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

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Message-ID: <4654B530.2050705@pobox.com>
Date:	Wed, 23 May 2007 17:42:08 -0400
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Jesse Barnes <jbarnes@...tuousgeek.org>
CC:	Alan Cox <alan@...rguk.ukuu.org.uk>,
	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

Jesse Barnes wrote:
> 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. :)

Indeed.  It's just a register space.  Assuming one register space is 
"more evil" than another, simply because it is bigger, is.. well.. silly.

	Jeff



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