KVM: VMX: do not check bit 12 of EPT violation exit qualification when undefined

Bit 12 is undefined in any of the following cases:
- If the "NMI exiting" VM-execution control is 1 and the "virtual NMIs" VM-execution control is 0.
- If the VM exit sets the valid bit in the IDT-vectoring information field

Signed-off-by Gleb Natapov <[email protected]>

arch/x86/kvm/vmx.c +3 -2

index a1216de..0e06c1c4 100644
@@ -5345,7 +5345,9 @@ static int handle_ept_violation(struct kvm_vcpu *vcpu)
 	 * There are errata that may cause this bit to not be set:
 	 * AAK134, BY25.
 	 */
-	if (exit_qualification & INTR_INFO_UNBLOCK_NMI)
+	if (!(to_vmx(vcpu)->idt_vectoring_info & VECTORING_INFO_VALID_MASK) &&
+			cpu_has_virtual_nmis() &&
+			exit_qualification & INTR_INFO_UNBLOCK_NMI)
 		vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO, GUEST_INTR_STATE_NMI);
 
 	gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
--

Gleb.
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