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

To:	"Jeremy Fitzhardinge" <jeremy@xxxxxxxx>
Subject:	Re: [Xen-devel] how to callback from hypervisor to guest os?
From:	weiming <zephyr.zhao@xxxxxxxxx>
Date:	Mon, 7 Jul 2008 18:14:47 -0400
Cc:	Xen Developers <xen-devel@xxxxxxxxxxxxxxxxxxx>, Daniel Stodden <stodden@xxxxxxxxxx>
Delivery-date:	Mon, 07 Jul 2008 15:15:09 -0700
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Do you mean making a hypercall after guest domain finishes processing? If so, in xen, after event_send(), will xxx() be executed immediately (non-blocking)?

Xen:                                              Guest:

_interrupt_handler()
{
   ...
   ...
   event_send(guest_dom)                event_virq_handler()
post: xxx()                                  {
                                                              do_process()
                                                              hypercall_xxx()?

                                                     }
   ...
}

On Mon, Jul 7, 2008 at 5:57 PM, Jeremy Fitzhardinge <jeremy@xxxxxxxx> wrote:

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

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