linux-kernel - Re: [PATCH v4 0/7] Add kexec

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Message-ID: <CAAhV-H5LnRruyzdxR26Sopot4HoAwsGJ=kQKr4D=gRmW4t1R0Q@mail.gmail.com>
Date: Sun, 21 Sep 2025 22:03:19 +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 v4 0/7] Add kexec_file support for LoongArch

Applied with some modifications. You may need to test whether everything is OK.
https://github.com/chenhuacai/linux/commits/loongarch-next

Huacai

On Wed, Sep 3, 2025 at 11:02 AM 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:
>  v4:
>  * Add the character "kexec_file" to the command-line parameter.
>  * Fixed the issue where kexec_file failed to load the KASLR kernel
>    startup.
>  * Modify the member name of the loongarch_image_header structure.
>  * Modify the patch commit message.
>
>  v3:
>  * The ELF format kernel loading should not use loongarch_image_header.
>  * Separate patch2 into an infrastructure patch and an EFI support
>    patch.
>  * Adding that kexec_file cannot load non-relocation kernel comments.
>  * Some minor modifications.
>
>  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 (7):
>   LoongArch: Add struct loongarch_image_header for kernel image
>   LoongArch: Add preparatory infrastructure for kexec_file
>   LoongArch/kexec_file: Support loading EFI binary file
>   LoongArch/kexec_file: Support loading ELF binary file
>   LoongArch/kexec_file: Add crash dump support
>   LoongArch: Automatically disable kaslr when the kernel loads from
>     kexec_file
>   LoongArch: Enable CONFIG_KEXEC_FILE
>
>  arch/loongarch/Kconfig                     |  10 +
>  arch/loongarch/configs/loongson3_defconfig |   1 +
>  arch/loongarch/include/asm/image.h         |  53 +++++
>  arch/loongarch/include/asm/kexec.h         |  13 ++
>  arch/loongarch/kernel/Makefile             |   1 +
>  arch/loongarch/kernel/kexec_efi.c          | 114 ++++++++++
>  arch/loongarch/kernel/kexec_elf.c          | 105 +++++++++
>  arch/loongarch/kernel/machine_kexec.c      |  37 ++--
>  arch/loongarch/kernel/machine_kexec_file.c | 244 +++++++++++++++++++++
>  arch/loongarch/kernel/relocate.c           |   4 +
>  10 files changed, 569 insertions(+), 13 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
>