| From: Marcelo Tosatti <mtosatti@redhat.com> |
| Date: Wed, 8 Apr 2015 20:33:25 -0300 |
| Subject: KVM: lapic: mark LAPIC timer handler as irqsafe |
| |
| Since lapic timer handler only wakes up a simple waitqueue, |
| it can be executed from hardirq context. |
| |
| Reduces average cyclictest latency by 3us. |
| |
| Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> |
| Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> |
| --- |
| arch/x86/kvm/lapic.c | 1 + |
| 1 file changed, 1 insertion(+) |
| |
| --- a/arch/x86/kvm/lapic.c |
| +++ b/arch/x86/kvm/lapic.c |
| @@ -1801,6 +1801,7 @@ int kvm_create_lapic(struct kvm_vcpu *vc |
| hrtimer_init(&apic->lapic_timer.timer, CLOCK_MONOTONIC, |
| HRTIMER_MODE_ABS); |
| apic->lapic_timer.timer.function = apic_timer_fn; |
| + apic->lapic_timer.timer.irqsafe = 1; |
| |
| /* |
| * APIC is created enabled. This will prevent kvm_lapic_set_base from |
