linux-kernel - Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources

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Message-Id: <200705231438.03910.jbarnes@virtuousgeek.org>
Date:	Wed, 23 May 2007 14:37:58 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
Cc:	Jeff Garzik <jgarzik@...ox.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Robert Hancock <hancockr@...w.ca>,
	Olivier Galibert <galibert@...ox.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Andi Kleen <ak@...e.de>, Chuck Ebbert <cebbert@...hat.com>,
	Len Brown <lenb@...nel.org>
Subject: Re: [RFC PATCH] PCI MMCONFIG: add validation against ACPI motherboard resources

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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