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 17:20:53 -0700
Message-ID: <4872B2E5.2000008@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 Jeremy,
>
> Thanks for your answering.
>
> If my understanding is correct, do you mean the hypervisor side should 
> look like:
>
> Xen:                                             
>
> _interrupt_handler()                                    
>   ...
>   ...
>   event_send(guest_dom) 
>   while(event_receive(&result))
>   {
>
>   }                                                  
> post: xxx()                                 
>                                                            
>   ...
> }
>

No, not at all.  It would have to be something like:

interrupt_handler()
{
	set_up_state(guest_dom);
	send_event(guest_dom);
}

...

do_my_hypercall(...)
{
	do_stuff(guest_dom);
}


    J