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

To: "Ross S. W. Walker" <rwalker@xxxxxxxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] HVM guest shutdown send ACPI Power Event
From: Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>
Date: Fri, 23 Mar 2007 18:26:56 +0000
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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.

 -- Keir

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