[Qemu-discuss] How to enable virtio-blk data plane ?

[Chengyuan Li]

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>

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

4. nova start the VM.

But seems that it doesn't work, could anyone help and let me know how to enable virtio-blk data plane? 

Regards,

Chengyuan