linux-kernel - Re: [RFC 4/6] x86, NMI, Rewrite NMI handler

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Message-ID: <20100913011655.GI21909@erda.amd.com>
Date:	Mon, 13 Sep 2010 03:16:55 +0200
From:	Robert Richter <robert.richter@....com>
To:	Huang Ying <ying.huang@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC 4/6] x86, NMI, Rewrite NMI handler

On 09.09.10 22:51:03, Huang Ying wrote:
> DIE_NMI_IPI is used to process CPU specific NMI sources, such as perf
> event, oprofile, crash IPI, etc. While DIE_NMI is used to process
> non-CPU-specific NMI sources, such as APEI (ACPI Platform Error
> Interface) GHES (Generic Hardware Error Source), etc.
> 
> DIE_NMI_IPI must be processed before DIE_NMI. For example, perf event
> trigger a NMI on CPU 1, at the same time, APEI GHES trigger another
> NMI on CPU 0. If DIE_NMI is processed before DIE_NMI_IPI, it is
> possible that APEI GHES is processed on CPU 1, while unknown NMI is
> gotten on CPU 0.

Ingo, Peter,

couldn't this be the reason for the regression we are observing with
unhandled nmis?

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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