Re: [Xen-devel] How could Xen know a certain GuestOS have already shutdown?

[Bruce Granger <vivagin@xxxxxxxx>]

It's my honor to receive your answer! Thanks very much!
I have learned much more under your guidance,but I still have a little
question!
I've traced the VIRQ_DOM_EXC which  send from Xen to Dom0 and picked up by
xenstored which fires the @releaseDomain watch when a GuestOS start to
shutdown.

Here, I still have two questions.
First, I haven't found anything useful in the archives about 'releaseDomain
watch'.What is the called '@releaseDomain' ? what's the use of it?
Second,I think that VIRQ_DOM_EXC is the signal used for communicate between
hypervisor and Dom0. I talked that with my parterner, we think that when
shutdown occurs, GuestOS will first get in touch with hypervisor ,then cause
the communication between Xen and Dom0 by VIRQ_DOM_EXC,is that right? What
we also want to know is when shutdown operation occurs in GuestOS, how
GuestOS communicate with the hypervisor first? Is there any signal or
somehow event delivery?
Could you tell me more about that?

Thanks a lot!



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