linux-kernel - Re: [PATCH v3 0/2] arm64: livepatch: Enable livepatch without sframe

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Message-ID: <aCtfAcg32kbczs-g@J2N7QTR9R3>
Date: Mon, 19 May 2025 17:40:33 +0100
From: Mark Rutland <mark.rutland@....com>
To: Song Liu <song@...nel.org>
Cc: Petr Mladek <pmladek@...e.com>, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-toolchains@...r.kernel.org,
	live-patching@...r.kernel.org, indu.bhagat@...cle.com,
	puranjay@...nel.org, wnliu@...gle.com, irogers@...gle.com,
	joe.lawrence@...hat.com, jpoimboe@...nel.org, peterz@...radead.org,
	roman.gushchin@...ux.dev, rostedt@...dmis.org, will@...nel.org,
	kernel-team@...a.com
Subject: Re: [PATCH v3 0/2] arm64: livepatch: Enable livepatch without sframe

On Fri, May 16, 2025 at 09:53:36AM -0700, Song Liu wrote:
> ARM folks, please share your thoughts on this work. To fully support
> livepatching of kernel modules, we also need [1]. We hope we can
> land this in the 6.16 kernel.
> 
> Thanks,
> Song
> 
> [1] https://lore.kernel.org/linux-arm-kernel/20250412010940.1686376-1-dylanbhatch@google.com/

I've had a quick look at [1], and IIUC that's a hard prerequisite for
livepatching, as without it the kernel *will* crash if it attempts a
late module relocation.

Given that, I don't think that we can take patch 2 until Will's comments
on [1] have been addressed, but I think that we could take patch 1 (with
fixups) as per my other reply.

Mark.