[libvirt-users] <qemu:commandline> domain XML tag is not working?

[Chengyuan Li]

Hi Eric,

Thanks!
You are right, I missed declaring namespace, now, the <qemu:commandline> is
saved after virsh edit.
However, both namespace and  <qemu:commandline> tag are lost after I run
"nova start" to launch the VM.
Any idea that how could I make this qemu command take effect ?

Regards,
CY.

On Mon, Apr 20, 2015 at 11:41 PM, Eric Blake <eblake at redhat.com> wrote:

> On 04/20/2015 08:37 AM, Chengyuan Li wrote:
> > Hi,
> >
> > I tried to enable virtio-blk data plane feature for VMs in my openstack
> > environment,  the hypervisor is ubuntu 14.04, libvirt 1.2.2 and QEMU 2.0.
> > As nova doesn't support that parameter yet, I did belows
> >
> > 1. nova boot a VM with raw disk image.
> > 2. nova stop the VM.
> > 3. run "virsh edit <instance-id>" on the hyprvisor node, and adding below
> > into instance xml just before </domain>.
> >
> > However, the <qemu:commandline> part is ignored and not saved after
> closing
> > virsh edit, seems that libvirt rejected these changes. Is there any XML
> > syntax error here? Or libvirt doesn't support <qemu:commandline> tag?
>
> If XML changes disappear after virsh edit, then it is a case of you
> using XML that wasn't recognized by libvirt.
>
> >
> > <qemu:commandline>
> >     <qemu:arg value='-set'/>
> >     <qemu:arg value='device.drive-virtio-disk0.x-data-plane=on'/>
> > </qemu:commandline>
>
> Did you also remember to declare the namespace? Per
> http://libvirt.org/drvqemu.html#qemucommand
>
> it is essential to have something like:
>
> <domain type='qemu' xmlns:qemu='http://libvirt.org/schemas/domain/qemu/1.0
> '>
>
> before any other <qemu:...> will be recognized.  (The namespace does not
> have to be named 'qemu:', but it makes it easier to stick to the naming
> used by the examples)
>
> --
> Eric Blake   eblake redhat com    +1-919-301-3266
> Libvirt virtualization library http://libvirt.org
>
>
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