<div dir="ltr"><div class="gmail_extra"><div><div class="gmail_signature"><div dir="ltr"><div class="gmail_extra">Hi Andrea, </div><div class="gmail_extra"> Thanks for the reply; </div><div class="gmail_extra"> 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. </div><div class="gmail_extra">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 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.</div><div class="gmail_extra"> 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.</div><div class="gmail_extra"><br></div><div class="gmail_extra"> 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...</div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra">Andrei</div></div></div></div>
<br><div class="gmail_quote">On Wed, Oct 5, 2016 at 2:45 PM, Andrea Bolognani <span dir="ltr"><<a href="mailto:abologna@redhat.com" target="_blank">abologna@redhat.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div class="gmail-HOEnZb"><div class="gmail-h5">On Wed, 2016-10-05 at 12:13 +0100, Andrei Perietanu wrote:<br>
> I just ran into a problem I can't make heads or tails of,<br>
> so I'm hoping to get some help here.<br>
> <br>
> I have a custom built Embedded Linux running qemu-kvm<br>
> 1.1.2 and libvirt 1.2.20<br>
> <br>
> I'm creating a domain with the following config:<br>
> <br>
> <domain type='kvm'><br>
> <name>myVM</name> <br>
> <memory unit='KiB'>2097152</memory> <br>
> <vcpu placement='static'>2</vcpu> <br>
> <os><br>
> <type arch='x86_64'>hvm</type><br>
> <boot dev='hd'/> <br>
> <boot dev='cdrom'/> <br>
> </os><br>
> <features><br>
> <acpi/><br>
> <apic/><br>
> </features><br>
> <cpu mode='host-model'/><br>
> <clock offset='utc'><br>
> <timer name='rtc' tickpolicy='catchup'/><br>
> <timer name='pit' tickpolicy='delay'/><br>
> <timer name='hpet' present='no'/><br>
> </clock><br>
> <on_poweroff>destroy</on_<wbr>poweroff><br>
> <on_reboot>restart</on_<wbr>reboot><br>
> <on_crash>restart</on_<wbr>crash> <br>
> <devices><br>
> <disk type='file' device='cdrom'><br>
> <driver name='qemu' type='raw'/><br>
> <target dev='hdb' bus='ide'/><br>
> <source file='custom.iso'/><br>
> <readonly/><br>
> <br>
> </disk><br>
> <disk type='file' device='disk'><br>
> <driver name='qemu' type='qcow2'/><br>
> <source file='/path/to/vdisk.img'/><br>
> <target dev='vda' bus='virtio'/> <br>
> </disk><br>
> <controller type='pci' model='pci-root'/><br>
> <controller type='usb'/><br>
> <controller type='ide'/><br>
> <interface type='bridge'><br>
> <source bridge='virbr0'/> <br>
> <model type='virtio'/><br>
> </interface><br>
> <br>
> <serial type='pty'><br>
> <target port='0'/><br>
> </serial><br>
> <console type='pty'><br>
> <target type='serial' port='0'/><br>
> </console><br>
> <input type='tablet' bus='usb'/><br>
> <input type='mouse' bus='ps2'/><br>
> <input type='keyboard' bus='ps2'/><br>
> <graphics type='vnc' port='-1' autoport='yes'/><br>
> <video><br>
> <model type='qxl' ram='65536' vram='65536' vgamem='16384' heads='1'/><br>
> </video><br>
> <watchdog model='i6300esb' action='reset'/><br>
> <memballoon model='none'/> <br>
> </devices><br>
> </domain><br>
<br>
</div></div>There doesn't seem to be anything obviously wrong with your<br>
guest configuration.<br>
<span class="gmail-"><br>
> Granted the OS I'm installing is again a custom Linux with<br>
> some software running on top ..so It's not a well known<br>
> OS...but I'm hoping that does not matter much. <br>
<br>
</span>It shouldn't.<br>
<span class="gmail-"><br>
> After installation I get all sorts of kernel panics and<br>
> errors about services not being able to start. <br>
<br>
</span>Wait, so the OS installer is perfectly happy and runs to<br>
completion, but once you boot the installed OS you get a<br>
bunch of errors?<br>
<br>
That sounds more like a faulty guest OS configuration than<br>
anything wrong with the virtual hardware. It most certainly<br>
doesn't sound like it could be anything disk related,<br>
because if that was the case the installer wouldn't have<br>
been able to access it in the first place.<br>
<br>
"All sorts of kernel panics and errors about services not<br>
being able to start" is *extremely* generic though, you'll<br>
have to be way more specific if you hope to get any help :)<br>
<span class="gmail-"><br>
> So I tried the same thing on ubuntu 14.04.2 LTS which<br>
> installed qemu-kvm 2.0.0 and libvirt 1.2.2<br>
> <br>
> Same config xml, but this time it worked better -I was<br>
> not getting the kernel panics.<br>
<br>
</span>Did you perform a new installation on the Ubuntu host?<br>
Or did you copy the qcow2 image over from the custom<br>
Linux host? Did you try going the other way around, eg.<br>
copy the working guest from the Ubuntu host to the<br>
custom Linux host?<br>
<span class="gmail-"><br>
> The OS I'm installing does not support IDE disks, it<br>
> needs a virtio disk.<br>
<br>
</span>And your guest configuration supplies one, so you should<br>
be all set on that front.<br>
<span class="gmail-"><br>
> The obvious solution here would be to try and get a newer<br>
> version of qemu, but since we're talking about a custom<br>
> built Linux I'd have to add the package manually and<br>
> compile from source...which cakes a long time to do. So<br>
> before attempting that....just wondering....is there a<br>
> better way? Anything I can try?<br>
<br>
</span>I think you're seriously overestimating the time it would<br>
take to compile QEMU or libvirt from source ;)<br>
<br>
An hour or so should be plenty to rebuild both components<br>
from source, and most of that time would be spent figuring<br>
out and gathering the build requirements rather than<br>
compiling.<br>
<span class="gmail-HOEnZb"><font color="#888888"><br>
-- <br>
Andrea Bolognani / Red Hat / Virtualization<br>
</font></span></blockquote></div><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"><br></div><div class="gmail_extra"> </div><div class="gmail_extra"> </div></div>
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