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Add XEN_DOMCTL_set_max_evtchn which may be used during domain creation to set the maximum event channel port a domain may use. This may be used to limit the amount of Xen resources (global mapping space and xenheap) that a domain may use for event channels. A domain that does not have a limit set may use all the event channels supported by the event channel ABI in use. Signed-off-by: David Vrabel <david.vrabel@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com> Acked-by: Daniel De Graaf <dgdegra@tycho.nsa.gov> Acked-by: Keir Fraser <keir@xen.org>