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This hypercall has been present since Xen 3.1, and is the preferred method for a domain to obtain its UUID. Fall back to the xenstore method if using an older version of Xen (which returns -ENOSYS). Signed-off-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>