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| author | Avi Kivity <avi@qumranet.com> | 2007-01-06 01:36:51 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.osdl.org> | 2007-01-06 08:55:26 +0100 |
| commit | 3bb65a22a4502067f8cd3cb4c923ffa70be62091 (patch) | |
| tree | b8ee904c9a4b99f0c8f58e93b257f653222e3ba0 /drivers/kvm/mmu.c | |
| parent | [PATCH] KVM: MMU: Page table write flood protection (diff) | |
| download | linux-3bb65a22a4502067f8cd3cb4c923ffa70be62091.tar.xz linux-3bb65a22a4502067f8cd3cb4c923ffa70be62091.zip | |
[PATCH] KVM: MMU: Never free a shadow page actively serving as a root
We always need cr3 to point to something valid, so if we detect that we're
freeing a root page, simply push it back to the top of the active list.
Signed-off-by: Avi Kivity <avi@qumranet.com>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/kvm/mmu.c')
| -rw-r--r-- | drivers/kvm/mmu.c | 20 |
1 files changed, 18 insertions, 2 deletions
diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 0e44aca9eee7..f16321498093 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -550,8 +550,13 @@ static void kvm_mmu_zap_page(struct kvm_vcpu *vcpu, *parent_pte = 0; } kvm_mmu_page_unlink_children(vcpu, page); - hlist_del(&page->hash_link); - kvm_mmu_free_page(vcpu, page->page_hpa); + if (!page->root_count) { + hlist_del(&page->hash_link); + kvm_mmu_free_page(vcpu, page->page_hpa); + } else { + list_del(&page->link); + list_add(&page->link, &vcpu->kvm->active_mmu_pages); + } } static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn) @@ -667,12 +672,15 @@ static int nonpaging_map(struct kvm_vcpu *vcpu, gva_t v, hpa_t p) static void mmu_free_roots(struct kvm_vcpu *vcpu) { int i; + struct kvm_mmu_page *page; #ifdef CONFIG_X86_64 if (vcpu->mmu.shadow_root_level == PT64_ROOT_LEVEL) { hpa_t root = vcpu->mmu.root_hpa; ASSERT(VALID_PAGE(root)); + page = page_header(root); + --page->root_count; vcpu->mmu.root_hpa = INVALID_PAGE; return; } @@ -682,6 +690,8 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu) ASSERT(VALID_PAGE(root)); root &= PT64_BASE_ADDR_MASK; + page = page_header(root); + --page->root_count; vcpu->mmu.pae_root[i] = INVALID_PAGE; } vcpu->mmu.root_hpa = INVALID_PAGE; @@ -691,6 +701,8 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) { int i; gfn_t root_gfn; + struct kvm_mmu_page *page; + root_gfn = vcpu->cr3 >> PAGE_SHIFT; #ifdef CONFIG_X86_64 @@ -700,6 +712,8 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) ASSERT(!VALID_PAGE(root)); root = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, 0, NULL)->page_hpa; + page = page_header(root); + ++page->root_count; vcpu->mmu.root_hpa = root; return; } @@ -715,6 +729,8 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) root = kvm_mmu_get_page(vcpu, root_gfn, i << 30, PT32_ROOT_LEVEL, !is_paging(vcpu), NULL)->page_hpa; + page = page_header(root); + ++page->root_count; vcpu->mmu.pae_root[i] = root | PT_PRESENT_MASK; } vcpu->mmu.root_hpa = __pa(vcpu->mmu.pae_root); |