[libvirt-users] problem with disk virtio driver

Andrei Perietanu andrei.perietanu at klastelecom.com
Thu Oct 13 12:47:08 UTC 2016

Hi all,
   I have to admit Martin might have been right: I upgraded to qemu 2.6.0
and still I see the same problem with virtio disks on my custom built Linux

I create domain using the previously mentioned domain xml definition and
try to install ubuntu from an iso. Earty on during the installation I get
an error:
The attempt to mount a file system with type ext4 in Virtual disk1,
partition#1 (vda1) at / failed
At this point the installation fails and I have to reboot the domain.

There obviously is something I'm missing since the same works on a ubuntu
host machine but I have no idea what or how to debug it.

Any help is greatly appreciated.


On Wed, Oct 5, 2016 at 5:07 PM, Andrei Perietanu <
andrei.perietanu at klastelecom.com> wrote:

> On Wed, Oct 5, 2016 at 4:18 PM, Martin Kletzander <mkletzan at redhat.com>
> wrote:
>> On Wed, Oct 05, 2016 at 03:00:40PM +0100, Andrei Perietanu wrote:
>>> Hi Andrea,
>>>   Thanks for the reply;
>>>   To shed some more light on the matter I performed a few more tests;
>>> each
>>> time doing a clean install. I installed ubuntu14.04 as the guest OS,
>>> keeping everything else the same.
>>> On my custom Linux I've created ubuntu VMs before (using ide drivers) and
>>> it all works file. This time I created the VM using virtio disk drivers
>>> and
>> So switching only the guest OS (keeping the host OS, domain XML and
>> everything) works, so how can the problem be anywhere else than the
>> guest OS?  You might be, most probably, missing some kernel option.
>> What is the difference between the installer and the system installed?
>> Are they using the same kernel?  Accessing the same things?
>> the installation didn't even finish. It reported a disk related error
>>> saying it's not being able to read from /dev/vda. I restarted the
>>> machine...same error.
>> You're adding more configurations into the mix, let's skip that and only
>> talk about what you had before, the IDE and ubuntu/your distro.
>>    Just to make sure that I have not messed anything up, I did the same on
>>> the ubuntu host, so installed ubuntu guest on an ubuntu host uding the
>>> same
>>> guest config xml. This time everything worked fine. So it looks like a
>>> problem with the kvm virtio drivers.
>>>    I was trying to stay away from updating the qemu package because
>>> adding
>>> the package takes a long time (usually, because of missing dependencies),
>>> but I'm not sure I have any other option at this point...
>> Are there that many since 1.1.2?  I don't think that much has changed.
>> But it should be solvable without updating (plus the update might not
>> fix it for you.
> Let me try and recap what is happening :
> On my custom embedded linux, using the same domain config xml, just
> changing the disk drivers and/or the iso
>     Ubuntu.iso + ide disk drivers -> works
>     Ubuntu.iso + virio disk drivers -> does not work; errors when reading
> from /dev/vda
>     customLinuxOS.iso + virtio drivers -> does not seem to work; kernel
> panics and services stop working
> On Ubuntu10.04 host, using the same domain config xml as before, just
> changing the iso
>      Ubuntu.iso + virtio disk drivers -> vorks
>      customLinuxOS.iso + virtio drivers -> works
> This sounds to me like a problem with kvm virtio drivers (since when using
> ide drivers installing ubuntu as a guest works)
> If there is anything I'm missing, or you think I should try ..I'm open to
> trying it.
> Thanks,
> Andrei


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