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| author | Vitaly Kuznetsov <vkuznets@redhat.com> | 2020-07-08 16:00:23 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2020-07-09 07:08:37 -0400 |
| commit | 995decb6c43e1d6e9d6a7d590471f2eea74600f4 (patch) | |
| tree | d4eae76f4d0582ab885c3d4c24685a0a59f60938 | |
| parent | 5668821aefcbd8511740301de8bc9153c103a43a (diff) | |
| download | linux-995decb6c43e1d6e9d6a7d590471f2eea74600f4.tar.gz linux-995decb6c43e1d6e9d6a7d590471f2eea74600f4.tar.bz2 linux-995decb6c43e1d6e9d6a7d590471f2eea74600f4.zip | |
KVM: x86: take as_id into account when checking PGD
OVMF booted guest running on shadow pages crashes on TRIPLE FAULT after
enabling paging from SMM. The crash is triggered from mmu_check_root() and
is caused by kvm_is_visible_gfn() searching through memslots with as_id = 0
while vCPU may be in a different context (address space).
Introduce kvm_vcpu_is_visible_gfn() and use it from mmu_check_root().
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20200708140023.1476020-1-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/mmu/mmu.c | 2 | ||||
| -rw-r--r-- | include/linux/kvm_host.h | 1 | ||||
| -rw-r--r-- | virt/kvm/kvm_main.c | 8 |
3 files changed, 10 insertions, 1 deletions
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c index 0011b2c97f65..231beb6d9cf7 100644 --- a/arch/x86/kvm/mmu/mmu.c +++ b/arch/x86/kvm/mmu/mmu.c @@ -3693,7 +3693,7 @@ 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)) { + if (!kvm_vcpu_is_visible_gfn(vcpu, root_gfn)) { kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu); ret = 1; } diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index 9edc6fc71a89..87140e79648b 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -774,6 +774,7 @@ int kvm_clear_guest_page(struct kvm *kvm, gfn_t gfn, int offset, int len); int kvm_clear_guest(struct kvm *kvm, gpa_t gpa, unsigned long len); struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn); bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn); +bool kvm_vcpu_is_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn); unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn); void mark_page_dirty(struct kvm *kvm, gfn_t gfn); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 0a68c9d3d3ab..b528a59b0a84 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -1626,6 +1626,14 @@ bool kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn) } EXPORT_SYMBOL_GPL(kvm_is_visible_gfn); +bool kvm_vcpu_is_visible_gfn(struct kvm_vcpu *vcpu, gfn_t gfn) +{ + struct kvm_memory_slot *memslot = kvm_vcpu_gfn_to_memslot(vcpu, gfn); + + return kvm_is_visible_memslot(memslot); +} +EXPORT_SYMBOL_GPL(kvm_vcpu_is_visible_gfn); + unsigned long kvm_host_page_size(struct kvm_vcpu *vcpu, gfn_t gfn) { struct vm_area_struct *vma; |