From: Thomas Gleixner <tglx@linutronix.de>
To: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Jonathan Corbet <corbet@lwn.net>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
"Eric W. Biederman" <ebiederm@xmission.com>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vivek Goyal <vgoyal@redhat.com>,
linux-doc@vger.kernel.org, x86@kernel.org,
kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@kernel.org>, Ingo Molnar <mingo@redhat.com>,
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Subject: Re: [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option
Date: Tue, 13 Oct 2015 22:22:58 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.11.1510132219480.25029@nanos> (raw)
In-Reply-To: <20150925112811.4258.54494.stgit@softrs>
On Fri, 25 Sep 2015, Hidehiro Kawai wrote:
> This patch introduces new boot option "noextnmi" which disables
> external NMI. This option is useful for the dump capture kernel
> so that an HA application or administrator wouldn't mistakenly
> shoot down the kernel by NMI.
>
> Currently, only x86 supports this option.
You might add that is can be used for debugging purposes as
well. External NMIs can be their own source of trouble. :)
> Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Ingo Molnar <mingo@redhat.com>
> Cc: "H. Peter Anvin" <hpa@zytor.com>
> Cc: Jonathan Corbet <corbet@lwn.net>
> ---
> Documentation/kernel-parameters.txt | 4 ++++
> arch/x86/kernel/apic/apic.c | 17 ++++++++++++++++-
> 2 files changed, 20 insertions(+), 1 deletion(-)
>
> diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
> index 22a4b68..8bcaccd 100644
> --- a/Documentation/kernel-parameters.txt
> +++ b/Documentation/kernel-parameters.txt
> @@ -2379,6 +2379,10 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
> noexec=on: enable non-executable mappings (default)
> noexec=off: disable non-executable mappings
>
> + noextnmi [X86]
> + Mask external NMI. This option is useful for a
> + dump capture kernel to be shot down by NMI.
That should read: "...not to be shot down", right?
Other than that.
Acked-by: Thomas Gleixner <tglx@linutronix.de>
next prev parent reply other threads:[~2015-10-13 20:24 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-25 11:28 [V4 PATCH 0/4] Fix race issues among panic, NMI and crash_kexec Hidehiro Kawai
2015-09-25 11:28 ` [V4 PATCH 1/4] panic/x86: Fix re-entrance problem due to panic on NMI Hidehiro Kawai
2015-09-25 12:13 ` 河合英宏 / KAWAI，HIDEHIRO
2015-09-30 11:26 ` Peter Zijlstra
2015-10-01 1:02 ` 河合英宏 / KAWAI，HIDEHIRO
2015-09-25 11:28 ` [V4 PATCH 2/4] panic/x86: Allow cpus to save registers even if they are looping in NMI context Hidehiro Kawai
2015-09-30 11:50 ` Peter Zijlstra
2015-10-01 1:43 ` 河合英宏 / KAWAI，HIDEHIRO
2015-09-25 11:28 ` [V4 PATCH 3/4] kexec: Fix race between panic() and crash_kexec() called directly Hidehiro Kawai
2015-09-28 3:53 ` kbuild test robot
2015-09-28 7:08 ` 河合英宏 / KAWAI，HIDEHIRO
2015-09-30 11:53 ` Peter Zijlstra
2015-10-01 2:04 ` 河合英宏 / KAWAI，HIDEHIRO
2015-09-28 4:02 ` kbuild test robot
2015-09-28 4:46 ` 河合英宏 / KAWAI，HIDEHIRO
2015-09-25 11:28 ` [V4 PATCH 4/4] x86/apic: Introduce noextnmi boot option Hidehiro Kawai
2015-09-30 11:55 ` Peter Zijlstra
2015-10-01 2:33 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-01 6:27 ` Peter Zijlstra
2015-10-01 7:01 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-01 8:43 ` Borislav Petkov
2015-10-01 10:24 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-01 11:01 ` Borislav Petkov
2015-10-02 0:58 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-02 7:47 ` Borislav Petkov
2015-10-05 2:03 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-05 8:27 ` Borislav Petkov
2015-10-05 9:21 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-05 10:14 ` Borislav Petkov
2015-10-13 11:55 ` 河合英宏 / KAWAI，HIDEHIRO
[not found] ` <alpine.DEB.2.11.1510132210590.25029@nanos>
2015-10-14 13:54 ` Ingo Molnar
2015-10-16 1:58 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-13 20:22 ` Thomas Gleixner [this message]
2015-10-14 3:39 ` 河合英宏 / KAWAI，HIDEHIRO
[not found] ` <alpine.DEB.2.11.1510140924370.25029@nanos>
2015-10-16 2:02 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-27 8:46 ` Baoquan He
2015-10-27 9:01 ` 河合英宏 / KAWAI，HIDEHIRO
2015-10-27 9:06 ` 'Baoquan He'
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