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xen-devel
RE: [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.
-Ross
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