linux-kernel - Re: [PATCH] [9/50] i386: validate against ACPI motherboard resources

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Message-Id: <1190484117.4035.71.camel@chaos>
Date:	Sat, 22 Sep 2007 20:01:57 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Robert Hancock <hancockr@...w.ca>
Cc:	Yinghai Lu <yhlu.kernel@...il.com>, Andi Kleen <ak@...e.de>,
	rajesh.shah@...el.com, jbarnes@...tuousgeek.org, greg@...ah.com,
	patches@...-64.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [9/50] i386: validate against ACPI motherboard
	resources

On Sat, 2007-09-22 at 10:28 -0600, Robert Hancock wrote:
> Yinghai Lu wrote:
> > No!
> > 
> > MMCONFIG will not work with acpi=off any more.
> 
> I don't think this is unreasonable. The ACPI MCFG table is how we are 
> supposed to learn about the area in the first place. If we can't get the 
> table location via an approved mechanism, and can't validate it doesn't 
> overlap with another memory reservation or something, I really don't 
> think we should be using it.

We all know how correct ACPI tables are. Specifications are nice,
reality tells a different story.

> I don't think it's much of an issue anyway - the chances that somebody 
> will want to run without ACPI on a system with MCFG are pretty low given 
> that you'll end up losing a bunch of functionality (not least of which 
> is multi-cores).

acpi=off is an often used debug switch and it _is_ quite useful. Taking
away debug functionality is not a good idea.

	tglx


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