From: Jesse Barnes <jbarnes@virtuousgeek.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources
Date: Wed, 23 May 2007 14:37:58 -0700
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Cc: Jeff Garzik <jgarzik@pobox.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Robert Hancock <hancockr@shaw.ca>,
       Olivier Galibert <galibert@pobox.com>,
       linux-kernel <linux-kernel@vger.kernel.org>, Andi Kleen <ak@suse.de>,
       Chuck Ebbert <cebbert@redhat.com>, Len Brown <lenb@kernel.org>
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On Wednesday, May 23, 2007 2:35 pm Alan Cox wrote:
> > One of the reasons why hardware vendors want to move away from
> > traditional accesses is to be able to use the larger config space
> > in PCI-Express, rather than being locked into the 256-byte legacy
> > PCI config space.
>
> Mostly for treacherous computing extensions where subsets of the
> config space can only be accessed by signed machines blessed by your
> favourite movie company and video card vendor...

I hate "trusted" platform garbage as much as the next guy 
(where "trusted" means the actual user can't trust it, just the 
seller), but I think there are legitimate uses of extended space as 
well, PCIe AER uses it iirc, so don't dismiss it on those grounds. :)

Jesse
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