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

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Message-ID: <1308736321.6920.174.camel@zakaz.uk.xensource.com>
Date:	Wed, 22 Jun 2011 10:52:01 +0100
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Avi Kivity <avi@...hat.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 Wed, 2011-06-22 at 10:40 +0100, Avi Kivity wrote:
> 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.

Oops!

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

Good to know, thanks!

Ian.

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