linux-kernel - Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure

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Message-ID: <9b2b86520904131134y26f508ffr2bc0303eff203a25@mail.gmail.com>
Date:	Mon, 13 Apr 2009 19:34:39 +0100
From:	Alan Jenkins <sourcejedi.lkml@...glemail.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Avi Kivity <avi@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Pavel Machek <pavel@....cz>, mingo@...hat.com,
	linux-kernel@...r.kernel.org, tglx@...utronix.de,
	hpa@...ux.intel.com, rjw@...k.pl, linux-tip-commits@...r.kernel.org
Subject: Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- 
	infrastructure

On 4/13/09, H. Peter Anvin <hpa@...or.com> wrote:
> Ingo Molnar wrote:
>>> Yes, we could do memory checks, and ... hey, we already do that:
>>>
>>>    bb577f9: x86: add periodic corruption check
>>>    5394f80: x86: check for and defend against BIOS memory corruption
>>>
>>> ... and i seem to be the one who implemented it! ;-)
>>
>> s/implemented/merged+fixed :-)
>
> Actually, what would probably be more productive than trying to track
> corruption would be to drop the low 1 MB of memory before suspend to RAM
> - make sure that it is as close to completely unused as possible.
>
> All *known* cases of low memory corruption are either boot time or due
> to s2ram.

IIRC, the first person to report the issue found that it triggered
when hotplugging a HDMI cable.
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