Re: [Xen-devel] how to callback from hypervisor to guest os?

[weiming <zephyr.zhao@xxxxxxxxx>]

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? 

(In the interrupt handler, I need the guest to look up something within its own kernel data structure and return the result to xen. This is the purpose of my question)

Thanks in advance!

Weiming

On Sun, Jul 6, 2008 at 5:26 PM, Daniel Stodden <stodden@xxxxxxxxxx> wrote:

On Sun, 2008-07-06 at 11:46 -0400, weiming wrote:
> Hi Daniel,
>
> Thanks a lot. You confirmed my worries. Event channel may not work for
> me since I need to call the function in a interrupt handler.
> I'll check out trap injection. I don't know what is this, hope it
> would be helpful.

Pardon, sloppy word choice. What I mean would be rather called a 'trap
bounce' or just 'callback' in the Xen source. Event channel activations
work on top of that.

Best,

Daniel

--
Daniel Stodden
LRR     -      Lehrstuhl für Rechnertechnik und Rechnerorganisation
Institut für Informatik der TU München             D-85748 Garching
http://www.lrr.in.tum.de/~stodden         mailto:stodden@xxxxxxxxxx
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