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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: Avi Kivity <avi@qumranet.com>
hifive-unleashed-5.1
Avi Kivity 2008-02-24 14:37:50 +02:00
parent 24993d5349
commit 0b975a3c2d
1 changed files with 4 additions and 0 deletions
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4
arch/x86/kvm/lapic.c
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@ -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);