Re: [PATCH x86 kvm] Fix register corruption in pvclock_scale_delta

From: Avi Kivity
Date: Wed Jun 22 2011 - 05:40:53 EST

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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