linux-kernel - Re: [boot crash] Re: [tip:x86/mce3] x86, mce: use 64bit machine check code on 32bit

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Date:	Mon, 17 Aug 2009 11:20:47 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	ak@...ux.intel.com, tglx@...utronix.de,
	Yinghai Lu <yinghai@...nel.org>,
	Huang Ying <ying.huang@...el.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	linux-tip-commits@...r.kernel.org
Subject: Re: [boot crash] Re: [tip:x86/mce3] x86, mce: use 64bit machine
	check code on 32bit


* Hidetoshi Seto <seto.hidetoshi@...fujitsu.com> wrote:

> One possibility is: if the BIOS doesn't clear status in banks, new 
> mce codes will try to log such junks. If the junk is totally junk 
> but can be decoded as a valid log with MISCV or ADDRV bit, and if 
> the cpu try to access register which is not implemented (e.g. 
> IA32_MCi_MISC/ADDR), then such access might cause a general 
> protection exception. (ref. ASDM 3A 15.3.2.3)

btw., that reminds me: mce_rdmsrl() needs to be fixed to use 
rdmsrl_safe() and it should emit a WARN_ONCE() if it ever hits an 
error while trying to access registers.

	Ingo
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