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

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Date:	Mon, 24 Dec 2007 06:54:30 -0500
From:	Jeff Garzik <jeff@...zik.org>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	Linus Torvalds <torvalds@...ux-foundation.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

Arjan van de Ven wrote:
> I can see the point of having a sysfs attribute to enable MMCONF from userspace, so
> that userland diagnostics tools can turn it on if they really really want to.
> (I'd make that printk a nice warning "application XYZ is enabling extended config space for devize ABC" so
> that if the box then crashes and burns, people know who/why and where to direct their emails ;-)
> 
> We did something similar for "enable", it's maybe 10 lines of code or so.
> 
> I would assume lspci and friends would then only turn that on at explicit admin request

Absolutely...  I'm not asking to default it on, just asking for it to be 
possible :)

	Jeff


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