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From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Jonathan Corbet <corbet@lwn.net>, Will Deacon <will@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	"David S. Miller" <davem@davemloft.net>,
	Masami Hiramatsu <mhiramat@kernel.org>
Cc: "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Subject: [PATCH v2 0/3] arm64: KPROBES_ON_FTRACE
Date: Tue, 20 Aug 2019 03:50:42 +0000	[thread overview]
Message-ID: <20190820113928.1971900c@xhacker.debian> (raw)

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


WARNING: multiple messages have this Message-ID (diff)
From: Jisheng Zhang <Jisheng.Zhang@synaptics.com>
To: Catalin Marinas <catalin.marinas@arm.com>,
	Jonathan Corbet <corbet@lwn.net>, Will Deacon <will@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
	"H. Peter Anvin" <hpa@zytor.com>,
	"x86@kernel.org" <x86@kernel.org>,
	"Naveen N. Rao" <naveen.n.rao@linux.ibm.com>,
	Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>,
	"David S. Miller" <davem@davemloft.net>,
	Masami Hiramatsu <mhiramat@kernel.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	"linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>
Subject: [PATCH v2 0/3] arm64: KPROBES_ON_FTRACE
Date: Tue, 20 Aug 2019 03:50:42 +0000	[thread overview]
Message-ID: <20190820113928.1971900c@xhacker.debian> (raw)

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


_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

             reply	other threads:[~2019-08-20  3:50 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-20  3:50 Jisheng Zhang [this message]
2019-08-20  3:50 ` [PATCH v2 0/3] arm64: KPROBES_ON_FTRACE Jisheng Zhang
2019-08-20  3:52 ` [PATCH v2 1/3] kprobes/x86: use instruction_pointer and instruction_pointer_set Jisheng Zhang
2019-08-20  3:52   ` Jisheng Zhang
2019-08-20  8:53   ` Thomas Gleixner
2019-08-20  8:53     ` Thomas Gleixner
2019-08-20  9:02     ` Jisheng Zhang
2019-08-20  9:02       ` Jisheng Zhang
2019-08-20  9:20       ` Jisheng Zhang
2019-08-20  9:20         ` Jisheng Zhang
2019-08-20 13:21       ` Peter Zijlstra
2019-08-20 13:21         ` Peter Zijlstra
2019-08-21  2:02         ` Jisheng Zhang
2019-08-21  2:02           ` Jisheng Zhang
2019-08-21  1:52       ` Masami Hiramatsu
2019-08-21  1:52         ` Masami Hiramatsu
2019-08-21  2:09         ` Jisheng Zhang
2019-08-21  2:09           ` Jisheng Zhang
2019-08-23 14:51           ` Masami Hiramatsu
2019-08-23 14:51             ` Masami Hiramatsu
2019-08-20  3:53 ` [PATCH v2 2/3] kprobes: adjust kprobe addr for KPROBES_ON_FTRACE Jisheng Zhang
2019-08-20  3:53   ` Jisheng Zhang
2019-08-20 10:15   ` Naveen N. Rao
2019-08-20 10:15     ` Naveen N. Rao
2019-08-20 10:41     ` Jisheng Zhang
2019-08-20 10:41       ` Jisheng Zhang
2019-08-21  2:07   ` Masami Hiramatsu
2019-08-21  2:07     ` Masami Hiramatsu
2019-08-21  2:50     ` Jisheng Zhang
2019-08-21  2:50       ` Jisheng Zhang
2019-08-20  3:54 ` [PATCH v2 3/3] arm64: implement KPROBES_ON_FTRACE Jisheng Zhang
2019-08-20  3:54   ` Jisheng Zhang
2019-08-20  7:17   ` Jisheng Zhang
2019-08-20  7:17     ` Jisheng Zhang
2019-08-20  8:53   ` Thomas Gleixner
2019-08-20  8:53     ` Thomas Gleixner

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