KVM: VMX: Fix check for valid GVA on an EPT violation

On an EPT violation, bit 7 of the exit qualification is set if the
guest linear-address is valid. The derived page fault error code
should not be checked for this bit.

Fixes: f300948 ("KVM: VMX: Set PFERR_GUEST_{FINAL,PAGE}_MASK if and only if the GVA is valid")
Cc: [email protected]
Signed-off-by: Sukrit Bhatnagar <[email protected]>
Reviewed-by: Xiaoyao Li <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Sean Christopherson <[email protected]>

Author: Sukrit Bhatnagar

arch/x86/kvm/vmx/common.h

@@ -98,7 +98,7 @@ static inline int __vmx_handle_ept_violation(struct kvm_vcpu *vcpu, gpa_t gpa,
 	error_code |= (exit_qualification & EPT_VIOLATION_PROT_MASK)
 		      ? PFERR_PRESENT_MASK : 0;
 
-	if (error_code & EPT_VIOLATION_GVA_IS_VALID)
+	if (exit_qualification & EPT_VIOLATION_GVA_IS_VALID)
 		error_code |= (exit_qualification & EPT_VIOLATION_GVA_TRANSLATED) ?
 			      PFERR_GUEST_FINAL_MASK : PFERR_GUEST_PAGE_MASK;