With the current c2 kernel, virt-manager/virsh has stopped working. I suspect it is related to this:
http://forum.odroid.com/viewtopic.php?f=136&t=18971&start=50#p133845
and the patch for it is here:
https://github.com/OtherCrashOverride/c2-merge-conflicts/blob/master/0001-aml_thermal-Do-not-rename-device.patch