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[Xen-devel] Re: [PATCH 15/15] xen: Add a Xen specific ACPI Implementatio

To: Anthony Liguori <anthony@xxxxxxxxxxxxx>
Subject: [Xen-devel] Re: [PATCH 15/15] xen: Add a Xen specific ACPI Implementation to target-xen
From: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Date: Fri, 13 Aug 2010 20:37:45 +0100
Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, "qemu-devel@xxxxxxxxxx" <qemu-devel@xxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
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References: <alpine.DEB.2.00.1008121244200.2545@kaball-desktop> <1281622202-3453-15-git-send-email-stefano.stabellini@xxxxxxxxxxxxx> <4C6595B5.6060300@xxxxxxxxxxxxx>
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On Fri, 13 Aug 2010, Anthony Liguori wrote:
> On 08/12/2010 09:10 AM, stefano.stabellini@xxxxxxxxxxxxx wrote:
> > From: Anthony PERARD<anthony.perard@xxxxxxxxxx>
> >
> > Xen currently uses a different BIOS (hvmloader + rombios) therefore the
> > Qemu acpi_piix4 implementation wouldn't work correctly with Xen.
> > We plan on fixing this properly but at the moment we are just adding a
> > new Xen specific acpi_piix4 implementation.
> > This patch is optional; without it the VM boots but it cannot shutdown
> > properly or go to S3.
> >
> What's the long term plan?  Will Xen adopt SeaBIOS or will you adapt
> your BIOS to cope with our ACPI implementation?

I think it shouldn't be too difficult to adapt our current BIOS, but
we'll need few xen specific hooks in acpi_piix4.
The price that we'll have to pay doing so is loosing live-migration
compatibility with older xen installations.

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