Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
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- Subject: Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- From: "H. Peter Anvin" <hpa@xxxxxxxxx>
- Date: Mon, 13 Apr 2009 09:27:20 -0700
- Cc: Avi Kivity <avi@xxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Pavel Machek <pavel@xxxxxx>, mingo@xxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, tglx@xxxxxxxxxxxxx, hpa@xxxxxxxxxxxxxxx, rjw@xxxxxxx, linux-tip-commits@xxxxxxxxxxxxxxx
- In-reply-to: <20090413042459.GA6479@xxxxxxx>
- References: <20090410103934.GA21506@xxxxxxx> <20090410104648.GA31516@xxxxxxxxxx> <20090410112546.GD21506@xxxxxxx> <20090410113824.GA18823@xxxxxxxxxx> <49E0C1AB.2050608@xxxxxxxxxx> <49E17A6E.5000104@xxxxxxxxx> <alpine.LFD.2.00.0904120754240.4583@xxxxxxxxxxxxxxxxxxxxx> <20090412163356.GA2392@xxxxxxx> <49E2398A.3050405@xxxxxxxxxx> <20090413041625.GF11652@xxxxxxx> <20090413042459.GA6479@xxxxxxx>
- User-agent: Thunderbird 2.0.0.14 (X11/20080501)
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.
I don't know how realistic it is to make the low 1 MB completely unused
over the s2ram cycle. The trivial way of doing it is to simply not use
it -- it's only some 600K after all; a more sophisticated way would be
to explicitly constrain it to transient uses that would be dead at s2ram.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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- References:
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
- Re: [tip:x86/setup] x86, setup: "glove box" BIOS calls -- infrastructure
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