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Diffstat (limited to 'arch/x86/kvm/paging_tmpl.h')
-rw-r--r--arch/x86/kvm/paging_tmpl.h86
1 files changed, 49 insertions, 37 deletions
diff --git a/arch/x86/kvm/paging_tmpl.h b/arch/x86/kvm/paging_tmpl.h
index ecc0856..156fe10 100644
--- a/arch/x86/kvm/paging_tmpl.h
+++ b/arch/x86/kvm/paging_tmpl.h
@@ -130,7 +130,7 @@ static int FNAME(walk_addr)(struct guest_walker *walker,
unsigned index, pt_access, pte_access;
gpa_t pte_gpa;
- pgprintk("%s: addr %lx\n", __FUNCTION__, addr);
+ pgprintk("%s: addr %lx\n", __func__, addr);
walk:
walker->level = vcpu->arch.mmu.root_level;
pte = vcpu->arch.cr3;
@@ -155,7 +155,7 @@ 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", __FUNCTION__,
+ pgprintk("%s: table_gfn[%d] %lx\n", __func__,
walker->level - 1, table_gfn);
kvm_read_guest(vcpu->kvm, pte_gpa, &pte, sizeof(pte));
@@ -222,7 +222,7 @@ walk:
walker->pt_access = pt_access;
walker->pte_access = pte_access;
pgprintk("%s: pte %llx pte_access %x pt_access %x\n",
- __FUNCTION__, (u64)pte, pt_access, pte_access);
+ __func__, (u64)pte, pt_access, pte_access);
return 1;
not_present:
@@ -243,31 +243,30 @@ err:
}
static void FNAME(update_pte)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *page,
- u64 *spte, const void *pte, int bytes,
- int offset_in_pte)
+ u64 *spte, const void *pte)
{
pt_element_t gpte;
unsigned pte_access;
- struct page *npage;
+ 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 (!offset_in_pte && !is_present_pte(gpte))
+ if (!is_present_pte(gpte))
set_shadow_pte(spte, shadow_notrap_nonpresent_pte);
return;
}
- if (bytes < sizeof(pt_element_t))
- return;
- pgprintk("%s: gpte %llx spte %p\n", __FUNCTION__, (u64)gpte, spte);
+ pgprintk("%s: gpte %llx spte %p\n", __func__, (u64)gpte, spte);
pte_access = page->role.access & FNAME(gpte_access)(vcpu, gpte);
if (gpte_to_gfn(gpte) != vcpu->arch.update_pte.gfn)
return;
- npage = vcpu->arch.update_pte.page;
- if (!npage)
+ pfn = vcpu->arch.update_pte.pfn;
+ if (is_error_pfn(pfn))
return;
- get_page(npage);
+ kvm_get_pfn(pfn);
mmu_set_spte(vcpu, spte, page->role.access, pte_access, 0, 0,
- gpte & PT_DIRTY_MASK, NULL, gpte_to_gfn(gpte), npage);
+ gpte & PT_DIRTY_MASK, NULL, largepage, gpte_to_gfn(gpte),
+ pfn, true);
}
/*
@@ -275,8 +274,8 @@ 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 *walker,
- int user_fault, int write_fault, int *ptwrite,
- struct page *page)
+ int user_fault, int write_fault, int largepage,
+ int *ptwrite, pfn_t pfn)
{
hpa_t shadow_addr;
int level;
@@ -304,11 +303,19 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
shadow_ent = ((u64 *)__va(shadow_addr)) + index;
if (level == PT_PAGE_TABLE_LEVEL)
break;
- if (is_shadow_present_pte(*shadow_ent)) {
+
+ if (largepage && level == PT_DIRECTORY_LEVEL)
+ break;
+
+ if (is_shadow_present_pte(*shadow_ent)
+ && !is_large_pte(*shadow_ent)) {
shadow_addr = *shadow_ent & PT64_BASE_ADDR_MASK;
continue;
}
+ if (is_large_pte(*shadow_ent))
+ rmap_remove(vcpu->kvm, shadow_ent);
+
if (level - 1 == PT_PAGE_TABLE_LEVEL
&& walker->level == PT_DIRECTORY_LEVEL) {
metaphysical = 1;
@@ -329,7 +336,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
walker->pte_gpa[level - 2],
&curr_pte, sizeof(curr_pte));
if (r || curr_pte != walker->ptes[level - 2]) {
- kvm_release_page_clean(page);
+ kvm_release_pfn_clean(pfn);
return NULL;
}
}
@@ -342,7 +349,7 @@ static u64 *FNAME(fetch)(struct kvm_vcpu *vcpu, gva_t addr,
mmu_set_spte(vcpu, shadow_ent, access, walker->pte_access & access,
user_fault, write_fault,
walker->ptes[walker->level-1] & PT_DIRTY_MASK,
- ptwrite, walker->gfn, page);
+ ptwrite, largepage, walker->gfn, pfn, false);
return shadow_ent;
}
@@ -371,16 +378,16 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
u64 *shadow_pte;
int write_pt = 0;
int r;
- struct page *page;
+ pfn_t pfn;
+ int largepage = 0;
- pgprintk("%s: addr %lx err %x\n", __FUNCTION__, addr, error_code);
+ pgprintk("%s: addr %lx err %x\n", __func__, addr, error_code);
kvm_mmu_audit(vcpu, "pre page fault");
r = mmu_topup_memory_caches(vcpu);
if (r)
return r;
- down_read(&vcpu->kvm->slots_lock);
/*
* Look up the shadow pte for the faulting address.
*/
@@ -391,40 +398,45 @@ static int FNAME(page_fault)(struct kvm_vcpu *vcpu, gva_t addr,
* The page is not mapped by the guest. Let the guest handle it.
*/
if (!r) {
- pgprintk("%s: guest page fault\n", __FUNCTION__);
+ pgprintk("%s: guest page fault\n", __func__);
inject_page_fault(vcpu, addr, walker.error_code);
vcpu->arch.last_pt_write_count = 0; /* reset fork detector */
- up_read(&vcpu->kvm->slots_lock);
return 0;
}
down_read(&current->mm->mmap_sem);
- page = gfn_to_page(vcpu->kvm, walker.gfn);
+ 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;
+ }
+ }
+ pfn = gfn_to_pfn(vcpu->kvm, walker.gfn);
up_read(&current->mm->mmap_sem);
+ /* mmio */
+ if (is_error_pfn(pfn)) {
+ pgprintk("gfn %x is mmio\n", walker.gfn);
+ kvm_release_pfn_clean(pfn);
+ return 1;
+ }
+
spin_lock(&vcpu->kvm->mmu_lock);
kvm_mmu_free_some_pages(vcpu);
shadow_pte = FNAME(fetch)(vcpu, addr, &walker, user_fault, write_fault,
- &write_pt, page);
- pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __FUNCTION__,
+ largepage, &write_pt, pfn);
+
+ pgprintk("%s: shadow pte %p %llx ptwrite %d\n", __func__,
shadow_pte, *shadow_pte, write_pt);
if (!write_pt)
vcpu->arch.last_pt_write_count = 0; /* reset fork detector */
- /*
- * mmio: emulate if accessible, otherwise its a guest fault.
- */
- if (shadow_pte && is_io_pte(*shadow_pte)) {
- spin_unlock(&vcpu->kvm->mmu_lock);
- up_read(&vcpu->kvm->slots_lock);
- return 1;
- }
-
++vcpu->stat.pf_fixed;
kvm_mmu_audit(vcpu, "post page fault (fixed)");
spin_unlock(&vcpu->kvm->mmu_lock);
- up_read(&vcpu->kvm->slots_lock);
return write_pt;
}
generated by cgit v0.10.2 at 2024-08-13 15:53:33 (GMT)