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