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Peter Anvin" , "x86@kernel.org" , "Naveen N. Rao" , Anil S Keshavamurthy , "David S. Miller" , Masami Hiramatsu CC: "linux-doc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: [PATCH v2 0/3] arm64: KPROBES_ON_FTRACE Thread-Topic: [PATCH v2 0/3] arm64: KPROBES_ON_FTRACE Thread-Index: AQHVVwpwV+h0FsWU/0egxpRGPuo38A== Date: Tue, 20 Aug 2019 03:50:42 +0000 Message-ID: <20190820113928.1971900c@xhacker.debian> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [124.74.246.114] x-clientproxiedby: TYAPR01CA0085.jpnprd01.prod.outlook.com (2603:1096:404:2c::25) To BYAPR03MB4773.namprd03.prod.outlook.com (2603:10b6:a03:134::24) authentication-results: spf=none (sender IP is ) smtp.mailfrom=Jisheng.Zhang@synaptics.com; x-ms-exchange-messagesentrepresentingtype: 1 x-mailer: Claws Mail 3.17.3 (GTK+ 2.24.32; x86_64-pc-linux-gnu) x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 7cad8a21-29f0-4c17-7c10-08d7252192f2 x-microsoft-antispam: BCL:0;PCL:0;RULEID:(2390118)(7020095)(4652040)(8989299)(4534185)(4627221)(201703031133081)(201702281549075)(8990200)(5600148)(711020)(4605104)(1401327)(2017052603328)(7193020);SRVR:BYAPR03MB4373; x-ms-traffictypediagnostic: BYAPR03MB4373: x-ms-exchange-purlcount: 1 x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:6790; x-forefront-prvs: 013568035E x-forefront-antispam-report: SFV:NSPM;SFS:(10009020)(396003)(136003)(366004)(39860400002)(346002)(376002)(199004)(189003)(316002)(6506007)(102836004)(966005)(25786009)(6486002)(8676002)(2501003)(486006)(476003)(71190400001)(71200400001)(305945005)(6116002)(3846002)(7736002)(186003)(1076003)(386003)(86362001)(26005)(7416002)(52116002)(110136005)(54906003)(81166006)(14454004)(6306002)(9686003)(5660300002)(66946007)(256004)(8936002)(66446008)(64756008)(81156014)(53936002)(66556008)(14444005)(99286004)(66476007)(66066001)(478600001)(4326008)(2906002)(50226002)(6512007)(6436002)(921003)(1121003)(39210200001);DIR:OUT;SFP:1101;SCL:1;SRVR:BYAPR03MB4373;H:BYAPR03MB4773.namprd03.prod.outlook.com;FPR:;SPF:None;LANG:en;PTR:InfoNoRecords;A:0;MX:1; received-spf: None (protection.outlook.com: synaptics.com does not designate permitted sender hosts) x-ms-exchange-senderadcheck: 1 x-microsoft-antispam-message-info: u01VlxGd3t6NF2hd4khno/EYL8S7gfo2ZKkqUdyJ9FTZgqXV0m4P7kksTgy3Zu2wSDull8R72aCzjzifZIf144x/UPHyDVMs8jggk94z1tOaNkhRnSwu7VkU01s38fxyP4jfoGfRHUQBmmomOcQhLTdJ8DnwC0J5do9ZoeH8mLsdgAXFkW2l2yrVhghqTxhkZbwj7eu+syyU/e70CI/sLtQOpc1TEP4rniGdYXJ9IGzbs+rscnINfpXRLAbJPYGXJlKndy+c+aAHHDAOEomqgA50JUS4xFm8JuEqC+8mpi8gUqcnDCdgYU7seVM1j9klfPbAwhai34+SI4dMhQ4YrW/9Z3Q9xsTk5eUfGlHxy+TJpQShggRarquazfMWaXUSBeQz5LoToMPzRZNStsXW4Lxonm4vHhrc7Hz0vh6CHo8= x-ms-exchange-transport-forked: True Content-Type: text/plain; charset="us-ascii" Content-ID: <0C886B6B54FCDA4BB1F6AAA1F63460EC@namprd03.prod.outlook.com> Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: synaptics.com X-MS-Exchange-CrossTenant-Network-Message-Id: 7cad8a21-29f0-4c17-7c10-08d7252192f2 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Aug 2019 03:50:42.9645 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 335d1fbc-2124-4173-9863-17e7051a2a0e X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: kAtQoR6natp2qXSa/Sos8p++x3QudfIBm9GyaBMe555grmEeW4PaAWP9OUWMAfz7GYbKBLR8T0rOFSDugxNGsw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR03MB4373 Sender: linux-doc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org 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.ht= ml Changes since v1: - make the kprobes/x86: use instruction_pointer and instruction_pointer_s= et 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 --=20 2.23.0.rc1