diff options
Diffstat (limited to 'arch/x86/kvm/i8254.c')
| -rw-r--r-- | arch/x86/kvm/i8254.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/x86/kvm/i8254.c b/arch/x86/kvm/i8254.c index 59ebd37ad79e..580cc1d01c7d 100644 --- a/arch/x86/kvm/i8254.c +++ b/arch/x86/kvm/i8254.c @@ -603,10 +603,25 @@ void kvm_free_pit(struct kvm *kvm) static void __inject_pit_timer_intr(struct kvm *kvm) { + struct kvm_vcpu *vcpu; + int i; + mutex_lock(&kvm->lock); kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 1); kvm_set_irq(kvm, kvm->arch.vpit->irq_source_id, 0, 0); mutex_unlock(&kvm->lock); + + /* + * Provides NMI watchdog support in IOAPIC mode. + * The route is: PIT -> PIC -> LVT0 in NMI mode, + * timer IRQs will continue to flow through the IOAPIC. + */ + for (i = 0; i < KVM_MAX_VCPUS; ++i) { + vcpu = kvm->vcpus[i]; + if (!vcpu) + continue; + kvm_apic_local_deliver(vcpu, APIC_LVT0); + } } void kvm_inject_pit_timer_irqs(struct kvm_vcpu *vcpu) |