linux-kernel - Re: [PATCH RFC] function probe_roms accessing improper addresses

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Message-ID: <508173D6.6040209@zytor.com>
Date:	Fri, 19 Oct 2012 08:37:58 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Matthew Garrett <mjg@...hat.com>
CC:	Randy Wright <rwright@...com>, linux-kernel@...r.kernel.org,
	Thavatchai Makphaibulchoke <tmac@...com>
Subject: Re: [PATCH RFC] function probe_roms accessing improper addresses

On 10/19/2012 08:30 AM, Matthew Garrett wrote:
> I don't think DMI checking is going to work, since (a) as you say,
> there's a risk that the ID will inadvertantly change over the lifecycle
> of the machine, and (b) there may be other machines. So if it's not
> possible to handle this by catching the MCE, I think we have two
> options:
>
> 1) Declare that any x86 hardware supported by Linux *must* support
> probing in this address region
>
> 2) Don't call probe_roms() by default, but leave it up to the graphics
> drivers. If they can get the rom by any other means then don't call it.
>

Honestly, (1) is the proper option.  Hearing that this is a prototype, I 
would like to say "fix your bloody hardware/firmware"...

The legacy region is special and will always be special, and so any 
attempts at making it non-special is a losing battle.

	-hpa

-- 
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel.  I don't speak on their behalf.

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