linux-kernel - [PATCH v2 0/3] arm64 live patching

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Message-Id: <20180817102544.C628D68EF4@newverein.lst.de>
Date:   Fri, 17 Aug 2018 12:25:44 +0200 (CEST)
From:   duwe@....de (Torsten Duwe)
To:     Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Julien Thierry <julien.thierry@....com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        AKASHI Takahiro <takahiro.akashi@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        live-patching@...r.kernel.org
Subject: [PATCH v2 0/3] arm64 live patching

Hi all!

Here's v2; I hope I have incorporated all feedback properly.
Julien: #S_X28 + 8 is in, but ftrace_modify_call() is referenced
from generic code: kernel/trace/ftrace.c __ftrace_replace_code()

And I'd *really* like some feedback from ARM/Linaro/... on the stack
unwinder!

[Changes from v1]:

* Missing compiler support is now a Makefile error, instead
  of a warning. This will keep the compile log shorter and
  it will thus be easier to spot the problem.

* A separate ftrace_regs_caller. Only that one will write out
  a complete pt_regs, for efficiency.

* Replace the use of X19 with X28 to remember the old PC during
  live patch detection, as only that is saved&restored now for
  non-regs ftrace.

* CONFIG_DYNAMIC_FTRACE_WITH_REGS and CC_USING_PATCHABLE_FUNCTION_ENTRY
  are currently synonymous on arm64, but differentiate better for
  the future when this is no longer the case.

* Clean up "old"/"new" insn value setting vs. #ifdefs.

* #define a INSN_MOV_X9_X30 with suggested aarch64_insn_gen call
  and use that instead of an immediate hex value.

	Torsten