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RE: [Xen-devel] HVM guest shutdown send ACPI Power Event

To: "Keir Fraser" <Keir.Fraser@xxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-devel] HVM guest shutdown send ACPI Power Event
From: "Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>
Date: Fri, 23 Mar 2007 15:55:52 -0400
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Thread-topic: [Xen-devel] HVM guest shutdown send ACPI Power Event
> -----Original Message-----
> From: Keir Fraser [mailto:Keir.Fraser@xxxxxxxxxxxx] 
> Sent: Friday, March 23, 2007 2:27 PM
> To: Ross S. W. Walker; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: Re: [Xen-devel] HVM guest shutdown send ACPI Power Event
> On 23/3/07 14:29, "Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx> wrote:
> > Is there any plans to help HVM guests shutdown cleanly by 
> issuing an ACPI
> > power button event on HVM shutdown with a configurable timeout?
> > 
> > This way it would allow ACPI aware HVM guests to initiate a 
> clean shutdown and
> > xend will only forcibly shutdown the guest if it hasn't 
> powered itself off
> > within the timeout value.
> > 
> > This would be extremely helpful for Windows guests which 
> can detect the ACPI
> > power button event and cleanly shutdown.
> I think this is quite likely. It just needs someone to grok 
> how the ACPI
> event mechanism works. I expect some extra procedures are 
> needed in the ACPI
> tables, an extra IO port perhaps needs to be emulated in 
> qemu-dm and also
> we'd need to trigger ACPI SCIs from qemu.

Sounds good, if I wasn't clueless on system BIOS I'd jump in
with a patch, otherwise I will just have to add it to the wish
list for 3.0.5.

Of course the python scripts will also need to be modified to
add a timeout wait option for HVM guests, otherwise the
qemu-dm will signal an ACPI power event, but xend will kill
the guest before it can shutdown.


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