linux-kernel - [PATCH v2 0/3] arm64: KPROBES_ON

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Message-ID: <20190820113928.1971900c@xhacker.debian>
Date:   Tue, 20 Aug 2019 03:50:42 +0000
From:   Jisheng Zhang <Jisheng.Zhang@...aptics.com>
To:     Catalin Marinas <catalin.marinas@....com>,
        Jonathan Corbet <corbet@....net>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
        Anil S Keshavamurthy <anil.s.keshavamurthy@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Masami Hiramatsu <mhiramat@...nel.org>
CC:     "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: [PATCH v2 0/3] arm64: KPROBES_ON_FTRACE

KPROBES_ON_FTRACE avoids much of the overhead with regular kprobes as it
eliminates the need for a trap, as well as the need to emulate or
single-step instructions.

Applied after arm64 FTRACE_WITH_REGS:
http://lists.infradead.org/pipermail/linux-arm-kernel/2019-August/674404.html

Changes since v1:
  - make the kprobes/x86: use instruction_pointer and instruction_pointer_set
    as patch1
  - add Masami's ACK to patch1
  - add some description about KPROBES_ON_FTRACE and why we need it on
    arm64
  - correct the log before the patch
  - remove the consolidation patch, make it as TODO
  - only adjust kprobe's addr when KPROBE_FLAG_FTRACE is set
  - if KPROBES_ON_FTRACE, ftrace_call_adjust() the kprobe's addr before
    calling ftrace_location()
  - update the kprobes-on-ftrace/arch-support.txt in doc

Jisheng Zhang (3):
  kprobes/x86: use instruction_pointer and instruction_pointer_set
  kprobes: adjust kprobe addr for KPROBES_ON_FTRACE
  arm64: implement KPROBES_ON_FTRACE

 .../debug/kprobes-on-ftrace/arch-support.txt  |  2 +-
 arch/arm64/Kconfig                            |  1 +
 arch/arm64/kernel/probes/Makefile             |  1 +
 arch/arm64/kernel/probes/ftrace.c             | 60 +++++++++++++++++++
 arch/x86/kernel/kprobes/ftrace.c              |  9 +--
 kernel/kprobes.c                              | 10 +++-
 6 files changed, 75 insertions(+), 8 deletions(-)
 create mode 100644 arch/arm64/kernel/probes/ftrace.c

-- 
2.23.0.rc1