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Date: Thu, 5 Jan 2012 11:37:26 +0000
From: "Daniel P. Berrange" <berrange@redhat.com>
Message-ID: <20120105113726.GI31797@redhat.com>
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Subject: Re: [Qemu-devel] vhost broken?
Reply-To: "Daniel P. Berrange" <berrange@redhat.com>
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To: Avi Kivity <avi@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>, Gerd Hoffmann <kraxel@redhat.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>

On Thu, Jan 05, 2012 at 01:16:22PM +0200, Avi Kivity wrote:
> On 01/05/2012 01:05 PM, Gerd Hoffmann wrote:
> >   Hi,
> >
> > current master seems to corrupt guest memory, I get guest errors like
> > this one:
> >
> > swap_dup: Bad swap file entry 1999800080
> > BUG: Bad page map in process udevd  pte:bec5f30054520100 pmd:1f6f4067
> > addr:00007fc464a02000 vm_flags:00100073 anon_vma:ffff88001f928ec0
> > mapping:(null) index:7fc464a02
> > Pid: 555, comm: udevd Not tainted 2.6.32-220.el6.x86_64 #1
> >
> > bisecting points to this commit:
> >
> > commit 04097f7c5957273c578f72b9bd603ba6b1d69e33
> > Author: Avi Kivity <avi@redhat.com>
> > Date:   Sun Dec 18 14:06:05 2011 +0200
> >
> >     vhost: convert to MemoryListener API
> >
> 
> Very likely.  Michael, can you help?
> 
> I don't have a vhost setup, can you share your command line?

All you need to do is take your existing -netdev command line,
and add in the parameter:

  vhost=on

Libvirt does some extra stuff like passing down a pre-opened vhost
file descriptor, but you can ignore that for just testing the core
functionality.

Regards,
Daniel
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