linux-kernel - Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver opt-in

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Date:	Fri, 11 Jan 2008 13:12:12 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Matthew Wilcox <matthew@....cx>
cc:	Greg KH <gregkh@...e.de>, Arjan van de Ven <arjan@...radead.org>,
	Greg KH <greg@...ah.com>, linux-kernel@...r.kernel.org,
	Jeff Garzik <jeff@...zik.org>,
	linux-pci@...ey.karlin.mff.cuni.cz,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Martin Mares <mj@....cz>
Subject: Re: [Patch v2] Make PCI extended config space (MMCONFIG) a driver
 opt-in



On Fri, 11 Jan 2008, Matthew Wilcox wrote:
> 
> But they can't.  We limit the size they can access to 256 bytes, unless
> the kernel probed address 256 and it worked.

Umm. Probing address 256 (or *any* address) using MMCONFIG will simply 
lock up the machine. HARD.

What's so hard to understand about MMCONFIG being broken on certain 
hardware?

		Linus
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