> So what is the purpose of initializing EVTCHN driver in DomainU
Don't think anything uses it at the moment. You could, in principle, write an 
application that opens the evtchn device in a domU and handles some kind of 
strange messages sent from dom0 that are not handled by anything in kernel.
I don't suppose it needs to be there but OTOH, it's not very big ;-)
Cheers,
Mark
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