ mmu_parent_walk(vcpu, sp, unsync_walk_fn);
+ kvm_mmu_update_parents_unsync(sp);
+}
+
static void nonpaging_prefetch_page(struct kvm_vcpu *vcpu,
struct kvm_mmu_page *sp)
{
return 1;
}
+static void nonpaging_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
+{
+}
+
+#define KVM_PAGE_ARRAY_NR 16
+
+struct kvm_mmu_pages {
+ struct mmu_page_and_offset {
+ struct kvm_mmu_page *sp;
+ unsigned int idx;
+ } page[KVM_PAGE_ARRAY_NR];
+ unsigned int nr;
+};
+
+#define for_each_unsync_children(bitmap, idx) \
+ for (idx = find_first_bit(bitmap, 512); \
+ idx < 512; \
+ idx = find_next_bit(bitmap, 512, idx+1))
+
+static int mmu_pages_add(struct kvm_mmu_pages *pvec, struct kvm_mmu_page *sp,
+ int idx)
+{
+ int i;
+
+ if (sp->unsync)
+ for (i=0; i < pvec->nr; i++)
+ if (pvec->page[i].sp == sp)
+ return 0;
+
+ pvec->page[pvec->nr].sp = sp;
+ pvec->page[pvec->nr].idx = idx;
+ pvec->nr++;
+ return (pvec->nr == KVM_PAGE_ARRAY_NR);
+}
+
+static int __mmu_unsync_walk(struct kvm_mmu_page *sp,
+ struct kvm_mmu_pages *pvec)
+{
+ int i, ret, nr_unsync_leaf = 0;
+
+ for_each_unsync_children(sp->unsync_child_bitmap, i) {
+ u64 ent = sp->spt[i];
+
+ if (is_shadow_present_pte(ent) && !is_large_pte(ent)) {
+ struct kvm_mmu_page *child;
+ child = page_header(ent & PT64_BASE_ADDR_MASK);
+
+ if (child->unsync_children) {
+ if (mmu_pages_add(pvec, child, i))
+ return -ENOSPC;
+
+ ret = __mmu_unsync_walk(child, pvec);
+ if (!ret)
+ __clear_bit(i, sp->unsync_child_bitmap);
+ else if (ret > 0)
+ nr_unsync_leaf += ret;
+ else
+ return ret;
+ }
+
+ if (child->unsync) {
+ nr_unsync_leaf++;
+ if (mmu_pages_add(pvec, child, i))
+ return -ENOSPC;
+ }
+ }
+ }
+
+ if (find_first_bit(sp->unsync_child_bitmap, 512) == 512)
+ sp->unsync_children = 0;
+
+ return nr_unsync_leaf;
+}
+
+static int mmu_unsync_walk(struct kvm_mmu_page *sp,
+ struct kvm_mmu_pages *pvec)
+{
+ if (!sp->unsync_children)
+ return 0;
+
+ mmu_pages_add(pvec, sp, 0);
+ return __mmu_unsync_walk(sp, pvec);
+}
+
static struct kvm_mmu_page *kvm_mmu_lookup_page(struct kvm *kvm, gfn_t gfn)
{
unsigned index;
index = kvm_page_table_hashfn(gfn);
bucket = &kvm->arch.mmu_page_hash[index];
hlist_for_each_entry(sp, node, bucket, hash_link)
- if (sp->gfn == gfn && !sp->role.metaphysical
+ if (sp->gfn == gfn && !sp->role.direct
&& !sp->role.invalid) {
pgprintk("%s: found role %x\n",
__func__, sp->role.word);
return NULL;
}
+static void kvm_unlink_unsync_page(struct kvm *kvm, struct kvm_mmu_page *sp)
+{
+ WARN_ON(!sp->unsync);
+ sp->unsync = 0;
+ --kvm->stat.mmu_unsync;
+}
+
+static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp);
+
+static int kvm_sync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
+{
+ if (sp->role.glevels != vcpu->arch.mmu.root_level) {
+ kvm_mmu_zap_page(vcpu->kvm, sp);
+ return 1;
+ }
+
+ if (rmap_write_protect(vcpu->kvm, sp->gfn))
+ kvm_flush_remote_tlbs(vcpu->kvm);
+ kvm_unlink_unsync_page(vcpu->kvm, sp);
+ if (vcpu->arch.mmu.sync_page(vcpu, sp)) {
+ kvm_mmu_zap_page(vcpu->kvm, sp);
+ return 1;
+ }
+
+ kvm_mmu_flush_tlb(vcpu);
+ return 0;
+}
+
+struct mmu_page_path {
+ struct kvm_mmu_page *parent[PT64_ROOT_LEVEL-1];
+ unsigned int idx[PT64_ROOT_LEVEL-1];
+};
+
+#define for_each_sp(pvec, sp, parents, i) \
+ for (i = mmu_pages_next(&pvec, &parents, -1), \
+ sp = pvec.page[i].sp; \
+ i < pvec.nr && ({ sp = pvec.page[i].sp; 1;}); \
+ i = mmu_pages_next(&pvec, &parents, i))
+
+static int mmu_pages_next(struct kvm_mmu_pages *pvec,
+ struct mmu_page_path *parents,
+ int i)
+{
+ int n;
+
+ for (n = i+1; n < pvec->nr; n++) {
+ struct kvm_mmu_page *sp = pvec->page[n].sp;
+
+ if (sp->role.level == PT_PAGE_TABLE_LEVEL) {
+ parents->idx[0] = pvec->page[n].idx;
+ return n;
+ }
+
+ parents->parent[sp->role.level-2] = sp;
+ parents->idx[sp->role.level-1] = pvec->page[n].idx;
+ }
+
+ return n;
+}
+
+static void mmu_pages_clear_parents(struct mmu_page_path *parents)
+{
+ struct kvm_mmu_page *sp;
+ unsigned int level = 0;
+
+ do {
+ unsigned int idx = parents->idx[level];
+
+ sp = parents->parent[level];
+ if (!sp)
+ return;
+
+ --sp->unsync_children;
+ WARN_ON((int)sp->unsync_children < 0);
+ __clear_bit(idx, sp->unsync_child_bitmap);
+ level++;
+ } while (level < PT64_ROOT_LEVEL-1 && !sp->unsync_children);
+}
+
+static void kvm_mmu_pages_init(struct kvm_mmu_page *parent,
+ struct mmu_page_path *parents,
+ struct kvm_mmu_pages *pvec)
+{
+ parents->parent[parent->role.level-1] = NULL;
+ pvec->nr = 0;
+}
+
+static void mmu_sync_children(struct kvm_vcpu *vcpu,
+ struct kvm_mmu_page *parent)
+{
+ int i;
+ struct kvm_mmu_page *sp;
+ struct mmu_page_path parents;
+ struct kvm_mmu_pages pages;
+
+ kvm_mmu_pages_init(parent, &parents, &pages);
+ while (mmu_unsync_walk(parent, &pages)) {
+ int protected = 0;
+
+ for_each_sp(pages, sp, parents, i)
+ protected |= rmap_write_protect(vcpu->kvm, sp->gfn);
+
+ if (protected)
+ kvm_flush_remote_tlbs(vcpu->kvm);
+
+ for_each_sp(pages, sp, parents, i) {
+ kvm_sync_page(vcpu, sp);
+ mmu_pages_clear_parents(&parents);
+ }
+ cond_resched_lock(&vcpu->kvm->mmu_lock);
+ kvm_mmu_pages_init(parent, &parents, &pages);
+ }
+}
+
static struct kvm_mmu_page *kvm_mmu_get_page(struct kvm_vcpu *vcpu,
gfn_t gfn,
gva_t gaddr,
unsigned level,
- int metaphysical,
+ int direct,
unsigned access,
u64 *parent_pte)
{
unsigned quadrant;
struct hlist_head *bucket;
struct kvm_mmu_page *sp;
- struct hlist_node *node;
+ struct hlist_node *node, *tmp;
- role.word = 0;
- role.glevels = vcpu->arch.mmu.root_level;
+ role = vcpu->arch.mmu.base_role;
role.level = level;
- role.metaphysical = metaphysical;
+ role.direct = direct;
role.access = access;
if (vcpu->arch.mmu.root_level <= PT32_ROOT_LEVEL) {
quadrant = gaddr >> (PAGE_SHIFT + (PT64_PT_BITS * level));
gfn, role.word);
index = kvm_page_table_hashfn(gfn);
bucket = &vcpu->kvm->arch.mmu_page_hash[index];
- hlist_for_each_entry(sp, node, bucket, hash_link)
- if (sp->gfn == gfn && sp->role.word == role.word) {
+ hlist_for_each_entry_safe(sp, node, tmp, bucket, hash_link)
+ if (sp->gfn == gfn) {
+ if (sp->unsync)
+ if (kvm_sync_page(vcpu, sp))
+ continue;
+
+ if (sp->role.word != role.word)
+ continue;
+
mmu_page_add_parent_pte(vcpu, sp, parent_pte);
+ if (sp->unsync_children) {
+ set_bit(KVM_REQ_MMU_SYNC, &vcpu->requests);
+ kvm_mmu_mark_parents_unsync(vcpu, sp);
+ }
pgprintk("%s: found\n", __func__);
return sp;
}
sp->gfn = gfn;
sp->role = role;
hlist_add_head(&sp->hash_link, bucket);
- if (!metaphysical)
- rmap_write_protect(vcpu->kvm, gfn);
+ if (!direct) {
+ if (rmap_write_protect(vcpu->kvm, gfn))
+ kvm_flush_remote_tlbs(vcpu->kvm);
+ account_shadowed(vcpu->kvm, gfn);
+ }
if (shadow_trap_nonpresent_pte != shadow_notrap_nonpresent_pte)
vcpu->arch.mmu.prefetch_page(vcpu, sp);
else
return sp;
}
-static int walk_shadow(struct kvm_shadow_walk *walker,
- struct kvm_vcpu *vcpu, u64 addr)
+static void shadow_walk_init(struct kvm_shadow_walk_iterator *iterator,
+ struct kvm_vcpu *vcpu, u64 addr)
{
- hpa_t shadow_addr;
- int level;
- int r;
- u64 *sptep;
- unsigned index;
-
- shadow_addr = vcpu->arch.mmu.root_hpa;
- level = vcpu->arch.mmu.shadow_root_level;
- if (level == PT32E_ROOT_LEVEL) {
- shadow_addr = vcpu->arch.mmu.pae_root[(addr >> 30) & 3];
- shadow_addr &= PT64_BASE_ADDR_MASK;
- --level;
+ iterator->addr = addr;
+ iterator->shadow_addr = vcpu->arch.mmu.root_hpa;
+ iterator->level = vcpu->arch.mmu.shadow_root_level;
+ if (iterator->level == PT32E_ROOT_LEVEL) {
+ iterator->shadow_addr
+ = vcpu->arch.mmu.pae_root[(addr >> 30) & 3];
+ iterator->shadow_addr &= PT64_BASE_ADDR_MASK;
+ --iterator->level;
+ if (!iterator->shadow_addr)
+ iterator->level = 0;
}
+}
- while (level >= PT_PAGE_TABLE_LEVEL) {
- index = SHADOW_PT_INDEX(addr, level);
- sptep = ((u64 *)__va(shadow_addr)) + index;
- r = walker->entry(walker, vcpu, addr, sptep, level);
- if (r)
- return r;
- shadow_addr = *sptep & PT64_BASE_ADDR_MASK;
- --level;
- }
- return 0;
+static bool shadow_walk_okay(struct kvm_shadow_walk_iterator *iterator)
+{
+ if (iterator->level < PT_PAGE_TABLE_LEVEL)
+ return false;
+ iterator->index = SHADOW_PT_INDEX(iterator->addr, iterator->level);
+ iterator->sptep = ((u64 *)__va(iterator->shadow_addr)) + iterator->index;
+ return true;
+}
+
+static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator)
+{
+ iterator->shadow_addr = *iterator->sptep & PT64_BASE_ADDR_MASK;
+ --iterator->level;
}
static void kvm_mmu_page_unlink_children(struct kvm *kvm,
pt = sp->spt;
- if (sp->role.level == PT_PAGE_TABLE_LEVEL) {
- for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
- if (is_shadow_present_pte(pt[i]))
- rmap_remove(kvm, &pt[i]);
- pt[i] = shadow_trap_nonpresent_pte;
- }
- return;
- }
-
for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
ent = pt[i];
if (is_shadow_present_pte(ent)) {
- if (!is_large_pte(ent)) {
+ if (!is_last_spte(ent, sp->role.level)) {
ent &= PT64_BASE_ADDR_MASK;
mmu_page_remove_parent_pte(page_header(ent),
&pt[i]);
} else {
- --kvm->stat.lpages;
+ if (is_large_pte(ent))
+ --kvm->stat.lpages;
rmap_remove(kvm, &pt[i]);
}
}
static void kvm_mmu_reset_last_pte_updated(struct kvm *kvm)
{
int i;
+ struct kvm_vcpu *vcpu;
- for (i = 0; i < KVM_MAX_VCPUS; ++i)
- if (kvm->vcpus[i])
- kvm->vcpus[i]->arch.last_pte_updated = NULL;
+ kvm_for_each_vcpu(i, vcpu, kvm)
+ vcpu->arch.last_pte_updated = NULL;
}
static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp)
}
BUG_ON(!parent_pte);
kvm_mmu_put_page(sp, parent_pte);
- set_shadow_pte(parent_pte, shadow_trap_nonpresent_pte);
+ __set_spte(parent_pte, shadow_trap_nonpresent_pte);
+ }
+}
+
+static int mmu_zap_unsync_children(struct kvm *kvm,
+ struct kvm_mmu_page *parent)
+{
+ int i, zapped = 0;
+ struct mmu_page_path parents;
+ struct kvm_mmu_pages pages;
+
+ if (parent->role.level == PT_PAGE_TABLE_LEVEL)
+ return 0;
+
+ kvm_mmu_pages_init(parent, &parents, &pages);
+ while (mmu_unsync_walk(parent, &pages)) {
+ struct kvm_mmu_page *sp;
+
+ for_each_sp(pages, sp, parents, i) {
+ kvm_mmu_zap_page(kvm, sp);
+ mmu_pages_clear_parents(&parents);
+ }
+ zapped += pages.nr;
+ kvm_mmu_pages_init(parent, &parents, &pages);
}
+
+ return zapped;
}
-static void kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp)
+static int kvm_mmu_zap_page(struct kvm *kvm, struct kvm_mmu_page *sp)
{
+ int ret;
++kvm->stat.mmu_shadow_zapped;
+ ret = mmu_zap_unsync_children(kvm, sp);
kvm_mmu_page_unlink_children(kvm, sp);
kvm_mmu_unlink_parents(kvm, sp);
kvm_flush_remote_tlbs(kvm);
- if (!sp->role.invalid && !sp->role.metaphysical)
+ if (!sp->role.invalid && !sp->role.direct)
unaccount_shadowed(kvm, sp->gfn);
+ if (sp->unsync)
+ kvm_unlink_unsync_page(kvm, sp);
if (!sp->root_count) {
hlist_del(&sp->hash_link);
kvm_mmu_free_page(kvm, sp);
kvm_reload_remote_mmus(kvm);
}
kvm_mmu_reset_last_pte_updated(kvm);
+ return ret;
}
/*
*/
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages)
{
+ int used_pages;
+
+ used_pages = kvm->arch.n_alloc_mmu_pages - kvm->arch.n_free_mmu_pages;
+ used_pages = max(0, used_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->arch.n_alloc_mmu_pages - kvm->arch.n_free_mmu_pages) >
- kvm_nr_mmu_pages) {
- int n_used_mmu_pages = kvm->arch.n_alloc_mmu_pages
- - kvm->arch.n_free_mmu_pages;
-
- while (n_used_mmu_pages > kvm_nr_mmu_pages) {
+ if (used_pages > kvm_nr_mmu_pages) {
+ while (used_pages > kvm_nr_mmu_pages) {
struct kvm_mmu_page *page;
page = container_of(kvm->arch.active_mmu_pages.prev,
struct kvm_mmu_page, link);
kvm_mmu_zap_page(kvm, page);
- n_used_mmu_pages--;
+ used_pages--;
}
kvm->arch.n_free_mmu_pages = 0;
}
index = kvm_page_table_hashfn(gfn);
bucket = &kvm->arch.mmu_page_hash[index];
hlist_for_each_entry_safe(sp, node, n, bucket, hash_link)
- if (sp->gfn == gfn && !sp->role.metaphysical) {
+ if (sp->gfn == gfn && !sp->role.direct) {
pgprintk("%s: gfn %lx role %x\n", __func__, gfn,
sp->role.word);
- kvm_mmu_zap_page(kvm, sp);
r = 1;
+ if (kvm_mmu_zap_page(kvm, sp))
+ n = bucket->first;
}
return r;
}
static void mmu_unshadow(struct kvm *kvm, gfn_t gfn)
{
+ unsigned index;
+ struct hlist_head *bucket;
struct kvm_mmu_page *sp;
+ struct hlist_node *node, *nn;
- while ((sp = kvm_mmu_lookup_page(kvm, gfn)) != NULL) {
- pgprintk("%s: zap %lx %x\n", __func__, gfn, sp->role.word);
- kvm_mmu_zap_page(kvm, sp);
+ index = kvm_page_table_hashfn(gfn);
+ bucket = &kvm->arch.mmu_page_hash[index];
+ hlist_for_each_entry_safe(sp, node, nn, bucket, hash_link) {
+ if (sp->gfn == gfn && !sp->role.direct
+ && !sp->role.invalid) {
+ pgprintk("%s: zap %lx %x\n",
+ __func__, gfn, sp->role.word);
+ kvm_mmu_zap_page(kvm, sp);
+ }
}
}
int slot = memslot_id(kvm, gfn_to_memslot(kvm, gfn));
struct kvm_mmu_page *sp = page_header(__pa(pte));
- __set_bit(slot, &sp->slot_bitmap);
+ __set_bit(slot, sp->slot_bitmap);
+}
+
+static void mmu_convert_notrap(struct kvm_mmu_page *sp)
+{
+ int i;
+ u64 *pt = sp->spt;
+
+ if (shadow_trap_nonpresent_pte == shadow_notrap_nonpresent_pte)
+ return;
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+ if (pt[i] == shadow_notrap_nonpresent_pte)
+ __set_spte(&pt[i], shadow_trap_nonpresent_pte);
+ }
}
struct page *gva_to_page(struct kvm_vcpu *vcpu, gva_t gva)
return page;
}
-static int set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
+/*
+ * The function is based on mtrr_type_lookup() in
+ * arch/x86/kernel/cpu/mtrr/generic.c
+ */
+static int get_mtrr_type(struct mtrr_state_type *mtrr_state,
+ u64 start, u64 end)
+{
+ int i;
+ u64 base, mask;
+ u8 prev_match, curr_match;
+ int num_var_ranges = KVM_NR_VAR_MTRR;
+
+ if (!mtrr_state->enabled)
+ return 0xFF;
+
+ /* Make end inclusive end, instead of exclusive */
+ end--;
+
+ /* Look in fixed ranges. Just return the type as per start */
+ if (mtrr_state->have_fixed && (start < 0x100000)) {
+ int idx;
+
+ if (start < 0x80000) {
+ idx = 0;
+ idx += (start >> 16);
+ return mtrr_state->fixed_ranges[idx];
+ } else if (start < 0xC0000) {
+ idx = 1 * 8;
+ idx += ((start - 0x80000) >> 14);
+ return mtrr_state->fixed_ranges[idx];
+ } else if (start < 0x1000000) {
+ idx = 3 * 8;
+ idx += ((start - 0xC0000) >> 12);
+ return mtrr_state->fixed_ranges[idx];
+ }
+ }
+
+ /*
+ * Look in variable ranges
+ * Look of multiple ranges matching this address and pick type
+ * as per MTRR precedence
+ */
+ if (!(mtrr_state->enabled & 2))
+ return mtrr_state->def_type;
+
+ prev_match = 0xFF;
+ for (i = 0; i < num_var_ranges; ++i) {
+ unsigned short start_state, end_state;
+
+ if (!(mtrr_state->var_ranges[i].mask_lo & (1 << 11)))
+ continue;
+
+ base = (((u64)mtrr_state->var_ranges[i].base_hi) << 32) +
+ (mtrr_state->var_ranges[i].base_lo & PAGE_MASK);
+ mask = (((u64)mtrr_state->var_ranges[i].mask_hi) << 32) +
+ (mtrr_state->var_ranges[i].mask_lo & PAGE_MASK);
+
+ start_state = ((start & mask) == (base & mask));
+ end_state = ((end & mask) == (base & mask));
+ if (start_state != end_state)
+ return 0xFE;
+
+ if ((start & mask) != (base & mask))
+ continue;
+
+ curr_match = mtrr_state->var_ranges[i].base_lo & 0xff;
+ if (prev_match == 0xFF) {
+ prev_match = curr_match;
+ continue;
+ }
+
+ if (prev_match == MTRR_TYPE_UNCACHABLE ||
+ curr_match == MTRR_TYPE_UNCACHABLE)
+ return MTRR_TYPE_UNCACHABLE;
+
+ if ((prev_match == MTRR_TYPE_WRBACK &&
+ curr_match == MTRR_TYPE_WRTHROUGH) ||
+ (prev_match == MTRR_TYPE_WRTHROUGH &&
+ curr_match == MTRR_TYPE_WRBACK)) {
+ prev_match = MTRR_TYPE_WRTHROUGH;
+ curr_match = MTRR_TYPE_WRTHROUGH;
+ }
+
+ if (prev_match != curr_match)
+ return MTRR_TYPE_UNCACHABLE;
+ }
+
+ if (prev_match != 0xFF)
+ return prev_match;
+
+ return mtrr_state->def_type;
+}
+
+u8 kvm_get_guest_memory_type(struct kvm_vcpu *vcpu, gfn_t gfn)
+{
+ u8 mtrr;
+
+ mtrr = get_mtrr_type(&vcpu->arch.mtrr_state, gfn << PAGE_SHIFT,
+ (gfn << PAGE_SHIFT) + PAGE_SIZE);
+ if (mtrr == 0xfe || mtrr == 0xff)
+ mtrr = MTRR_TYPE_WRBACK;
+ return mtrr;
+}
+EXPORT_SYMBOL_GPL(kvm_get_guest_memory_type);
+
+static int kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
+{
+ unsigned index;
+ struct hlist_head *bucket;
+ struct kvm_mmu_page *s;
+ struct hlist_node *node, *n;
+
+ index = kvm_page_table_hashfn(sp->gfn);
+ bucket = &vcpu->kvm->arch.mmu_page_hash[index];
+ /* don't unsync if pagetable is shadowed with multiple roles */
+ hlist_for_each_entry_safe(s, node, n, bucket, hash_link) {
+ if (s->gfn != sp->gfn || s->role.direct)
+ continue;
+ if (s->role.word != sp->role.word)
+ return 1;
+ }
+ ++vcpu->kvm->stat.mmu_unsync;
+ sp->unsync = 1;
+
+ kvm_mmu_mark_parents_unsync(vcpu, sp);
+
+ mmu_convert_notrap(sp);
+ return 0;
+}
+
+static int mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn,
+ bool can_unsync)
+{
+ struct kvm_mmu_page *shadow;
+
+ shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn);
+ if (shadow) {
+ if (shadow->role.level != PT_PAGE_TABLE_LEVEL)
+ return 1;
+ if (shadow->unsync)
+ return 0;
+ if (can_unsync && oos_shadow)
+ return kvm_unsync_page(vcpu, shadow);
+ return 1;
+ }
+ return 0;
+}
+
+static int set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
unsigned pte_access, int user_fault,
int write_fault, int dirty, int largepage,
- gfn_t gfn, pfn_t pfn, bool speculative)
+ gfn_t gfn, pfn_t pfn, bool speculative,
+ bool can_unsync)
{
u64 spte;
int ret = 0;
+
/*
* We don't set the accessed bit, since we sometimes want to see
* whether the guest actually used the pte (in order to detect
spte |= shadow_user_mask;
if (largepage)
spte |= PT_PAGE_SIZE_MASK;
+ if (tdp_enabled)
+ spte |= kvm_x86_ops->get_mt_mask(vcpu, gfn,
+ kvm_is_mmio_pfn(pfn));
spte |= (u64)pfn << PAGE_SHIFT;
if ((pte_access & ACC_WRITE_MASK)
|| (write_fault && !is_write_protection(vcpu) && !user_fault)) {
- struct kvm_mmu_page *shadow;
if (largepage && has_wrprotected_page(vcpu->kvm, gfn)) {
ret = 1;
spte |= PT_WRITABLE_MASK;
- shadow = kvm_mmu_lookup_page(vcpu->kvm, gfn);
- if (shadow) {
+ /*
+ * Optimization: for pte sync, if spte was writable the hash
+ * lookup is unnecessary (and expensive). Write protection
+ * is responsibility of mmu_get_page / kvm_sync_page.
+ * Same reasoning can be applied to dirty page accounting.
+ */
+ if (!can_unsync && is_writeble_pte(*sptep))
+ goto set_pte;
+
+ if (mmu_need_write_protect(vcpu, gfn, can_unsync)) {
pgprintk("%s: found shadow page for %lx, marking ro\n",
__func__, gfn);
ret = 1;
mark_page_dirty(vcpu->kvm, gfn);
set_pte:
- set_shadow_pte(shadow_pte, spte);
+ __set_spte(sptep, spte);
return ret;
}
-
-static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *shadow_pte,
+static void mmu_set_spte(struct kvm_vcpu *vcpu, u64 *sptep,
unsigned pt_access, unsigned pte_access,
int user_fault, int write_fault, int dirty,
int *ptwrite, int largepage, gfn_t gfn,
pfn_t pfn, bool speculative)
{
int was_rmapped = 0;
- int was_writeble = is_writeble_pte(*shadow_pte);
+ int was_writeble = is_writeble_pte(*sptep);
+ int rmap_count;
pgprintk("%s: spte %llx access %x write_fault %d"
" user_fault %d gfn %lx\n",
- __func__, *shadow_pte, pt_access,
+ __func__, *sptep, pt_access,
write_fault, user_fault, gfn);
- if (is_rmap_pte(*shadow_pte)) {
+ if (is_rmap_spte(*sptep)) {
/*
* If we overwrite a PTE page pointer with a 2MB PMD, unlink
* the parent of the now unreachable PTE.
*/
- if (largepage && !is_large_pte(*shadow_pte)) {
+ if (largepage && !is_large_pte(*sptep)) {
struct kvm_mmu_page *child;
- u64 pte = *shadow_pte;
+ u64 pte = *sptep;
child = page_header(pte & PT64_BASE_ADDR_MASK);
- mmu_page_remove_parent_pte(child, shadow_pte);
- } else if (pfn != spte_to_pfn(*shadow_pte)) {
+ mmu_page_remove_parent_pte(child, sptep);
+ } else if (pfn != spte_to_pfn(*sptep)) {
pgprintk("hfn old %lx new %lx\n",
- spte_to_pfn(*shadow_pte), pfn);
- rmap_remove(vcpu->kvm, shadow_pte);
- } else {
- if (largepage)
- was_rmapped = is_large_pte(*shadow_pte);
- else
- was_rmapped = 1;
- }
+ spte_to_pfn(*sptep), pfn);
+ rmap_remove(vcpu->kvm, sptep);
+ } else
+ was_rmapped = 1;
}
- if (set_spte(vcpu, shadow_pte, pte_access, user_fault, write_fault,
- dirty, largepage, gfn, pfn, speculative)) {
+ if (set_spte(vcpu, sptep, pte_access, user_fault, write_fault,
+ dirty, largepage, gfn, pfn, speculative, true)) {
if (write_fault)
*ptwrite = 1;
kvm_x86_ops->tlb_flush(vcpu);
}
- pgprintk("%s: setting spte %llx\n", __func__, *shadow_pte);
+ pgprintk("%s: setting spte %llx\n", __func__, *sptep);
pgprintk("instantiating %s PTE (%s) at %ld (%llx) addr %p\n",
- is_large_pte(*shadow_pte)? "2MB" : "4kB",
- is_present_pte(*shadow_pte)?"RW":"R", gfn,
- *shadow_pte, shadow_pte);
- if (!was_rmapped && is_large_pte(*shadow_pte))
+ is_large_pte(*sptep)? "2MB" : "4kB",
+ is_present_pte(*sptep)?"RW":"R", gfn,
+ *shadow_pte, sptep);
+ if (!was_rmapped && is_large_pte(*sptep))
++vcpu->kvm->stat.lpages;
- page_header_update_slot(vcpu->kvm, shadow_pte, gfn);
+ page_header_update_slot(vcpu->kvm, sptep, gfn);
if (!was_rmapped) {
- rmap_add(vcpu, shadow_pte, gfn, largepage);
- if (!is_rmap_pte(*shadow_pte))
+ rmap_count = rmap_add(vcpu, sptep, gfn, largepage);
+ if (!is_rmap_spte(*sptep))
kvm_release_pfn_clean(pfn);
+ if (rmap_count > RMAP_RECYCLE_THRESHOLD)
+ rmap_recycle(vcpu, gfn, largepage);
} else {
if (was_writeble)
kvm_release_pfn_dirty(pfn);
kvm_release_pfn_clean(pfn);
}
if (speculative) {
- vcpu->arch.last_pte_updated = shadow_pte;
+ vcpu->arch.last_pte_updated = sptep;
vcpu->arch.last_pte_gfn = gfn;
}
}
{
}
-struct direct_shadow_walk {
- struct kvm_shadow_walk walker;
- pfn_t pfn;
- int write;
- int largepage;
- int pt_write;
-};
-
-static int direct_map_entry(struct kvm_shadow_walk *_walk,
- struct kvm_vcpu *vcpu,
- u64 addr, u64 *sptep, int level)
+static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
+ int largepage, gfn_t gfn, pfn_t pfn)
{
- struct direct_shadow_walk *walk =
- container_of(_walk, struct direct_shadow_walk, walker);
+ struct kvm_shadow_walk_iterator iterator;
struct kvm_mmu_page *sp;
+ int pt_write = 0;
gfn_t pseudo_gfn;
- gfn_t gfn = addr >> PAGE_SHIFT;
-
- if (level == PT_PAGE_TABLE_LEVEL
- || (walk->largepage && level == PT_DIRECTORY_LEVEL)) {
- mmu_set_spte(vcpu, sptep, ACC_ALL, ACC_ALL,
- 0, walk->write, 1, &walk->pt_write,
- walk->largepage, gfn, walk->pfn, false);
- ++vcpu->stat.pf_fixed;
- return 1;
- }
- if (*sptep == shadow_trap_nonpresent_pte) {
- pseudo_gfn = (addr & PT64_DIR_BASE_ADDR_MASK) >> PAGE_SHIFT;
- sp = kvm_mmu_get_page(vcpu, pseudo_gfn, (gva_t)addr, level - 1,
- 1, ACC_ALL, sptep);
- if (!sp) {
- pgprintk("nonpaging_map: ENOMEM\n");
- kvm_release_pfn_clean(walk->pfn);
- return -ENOMEM;
+ for_each_shadow_entry(vcpu, (u64)gfn << PAGE_SHIFT, iterator) {
+ if (iterator.level == PT_PAGE_TABLE_LEVEL
+ || (largepage && iterator.level == PT_DIRECTORY_LEVEL)) {
+ mmu_set_spte(vcpu, iterator.sptep, ACC_ALL, ACC_ALL,
+ 0, write, 1, &pt_write,
+ largepage, gfn, pfn, false);
+ ++vcpu->stat.pf_fixed;
+ break;
}
- set_shadow_pte(sptep,
- __pa(sp->spt)
- | PT_PRESENT_MASK | PT_WRITABLE_MASK
- | shadow_user_mask | shadow_x_mask);
- }
- return 0;
-}
+ if (*iterator.sptep == shadow_trap_nonpresent_pte) {
+ pseudo_gfn = (iterator.addr & PT64_DIR_BASE_ADDR_MASK) >> PAGE_SHIFT;
+ sp = kvm_mmu_get_page(vcpu, pseudo_gfn, iterator.addr,
+ iterator.level - 1,
+ 1, ACC_ALL, iterator.sptep);
+ if (!sp) {
+ pgprintk("nonpaging_map: ENOMEM\n");
+ kvm_release_pfn_clean(pfn);
+ return -ENOMEM;
+ }
-static int __direct_map(struct kvm_vcpu *vcpu, gpa_t v, int write,
- int largepage, gfn_t gfn, pfn_t pfn)
-{
- int r;
- struct direct_shadow_walk walker = {
- .walker = { .entry = direct_map_entry, },
- .pfn = pfn,
- .largepage = largepage,
- .write = write,
- .pt_write = 0,
- };
-
- r = walk_shadow(&walker.walker, vcpu, gfn << PAGE_SHIFT);
- if (r < 0)
- return r;
- return walker.pt_write;
+ __set_spte(iterator.sptep,
+ __pa(sp->spt)
+ | PT_PRESENT_MASK | PT_WRITABLE_MASK
+ | shadow_user_mask | shadow_x_mask);
+ }
+ }
+ return pt_write;
}
static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, int write, gfn_t gfn)
vcpu->arch.mmu.root_hpa = INVALID_PAGE;
}
-static void mmu_alloc_roots(struct kvm_vcpu *vcpu)
+static int mmu_check_root(struct kvm_vcpu *vcpu, gfn_t root_gfn)
+{
+ int ret = 0;
+
+ if (!kvm_is_visible_gfn(vcpu->kvm, root_gfn)) {
+ set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
+ ret = 1;
+ }
+
+ return ret;
+}
+
+static int mmu_alloc_roots(struct kvm_vcpu *vcpu)
{
int i;
gfn_t root_gfn;
struct kvm_mmu_page *sp;
- int metaphysical = 0;
+ int direct = 0;
+ u64 pdptr;
root_gfn = vcpu->arch.cr3 >> PAGE_SHIFT;
ASSERT(!VALID_PAGE(root));
if (tdp_enabled)
- metaphysical = 1;
+ direct = 1;
+ if (mmu_check_root(vcpu, root_gfn))
+ return 1;
sp = kvm_mmu_get_page(vcpu, root_gfn, 0,
- PT64_ROOT_LEVEL, metaphysical,
+ PT64_ROOT_LEVEL, direct,
ACC_ALL, NULL);
root = __pa(sp->spt);
++sp->root_count;
vcpu->arch.mmu.root_hpa = root;
- return;
+ return 0;
}
- metaphysical = !is_paging(vcpu);
+ direct = !is_paging(vcpu);
if (tdp_enabled)
- metaphysical = 1;
+ direct = 1;
for (i = 0; i < 4; ++i) {
hpa_t root = vcpu->arch.mmu.pae_root[i];
ASSERT(!VALID_PAGE(root));
if (vcpu->arch.mmu.root_level == PT32E_ROOT_LEVEL) {
- if (!is_present_pte(vcpu->arch.pdptrs[i])) {
+ pdptr = kvm_pdptr_read(vcpu, i);
+ if (!is_present_gpte(pdptr)) {
vcpu->arch.mmu.pae_root[i] = 0;
continue;
}
- root_gfn = vcpu->arch.pdptrs[i] >> PAGE_SHIFT;
+ root_gfn = pdptr >> PAGE_SHIFT;
} else if (vcpu->arch.mmu.root_level == 0)
root_gfn = 0;
+ if (mmu_check_root(vcpu, root_gfn))
+ return 1;
sp = kvm_mmu_get_page(vcpu, root_gfn, i << 30,
- PT32_ROOT_LEVEL, metaphysical,
+ PT32_ROOT_LEVEL, direct,
ACC_ALL, NULL);
root = __pa(sp->spt);
++sp->root_count;
vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK;
}
vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root);
-}
-
-static void mmu_sync_children(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
-{
+ return 0;
}
static void mmu_sync_roots(struct kvm_vcpu *vcpu)
for (i = 0; i < 4; ++i) {
hpa_t root = vcpu->arch.mmu.pae_root[i];
- if (root) {
+ if (root && VALID_PAGE(root)) {
root &= PT64_BASE_ADDR_MASK;
sp = page_header(root);
mmu_sync_children(vcpu, sp);
context->free = nonpaging_free;
context->prefetch_page = nonpaging_prefetch_page;
context->sync_page = nonpaging_sync_page;
+ context->invlpg = nonpaging_invlpg;
context->root_level = 0;
context->shadow_root_level = PT32E_ROOT_LEVEL;
context->root_hpa = INVALID_PAGE;
nonpaging_free(vcpu);
}
+static bool is_rsvd_bits_set(struct kvm_vcpu *vcpu, u64 gpte, int level)
+{
+ int bit7;
+
+ bit7 = (gpte >> 7) & 1;
+ return (gpte & vcpu->arch.mmu.rsvd_bits_mask[bit7][level-1]) != 0;
+}
+
#define PTTYPE 64
#include "paging_tmpl.h"
#undef PTTYPE
#include "paging_tmpl.h"
#undef PTTYPE
+static void reset_rsvds_bits_mask(struct kvm_vcpu *vcpu, int level)
+{
+ struct kvm_mmu *context = &vcpu->arch.mmu;
+ int maxphyaddr = cpuid_maxphyaddr(vcpu);
+ u64 exb_bit_rsvd = 0;
+
+ if (!is_nx(vcpu))
+ exb_bit_rsvd = rsvd_bits(63, 63);
+ switch (level) {
+ case PT32_ROOT_LEVEL:
+ /* no rsvd bits for 2 level 4K page table entries */
+ context->rsvd_bits_mask[0][1] = 0;
+ context->rsvd_bits_mask[0][0] = 0;
+ if (is_cpuid_PSE36())
+ /* 36bits PSE 4MB page */
+ context->rsvd_bits_mask[1][1] = rsvd_bits(17, 21);
+ else
+ /* 32 bits PSE 4MB page */
+ context->rsvd_bits_mask[1][1] = rsvd_bits(13, 21);
+ context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[1][0];
+ break;
+ case PT32E_ROOT_LEVEL:
+ context->rsvd_bits_mask[0][2] =
+ rsvd_bits(maxphyaddr, 63) |
+ rsvd_bits(7, 8) | rsvd_bits(1, 2); /* PDPTE */
+ context->rsvd_bits_mask[0][1] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 62); /* PDE */
+ context->rsvd_bits_mask[0][0] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 62); /* PTE */
+ context->rsvd_bits_mask[1][1] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 62) |
+ rsvd_bits(13, 20); /* large page */
+ context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[1][0];
+ break;
+ case PT64_ROOT_LEVEL:
+ context->rsvd_bits_mask[0][3] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8);
+ context->rsvd_bits_mask[0][2] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 51) | rsvd_bits(7, 8);
+ context->rsvd_bits_mask[0][1] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 51);
+ context->rsvd_bits_mask[0][0] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 51);
+ context->rsvd_bits_mask[1][3] = context->rsvd_bits_mask[0][3];
+ context->rsvd_bits_mask[1][2] = context->rsvd_bits_mask[0][2];
+ context->rsvd_bits_mask[1][1] = exb_bit_rsvd |
+ rsvd_bits(maxphyaddr, 51) |
+ rsvd_bits(13, 20); /* large page */
+ context->rsvd_bits_mask[1][0] = context->rsvd_bits_mask[1][0];
+ break;
+ }
+}
+
static int paging64_init_context_common(struct kvm_vcpu *vcpu, int level)
{
struct kvm_mmu *context = &vcpu->arch.mmu;
context->gva_to_gpa = paging64_gva_to_gpa;
context->prefetch_page = paging64_prefetch_page;
context->sync_page = paging64_sync_page;
+ context->invlpg = paging64_invlpg;
context->free = paging_free;
context->root_level = level;
context->shadow_root_level = level;
static int paging64_init_context(struct kvm_vcpu *vcpu)
{
+ reset_rsvds_bits_mask(vcpu, PT64_ROOT_LEVEL);
return paging64_init_context_common(vcpu, PT64_ROOT_LEVEL);
}
{
struct kvm_mmu *context = &vcpu->arch.mmu;
+ reset_rsvds_bits_mask(vcpu, PT32_ROOT_LEVEL);
context->new_cr3 = paging_new_cr3;
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->sync_page = paging32_sync_page;
+ context->invlpg = paging32_invlpg;
context->root_level = PT32_ROOT_LEVEL;
context->shadow_root_level = PT32E_ROOT_LEVEL;
context->root_hpa = INVALID_PAGE;
static int paging32E_init_context(struct kvm_vcpu *vcpu)
{
+ reset_rsvds_bits_mask(vcpu, PT32E_ROOT_LEVEL);
return paging64_init_context_common(vcpu, PT32E_ROOT_LEVEL);
}
context->free = nonpaging_free;
context->prefetch_page = nonpaging_prefetch_page;
context->sync_page = nonpaging_sync_page;
+ context->invlpg = nonpaging_invlpg;
context->shadow_root_level = kvm_x86_ops->get_tdp_level();
context->root_hpa = INVALID_PAGE;
context->gva_to_gpa = nonpaging_gva_to_gpa;
context->root_level = 0;
} else if (is_long_mode(vcpu)) {
+ reset_rsvds_bits_mask(vcpu, PT64_ROOT_LEVEL);
context->gva_to_gpa = paging64_gva_to_gpa;
context->root_level = PT64_ROOT_LEVEL;
} else if (is_pae(vcpu)) {
+ reset_rsvds_bits_mask(vcpu, PT32E_ROOT_LEVEL);
context->gva_to_gpa = paging64_gva_to_gpa;
context->root_level = PT32E_ROOT_LEVEL;
} else {
+ reset_rsvds_bits_mask(vcpu, PT32_ROOT_LEVEL);
context->gva_to_gpa = paging32_gva_to_gpa;
context->root_level = PT32_ROOT_LEVEL;
}
static int init_kvm_softmmu(struct kvm_vcpu *vcpu)
{
+ int r;
+
ASSERT(vcpu);
ASSERT(!VALID_PAGE(vcpu->arch.mmu.root_hpa));
if (!is_paging(vcpu))
- return nonpaging_init_context(vcpu);
+ r = nonpaging_init_context(vcpu);
else if (is_long_mode(vcpu))
- return paging64_init_context(vcpu);
+ r = paging64_init_context(vcpu);
else if (is_pae(vcpu))
- return paging32E_init_context(vcpu);
+ r = paging32E_init_context(vcpu);
else
- return paging32_init_context(vcpu);
+ r = paging32_init_context(vcpu);
+
+ vcpu->arch.mmu.base_role.glevels = vcpu->arch.mmu.root_level;
+
+ return r;
}
static int init_kvm_mmu(struct kvm_vcpu *vcpu)
goto out;
spin_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_free_some_pages(vcpu);
- mmu_alloc_roots(vcpu);
+ r = mmu_alloc_roots(vcpu);
mmu_sync_roots(vcpu);
spin_unlock(&vcpu->kvm->mmu_lock);
+ if (r)
+ goto out;
kvm_x86_ops->set_cr3(vcpu, vcpu->arch.mmu.root_hpa);
kvm_mmu_flush_tlb(vcpu);
out:
pte = *spte;
if (is_shadow_present_pte(pte)) {
- if (sp->role.level == PT_PAGE_TABLE_LEVEL ||
- is_large_pte(pte))
+ if (is_last_spte(pte, sp->role.level))
rmap_remove(vcpu->kvm, spte);
else {
child = page_header(pte & PT64_BASE_ADDR_MASK);
mmu_page_remove_parent_pte(child, spte);
}
}
- set_shadow_pte(spte, shadow_trap_nonpresent_pte);
+ __set_spte(spte, shadow_trap_nonpresent_pte);
if (is_large_pte(pte))
--vcpu->kvm->stat.lpages;
}
if ((bytes == 4) && (gpa % 4 == 0))
memcpy((void *)&gpte, new, 4);
}
- if (!is_present_pte(gpte))
+ if (!is_present_gpte(gpte))
return;
gfn = (gpte & PT64_BASE_ADDR_MASK) >> PAGE_SHIFT;
}
void kvm_mmu_pte_write(struct kvm_vcpu *vcpu, gpa_t gpa,
- const u8 *new, int bytes)
+ const u8 *new, int bytes,
+ bool guest_initiated)
{
gfn_t gfn = gpa >> PAGE_SHIFT;
struct kvm_mmu_page *sp;
kvm_mmu_free_some_pages(vcpu);
++vcpu->kvm->stat.mmu_pte_write;
kvm_mmu_audit(vcpu, "pre pte write");
- if (gfn == vcpu->arch.last_pt_write_gfn
- && !last_updated_pte_accessed(vcpu)) {
- ++vcpu->arch.last_pt_write_count;
- if (vcpu->arch.last_pt_write_count >= 3)
- flooded = 1;
- } else {
- vcpu->arch.last_pt_write_gfn = gfn;
- vcpu->arch.last_pt_write_count = 1;
- vcpu->arch.last_pte_updated = NULL;
+ if (guest_initiated) {
+ if (gfn == vcpu->arch.last_pt_write_gfn
+ && !last_updated_pte_accessed(vcpu)) {
+ ++vcpu->arch.last_pt_write_count;
+ if (vcpu->arch.last_pt_write_count >= 3)
+ flooded = 1;
+ } else {
+ vcpu->arch.last_pt_write_gfn = gfn;
+ vcpu->arch.last_pt_write_count = 1;
+ vcpu->arch.last_pte_updated = NULL;
+ }
}
index = kvm_page_table_hashfn(gfn);
bucket = &vcpu->kvm->arch.mmu_page_hash[index];
hlist_for_each_entry_safe(sp, node, n, bucket, hash_link) {
- if (sp->gfn != gfn || sp->role.metaphysical || sp->role.invalid)
+ if (sp->gfn != gfn || sp->role.direct || sp->role.invalid)
continue;
pte_size = sp->role.glevels == PT32_ROOT_LEVEL ? 4 : 8;
misaligned = (offset ^ (offset + bytes - 1)) & ~(pte_size - 1);
*/
pgprintk("misaligned: gpa %llx bytes %d role %x\n",
gpa, bytes, sp->role.word);
- kvm_mmu_zap_page(vcpu->kvm, sp);
+ if (kvm_mmu_zap_page(vcpu->kvm, sp))
+ n = bucket->first;
++vcpu->kvm->stat.mmu_flooded;
continue;
}
++vcpu->stat.mmio_exits;
return 0;
case EMULATE_FAIL:
- kvm_report_emulation_failure(vcpu, "pagetable");
- return 1;
+ vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
+ vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
+ return 0;
default:
BUG();
}
}
EXPORT_SYMBOL_GPL(kvm_mmu_page_fault);
+void kvm_mmu_invlpg(struct kvm_vcpu *vcpu, gva_t gva)
+{
+ vcpu->arch.mmu.invlpg(vcpu, gva);
+ kvm_mmu_flush_tlb(vcpu);
+ ++vcpu->stat.invlpg;
+}
+EXPORT_SYMBOL_GPL(kvm_mmu_invlpg);
+
void kvm_enable_tdp(void)
{
tdp_enabled = true;
static void free_mmu_pages(struct kvm_vcpu *vcpu)
{
- struct kvm_mmu_page *sp;
-
- while (!list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
- sp = container_of(vcpu->kvm->arch.active_mmu_pages.next,
- struct kvm_mmu_page, link);
- kvm_mmu_zap_page(vcpu->kvm, sp);
- cond_resched();
- }
free_page((unsigned long)vcpu->arch.mmu.pae_root);
}
{
struct kvm_mmu_page *sp;
- spin_lock(&kvm->mmu_lock);
list_for_each_entry(sp, &kvm->arch.active_mmu_pages, link) {
int i;
u64 *pt;
- if (!test_bit(slot, &sp->slot_bitmap))
+ if (!test_bit(slot, sp->slot_bitmap))
continue;
pt = sp->spt;
pt[i] &= ~PT_WRITABLE_MASK;
}
kvm_flush_remote_tlbs(kvm);
- spin_unlock(&kvm->mmu_lock);
}
void kvm_mmu_zap_all(struct kvm *kvm)
spin_lock(&kvm->mmu_lock);
list_for_each_entry_safe(sp, node, &kvm->arch.active_mmu_pages, link)
- kvm_mmu_zap_page(kvm, sp);
+ if (kvm_mmu_zap_page(kvm, sp))
+ node = container_of(kvm->arch.active_mmu_pages.next,
+ struct kvm_mmu_page, link);
spin_unlock(&kvm->mmu_lock);
kvm_flush_remote_tlbs(kvm);
static int kvm_pv_mmu_flush_tlb(struct kvm_vcpu *vcpu)
{
- kvm_x86_ops->tlb_flush(vcpu);
+ kvm_set_cr3(vcpu, vcpu->arch.cr3);
return 1;
}
return gva;
}
+
+typedef void (*inspect_spte_fn) (struct kvm *kvm, struct kvm_mmu_page *sp,
+ u64 *sptep);
+
+static void __mmu_spte_walk(struct kvm *kvm, struct kvm_mmu_page *sp,
+ inspect_spte_fn fn)
+{
+ int i;
+
+ for (i = 0; i < PT64_ENT_PER_PAGE; ++i) {
+ u64 ent = sp->spt[i];
+
+ if (is_shadow_present_pte(ent)) {
+ if (sp->role.level > 1 && !is_large_pte(ent)) {
+ struct kvm_mmu_page *child;
+ child = page_header(ent & PT64_BASE_ADDR_MASK);
+ __mmu_spte_walk(kvm, child, fn);
+ }
+ if (sp->role.level == 1)
+ fn(kvm, sp, &sp->spt[i]);
+ }
+ }
+}
+
+static void mmu_spte_walk(struct kvm_vcpu *vcpu, inspect_spte_fn fn)
+{
+ int i;
+ struct kvm_mmu_page *sp;
+
+ if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
+ return;
+ if (vcpu->arch.mmu.shadow_root_level == PT64_ROOT_LEVEL) {
+ hpa_t root = vcpu->arch.mmu.root_hpa;
+ sp = page_header(root);
+ __mmu_spte_walk(vcpu->kvm, sp, fn);
+ return;
+ }
+ for (i = 0; i < 4; ++i) {
+ hpa_t root = vcpu->arch.mmu.pae_root[i];
+
+ if (root && VALID_PAGE(root)) {
+ root &= PT64_BASE_ADDR_MASK;
+ sp = page_header(root);
+ __mmu_spte_walk(vcpu->kvm, sp, fn);
+ }
+ }
+ return;
+}
+
static void audit_mappings_page(struct kvm_vcpu *vcpu, u64 page_pte,
gva_t va, int level)
{
" in nonleaf level: levels %d gva %lx"
" level %d pte %llx\n", audit_msg,
vcpu->arch.mmu.root_level, va, level, ent);
-
- audit_mappings_page(vcpu, ent, va, level - 1);
+ else
+ audit_mappings_page(vcpu, ent, va, level - 1);
} else {
gpa_t gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, va);
- hpa_t hpa = (hpa_t)gpa_to_pfn(vcpu, gpa) << PAGE_SHIFT;
+ gfn_t gfn = gpa >> PAGE_SHIFT;
+ pfn_t pfn = gfn_to_pfn(vcpu->kvm, gfn);
+ hpa_t hpa = (hpa_t)pfn << PAGE_SHIFT;
if (is_shadow_present_pte(ent)
&& (ent & PT64_BASE_ADDR_MASK) != hpa)
d = (struct kvm_rmap_desc *)(*rmapp & ~1ul);
while (d) {
for (k = 0; k < RMAP_EXT; ++k)
- if (d->shadow_ptes[k])
+ if (d->sptes[k])
++nmaps;
else
break;
return nmaps;
}
-static int count_writable_mappings(struct kvm_vcpu *vcpu)
+void inspect_spte_has_rmap(struct kvm *kvm, struct kvm_mmu_page *sp, u64 *sptep)
+{
+ unsigned long *rmapp;
+ struct kvm_mmu_page *rev_sp;
+ gfn_t gfn;
+
+ if (*sptep & PT_WRITABLE_MASK) {
+ rev_sp = page_header(__pa(sptep));
+ gfn = rev_sp->gfns[sptep - rev_sp->spt];
+
+ if (!gfn_to_memslot(kvm, gfn)) {
+ if (!printk_ratelimit())
+ return;
+ printk(KERN_ERR "%s: no memslot for gfn %ld\n",
+ audit_msg, gfn);
+ printk(KERN_ERR "%s: index %ld of sp (gfn=%lx)\n",
+ audit_msg, sptep - rev_sp->spt,
+ rev_sp->gfn);
+ dump_stack();
+ return;
+ }
+
+ rmapp = gfn_to_rmap(kvm, rev_sp->gfns[sptep - rev_sp->spt], 0);
+ if (!*rmapp) {
+ if (!printk_ratelimit())
+ return;
+ printk(KERN_ERR "%s: no rmap for writable spte %llx\n",
+ audit_msg, *sptep);
+ dump_stack();
+ }
+ }
+
+}
+
+void audit_writable_sptes_have_rmaps(struct kvm_vcpu *vcpu)
+{
+ mmu_spte_walk(vcpu, inspect_spte_has_rmap);
+}
+
+static void check_writable_mappings_rmap(struct kvm_vcpu *vcpu)
{
- int nmaps = 0;
struct kvm_mmu_page *sp;
int i;
continue;
if (!(ent & PT_WRITABLE_MASK))
continue;
- ++nmaps;
+ inspect_spte_has_rmap(vcpu->kvm, sp, &pt[i]);
}
}
- return nmaps;
+ return;
}
static void audit_rmap(struct kvm_vcpu *vcpu)
{
- int n_rmap = count_rmaps(vcpu);
- int n_actual = count_writable_mappings(vcpu);
-
- if (n_rmap != n_actual)
- printk(KERN_ERR "%s: (%s) rmap %d actual %d\n",
- __func__, audit_msg, n_rmap, n_actual);
+ check_writable_mappings_rmap(vcpu);
+ count_rmaps(vcpu);
}
static void audit_write_protection(struct kvm_vcpu *vcpu)
struct kvm_mmu_page *sp;
struct kvm_memory_slot *slot;
unsigned long *rmapp;
+ u64 *spte;
gfn_t gfn;
list_for_each_entry(sp, &vcpu->kvm->arch.active_mmu_pages, link) {
- if (sp->role.metaphysical)
+ if (sp->role.direct)
+ continue;
+ if (sp->unsync)
continue;
- slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
gfn = unalias_gfn(vcpu->kvm, sp->gfn);
+ slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->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",
+
+ spte = rmap_next(vcpu->kvm, rmapp, NULL);
+ while (spte) {
+ if (*spte & PT_WRITABLE_MASK)
+ printk(KERN_ERR "%s: (%s) shadow page has "
+ "writable mappings: gfn %lx role %x\n",
__func__, audit_msg, sp->gfn,
sp->role.word);
+ spte = rmap_next(vcpu->kvm, rmapp, spte);
+ }
}
}
audit_rmap(vcpu);
audit_write_protection(vcpu);
audit_mappings(vcpu);
+ audit_writable_sptes_have_rmaps(vcpu);
dbg = olddbg;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff