[RFC V2 PATCH 0/1] kexec: crash_kexec_post_notifiers boot option related fixes

From: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
To: Andrew Morton <akpm@linux-foundation.org>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Vivek Goyal <vgoyal@redhat.com>
Cc: linux-mips@linux-mips.org, Baoquan He <bhe@redhat.com>,
	kexec@lists.infradead.org, linux-kernel@vger.kernel.org,
	HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
	Daniel Walker <dwalker@fifo99.com>,
	Ingo Molnar <mingo@kernel.org>
Subject: [RFC V2 PATCH 0/1] kexec: crash_kexec_post_notifiers boot option related fixes
Date: Fri, 24 Jul 2015 10:16:15 +0900	[thread overview]
Message-ID: <20150724011615.6834.79628.stgit@softrs> (raw)

This is a bugfix patch for crash_kexec_post_notifiers boot option
which allows users to call panic notifiers and kmsg dumpers before
kdump.

This fixes one of the problems reported by Daniel Walker
(https://lkml.org/lkml/2015/6/24/44). 

 Problem 1:
 If crash_kexec_post_notifiers boot option is specified, some
 shutting down process which assume other cpus are still alive
 don't work properly.

 Problem 2 (addressed by this patch):
 If crash_kexec_post_notifiers boot option is specified, register
 information of other cpus are not saved to crash dumps.

Following Vivek's opinion, this patch replaces smp_send_stop()
in panic() with suitable version for crash_kexec which saves
cpu states and other things like cleaning up VMX/SVM.  Since this
needs architecture specific implementation and it's not so trivial,
this version only support for x86.  So the problem 1, known to
happen on MIPS/OCTEON, is not addressed now.

To keep the modification impact low, this patch doesn't change
the logic basically if crash_kexec_post_notifiers is not specified.

Please note that crash_kexec() can be called directly without
entering panic().  Stopping other cpus functionality is still
needed in crash_kexec().

Changes in V2:
- Replace smp_send_stop() call with crash_kexec version which
  saves cpu states and does cleanups instead of changing execution
  flow
- Drop a fix for Problem 1
- Drop other patches because they aren't needed anymore

V1: https://lkml.org/lkml/2015/7/10/316

---

Hidehiro Kawai (1):
      panic/x86: Replace smp_send_stop() with crash_kexec version

 arch/x86/kernel/crash.c |   16 +++++++++++-----
 kernel/panic.c          |   29 +++++++++++++++++++++++------
 2 files changed, 34 insertions(+), 11 deletions(-)

-- 
Hidehiro Kawai
Hitachi, Ltd. Research & Development Group

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