diff options
Diffstat (limited to 'arch/x86/kvm/mmu.c')
| -rw-r--r-- | arch/x86/kvm/mmu.c | 25 |
1 files changed, 22 insertions, 3 deletions
diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 3e5f086eb0f..ca65ef53554 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1350,7 +1350,19 @@ static void mmu_free_roots(struct kvm_vcpu *vcpu) 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; @@ -1365,13 +1377,15 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) ASSERT(!VALID_PAGE(root)); if (tdp_enabled) metaphysical = 1; + if (mmu_check_root(vcpu, root_gfn)) + return 1; sp = kvm_mmu_get_page(vcpu, root_gfn, 0, PT64_ROOT_LEVEL, metaphysical, ACC_ALL, NULL); root = __pa(sp->spt); ++sp->root_count; vcpu->arch.mmu.root_hpa = root; - return; + return 0; } metaphysical = !is_paging(vcpu); if (tdp_enabled) @@ -1388,6 +1402,8 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) root_gfn = vcpu->arch.pdptrs[i] >> 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, ACC_ALL, NULL); @@ -1396,6 +1412,7 @@ static void mmu_alloc_roots(struct kvm_vcpu *vcpu) vcpu->arch.mmu.pae_root[i] = root | PT_PRESENT_MASK; } vcpu->arch.mmu.root_hpa = __pa(vcpu->arch.mmu.pae_root); + return 0; } static gpa_t nonpaging_gva_to_gpa(struct kvm_vcpu *vcpu, gva_t vaddr) @@ -1639,8 +1656,10 @@ int kvm_mmu_load(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); 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: |