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Re: [Xen-devel] [PATCH 00/02] firmware changes as part of QEMU/Xen merge

To: Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH 00/02] firmware changes as part of QEMU/Xen merge.
From: Keir Fraser <keir@xxxxxxx>
Date: Mon, 18 Oct 2010 16:34:41 +0100
Cc: Anthony Perard <anthony.perard@xxxxxxxxxx>, Xen Devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
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On 18/10/2010 16:10, "Stefano Stabellini" <Stefano.Stabellini@xxxxxxxxxxxxx>

> I agree.
> However in this particular case the firmware changes are only for ACPI
> support and we might be able to support both the old AND the new ioports
> in qemu-xen, so that we can switch the firmware to the new interface
> while keeping backward compatibility in qemu.
> That said I doubt we'll be able to do the same in upstream qemu, so at
> some point the old ioport interface will probably be dropped.

I don't think we can necessarily expect to drop all our patches against
upstream qemu, for things like that this that we (ought to) care about and
they don't need to care about and will consider ugly. The backwards
compatibility is going to be needed and be maintained somewhere -- if not in
core Xen releases, then it'll end up in XenServer/XCP -- so we may as well
get our story straight on it up front now.

 -- Keir

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