[PATCH 12/13] KVM: nSVM: emulate VMEXIT_INVALID case for nested VNMI

Maxim Levitsky
2022-11-17T14:35:58Z

From: Santosh Shukla <santosh.shukla@amd.com>

If NMI virtualization enabled and NMI_INTERCEPT is unset then next vm
entry will exit with #INVALID exit reason.

In order to emulate above (VMEXIT(#INVALID)) scenario for nested
environment, extending check for V_NMI_ENABLE, NMI_INTERCEPT bit in func
__nested_vmcb_check_controls.

Signed-off-by: Santosh Shukla <santosh.shukla@amd.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
---
arch/x86/kvm/svm/nested.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index c9fcdd691bb5a1..3ef7e1971a4709 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -275,6 +275,11 @@ static bool __nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
if (CC(!nested_svm_check_tlb_ctl(vcpu, control->tlb_ctl)))
return false;

+ if (CC((control->int_ctl & V_NMI_ENABLE) &&
+ !vmcb12_is_intercept(control, INTERCEPT_NMI))) {
+ return false;
+ }
+
return true;
}

--
2.34.3