On Thu, Mar 06, 2014 at 03:06:29PM +0800, Du Jun wrote: You don't want to try to setup loop mounts yourself - tell libvirt todo it in the XML eg <filesystem type='file'> <source file='/some/file/image'/> <target dir='/some/mount/point'/> </filesystem> and then libvirt will create a loop device and mount it. If you just want the loop device and not mounted, then use <block type='file'> instead. Regards, Daniel -- |: http://berrange.com -o- http://www.flickr.com/photos/dberrange/ :| |: http://libvirt.org -o- http://virt-manager.org :| |: http://autobuild.org -o- http://search.cpan.org/~danberr/ :| |: http://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|