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Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
-rw-r--r--arch/x86/kvm/paging_tmpl.h141
1 files changed, 74 insertions, 67 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index 67785f63539..d2fec9c12d2 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -27,7 +27,8 @@
#define guest_walker guest_walker64
#define FNAME(name) paging##64_##name
#define PT_BASE_ADDR_MASK PT64_BASE_ADDR_MASK
- #define PT_DIR_BASE_ADDR_MASK PT64_DIR_BASE_ADDR_MASK
+ #define PT_LVL_ADDR_MASK(lvl) PT64_LVL_ADDR_MASK(lvl)
+ #define PT_LVL_OFFSET_MASK(lvl) PT64_LVL_OFFSET_MASK(lvl)
#define PT_INDEX(addr, level) PT64_INDEX(addr, level)
#define PT_LEVEL_MASK(level) PT64_LEVEL_MASK(level)
#define PT_LEVEL_BITS PT64_LEVEL_BITS
@@ -43,7 +44,8 @@
#define guest_walker guest_walker32
#define FNAME(name) paging##32_##name
#define PT_BASE_ADDR_MASK PT32_BASE_ADDR_MASK
- #define PT_DIR_BASE_ADDR_MASK PT32_DIR_BASE_ADDR_MASK
+ #define PT_LVL_ADDR_MASK(lvl) PT32_LVL_ADDR_MASK(lvl)
+ #define PT_LVL_OFFSET_MASK(lvl) PT32_LVL_OFFSET_MASK(lvl)
#define PT_INDEX(addr, level) PT32_INDEX(addr, level)
#define PT_LEVEL_MASK(level) PT32_LEVEL_MASK(level)
#define PT_LEVEL_BITS PT32_LEVEL_BITS
@@ -53,8 +55,8 @@
#error Invalid PTTYPE value
#endif
-#define gpte_to_gfn FNAME(gpte_to_gfn)
-#define gpte_to_gfn_pde FNAME(gpte_to_gfn_pde)
+#define gpte_to_gfn_lvl FNAME(gpte_to_gfn_lvl)
+#define gpte_to_gfn(pte) gpte_to_gfn_lvl((pte), PT_PAGE_TABLE_LEVEL)
/*
* The guest_walker structure emulates the behavior of the hardware page
@@ -71,14 +73,9 @@ struct guest_walker {
u32 error_code;
};
-static gfn_t gpte_to_gfn(pt_element_t gpte)
+static gfn_t gpte_to_gfn_lvl(pt_element_t gpte, int lvl)
{
- return (gpte & PT_BASE_ADDR_MASK) >> PAGE_SHIFT;
-}
-
-static gfn_t gpte_to_gfn_pde(pt_element_t gpte)
-{
- return (gpte & PT_DIR_BASE_ADDR_MASK) >> PAGE_SHIFT;
+ return (gpte & PT_LVL_ADDR_MASK(lvl)) >> PAGE_SHIFT;
}
static bool FNAME(cmpxchg_gpte)(struct kvm *kvm,
@@ -125,14 +122,16 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
gpa_t pte_gpa;
int rsvd_fault = 0;
- pgprintk("%s: addr %lx\n", __func__, addr);
+ trace_kvm_mmu_pagetable_walk(addr, write_fault, user_fault,
+ fetch_fault);
walk:
walker->level = vcpu->arch.mmu.root_level;
pte = vcpu->arch.cr3;
#if PTTYPE == 64
if (!is_long_mode(vcpu)) {
- pte = vcpu->arch.pdptrs[(addr >> 30) & 3];
- if (!is_present_pte(pte))
+ pte = kvm_pdptr_read(vcpu, (addr >> 30) & 3);
+ trace_kvm_mmu_paging_element(pte, walker->level);
+ if (!is_present_gpte(pte))
goto not_present;
--walker->level;
}
@@ -150,12 +149,11 @@ walk:
pte_gpa += index * sizeof(pt_element_t);
walker->table_gfn[walker->level - 1] = table_gfn;
walker->pte_gpa[walker->level - 1] = pte_gpa;
- pgprintk("%s: table_gfn[%d] %lx\n", __func__,
- walker->level - 1, table_gfn);
kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte));
+ trace_kvm_mmu_paging_element(pte, walker->level);
- if (!is_present_pte(pte))
+ if (!is_present_gpte(pte))
goto not_present;
rsvd_fault = is_rsvd_bits_set(vcpu, pte, walker->level);
@@ -175,6 +173,8 @@ walk:
#endif
if (!(pte & PT_ACCESSED_MASK)) {
+ trace_kvm_mmu_set_accessed_bit(table_gfn, index,
+ sizeof(pte));
mark_page_dirty(vcpu->kvm, table_gfn);
if (FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn,
index, pte, pte|PT_ACCESSED_MASK))
@@ -186,18 +186,24 @@ walk:
walker->ptes[walker->level - 1] = pte;
- if (walker->level == PT_PAGE_TABLE_LEVEL) {
- walker->gfn = gpte_to_gfn(pte);
- break;
- }
-
- if (walker->level == PT_DIRECTORY_LEVEL
- && (pte & PT_PAGE_SIZE_MASK)
- && (PTTYPE == 64 || is_pse(vcpu))) {
- walker->gfn = gpte_to_gfn_pde(pte);
- walker->gfn += PT_INDEX(addr, PT_PAGE_TABLE_LEVEL);
- if (PTTYPE == 32 && is_cpuid_PSE36())
+ if ((walker->level == PT_PAGE_TABLE_LEVEL) ||
+ ((walker->level == PT_DIRECTORY_LEVEL) &&
+ (pte & PT_PAGE_SIZE_MASK) &&
+ (PTTYPE == 64 || is_pse(vcpu))) ||
+ ((walker->level == PT_PDPE_LEVEL) &&
+ (pte & PT_PAGE_SIZE_MASK) &&
+ is_long_mode(vcpu))) {
+ int lvl = walker->level;
+
+ walker->gfn = gpte_to_gfn_lvl(pte, lvl);
+ walker->gfn += (addr & PT_LVL_OFFSET_MASK(lvl))
+ >> PAGE_SHIFT;
+
+ if (PTTYPE == 32 &&
+ walker->level == PT_DIRECTORY_LEVEL &&
+ is_cpuid_PSE36())
walker->gfn += pse36_gfn_delta(pte);
+
break;
}
@@ -205,9 +211,10 @@ walk:
--walker->level;
}
- if (write_fault && !is_dirty_pte(pte)) {
+ if (write_fault && !is_dirty_gpte(pte)) {
bool ret;
+ trace_kvm_mmu_set_dirty_bit(table_gfn, index, sizeof(pte));
mark_page_dirty(vcpu->kvm, table_gfn);
ret = FNAME(cmpxchg_gpte)(vcpu->kvm, table_gfn, index, pte,
pte|PT_DIRTY_MASK);
@@ -239,6 +246,7 @@ err:
walker->error_code |= PFERR_FETCH_MASK;
if (rsvd_fault)
walker->error_code |= PFERR_RSVD_MASK;
+ trace_kvm_mmu_walker_error(walker->error_code);
return 0;
}
@@ -248,12 +256,11 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
pt_element_t gpte;
unsigned pte_access;
pfn_t pfn;
- int largepage = vcpu->arch.update_pte.largepage;
gpte = *(const pt_element_t *)pte;
if (~gpte & (PT_PRESENT_MASK | PT_ACCESSED_MASK)) {
- if (!is_present_pte(gpte))
- set_shadow_pte(spte, shadow_notrap_nonpresent_pte);
+ if (!is_present_gpte(gpte))
+ __set_spte(spte, shadow_notrap_nonpresent_pte);
return;
}
pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
@@ -267,7 +274,7 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
return;
kvm_get_pfn(pfn);
mmu_set_spte(vcpu, spte, page->role.access, pte_access, 0, 0,
- gpte & PT_DIRTY_MASK, NULL, largepage,
+ gpte & PT_DIRTY_MASK, NULL, PT_PAGE_TABLE_LEVEL,
gpte_to_gfn(gpte), pfn, true);
}
@@ -276,7 +283,7 @@ static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
*/
static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
struct guest_walker *gw,
- int user_fault, int write_fault, int largepage,
+ int user_fault, int write_fault, int hlevel,
int *ptwrite, pfn_t pfn)
{
unsigned access = gw->pt_access;
@@ -289,19 +296,18 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
pt_element_t curr_pte;
struct kvm_shadow_walk_iterator iterator;
- if (!is_present_pte(gw->ptes[gw->level - 1]))
+ if (!is_present_gpte(gw->ptes[gw->level - 1]))
return NULL;
for_each_shadow_entry(vcpu, addr, iterator) {
level = iterator.level;
sptep = iterator.sptep;
- if (level == PT_PAGE_TABLE_LEVEL
- || (largepage && level == PT_DIRECTORY_LEVEL)) {
+ if (iterator.level == hlevel) {
mmu_set_spte(vcpu, sptep, access,
gw->pte_access & access,
user_fault, write_fault,
gw->ptes[gw->level-1] & PT_DIRTY_MASK,
- ptwrite, largepage,
+ ptwrite, level,
gw->gfn, pfn, false);
break;
}
@@ -311,16 +317,19 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
if (is_large_pte(*sptep)) {
rmap_remove(vcpu->kvm, sptep);
- set_shadow_pte(sptep, shadow_trap_nonpresent_pte);
+ __set_spte(sptep, shadow_trap_nonpresent_pte);
kvm_flush_remote_tlbs(vcpu->kvm);
}
- if (level == PT_DIRECTORY_LEVEL
- && gw->level == PT_DIRECTORY_LEVEL) {
+ if (level <= gw->level) {
+ int delta = level - gw->level + 1;
direct = 1;
- if (!is_dirty_pte(gw->ptes[level - 1]))
+ if (!is_dirty_gpte(gw->ptes[level - delta]))
access &= ~ACC_WRITE_MASK;
- table_gfn = gpte_to_gfn(gw->ptes[level - 1]);
+ table_gfn = gpte_to_gfn(gw->ptes[level - delta]);
+ /* advance table_gfn when emulating 1gb pages with 4k */
+ if (delta == 0)
+ table_gfn += PT_INDEX(addr, level);
} else {
direct = 0;
table_gfn = gw->table_gfn[level - 2];
@@ -369,11 +378,11 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
int user_fault = error_code & PFERR_USER_MASK;
int fetch_fault = error_code & PFERR_FETCH_MASK;
struct guest_walker walker;
- u64 *shadow_pte;
+ u64 *sptep;
int write_pt = 0;
int r;
pfn_t pfn;
- int largepage = 0;
+ int level = PT_PAGE_TABLE_LEVEL;
unsigned long mmu_seq;
pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
@@ -399,14 +408,11 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
return 0;
}
- if (walker.level == PT_DIRECTORY_LEVEL) {
- gfn_t large_gfn;
- large_gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE-1);
- if (is_largepage_backed(vcpu, large_gfn)) {
- walker.gfn = large_gfn;
- largepage = 1;
- }
+ if (walker.level >= PT_DIRECTORY_LEVEL) {
+ level = min(walker.level, mapping_level(vcpu, walker.gfn));
+ walker.gfn = walker.gfn & ~(KVM_PAGES_PER_HPAGE(level) - 1);
}
+
mmu_seq = vcpu->kvm->mmu_notifier_seq;
smp_rmb();
pfn = gfn_to_pfn(vcpu->kvm, walker.gfn);
@@ -422,11 +428,10 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
if (mmu_notifier_retry(vcpu, mmu_seq))
goto out_unlock;
kvm_mmu_free_some_pages(vcpu);
- shadow_pte = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
- largepage, &write_pt, pfn);
-
+ sptep = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
+ level, &write_pt, pfn);
pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __func__,
- shadow_pte, *shadow_pte, write_pt);
+ sptep, *sptep, write_pt);
if (!write_pt)
vcpu->arch.last_pt_write_count = 0; /* reset fork detector */
@@ -459,8 +464,9 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
sptep = iterator.sptep;
/* FIXME: properly handle invlpg on large guest pages */
- if (level == PT_PAGE_TABLE_LEVEL ||
- ((level == PT_DIRECTORY_LEVEL) && is_large_pte(*sptep))) {
+ if (level == PT_PAGE_TABLE_LEVEL ||
+ ((level == PT_DIRECTORY_LEVEL && is_large_pte(*sptep))) ||
+ ((level == PT_PDPE_LEVEL && is_large_pte(*sptep)))) {
struct kvm_mmu_page *sp = page_header(__pa(sptep));
pte_gpa = (sp->gfn << PAGE_SHIFT);
@@ -472,7 +478,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
--vcpu->kvm->stat.lpages;
need_flush = 1;
}
- set_shadow_pte(sptep, shadow_trap_nonpresent_pte);
+ __set_spte(sptep, shadow_trap_nonpresent_pte);
break;
}
@@ -489,7 +495,7 @@ static void FNAME(invlpg)(struct kvm_vcpu *vcpu, gva_t gva)
if (kvm_read_guest_atomic(vcpu->kvm, pte_gpa, &gpte,
sizeof(pt_element_t)))
return;
- if (is_present_pte(gpte) && (gpte & PT_ACCESSED_MASK)) {
+ if (is_present_gpte(gpte) && (gpte & PT_ACCESSED_MASK)) {
if (mmu_topup_memory_caches(vcpu))
return;
kvm_mmu_pte_write(vcpu, pte_gpa, (const u8 *)&gpte,
@@ -536,7 +542,7 @@ static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu,
r = kvm_read_guest_atomic(vcpu->kvm, pte_gpa, pt, sizeof pt);
pte_gpa += ARRAY_SIZE(pt) * sizeof(pt_element_t);
for (j = 0; j < ARRAY_SIZE(pt); ++j)
- if (r || is_present_pte(pt[j]))
+ if (r || is_present_gpte(pt[j]))
sp->spt[i+j] = shadow_trap_nonpresent_pte;
else
sp->spt[i+j] = shadow_notrap_nonpresent_pte;
@@ -574,23 +580,23 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
sizeof(pt_element_t)))
return -EINVAL;
- if (gpte_to_gfn(gpte) != gfn || !is_present_pte(gpte) ||
+ if (gpte_to_gfn(gpte) != gfn || !is_present_gpte(gpte) ||
!(gpte & PT_ACCESSED_MASK)) {
u64 nonpresent;
rmap_remove(vcpu->kvm, &sp->spt[i]);
- if (is_present_pte(gpte))
+ if (is_present_gpte(gpte))
nonpresent = shadow_trap_nonpresent_pte;
else
nonpresent = shadow_notrap_nonpresent_pte;
- set_shadow_pte(&sp->spt[i], nonpresent);
+ __set_spte(&sp->spt[i], nonpresent);
continue;
}
nr_present++;
pte_access = sp->role.access & FNAME(gpte_access)(vcpu, gpte);
set_spte(vcpu, &sp->spt[i], pte_access, 0, 0,
- is_dirty_pte(gpte), 0, gfn,
+ is_dirty_gpte(gpte), PT_PAGE_TABLE_LEVEL, gfn,
spte_to_pfn(sp->spt[i]), true, false);
}
@@ -603,9 +609,10 @@ static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
#undef PT_BASE_ADDR_MASK
#undef PT_INDEX
#undef PT_LEVEL_MASK
-#undef PT_DIR_BASE_ADDR_MASK
+#undef PT_LVL_ADDR_MASK
+#undef PT_LVL_OFFSET_MASK
#undef PT_LEVEL_BITS
#undef PT_MAX_FULL_LEVELS
#undef gpte_to_gfn
-#undef gpte_to_gfn_pde
+#undef gpte_to_gfn_lvl
#undef CMPXCHG