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From: Aurelien Jarno <aurelien@aurel32.net>
To: kvm@vger.kernel.org
Subject: [PATCH] KVM: fix LAPIC timer period overflow
Date: Fri, 25 Sep 2009 11:09:37 +0200	[thread overview]
Message-ID: <20090925090937.GA30138@hall.aurel32.net> (raw)

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>
---
 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 9c8f901..3ca7767 100644
--- a/arch/x86/kvm/lapic.c
+++ b/arch/x86/kvm/lapic.c
@@ -658,7 +658,7 @@ 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);
 
-- 
1.6.4.3

-- 
Aurelien Jarno	                        GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net

             reply	other threads:[~2009-09-25  9:31 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-09-25  9:09 Aurelien Jarno [this message]
2009-09-28 16:33 ` [PATCH] KVM: fix LAPIC timer period overflow Marcelo Tosatti

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