When running oVirt nested in oVirt, (this is useful for testing scenarios for example), it can be useful to configure power management for the nested "hosts" that will work by connecting to the hosting engine. This will allow, among other things, to test power management sequences on nested systems.
I assume it can use fence-virsh[1], but it probably needs the authentication to be set up as well. The comment there ('Virsh 0.3.3 on RHEL 5.2 with xen-3.0.3-51') is not very encouraging... [1] https://github.com/ClusterLabs/fence-agents/blob/master/fence/agents/virsh/fence_virsh.py
I don't see us investing in this (if we have IPMI / virtual BMC for VMs, then maybe). Closing for the time being.