[Qemu-devel] Re: Problem with virtio

[Frans de Boer]

On 09/26/2010 05:30 PM, Michael S. Tsirkin wrote:
> On Tue, Sep 21, 2010 at 01:15:22AM +0200, Frans de Boer wrote:
>   
>> On 09/20/2010 11:19 PM, Vadim Rozenfeld wrote:
>>     
>>> On Mon, 2010-09-20 at 22:22 +0200, Frans de Boer wrote:
>>>   
>>>       
>>>> On 09/20/2010 07:46 PM, Michael S. Tsirkin wrote:
>>>>     
>>>>         
>>>>> 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 <address@hidden> 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.
>>>>>>
>>>>>>         
>>>>>>             
>>> Please try this one 
>>> http://people.redhat.com/vrozenfe/VioStorXp32.tar.gz
>>> Cheers,
>>> Vadim.
>>>   
>>>       
>>>>>> 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!
>>>>>
>>>>>   
>>>>>       
>>>>>           
>>>> I used 0.12.5 (git and tarball) and the 0.13-rc1 (git and tarball)
>>>>
>>>> - virtio + raw + 0.12              ok
>>>> - virtio + qcow2 + 0.12            fail!
>>>> - ide + qcow2 + 0.12               ok
>>>>
>>>> - virtio + raw + 0.13              fail!
>>>> - virtio + qcow2 + 0.13            fail!
>>>> - ide + qcow2 + 0.13               ok
>>>>
>>>> Frans.
>>>>     
>>>>         
>> The new list is:
>>
>> - virtio + raw + 0.13                ok.
>>
>> That is when I am using this viostor driver:
>>   http://alt.fedoraproject.org/pub/alt/virtio-win/latest/images/bin/
>> I used the complete ISO file and extracted the viostor files. These are 6.x 
>> files.
>>
>> .qcow2 with virtio still does not work under 0.13-rc1
>> It's late, so maybe in a few days I try 0.12.5 with the .qcow2 format.
>>     
> OK, so with new drivers all formats behave identically
> under 0.13 and 0.12, right?
>
>   
Yes, a image format in qcow2 is not working under versions 0.12-0.13
while using the latest - or previous - virtio drivers.
The question is now if that is only in my case (and if so what "special"
environment do I have) or are there others having the same issue. Which
points to a design issue in either the qcow2 format or the virtio drivers.