linux-kernel - Re: [RFC] x86, NMI, Treat unknown NMI as hardware error

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Message-ID: <20110517190738.GH29881@redhat.com>
Date:	Tue, 17 May 2011 15:07:38 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Andi Kleen <ak@...ux.intel.com>
Cc:	Huang Ying <ying.huang@...el.com>,
	Cyrill Gorcunov <gorcunov@...il.com>,
	huang ying <huang.ying.caritas@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>,
	Robert Richter <robert.richter@....com>
Subject: Re: [RFC] x86, NMI, Treat unknown NMI as hardware error

On Tue, May 17, 2011 at 11:18:59AM -0700, Andi Kleen wrote:
> > Random thought, in the Firmware first mode of HEST (which is the only way
> > GHES records get produced??), does an SCI happen first to jump into the
> > firmware for processing, then an NMI?
> 
> Either that or there is a separate service processor which handles it.
> Presumably it depends a lot on the particular system.

Ah interesting.  I was going to suggest somehow setting a bit when an SCI
comes in and check that bit in the unknown NMI path as a possible hint
that the NMI might be related to HEST (sorta how we flag unknown NMIs in
the perf code).

It was just an idea.  Obviously a service processor will make that more
difficult. :-)

Cheers,
Don
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