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Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU

To: Dave Airlie <airlied@xxxxxxxxx>
Subject: Re: [Xen-devel] Re: [RFC] Make AGP work with IOMMU
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Thu, 06 Aug 2009 12:32:22 -0700
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Zhenyu Wang <zhenyu.z.wang@xxxxxxxxx>, Joerg Roedel <joerg.roedel@xxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, iommu@xxxxxxxxxxxxxxxxxxxxxxxxxx, David Woodhouse <dwmw2@xxxxxxxxxxxxx>, Keir Fraser <kier.fraser@xxxxxxxxxxxxx>
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On 08/05/09 16:12, Dave Airlie wrote:
> My main problem with doing this is getting testing coverage on older
> systems, if we change all the AGP drivers, the time to find we busted
> something is probably not until the next major distro release with this code
> in it. So people can run stuff on 5 year old hardware in 6 months? I'm
> not sure the gains justify the costs, but if you guys really want to do it
> I'll take the patch, just be prepared to have it ripped out the minute
> we get a regression we can't figure out because we haven't got the hw anymore.

Can you point to some changesets/patches to act as an example/template
for the changes needed?

If we come up with someone reporting crashes when using old hardware, we
can then make change then get them to test both native and Xen.


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