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KVM: fix LAPIC timer period overflow

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Don't overflow when computing the 64-bit period from 32-bit registers.

Fixes sourceforge bug #2826486.

Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>
Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Aurelien Jarno 2009-09-25 11:09:37 +02:00 committed by Avi Kivity
parent 8feda6f786
commit b2d83cfa3f
1 changed files with 1 additions and 1 deletions
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arch/x86/kvm/lapic.c
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@ -664,7 +664,7 @@ static void start_apic_timer(struct kvm_lapic *apic)
{ {
ktime_t now = apic->lapic_timer.timer.base->get_time(); ktime_t now = apic->lapic_timer.timer.base->get_time();
apic->lapic_timer.period = apic_get_reg(apic, APIC_TMICT) * apic->lapic_timer.period = (u64)apic_get_reg(apic, APIC_TMICT) *
APIC_BUS_CYCLE_NS * apic->divide_count; APIC_BUS_CYCLE_NS * apic->divide_count;
atomic_set(&apic->lapic_timer.pending, 0); atomic_set(&apic->lapic_timer.pending, 0);