Xen devel - Mar 2007 - HVM guest shutdown send ACPI Power Event

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.


Ross S. W. Walker
Information Systems Manager
Medallion Financial, Corp.
437 Madison Avenue
38th Floor
New York, NY 10022
Tel: (212) 328-2165
Fax: (212) 328-2125
WWW: http://www.medallion.com 


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On 23/3/07 14:29, "Ross S. W. Walker" <rwalker@medallion.com>
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.

 -- Keir



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> -----Original Message-----
> From: Keir Fraser [mailto:Keir.Fraser@cl.cam.ac.uk] 
> Sent: Friday, March 23, 2007 2:27 PM
> To: Ross S. W. Walker; xen-devel@lists.xensource.com
> Subject: Re: [Xen-devel] HVM guest shutdown send ACPI Power Event
> 
> On 23/3/07 14:29, "Ross S. W. Walker"
<rwalker@medallion.com> 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.

-Ross

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> Is there any plans to help HVM guests shutdown cleanly by issuing an ACPI
> power button event on HVM shutdown with a configurable timeout?
Excellent questian! :-)


Julian


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