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Commit 35ee9e48 authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: lapic: reorganize start_hv_timer 



There are many cases in which the hv timer must be canceled.  Split out
a new function to avoid duplication.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 3195a35b

arch/x86/kvm/lapic.c

+27 −13
Original line number Diff line number Diff line
@@ -1501,24 +1501,38 @@ static void cancel_hv_timer(struct kvm_lapic *apic) 
	preempt_enable();

}



static bool start_hv_timer(struct kvm_lapic *apic)

static bool __start_hv_timer(struct kvm_lapic *apic)

{

	u64 tscdeadline = apic->lapic_timer.tscdeadline;

	struct kvm_timer *ktimer = &apic->lapic_timer;

	int r;



	if ((atomic_read(&apic->lapic_timer.pending) &&

		!apic_lvtt_period(apic)) ||

		kvm_x86_ops->set_hv_timer(apic->vcpu, tscdeadline)) {

		if (apic->lapic_timer.hv_timer_in_use)

			cancel_hv_timer(apic);

	} else {

		apic->lapic_timer.hv_timer_in_use = true;

		hrtimer_cancel(&apic->lapic_timer.timer);

	if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending))

		return false;



	r = kvm_x86_ops->set_hv_timer(apic->vcpu, ktimer->tscdeadline);

	if (r < 0)

		return false;



	ktimer->hv_timer_in_use = true;

	hrtimer_cancel(&ktimer->timer);



		/* In case the sw timer triggered in the window */

		if (atomic_read(&apic->lapic_timer.pending) &&

			!apic_lvtt_period(apic))

	/*

	 * Also recheck ktimer->pending, in case the sw timer triggered in

	 * the window.  For periodic timer, leave the hv timer running for

	 * simplicity, and the deadline will be recomputed on the next vmexit.

	 */

	if (!apic_lvtt_period(apic) && atomic_read(&ktimer->pending))

		return false;

	return true;

}



static bool start_hv_timer(struct kvm_lapic *apic)

{

	if (!__start_hv_timer(apic)) {

		if (apic->lapic_timer.hv_timer_in_use)

			cancel_hv_timer(apic);

	}



	trace_kvm_hv_timer_state(apic->vcpu->vcpu_id,

			apic->lapic_timer.hv_timer_in_use);

	return apic->lapic_timer.hv_timer_in_use;