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tools. /dev/xen/evtchn is now used by daemons to connect to remote domains: the advantage is that the local ports are garbage collected automatically if the daemon dies. xen no longer constructs end-to-end event-channel port pairs -- it allocates an unbound port in new domU and writes that port to xenstore. It is then picked up by teh appropriate daemon which does interdomain bind via /dev/xen/evtchn. Signed-off-by: Keir Fraser <keir@xensource.com>