linux-kernel - Re: [PATCH x86 kvm] Fix register corruption in pvclock_scale

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Message-ID: <4E01B89C.7050704@redhat.com>
Date:	Wed, 22 Jun 2011 12:40:44 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Ian Campbell <Ian.Campbell@...rix.com>
CC:	Zachary Amsden <zamsden@...hat.com>, kvm <kvm@...r.kernel.org>,
	Linux-kernel <linux-kernel@...r.kernel.org>,
	Ulrich Obergfell <uobergfe@...hat.com>
Subject: Re: [PATCH x86 kvm] Fix register corruption in pvclock_scale_delta

On 06/22/2011 12:35 PM, Ian Campbell wrote:
> On Sun, 2011-06-19 at 15:44 +0300, Avi Kivity wrote:
> >  On 06/16/2011 06:50 AM, Zachary Amsden wrote:
> >  >  The 128-bit multiply in pvclock.h was missing an output constraint for
> >  >  EDX which caused a register corruption to appear.
>
> Was there any particular symptom associated with corruption at that
> particular point or just general badness?
>

Time went backwards and forwards as vcpus were migrated across cpus.

The problem was in the host, not the guest, so Xen should not be affected.

-- 
error compiling committee.c: too many arguments to function

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