A DomU is the counterpart to Dom0; it is an unprivileged domain with (by default) no access to the hardware. It must run a FrontendDriver for multiplexed hardware it wishes to share with other domains. A DomU is started by running
xl create <xen-config-filename>
in Dom0. The kernel for a DomU comes from Dom0's filesystem, not from the filesystem exported to the DomU.
- DomU Support for Xen : List of supported operation systems