arm64: Implement HAVE_LIVEPATCH

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Allocate a task flag used to represent the patch pending state for the
task. When a livepatch is being loaded or unloaded, the livepatch code
uses this flag to select the proper version of a being patched kernel
functions to use for current task.

In arch/arm64/Kconfig, select HAVE_LIVEPATCH and include proper Kconfig.

This is largely based on [1] by Suraj Jitindar Singh.

[1] https://lore.kernel.org/all/20210604235930.603-1-surajjs@amazon.com/

Cc: Suraj Jitindar Singh <surajjs@amazon.com>
Cc: Torsten Duwe <duwe@suse.de>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Tested-by: Breno Leitao <leitao@debian.org>
Tested-by: Andrea della Porta <andrea.porta@suse.com>
Signed-off-by: Song Liu <song@kernel.org>
Acked-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20250630174502.842486-1-song@kernel.org
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

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Song Liu 2025-06-30 10:45:02 -07:00 • committed by Catalin Marinas

parent 805f13e403

commit fd1e0fd71f

3 changed files with 11 additions and 1 deletions

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3

arch/arm64/Kconfig

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5

arch/arm64/include/asm/thread_info.h

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4

arch/arm64/kernel/entry-common.c

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