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Message-Id: <20250903030100.196744-1-youling.tang@linux.dev>
Date: Wed, 3 Sep 2025 11:00:53 +0800
From: Youling Tang <youling.tang@...ux.dev>
To: Huacai Chen <chenhuacai@...nel.org>
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@...ux.dev,
Youling Tang <tangyouling@...inos.cn>
Subject: [PATCH v4 0/7] Add kexec_file support for LoongArch
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
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