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Rao" CC: Christophe Leroy , "linux-kernel@vger.kernel.org" , "linuxppc-dev@lists.ozlabs.org" , "live-patching@vger.kernel.org" Subject: [PATCH v2 04/13] powerpc/ftrace: Add support for livepatch to PPC32 Thread-Topic: [PATCH v2 04/13] powerpc/ftrace: Add support for livepatch to PPC32 Thread-Index: AQHX9b/6eBLNZiqJgUWhrC7ryztVNA== Date: Mon, 20 Dec 2021 16:38:12 +0000 Message-ID: <63cb094125b6a6038c65eeac2abaabbabe63addd.1640017960.git.christophe.leroy@csgroup.eu> References: In-Reply-To: Accept-Language: fr-FR, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=csgroup.eu; x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: e2addbaa-6311-4300-5c8d-08d9c3d71d84 x-ms-traffictypediagnostic: MRZP264MB2924:EE_ x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:635; x-ms-exchange-senderadcheck: 1 x-ms-exchange-antispam-relay: 0 x-microsoft-antispam: BCL:0; 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charset="iso-8859-1" Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 X-OriginatorOrg: csgroup.eu X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: MRZP264MB2988.FRAP264.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-Network-Message-Id: e2addbaa-6311-4300-5c8d-08d9c3d71d84 X-MS-Exchange-CrossTenant-originalarrivaltime: 20 Dec 2021 16:38:12.9297 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 9914def7-b676-4fda-8815-5d49fb3b45c8 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: ChFmWvWOABelcK9FVA5CY/jemslILH9HrJKlFWvJrU/THHALjlfOvWr/epV4BVLBynysYBJSCHF0RiFzaHXAvF+74PCzGav04vtBbcHJyKY= X-MS-Exchange-Transport-CrossTenantHeadersStamped: MRZP264MB2924 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org PPC64 needs some special logic to properly set up the TOC. See commit 85baa095497f ("powerpc/livepatch: Add live patching support on ppc64le") for details. PPC32 doesn't have TOC so it doesn't need that logic, so adding LIVEPATCH support is straight forward. Add CONFIG_LIVEPATCH_64 and move livepatch stack logic into that item. Livepatch sample modules all work. Signed-off-by: Christophe Leroy --- arch/powerpc/Kconfig | 6 +++++- arch/powerpc/include/asm/livepatch.h | 8 +++++--- arch/powerpc/include/asm/thread_info.h | 2 +- arch/powerpc/kernel/asm-offsets.c | 2 +- 4 files changed, 12 insertions(+), 6 deletions(-) diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index 0631c9241af3..cdac2115eb00 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -9,6 +9,10 @@ config 64BIT bool default y if PPC64 +config LIVEPATCH_64 + def_bool PPC64 + depends on LIVEPATCH + config MMU bool default y @@ -230,7 +234,7 @@ config PPC select HAVE_KPROBES_ON_FTRACE select HAVE_KRETPROBES select HAVE_LD_DEAD_CODE_DATA_ELIMINATION - select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS && PPC64 + select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS select HAVE_MOD_ARCH_SPECIFIC select HAVE_NMI if PERF_EVENTS || (PPC64 && PPC_BOOK3S) select HAVE_OPTPROBES diff --git a/arch/powerpc/include/asm/livepatch.h b/arch/powerpc/include/asm/livepatch.h index 4fe018cc207b..37af961eb74c 100644 --- a/arch/powerpc/include/asm/livepatch.h +++ b/arch/powerpc/include/asm/livepatch.h @@ -23,12 +23,14 @@ static inline void klp_arch_set_pc(struct ftrace_regs *fregs, unsigned long ip) static inline unsigned long klp_get_ftrace_location(unsigned long faddr) { /* - * Live patch works only with -mprofile-kernel on PPC. In this case, - * the ftrace location is always within the first 16 bytes. + * Live patch works on PPC32 and only with -mprofile-kernel on PPC64. In + * both cases, the ftrace location is always within the first 16 bytes. */ return ftrace_location_range(faddr, faddr + 16); } +#endif /* CONFIG_LIVEPATCH */ +#ifdef CONFIG_LIVEPATCH_64 static inline void klp_init_thread_info(struct task_struct *p) { /* + 1 to account for STACK_END_MAGIC */ @@ -36,6 +38,6 @@ static inline void klp_init_thread_info(struct task_struct *p) } #else static inline void klp_init_thread_info(struct task_struct *p) { } -#endif /* CONFIG_LIVEPATCH */ +#endif #endif /* _ASM_POWERPC_LIVEPATCH_H */ diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h index 5725029aaa29..42f8a1f99036 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -51,7 +51,7 @@ struct thread_info { unsigned int cpu; #endif unsigned long local_flags; /* private flags for thread */ -#ifdef CONFIG_LIVEPATCH +#ifdef CONFIG_LIVEPATCH_64 unsigned long *livepatch_sp; #endif #if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32) diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c index 7582f3e3a330..eec536aef83a 100644 --- a/arch/powerpc/kernel/asm-offsets.c +++ b/arch/powerpc/kernel/asm-offsets.c @@ -94,7 +94,7 @@ int main(void) OFFSET(TASK_CPU, task_struct, thread_info.cpu); #endif -#ifdef CONFIG_LIVEPATCH +#ifdef CONFIG_LIVEPATCH_64 OFFSET(TI_livepatch_sp, thread_info, livepatch_sp); #endif -- 2.33.1