Description of problem:
$summary says pretty much all.

I have a server sitting in a corner, loaded with tons of iso images,
the images are exported read-only via nfs to other machines.

Trying to use them fails in F12.  F11 used to work just fine.  Now libvirt is very upset because it has no write access to the file system and thus can't set ownership and selinux attributes.

Version-Release number of selected component (if applicable):
libvirt-0.7.1-15.fc12.x86_64