linux-kernel - Re: [patch, take 3] PCI: use ACPI to verify extended config space on x86

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Message-ID: <200607141000_MC3-1-C4FF-945F@compuserve.com>
Date:	Fri, 14 Jul 2006 09:57:54 -0400
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	Arjan van de Ven <arjan@...radead.org>
Cc:	linux-pci <linux-pci@...ey.karlin.mff.cuni.cz>,
	Greg KH <greg@...ah.com>, Andrew Morton <akpm@...l.org>,
	Andi Kleen <ak@...e.de>, "Brown, Len" <len.brown@...el.com>,
	Rajesh Shah <rajesh.shah@...el.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [patch, take 3] PCI: use ACPI to verify extended config
  space on x86

In-Reply-To: <1152869988.3159.25.camel@...topd505.fenrus.org>

On Fri, 14 Jul 2006 11:39:48 +0200, Arjan van de Ven wrote:

> > Extend the verification for PCI-X/PCI-Express extended config
> > space pointer. Checks whether the MCFG address range is listed
> > as a motherboard resource, per the PCI firmware spec.
> 
> I'm still not quite happy about this; the entire point of the check is
> that we CAN'T trust the ACPI implementation, and want a second opinion.
> This patch basically asks the ACPI implementation if we can trust the
> ACPI implementation. I'm not sure that's a good idea.
> And I understood that most issues went away with the more relaxed check
> that is in gregkh's tree already (if not in mainline, I should check
> that). 

The more-relaxed check is in mainline.  I wrote it, but it didn't even
fix the problem on my own machine. This did.

According to Rajesh, the spec doesn't require the MCFG space to be
e820-reserved, so that's not really a valid check.

-- 
Chuck
 "You can't read a newspaper if you can't read."  --George W. Bush
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