[libvirt-users] problem when using qemu 2.0.0 + libvirt 1.2.6

[Eric Blake]

On 07/29/2014 08:39 PM, weiwei li wrote:
> Hi
> I got a problem when using qemu 2.0.0 + libvirt 1.2.6 . It just can not
> define a kvm vm successfully ,  errors like this :
> 
> # virsh define 5ab4f49c-c99f-4dbd-9d7d-17a946b4c5a7.xml
> error: Failed to define domain from 5ab4f49c-c99f-4dbd-9d7d-17a946b4c5a7.xml
> error: unknown OS type hvm

Can you show the actual contents of that .xml file?

> 
> After several tries, i found that
> 
> Qemu2.0 /qemu-kvm1.2+ libvirt1.0.2 and lower version  is  ok
> Qemu2.0 /qemu-kvm1.2+ libvirt1.0.3 and higher version is failed

I wonder if you are seeing the result of tightening the parse; the old
versions were silently ignoring an impossible request, and the new
version is diagnosing the bug.  It may be as simple as modifying
whatever line requested "hvm" in your .xml file to instead request
something valid.  Then again, I have
  <os>
    <type arch='i686' machine='pc-i440fx-1.5'>hvm</type>
in a guest that is booting just fine for me on Fedora 20 with qemu 2.0
and libvirt 1.2.7-rc1.  In upstream libvirt.git, that error message is
only possible from this code in domain_conf.c:

    if (!virCapabilitiesSupportsGuestOSType(caps, def->os.type)) {
        virReportError(VIR_ERR_OS_TYPE,
                       "%s", def->os.type);

but I'm not sure why that function would be failing, unless your qemu
binary is not reporting features correctly.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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