Add the capability for QEMU's packed virtqueues for virtio that supposedly have
better cache utilization and performance compared to the default split queues.
Reviewed-by: NJán Tomko <jtomko@redhat.com>
Reviewed-by: NBoris Fiuczynski <fiuczy@linux.ibm.com>
Signed-off-by: NBjoern Walk <bwalk@linux.ibm.com>
Signed-off-by: NJán Tomko <jtomko@redhat.com>