From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeremy Fitzhardinge <jeremy@goop.org>
Subject: Re: how to callback from hypervisor to guest os?
Date: Mon, 07 Jul 2008 14:57:46 -0700
Message-ID: <4872915A.1080705@goop.org>
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To: weiming <zephyr.zhao@gmail.com>
Cc: Xen Developers <xen-devel@lists.xensource.com>, Daniel Stodden <stodden@cs.tum.edu>
List-Id: xen-devel@lists.xenproject.org

weiming wrote:
> Hi Daniel,
>
> Event channel is one-way and async, right?
> When hypervisor send a notification to guest within a interrupt 
> handler, can the guest receive and response to the notification? If 
> yes, after guest finished processing, can the control be back to xen?

It can do a hypercall.

    J