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Commit 0b975a3c authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: Avoid infinite-frequency local apic timer 



If the local apic initial count is zero, don't start a an hrtimer with infinite
frequency, locking up the host.

Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent 24993d53

arch/x86/kvm/lapic.c

+4 −0
Original line number Diff line number Diff line
@@ -647,6 +647,10 @@ static void start_apic_timer(struct kvm_lapic *apic) 
	apic->timer.period = apic_get_reg(apic, APIC_TMICT) *

		    APIC_BUS_CYCLE_NS * apic->timer.divide_count;

	atomic_set(&apic->timer.pending, 0);



	if (!apic->timer.period)

		return;



	hrtimer_start(&apic->timer.dev,

		      ktime_add_ns(now, apic->timer.period),

		      HRTIMER_MODE_ABS);