[libvirt] Libvirt - Xen Enterprise - Koan

Hi Our VM's currently run on top of Xen Enterprise, not my choice but thats the way it has to be at the moment. I'd like to be able to still use cobbler/koan to provision the systems and so i have managed to get libvirt installed onto a Xen Enterprise host. Libvirt starts but it cant connect to Xend as i presume Xen Enterprise behaves differently to Xen. Does anyone have any success with libvirt and Xen Enterprise ? thanks for any tips/experience