[libvirt] arbitrary qemu command feature

Hello List, I had a problem with the recently added qemu command feature (no one on user list could help): This feature: http://libvirt.org/news.html 0.8.3: Aug 4 2010 Improvements: Handle arbitrary qemu command-lines in qemuParseCommandLine. Qemu arbitrary command-line arguments. Also described here: http://www.spinics.net/linux/fedora/libvir/msg26687.html [PATCH v4 0/8]: Add arbitrary qemu command-line and monitor commands I am using the following libvirt 0.8.3 packages from unbuntu 10.10: libvirt-bin 0.8.3-1ubuntu14 libvirt0 0.8.3-1ubuntu14 python-libvirt 0.8.3-1ubuntu14 Example of problem: "$ virsh edit my.xml" refuses to add / will not save the following to a domain (for this domain graphics type='sdl') using the specified format: <qemu:commandline> <qemu:arg value='-ctrl-grab'/> </qemu:commandline> If I edit and save the xml directly the change is not recognized upon start-up of the domain. That is, I must use ctrl+alt instead of the right ctrl for mouse capture. Am I missing a library or package needed? Am I using this feature correctly? Is there a working example or additional documentation somewhere? Any suggestions?