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

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Message-ID: <46F5816B.3070908@zytor.com>
Date:	Sat, 22 Sep 2007 13:56:11 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yhlu.kernel@...il.com>
CC:	Robert Hancock <hancockr@...w.ca>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>, 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

Yinghai Lu wrote:
>>> We all know how correct ACPI tables are. Specifications are nice,
>>> reality tells a different story.
>> MMCONFIG can't be used without ACPI in any case unless we know where the
>>   table is using chipset-specific knowledge (i.e. reading the registers
>> directly). Doing that without being told that this area is really
>> intended to be used, via the ACPI table, is dangerous, i.e. we don't
>> necessarily know if the MMCONFIG is broken on the platform in some way
>> we can't detect.
> 
> the BIOS get these info from the chipset too.
> for AMD Fam 10h opteron, we can read that MSR for MMCONFIG base.

I think he's saying we don't know a safe place to park the MMCONFIG area
if we don't have this information.  However, this applies to *any*
allocation of address space, which we do all the time, so although a
valid argument this has been decided already many times over.

	-hpa
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