linux-kernel - RE: [PATCH] x86/mce: Do not use bank 1 for APEI generated error logs.

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Date:	Tue, 31 May 2016 18:18:42 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Borislav Petkov <bp@...en8.de>
CC:	"linux-edac@...r.kernel.org" <linux-edac@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Aristeu Rozanski" <arozansk@...hat.com>
Subject: RE: [PATCH] x86/mce: Do not use bank 1 for APEI generated error
 logs.

> Btw, would it have any benefit of writing a "magic" value in m.bank
> to denote the error comes from APEI instead of number of banks which
> differs between generations?
>
> Something like
>
>	m.bank = -1;
>
> or so?

That might be a bit more obvious than my subtle "one more than possible
on this platform" magic number.

> 255 banks will never happen anyway! (Famous last words ... :-)))

Intel is stuck at 32 unless we come up with a new mechanism and change
all the code that generates MSR numbers with "base + 4*i". There are
some virtualization MSRs allocated at what would be bank32.

-Tony