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KVM: migrate PIT timer

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Migrate the PIT timer to the physical CPU which vcpu0 is scheduled on,
similarly to what is done for the LAPIC timers, otherwise PIT interrupts
will be delayed until an unrelated event causes an exit.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Marcelo Tosatti
2008-05-27 12:10:20 -03:00
committed by Avi Kivity
parent 9dcb40e1aa
commit 2f5997140f
7 changed files with 25 additions and 5 deletions
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14
arch/x86/kvm/i8254.c
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@ -200,7 +200,6 @@ int __pit_timer_fn(struct kvm_kpit_state *ps)
atomic_inc(&pt->pending);
smp_mb__after_atomic_inc();
/* FIXME: handle case where the guest is in guest mode */
if (vcpu0 && waitqueue_active(&vcpu0->wq)) {
vcpu0->arch.mp_state = KVM_MP_STATE_RUNNABLE;
wake_up_interruptible(&vcpu0->wq);
@ -237,6 +236,19 @@ static enum hrtimer_restart pit_timer_fn(struct hrtimer *data)
return HRTIMER_NORESTART;
}
void __kvm_migrate_pit_timer(struct kvm_vcpu *vcpu)
{
struct kvm_pit *pit = vcpu->kvm->arch.vpit;
struct hrtimer *timer;
if (vcpu->vcpu_id != 0 || !pit)
return;
timer = &pit->pit_state.pit_timer.timer;
if (hrtimer_cancel(timer))
hrtimer_start(timer, timer->expires, HRTIMER_MODE_ABS);
}
static void destroy_pit_timer(struct kvm_kpit_timer *pt)
{
pr_debug("pit: execute del timer!\n");