linux-kernel - Re: [PATCH v2 0/5] Add kexec

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Message-ID: <CAAhV-H75tsJkHC9DgCOOBbFjbK--B_LRRCP5PcZr6nHqwKHL1Q@mail.gmail.com>
Date: Fri, 22 Aug 2025 12:13:24 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Youling Tang <youling.tang@...ux.dev>
Cc: WANG Xuerui <kernel@...0n.name>, Baoquan He <bhe@...hat.com>, Yao Zi <ziyao@...root.org>, 
	kexec@...ts.infradead.org, loongarch@...ts.linux.dev, 
	linux-kernel@...r.kernel.org, Youling Tang <tangyouling@...inos.cn>
Subject: Re: [PATCH v2 0/5] Add kexec_file support for LoongArch

Hi, Youling,

On Wed, Aug 20, 2025 at 1:57 PM Youling Tang <youling.tang@...ux.dev> wrote:
>
> From: Youling Tang <tangyouling@...inos.cn>
>
> This patchset implement kexec_file_load() support on LoongArch.
>
> This patch series enables us to load the LoongArch vmlinuz.efi(pez) or
> vmlinux.efi(pei) or vmlinux(elf) by specifying its file decriptor,
> instead of user-filled buffer via kexec_load() syscall.
>
> To use kexec_file_load() system call, instead of kexec_load(), at kexec
> command, '-s' options must be specified. kexec-tools needs to apply the
> corresponding patches. These patches can be found in repository [1] and
> will be submitted to the kexec-tools community later.
>
> The basic usage of kexec_file is:
> 1) Load second kernel image:
>  # kexec -s -l vmlinuz.efi --initrd=initrd.img --reuse-cmdline
>
> 2) Startup second kernel:
>  # kexec -e
>
> For kdump:
> 1) Load capture kernel image:
>  # kexec -s -p vmlinuz.efi --initrd=initrd.img --reuse-cmdline
>
> 2) Do something to crash, like:
>  # echo c > /proc/sysrq-trigger
>
> Link:
> [1] https://github.com/tangyouling/kexec-tools/commits/main/
>
> Changelog:
>  v2:
>  * Merge some patches.
>  * Add support for ELF format images.
>  * Rename kexec_image.c to kexec_efi.c .
>  * When KEXEC_FILE is enabled, RELOCATABLE is selected by default.
>  * Some minor modifications.
>
> Youling Tang (5):
>   LoongArch: Add struct loongarch_image_header for kernel image
>   LoongArch: Add kexec_file support
>   LoongArch/kexec_file: Support loading ELF binary file
I prefer to combine Patch-2 and Patch-3. :)

Huacai

>   LoongArch/kexec_file: Add crash dump support
>   LoongArch: Enable CONFIG_KEXEC_FILE
>
>  arch/loongarch/Kconfig                     |  10 +
>  arch/loongarch/configs/loongson3_defconfig |   1 +
>  arch/loongarch/include/asm/image.h         |  57 +++++
>  arch/loongarch/include/asm/kexec.h         |  13 ++
>  arch/loongarch/kernel/Makefile             |   1 +
>  arch/loongarch/kernel/kexec_efi.c          | 111 ++++++++++
>  arch/loongarch/kernel/kexec_elf.c          | 105 +++++++++
>  arch/loongarch/kernel/machine_kexec.c      |  33 ++-
>  arch/loongarch/kernel/machine_kexec_file.c | 235 +++++++++++++++++++++
>  9 files changed, 555 insertions(+), 11 deletions(-)
>  create mode 100644 arch/loongarch/include/asm/image.h
>  create mode 100644 arch/loongarch/kernel/kexec_efi.c
>  create mode 100644 arch/loongarch/kernel/kexec_elf.c
>  create mode 100644 arch/loongarch/kernel/machine_kexec_file.c
>
> --
> 2.43.0
>