KVM: VMX: Fix pending NMI-vs.-IRQ race for user space irqchip
As with the kernel irqchip, don't allow an NMI to stomp over an already
injected IRQ; instead wait for the IRQ injection to be completed.
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e446f23..487e1dc 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -2486,7 +2486,9 @@
vmx_update_window_states(vcpu);
if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
- if (vcpu->arch.nmi_window_open) {
+ if (vcpu->arch.interrupt.pending) {
+ enable_nmi_window(vcpu);
+ } else if (vcpu->arch.nmi_window_open) {
vcpu->arch.nmi_pending = false;
vcpu->arch.nmi_injected = true;
} else {