Hi, Aron I failed to boot domainU, then I checked FC6's config. Why do you set xen's driver to "m"? I think the following driver should be "y". CONFIG_XEN_NETDEV_BACKEND=m CONFIG_XEN_NETDEV_FRONTEND=m CONFIG_XEN_BLKDEV_BACKEND=m CONFIG_XEN_NETDEV_LOOPBACK=m CONFIG_XEN_BLKDEV_FRONTEND=m Best Regards, Akio Takebe