libvirt users - Jan 2012 - Question about libvirt / LXC

Hi there,

I have a small simple question about libvirt and LXC containers. I know 
how to activate /dev/net/tun in an LXC container:

#tun
lxc.cgroup.devices.allow = c 10:200 rwm

in the LXC config file.

But, how to do that in a libvirt XML file? I just need to activate the 
/dev/net/tun device in an LXC container using libvirt.

Thanks for your answers!

Best regards.
Sam