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Message-ID: <20100716224140.GI7338@basil.fritz.box>
Date: Sat, 17 Jul 2010 00:41:40 +0200
From: Andi Kleen <andi@...stfloor.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andi Kleen <andi@...stfloor.org>, Avi Kivity <avi@...hat.com>,
"H. Peter Anvin" <hpa@...or.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
LKML <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Ingo Molnar <mingo@...e.hu>,
Peter Zijlstra <peterz@...radead.org>,
Steven Rostedt <rostedt@...dmis.org>,
Steven Rostedt <rostedt@...tedt.homelinux.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Thomas Gleixner <tglx@...utronix.de>,
Christoph Hellwig <hch@....de>, Li Zefan <lizf@...fujitsu.com>,
Lai Jiangshan <laijs@...fujitsu.com>,
Johannes Berg <johannes.berg@...el.com>,
Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
Arnaldo Carvalho de Melo <acme@...radead.org>,
Tom Zanussi <tzanussi@...il.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Jeremy Fitzhardinge <jeremy@...p.org>,
"Frank Ch. Eigler" <fche@...hat.com>
Subject: Re: [patch 2/2] x86 NMI-safe INT3 and Page Fault
On Fri, Jul 16, 2010 at 03:26:32PM -0700, Linus Torvalds wrote:
> On Fri, Jul 16, 2010 at 3:07 PM, Andi Kleen <andi@...stfloor.org> wrote:
> >
> > One issue I have with nesting NMIs is that you need
> > a nesting limit, otherwise you'll overflow the NMI stack.
>
> Have you actually looked at the suggestion I (and now Mathieu)
> suggested code for?
Maybe I'm misunderstanding everything (and it has been a lot of emails
in the thread), but the case I was thinking of would be if the second NMI
faults too, and then another one comes in after the IRET etc.
-Andi
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