I tried to use libvirt and virtualbox-ose, but i only get this error:
$ virsh Fehler: no hypervisor driver available Fehler: Verbindung zum Hypervisor scheiterte
After an "strace -e open virsh" i found, that it can't found VBoxXPCOMC.so. Virtualbox-ose installs into /usr/lib64/virtualbox-ose/ but libvirt searchs in /usr/lib64/virtualbox ...
The solution was to set the env-variable VBOX_APP_HOME before starting virsh:
VBOX_APP_HOME=/usr/lib64/virtualbox-ose virsh
And now it works! :-)