linux-kernel - Re: [PATCH 0/6 v3] [GIT PULL] x86: Workaround for NMI iret woes

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Date:	Sun, 8 Jan 2012 09:48:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 0/6 v3] [GIT PULL] x86: Workaround for NMI iret woes


* Steven Rostedt <rostedt@...dmis.org> wrote:

> 
> Ingo,
> 
> I updated the patches to reflect your comments and ran them through
> all my tests again. Below is the full diff between v2 and v3.
> 
> I renamed nmi_preprocess() and nmi_postprocess() to
> nmi_nesting_preprocess() and nmi_nesting_postprocess() to at least
> note that this has to do with nmi nesting. I also commented the
> fact that i386 may loop back to the preprocess.
> 
> I had to move the debug_usage functions to debugreg.h, because
> smp.h includes processor.h where making the inc/dec inline
> caused include header issues.
> 
> -- Steve
> 
> Please pull the latest tip/x86/core-3 tree, which can be found at:
> 
>   git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace.git
> tip/x86/core-3
> 
> Head SHA1: 42181186ad4db986fcaa40ca95c6e407e9e79372
> 
> 
> Linus Torvalds (1):
>       x86: Do not schedule while still in NMI context
> 
> Steven Rostedt (5):
>       x86: Document the NMI handler about not using paranoid_exit
>       x86: Add workaround to NMI iret woes
>       x86: Keep current stack in NMI breakpoints
>       x86: Allow NMIs to hit breakpoints in i386
>       x86: Add counter when debug stack is used with interrupts enabled
> 
> ----
>  arch/x86/include/asm/debugreg.h |   22 ++++
>  arch/x86/include/asm/desc.h     |   12 ++
>  arch/x86/kernel/cpu/common.c    |   24 +++++
>  arch/x86/kernel/entry_64.S      |  218 +++++++++++++++++++++++++++++++++------
>  arch/x86/kernel/head_64.S       |    4 +
>  arch/x86/kernel/nmi.c           |  102 ++++++++++++++++++
>  arch/x86/kernel/traps.c         |   20 ++++
>  7 files changed, 369 insertions(+), 33 deletions(-)

Pulled, thanks a lot Steve! I've ran 500 randconfig iterations 
and these bits seem fine.

Thanks,

	Ingo
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