[libvirt-users] problem with disk virtio driver

Andrei Perietanu andrei.perietanu at klastelecom.com
Wed Oct 5 16:07:59 UTC 2016

On Wed, Oct 5, 2016 at 4:18 PM, Martin Kletzander <mkletzan at redhat.com>

> 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.



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