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Commit b2d83cfa authored by Aurelien Jarno's avatar Aurelien Jarno Committed by Avi Kivity
Browse files

KVM: fix LAPIC timer period overflow 



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

Fixes sourceforge bug #2826486.

Signed-off-by: default avatarAurelien Jarno <aurelien@aurel32.net>
Cc: stable@kernel.org
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 8feda6f7

arch/x86/kvm/lapic.c

+1 −1
Original line number Diff line number Diff line
@@ -664,7 +664,7 @@ static void start_apic_timer(struct kvm_lapic *apic) 
{

	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;

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