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Re: [Xen-devel] [RFC][PATCH] allow dom0 to power off machine using ACPI

To: Harry Butterworth <harry@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [RFC][PATCH] allow dom0 to power off machine using ACPI on shutdown.
From: Muli Ben-Yehuda <mulix@xxxxxxxxx>
Date: Thu, 06 Apr 2006 21:46:02 +0300
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On Thu, Apr 06, 2006 at 07:36:10PM +0100, Harry Butterworth wrote:

> This is an evil little patch which allows my dom0 to power off the
> machine on shutdown successfully and doesn't break my domU shutdown
> behaviour.
> The #if bits are ugly and are present because pm_power_off is declared
> above in the same #if context, maybe they are not necessary.  I'm not
> sure about the solution for ia64.
> This powers down the machine without bothering to tell the
> hypervisor.

I wonder why we go to the hypervisor for shutdown at the moment. I
don't see anything interesting being done for x86, and we could always
have dom0 notifying Xen that it's going to shut down, and then
shutting down whe the hypercall return.

> I thought this kind of solution was better than trying to import a lot
> more ACPI cruft into Xen.  Any thoughts?

I think you want kernel_power_off() here, which should do the right
thing for all architectures.

Muli Ben-Yehuda
http://www.mulix.org | http://mulix.livejournal.com/

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