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Xen Community Terminology
Domain: A container for a running virtual machine. Colloquially,
the VM itself.
Domain 0: The first domain. Privileged to manage other
domains. a.k.a. “dom0”.
Unprivileged domain: Any domain other than domain 0.
Cannot manage other domains. a.k.a. “domU”.
Driver domain: A domain that contains physical drivers. Usually
this is just domain 0.
Physical driver: A device driver (usually in the driver domain)
that talks to the hardware.
Virtual driver: A device driver (usually in a domU) that fullfills
requests by going to the physical driver.