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Date: Mon, 20 Sep 2010 19:46:41 +0200
From: "Michael S. Tsirkin" <mst@redhat.com>
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Subject: [Qemu-devel] Re: Re: Problem with virtio
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To: Frans de Boer <frans@fransdb.nl>
Cc: qemu-devel@nongnu.org

On Sun, Sep 19, 2010 at 11:13:16PM +0200, Frans de Boer wrote:
> On 09/19/2010 05:53 PM, Michael S. Tsirkin wrote:
> 
>     On Sat, Sep 18, 2010 at 11:13:12PM +0200, Frans de Boer wrote:
> 
> 
>         On 09/17/2010 10:10 AM, Frans de Boer wrote:
> 
> 
>             On 09/17/2010 01:40 AM, Luiz Capitulino wrote:
> 
> 
> 
>                 On Thu, 16 Sep 2010 23:49:51 +0200
>                 Frans de Boer <frans@fransdb.nl> wrote:
> 
> 
> 
> 
> 
>                     Dear reader,
> 
>                     Using qemu-kvm-0.13-rc1 and having the boot partition as if=virtio,
>                     causes the attached blue screen when booting Windows XP SP3.
>                     Changing the interface to ide (if=ide) and the system boots normal.
> 
> 
> 
> 
>                 Do you have the virtio drivers installed?
> 
> 
> 
> 
>             Yes, everything is working fine when I use the 0.12.5 release.
>             Before you ask, I am using the git repository too. Same effect.
> 
> 
> 
> 
>         No suggestions form anyone?
>         Again, any compile combination is working under 0.12.5. Starting with
>         0.13-rc0/1 the virtio option for the boot disk is not working anymore.
> 
>         Frans.
> 
> 
>     Could you try bisecting please?
>     git bisect start v0.13.0-rc0 v0.12.0
> 
>     will start the bisect process, then you build, test and run
>     git bisect good/git bisect bad as appropriate to get the
>     new version.
> 
> 
> 
> Following your advice, I noticed that the system could not boot when I use the
> guest virtio driver. I then switch back to as far as  version 10.0 with the
> same bad result. I then remembered that in the past I used the '.raw' format.
> Since I am using the qcow2 format (better performance), I never tried if=virtio
> for the disk before until I use the 0.13.0-rc1 version. I tried the release tar
> file of 0.12.5 and this time with the guest virtio driver, with the same bad
> result.
> Maybe it is the file format? Maybe the virtio disk driver? I have taken the
> virtio drivers from the KVM website.
> 
> Frans.

I got confused, sorry. Let's try to enumerate what works and what does not.
Could you tell us which of the following combinations you tried
and with what result (works/doesn't)?

- virtio + raw + 0.12
- virtio + qcow2 + 0.12
- ide + qcow2 + 0.12

- virtio + raw + 0.13
- virtio + qcow2 + 0.13
- ide + qcow2 + 0.13

Thanks!