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 13:00:35 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>,
	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.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


* Andi Kleen <ak@...ux.intel.com> wrote:

> Hidetoshi Seto 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)
>
> The MCA declares if it comes with ADDR or MISC in a status bit and 
> the MCA code only accesses these MSRs if these status bits are 
> set. Also I believe P3 implemented ADDR at least, likely even 
> MISC.
>
> The old 32bit MCA code did that too

That's true, but did you also want to make a specific point?

	Ingo
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