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KVM: VMX: Fix interrupt loss during race with NMI 

If an interrupt cannot be injected for some reason (say, page fault
when fetching the IDT descriptor), the interrupt is marked for
reinjection.  However, if an NMI is queued at this time, the NMI
will be injected instead and the NMI will be lost.

Fix by deferring the NMI injection until the interrupt has been
injected successfully.

Analyzed by Jan Kiszka.

Signed-off-by: Avi Kivity <avi@redhat.com>
hifive-unleashed-5.1
Avi Kivity 2008-11-20 11:47:18 +02:00
parent 3eb77d5116
commit bd2b3ca768
1 changed files with 3 additions and 1 deletions
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4
arch/x86/kvm/vmx.c
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@ -3149,7 +3149,9 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
if (cpu_has_virtual_nmis()) {
if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
if (vmx_nmi_enabled(vcpu)) {
if (vcpu->arch.interrupt.pending) {
enable_nmi_window(vcpu);
} else if (vmx_nmi_enabled(vcpu)) {
vcpu->arch.nmi_pending = false;
vcpu->arch.nmi_injected = true;
} else {