In regards of RDO Kilo , manual update of libvirt.xml doesn't make any sense. Libvirt.xml will be regenerated according classes and methods defined in virt/libvirt/config.py and virt/libvirt/driver.py after rebooting instance via nova. Details here :-
http://bderzhavets.blogspot.com/2015/06/enable-dashboard-spice-console-in-rdo.html
Original post for IceHouse by Y.Kawada
http://www.slideshare.net/YukihiroKawada/rdo-spice
http://bderzhavets.blogspot.com/2015/06/enable-dashboard-spice-console-in-rdo.html
Original post for IceHouse by Y.Kawada
http://www.slideshare.net/YukihiroKawada/rdo-spice