Xen DomU maintenance from Dom0
xm shutdown xyz
mount -o loop disk.img /mnt/os-image/
chroot /mnt/os-image/
# Do your stuff
exit
umount /mnt/os-image
xm shutdown xyz
mount -o loop disk.img /mnt/os-image/
chroot /mnt/os-image/
# Do your stuff
exit
umount /mnt/os-image