Commit fca91f6d authored by Jim Mattson's avatar Jim Mattson Committed by Paolo Bonzini
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kvm: nVMX: Set VM instruction error for VMPTRLD of unbacked page

It is never correct for a VMX instruction to fail with "invalid VMCS"
if there is, in fact, a current VMCS. Reads from unbacked addresses
return all 1's, which means that an unbacked VMCS will not have the
correct VMCS revision ID (i.e. VMCS12_REVISION).

Fixes: 63846663

 ("KVM: nVMX: Implement VMPTRLD")
Signed-off-by: default avatarJim Mattson <>
Signed-off-by: default avatarPaolo Bonzini <>
parent 14aa61d0
......@@ -9318,9 +9318,17 @@ static int handle_vmptrld(struct kvm_vcpu *vcpu)
struct vmcs12 *new_vmcs12;
struct page *page;
page = kvm_vcpu_gpa_to_page(vcpu, vmptr);
if (is_error_page(page))
return nested_vmx_failInvalid(vcpu);
if (is_error_page(page)) {
* Reads from an unbacked page return all 1s,
* which means that the 32 bits located at the
* given physical address won't match the required
* VMCS12_REVISION identifier.
return kvm_skip_emulated_instruction(vcpu);
new_vmcs12 = kmap(page);
if (new_vmcs12->hdr.revision_id != VMCS12_REVISION ||
(new_vmcs12->hdr.shadow_vmcs &&
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