[libvirt-users] Libvirt for custom VM

Hi, I need to create an application where I can use a single interface for different VMs (libvirt becomes an obvious choice then). However I will need to control a VM running on custom hypervisor other than ones currently supported by libvirt. Is it possible to add a new interface to the hypervisor (easily)? Shall I try to use "test-hypervisor" supported by libvirt ?? I shall be grateful for some initial pointers to read which can help me for the task. Thanks and Regards, Ankur