linux-kernel - [RFC 0/4] arm64: add livepatch support

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Message-Id: <1429843449-7388-1-git-send-email-takahiro.akashi@linaro.org>
Date:	Fri, 24 Apr 2015 11:44:05 +0900
From:	AKASHI Takahiro <takahiro.akashi@...aro.org>
To:	rostedt@...dmis.org, mingo@...nel.org, jpoimboe@...hat.com,
	sjenning@...hat.com, jkosina@...e.cz, vojtech@...e.cz,
	catalin.marinas@....com, will.deacon@....com
Cc:	broonie@...nel.org, masami.hiramatsu.pt@...achi.com,
	live-patching@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linaro-kernel@...ts.linaro.org, linux-kernel@...r.kernel.org,
	AKASHI Takahiro <takahiro.akashi@...aro.org>
Subject: [RFC 0/4] arm64: add livepatch support

This patchset enables livepatch support on arm64.

Livepatch was merged in v4.0, and allows replacying a function dynamically
based on ftrace framework, but it also requires -mfentry option of gcc.
Currently arm64 gcc doesn't support it, but by adding a helper function to
ftrace, we will be able to support livepatch on arch's which don't support
this option.

I submit this patchset as RFC since I'm not quite sure that I'm doing
in the right way, or we should definitely support -fentry instead.

Please note that I tested the feature only with livepatch-sample, and
the code for DYNAMIC_TRACE_WITH_REGS is still rough-edged.

To: Steven Rostedt <rostedt@...dmis.org>
To: Ingo Molnar <mingo@...nel.org>
To: Josh Poimboeuf <jpoimboe@...hat.com>
To: Seth Jennings <sjenning@...hat.com>
To: Jiri Kosina <jkosina@...e.cz>
To: Vojtech Pavlik <vojtech@...e.cz>
To: Catalin Marinas <catalin.marinas@....com>
To: Will Deacon <will.deacon@....com>

AKASHI Takahiro (4):
  ftrace: add a helper function for livepatch
  livepatch: adjust a patched function's address
  arm64: ftrace: add DYNAMIC_TRACE_WITH_REGS version
  arm64: add livepatch support

 arch/arm64/Kconfig                 |    4 ++
 arch/arm64/include/asm/ftrace.h    |    4 ++
 arch/arm64/include/asm/livepatch.h |   38 +++++++++++
 arch/arm64/kernel/Makefile         |    1 +
 arch/arm64/kernel/entry-ftrace.S   |  124 ++++++++++++++++++++++++++++++++++++
 arch/arm64/kernel/ftrace.c         |   24 ++++++-
 arch/arm64/kernel/livepatch.c      |   68 ++++++++++++++++++++
 arch/x86/include/asm/livepatch.h   |    5 ++
 include/linux/ftrace.h             |    2 +
 include/linux/livepatch.h          |    2 +
 kernel/livepatch/core.c            |   16 +++--
 kernel/trace/ftrace.c              |   26 ++++++++
 12 files changed, 309 insertions(+), 5 deletions(-)
 create mode 100644 arch/arm64/include/asm/livepatch.h
 create mode 100644 arch/arm64/kernel/livepatch.c

-- 
1.7.9.5

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