Check for an unblocked SMI in vmx_check_nested_events() so that pending
SMIs are correctly prioritized over IRQs and NMIs when the latter events
will trigger VM-Exit. This also fixes an issue where an SMI that was
marked pending while processing a nested VM-Enter wouldn't trigger an
immediate exit, i.e. would be incorrectly delayed until L2 happened to
take a VM-Exit.
Fixes: 64d6067057d96 ("KVM: x86: stubs for SMM support")
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
---
arch/x86/kvm/vmx/nested.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 1fdaca5fd93d..8c16b190816b 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -3750,6 +3750,12 @@ static int vmx_check_nested_events(struct kvm_vcpu *vcpu)
return 0;
}
+ if (vcpu->arch.smi_pending && !is_smm(vcpu)) {
+ if (block_nested_events)
+ return -EBUSY;
+ goto no_vmexit;
+ }
+
if (vcpu->arch.nmi_pending && !vmx_nmi_blocked(vcpu)) {
if (block_nested_events)
return -EBUSY;
--
2.26.0
