On Mon, Apr 20, 2015 at 10:37:13PM +0800, 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 [I haven't tested the virtio-blk data plane myself.] This libvirt version seems a little old (from March 2014), you might want to move to a bit newer. > 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>. You're modifying the guest definition behind Nova's back, so you get to keep all the pieces if something breaks. :-) > 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? > > <qemu:commandline> > <qemu:arg value='-set'/> > <qemu:arg value='device.drive-virtio-disk0.x-data-plane=on'/> > </qemu:commandline> -- /kashyap

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?

<qemu:commandline> <qemu:arg value='-set'/> <qemu:arg value='device.drive-virtio-disk0.x-data-plane=on'/> </qemu:commandline>

Hi Eric, Thanks! You are right, I missed declaring namespace, now, the <qemu:commandline> is saved after virsh edit.

Regards, CY. On Mon, Apr 20, 2015 at 11:41 PM, Eric Blake <eblake(a)redhat.com&gt; 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 > > _______________________________________________ libvirt-users mailing list libvirt-users(a)redhat.com https://www.redhat.com/mailman/listinfo/libvirt-users