linux-kernel - Re: [patch] Make MMCONFIG space (extended PCI config space) a driver opt-in issue

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Message-ID: <476DF8B2.2060608@zytor.com>
Date:	Sat, 22 Dec 2007 21:57:06 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Jeff Garzik <jeff@...zik.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	linux-kernel@...r.kernel.org, gregkh@...e.de,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [patch] Make MMCONFIG space (extended PCI config space) a driver
 opt-in issue

Jeff Garzik wrote:
> 
> 2) It is legal for PCI-Express to put capabilities anywhere in PCI 
> config space, including extended config space.  (I hope our PCI cap 
> walking code checks for overruns...)
> 

Uh, not really.  The classical capability format only has 8-bit 
addresses, and the spec requires that all extended config space that is 
used be claimed by extended capabilities -- a different format chain.

	-hpa
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