On 01/04/2013 07:02 AM, achala joshi wrote: Hot topic lately; you're the second person to ask. There have been patches proposed for libvirt to implement the support natively: https://www.redhat.com/archives/libvir-list/2012-November/msg00731.html But that work is not yet incorporated into libvirt (it is still under discussion); in the meantime, while waiting for it to be resolved, you can use qemu passthrough to specify the arguments that libvirt does not map: http://libvirt.org/drvqemu.html#qemucommand You can use 'virsh edit' to add in your arbitrary qemu command-line arguments. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org