Date: Tue, 17 May 2011 15:07:38 -0400
From: Don Zickus <dzickus@redhat.com>
To: Andi Kleen <ak@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>, Cyrill Gorcunov <gorcunov@gmail.com>,
        huang ying <huang.ying.caritas@gmail.com>, Ingo Molnar <mingo@elte.hu>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Andi Kleen <andi@firstfloor.org>,
        Robert Richter <robert.richter@amd.com>
Subject: Re: [RFC] x86, NMI, Treat unknown NMI as hardware error
Message-ID: <20110517190738.GH29881@redhat.com>
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 <4DD07959.4030608@intel.com>
 <20110516190310.GH31888@redhat.com>
 <4DD20A2F.604@intel.com>
 <20110517142427.GL31888@redhat.com>
 <20110517163847.GF24805@tassilo.jf.intel.com>
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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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