Re: [libvirt-users] problem with disk virtio driver

On Wed, Oct 5, 2016 at 4:18 PM, Martin Kletzander <mkletzan(a)redhat.com&gt; 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