linux-kernel - Re: [PATCH RFC] NMI Re-introduce un[set]_nmi

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Message-ID: <20080904172052.GN3400@redhat.com>
Date:	Thu, 4 Sep 2008 13:20:52 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Prarit Bhargava <prarit@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, arozansk@...hat.com,
	Thomas.Mingarelli@...com, ak@...ux.intel.com,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>
Subject: Re: [PATCH RFC] NMI Re-introduce un[set]_nmi_callback

On Thu, Sep 04, 2008 at 05:52:17PM +0200, Andi Kleen wrote:
> Then if there's a chipset specific NMI driver it could
> also check if the chipset raised it. That would be a possible
> solution for HP -- they would need to implement such a driver
> for their systems with the special watchdog.

The thing with HP's special watchdog timer is that it does _not_ have a
chipset specific NMI it is trying to catch.  HP is going on the assumption
that _all_ NMIs are /bad/ and they want to catch _every_ NMI, log it, and
reboot the system.

Now obviously NMIs from kgdb and oprofile are not the ones a system should
panic on but this breaks HP's assumptions.

So that is part of the problem.  How do you become a catch-all for NMIs in
a system, to process as you wish, but ignore all the 'safe' NMIs?

Cheers,
Don
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