linux-kernel - Re: [PATCH v7] arm64/module: Use text-poke API for late relocations.

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Message-ID: <CAPhsuW4o87DA0HM4UHjuAUsYbYkuuwZCo9v5Ht0N=OzRTEqztg@mail.gmail.com>
Date: Mon, 9 Jun 2025 10:59:16 -0700
From: Song Liu <song@...nel.org>
To: Dylan Hatch <dylanbhatch@...gle.com>
Cc: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, 
	Ard Biesheuvel <ardb@...nel.org>, Sami Tolvanen <samitolvanen@...gle.com>, 
	Geert Uytterhoeven <geert@...ux-m68k.org>, linux-arm-kernel@...ts.infradead.org, 
	linux-kernel@...r.kernel.org, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Toshiyuki Sato <fj6611ie@...jp.fujitsu.com>
Subject: Re: [PATCH v7] arm64/module: Use text-poke API for late relocations.

Hi Will and folks,

We (Meta) are hoping to test livepatch arm64 with our kernels soon.
In general, we strongly prefer patches that are already landed in the
subsystem's git tree, and being tested in linux-next.

Could you please help us review and land this set and [1] and [2] so
that we can test them in our kernels?

Thanks,
Song

[1] https://lore.kernel.org/linux-arm-kernel/20250320171559.3423224-1-song@kernel.org/
[2] https://lore.kernel.org/linux-arm-kernel/20250521111000.2237470-2-mark.rutland@arm.com/

On Tue, Jun 3, 2025 at 3:34 PM Dylan Hatch <dylanbhatch@...gle.com> wrote:
>
> To enable late module patching, livepatch modules need to be able to
> apply some of their relocations well after being loaded. In this
> scenario however, the livepatch module text and data is already RX-only,
> so special treatment is needed to make the late relocations possible. To
> do this, use the text-poking API for these late relocations.
>
> This patch is partially based off commit 88fc078a7a8f6 ("x86/module: Use
> text_poke() for late relocations").
>
> Signed-off-by: Dylan Hatch <dylanbhatch@...gle.com>
> Acked-by: Song Liu <song@...nel.org>