From: Miroslav Benes <mbenes@suse.cz>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
Jiri Kosina <jikos@kernel.org>, Petr Mladek <pmladek@suse.com>,
Joe Lawrence <joe.lawrence@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
"Naveen N . Rao" <naveen.n.rao@linux.vnet.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"live-patching@vger.kernel.org" <live-patching@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com,
broonie@kernel.org, madvenka@linux.microsoft.com
Subject: Re: [PATCH v2 09/13] powerpc/ftrace: Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS
Date: Wed, 22 Dec 2021 15:19:20 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.21.2112221515020.18494@pobox.suse.cz> (raw)
In-Reply-To: <5831f711a778fcd6eb51eb5898f1faae4378b35b.1640017960.git.christophe.leroy@csgroup.eu>
On Mon, 20 Dec 2021, Christophe Leroy wrote:
> Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS. It accelerates the call
> of livepatching.
>
> Also note that powerpc being the last one to convert to
> CONFIG_DYNAMIC_FTRACE_WITH_ARGS, it will now be possible to remove
> klp_arch_set_pc() on all architectures.
Correct. We could replace it ftrace_instruction_pointer_set() and that is
it. In fact, livepatch.h in both arch/x86/include/asm/ and
arch/s390/include/asm/ could be removed with that.
On the other hand, there is arm64 live patching support being worked on
and I am not sure what their plans about DYNAMIC_FTRACE_WITH_ARGS are. The
above would make it a prerequisite.
Adding CCs... you can find the whole thread at
https://lore.kernel.org/all/cover.1640017960.git.christophe.leroy@csgroup.eu/
Miroslav
WARNING: multiple messages have this Message-ID (diff)
From: Miroslav Benes <mbenes@suse.cz>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: mark.rutland@arm.com, Petr Mladek <pmladek@suse.com>,
Joe Lawrence <joe.lawrence@redhat.com>,
broonie@kernel.org, Jiri Kosina <jikos@kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Steven Rostedt <rostedt@goodmis.org>,
madvenka@linux.microsoft.com, Ingo Molnar <mingo@redhat.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
"live-patching@vger.kernel.org" <live-patching@vger.kernel.org>,
"Naveen N . Rao" <naveen.n.rao@linux.vnet.ibm.com>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2 09/13] powerpc/ftrace: Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS
Date: Wed, 22 Dec 2021 15:19:20 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.21.2112221515020.18494@pobox.suse.cz> (raw)
In-Reply-To: <5831f711a778fcd6eb51eb5898f1faae4378b35b.1640017960.git.christophe.leroy@csgroup.eu>
On Mon, 20 Dec 2021, Christophe Leroy wrote:
> Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS. It accelerates the call
> of livepatching.
>
> Also note that powerpc being the last one to convert to
> CONFIG_DYNAMIC_FTRACE_WITH_ARGS, it will now be possible to remove
> klp_arch_set_pc() on all architectures.
Correct. We could replace it ftrace_instruction_pointer_set() and that is
it. In fact, livepatch.h in both arch/x86/include/asm/ and
arch/s390/include/asm/ could be removed with that.
On the other hand, there is arm64 live patching support being worked on
and I am not sure what their plans about DYNAMIC_FTRACE_WITH_ARGS are. The
above would make it a prerequisite.
Adding CCs... you can find the whole thread at
https://lore.kernel.org/all/cover.1640017960.git.christophe.leroy@csgroup.eu/
Miroslav
WARNING: multiple messages have this Message-ID (diff)
From: Miroslav Benes <mbenes@suse.cz>
To: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>,
Jiri Kosina <jikos@kernel.org>, Petr Mladek <pmladek@suse.com>,
Joe Lawrence <joe.lawrence@redhat.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ingo Molnar <mingo@redhat.com>,
"Naveen N . Rao" <naveen.n.rao@linux.vnet.ibm.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linuxppc-dev@lists.ozlabs.org" <linuxppc-dev@lists.ozlabs.org>,
"live-patching@vger.kernel.org" <live-patching@vger.kernel.org>,
linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com,
broonie@kernel.org, madvenka@linux.microsoft.com
Subject: Re: [PATCH v2 09/13] powerpc/ftrace: Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS
Date: Wed, 22 Dec 2021 15:19:20 +0100 (CET) [thread overview]
Message-ID: <alpine.LSU.2.21.2112221515020.18494@pobox.suse.cz> (raw)
In-Reply-To: <5831f711a778fcd6eb51eb5898f1faae4378b35b.1640017960.git.christophe.leroy@csgroup.eu>
On Mon, 20 Dec 2021, Christophe Leroy wrote:
> Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS. It accelerates the call
> of livepatching.
>
> Also note that powerpc being the last one to convert to
> CONFIG_DYNAMIC_FTRACE_WITH_ARGS, it will now be possible to remove
> klp_arch_set_pc() on all architectures.
Correct. We could replace it ftrace_instruction_pointer_set() and that is
it. In fact, livepatch.h in both arch/x86/include/asm/ and
arch/s390/include/asm/ could be removed with that.
On the other hand, there is arm64 live patching support being worked on
and I am not sure what their plans about DYNAMIC_FTRACE_WITH_ARGS are. The
above would make it a prerequisite.
Adding CCs... you can find the whole thread at
https://lore.kernel.org/all/cover.1640017960.git.christophe.leroy@csgroup.eu/
Miroslav
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next prev parent reply other threads:[~2021-12-22 14:19 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-20 16:37 [PATCH v2 00/13] Implement livepatch on PPC32 and more Christophe Leroy
2021-12-20 16:37 ` Christophe Leroy
2021-12-20 16:38 ` [PATCH v2 01/13] livepatch: Fix build failure on 32 bits processors Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2021-12-22 13:47 ` Miroslav Benes
2021-12-22 13:47 ` Miroslav Benes
2022-01-04 19:35 ` Joe Lawrence
2022-01-04 19:35 ` Joe Lawrence
2021-12-20 16:38 ` [PATCH v2 02/13] tracing: Fix selftest config check for function graph start up test Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2022-02-24 13:43 ` Christophe Leroy
2022-02-24 13:43 ` Christophe Leroy
2022-02-24 14:53 ` Steven Rostedt
2022-02-24 14:53 ` Steven Rostedt
2022-02-24 15:13 ` Christophe Leroy
2022-02-24 15:13 ` Christophe Leroy
2022-02-24 15:17 ` Steven Rostedt
2022-02-24 15:17 ` Steven Rostedt
2022-02-25 2:42 ` Michael Ellerman
2022-02-25 2:42 ` Michael Ellerman
2021-12-20 16:38 ` [PATCH v2 03/13] powerpc/module_32: Fix livepatching for RO modules Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2022-01-04 19:44 ` Joe Lawrence
2022-01-04 19:44 ` Joe Lawrence
2021-12-20 16:38 ` [PATCH v2 04/13] powerpc/ftrace: Add support for livepatch to PPC32 Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2021-12-22 14:00 ` Miroslav Benes
2021-12-22 14:00 ` Miroslav Benes
2021-12-20 16:38 ` [PATCH v2 05/13] powerpc/ftrace: Don't save again LR in ftrace_regs_caller() on PPC32 Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2021-12-20 16:38 ` [PATCH v2 06/13] powerpc/ftrace: Simplify PPC32's return_to_handler() Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2021-12-20 16:38 ` [PATCH v2 07/13] powerpc/ftrace: Prepare PPC32's ftrace_caller() for CONFIG_DYNAMIC_FTRACE_WITH_ARGS Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2021-12-20 16:38 ` [PATCH v2 08/13] powerpc/ftrace: Prepare PPC64's " Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2022-02-14 15:19 ` Naveen N. Rao
2022-02-14 15:19 ` Naveen N. Rao
2021-12-20 16:38 ` [PATCH v2 09/13] powerpc/ftrace: Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2021-12-22 14:19 ` Miroslav Benes [this message]
2021-12-22 14:19 ` Miroslav Benes
2021-12-22 14:19 ` Miroslav Benes
2022-02-14 15:25 ` Naveen N. Rao
2022-02-14 15:25 ` Naveen N. Rao
2022-02-15 8:00 ` Christophe Leroy
2022-02-15 8:00 ` Christophe Leroy
2022-02-15 11:05 ` Michael Ellerman
2022-02-15 11:05 ` Michael Ellerman
2022-02-15 13:36 ` Naveen N. Rao
2022-02-15 13:36 ` Naveen N. Rao
2022-02-15 14:28 ` Christophe Leroy
2022-02-15 14:28 ` Christophe Leroy
2022-02-15 14:51 ` Christophe Leroy
2022-02-15 14:51 ` Christophe Leroy
2022-02-15 16:25 ` Naveen N. Rao
2022-02-15 16:25 ` Naveen N. Rao
2022-02-16 13:04 ` Heiko Carstens
2022-02-16 13:04 ` Heiko Carstens
2022-02-16 13:27 ` Sven Schnelle
2022-02-16 13:27 ` Sven Schnelle
2022-02-15 14:38 ` Steven Rostedt
2022-02-15 14:38 ` Steven Rostedt
2022-02-15 16:26 ` Naveen N. Rao
2022-02-15 16:26 ` Naveen N. Rao
2021-12-20 16:38 ` [PATCH v2 10/13] powerpc/ftrace: Refactor ftrace_{en/dis}able_ftrace_graph_caller Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2021-12-20 16:38 ` [PATCH v2 11/13] powerpc/ftrace: directly call of function graph tracer by ftrace caller Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2022-02-14 17:24 ` Naveen N. Rao
2022-02-14 17:24 ` Naveen N. Rao
2022-02-14 19:03 ` Steven Rostedt
2022-02-14 19:03 ` Steven Rostedt
2021-12-20 16:38 ` [PATCH v2 12/13] powerpc/ftrace: Prepare ftrace_64_mprofile.S for reuse by PPC32 Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2022-02-14 17:51 ` Naveen N. Rao
2022-02-14 17:51 ` Naveen N. Rao
2022-02-15 8:33 ` Christophe Leroy
2022-02-15 8:33 ` Christophe Leroy
2021-12-20 16:38 ` [PATCH v2 13/13] powerpc/ftrace: Remove ftrace_32.S Christophe Leroy
2021-12-20 16:38 ` Christophe Leroy
2022-02-11 7:41 ` [PATCH] Fixup for next-test 3a1a8f078670 ("powerpc/ftrace: Remove ftrace_32.S") Christophe Leroy
2022-02-11 7:41 ` Christophe Leroy
2022-02-16 12:26 ` [PATCH v2 00/13] Implement livepatch on PPC32 and more Michael Ellerman
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