linux-kernel - Re: [PATCH 0/3] perf: hw_breakpoint safety improvements

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Message-ID: <20150731081031.GA13438@gmail.com>
Date:	Fri, 31 Jul 2015 10:10:31 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Andy Lutomirski <luto@...nel.org>,
	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org, Brian Gerst <brgerst@...il.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	X86 ML <x86@...nel.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Subject: Re: [PATCH 0/3] perf: hw_breakpoint safety improvements


* Andy Lutomirski <luto@...nel.org> wrote:

> Hi, Peter-
> 
> Here are some baby steps toward eliminating nested NMIs.  What do
> you think?
> 
> Andy Lutomirski (3):
>   x86/perf/hw_breakpoint: Disallow kernel breakpoints unless kprobe-safe
>   x86/perf/hw_breakpoint: Improve range breakpoint validation
>   x86/perf/hw_breakpoint: Fix check for kernelspace breakpoints
> 
>  arch/x86/kernel/hw_breakpoint.c | 31 ++++++++++++++++++++++++++++++-
>  include/linux/kprobes.h         |  2 ++
>  kernel/kprobes.c                |  2 +-
>  3 files changed, 33 insertions(+), 2 deletions(-)

Looks good to me at first glance. Cc:-ed Frederic who wrote and maintains these 
bits. Frederic, what do you think?

Thanks,

	Ingo
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