Hi Youling, On Mon, Aug 11, 2025 at 2:28 AM Youling Tang <[email protected]> wrote: > > From: Youling Tang <[email protected]> > > This patchset implement kexec_file_load() support on LoongArch. > > This patch series enables us to load the LoongArch vmlinuz.efi or > vmlinux.efi 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 >
I am new to this feature but I am interested to test this feature, How do I get the second kernel or capture image vmlinux.efi and initrd.img, do I need to build them separately and how? > Link: > [1] https://github.com/tangyouling/kexec-tools/commits/main/ > > Youling Tang (6): > LoongArch: Add struct loongarch_image_header for kernel image > LoongArch: Add kexec_file support > LoongArch/kexec_file: Add initrd loading > LoongArch/kexec_file: Add crash dump support > LoongArch/kexec_file: Add "mem" parameter to limit memory usage of > kdump kernel > LoongArch: Enable CONFIG_KEXEC_FILE > > arch/loongarch/Kconfig | 8 + > arch/loongarch/configs/loongson3_defconfig | 1 + > arch/loongarch/include/asm/image.h | 58 +++++ > arch/loongarch/include/asm/kexec.h | 12 ++ > arch/loongarch/kernel/Makefile | 1 + > arch/loongarch/kernel/kexec_image.c | 112 ++++++++++ > arch/loongarch/kernel/machine_kexec.c | 33 ++- > arch/loongarch/kernel/machine_kexec_file.c | 234 +++++++++++++++++++++ > 8 files changed, 448 insertions(+), 11 deletions(-) > create mode 100644 arch/loongarch/include/asm/image.h > create mode 100644 arch/loongarch/kernel/kexec_image.c > create mode 100644 arch/loongarch/kernel/machine_kexec_file.c > > -- > 2.34.1 > >
