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| author | Aurelien Jarno <aurelien@aurel32.net> | 2009-09-25 11:09:37 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-12 12:40:18 -0700 |
| commit | ddf2acb72f3df470ce15eb23ee97cd3be23016f8 (patch) | |
| tree | 8ac946ef474d0b5bd6f4b02704fc8e45ad7cbc59 /arch | |
| parent | ca9405b882ae10710c158d989f0c740242af2e28 (diff) | |
| download | lwn-ddf2acb72f3df470ce15eb23ee97cd3be23016f8.tar.gz lwn-ddf2acb72f3df470ce15eb23ee97cd3be23016f8.zip | |
KVM: fix LAPIC timer period overflow
commit b2d83cfa3fdefe5c6573d443d099a18dc3a93c5f upstream.
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>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kvm/lapic.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c index bb6277d5b2c0..b225176b5981 100644 --- a/arch/x86/kvm/lapic.c +++ b/arch/x86/kvm/lapic.c @@ -567,7 +567,7 @@ 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); |