arm64/riscv: Add support for crashkernel CMA reservation
| From: | Jinjie Ruan <ruanjinjie-AT-huawei.com> | |
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| Subject: | [PATCH v11 00/11] arm64/riscv: Add support for crashkernel CMA reservation | |
| Date: | Sat, 28 Mar 2026 15:40:02 +0800 | |
| Message-ID: | <20260328074013.3589544-1-ruanjinjie@huawei.com> | |
| Cc: | <ruanjinjie-AT-huawei.com> | |
| Archive-link: | Article |
The crash memory allocation, and the exclude of crashk_res, crashk_low_res and crashk_cma memory are almost identical across different architectures, This patch set handle them in crash core in a general way, which eliminate a lot of duplication code. And add support for crashkernel CMA reservation for arm64 and riscv. Rebased on v7.0-rc1. Basic second kernel boot test were performed on QEMU platforms for x86, ARM64, and RISC-V architectures with the following parameters: >-------"cma=256M crashkernel=256M crashkernel=64M,cma" Changes in v11: - Avoid silently drop crash memory if the crash kernel is built without CONFIG_CMA. - Remove unnecessary "cmem->nr_ranges = 0" for arch_crash_populate_cmem() as we use kvzalloc(). - Provide a separate patch for each architecture to fix the existing buffer overflow issue. - Add Acked-bys for arm64. Changes in v10: - Fix crashk_low_res not excluded bug in the existing RISC-V code. - Fix an existing memory leak issue in the existing PowerPC code. - Fix the ordering issue of adding CMA ranges to "linux,usable-memory-range". - Fix an existing concurrency issue. A Concurrent memory hotplug may occur between reading memblock and attempting to fill cmem during kexec_load() for almost all existing architectures. - Link to v9: https://lore.kernel.org/all/20260323072745.2481719-1-ruan... Changes in v9: - Collect Reviewed-by and Acked-by, and prepare for Sashiko AI review. - Link to v8: https://lore.kernel.org/all/20260302035315.3892241-1-ruan... Changes in v8: - Fix the build issues reported by kernel test robot and Sourabh. - Link to v7: https://lore.kernel.org/all/20260226130437.1867658-1-ruan... Changes in v7: - Correct the inclusion of CMA-reserved ranges for kdump kernel in of/kexec for arm64 and riscv. - Add Acked-by. - Link to v6: https://lore.kernel.org/all/20260224085342.387996-1-ruanj... Changes in v6: - Update the crash core exclude code as Mike suggested. - Rebased on v7.0-rc1. - Add acked-by. - Link to v5: https://lore.kernel.org/all/20260212101001.343158-1-ruanj... Changes in v5: - Fix the kernel test robot build warnings. - Sort crash memory ranges before preparing elfcorehdr for powerpc - Link to v4: https://lore.kernel.org/all/20260209095931.2813152-1-ruan... Changes in v4: - Move the size calculation (and the realloc if needed) into the generic crash. - Link to v3: https://lore.kernel.org/all/20260204093728.1447527-1-ruan... Jinjie Ruan (10): riscv: kexec_file: Fix crashk_low_res not exclude bug powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr() x86/kexec: Fix potential buffer overflow in prepare_elf_headers() arm64: kexec_file: Fix potential buffer overflow in prepare_elf_headers() riscv: kexec_file: Fix potential buffer overflow in prepare_elf_headers() LoongArch: kexec: Fix potential buffer overflow in prepare_elf_headers() crash: Exclude crash kernel memory in crash core crash: Use crash_exclude_core_ranges() on powerpc arm64: kexec: Add support for crashkernel CMA reservation riscv: kexec: Add support for crashkernel CMA reservation Sourabh Jain (1): powerpc/crash: sort crash memory ranges before preparing elfcorehdr .../admin-guide/kernel-parameters.txt | 16 +-- arch/arm64/kernel/machine_kexec_file.c | 43 +++----- arch/arm64/mm/init.c | 5 +- arch/loongarch/kernel/machine_kexec_file.c | 43 +++----- arch/powerpc/include/asm/kexec_ranges.h | 1 - arch/powerpc/kexec/crash.c | 7 +- arch/powerpc/kexec/ranges.c | 101 +----------------- arch/riscv/kernel/machine_kexec_file.c | 42 +++----- arch/riscv/mm/init.c | 5 +- arch/x86/kernel/crash.c | 92 +++------------- drivers/of/fdt.c | 9 +- drivers/of/kexec.c | 9 ++ include/linux/crash_core.h | 9 ++ include/linux/crash_reserve.h | 4 +- kernel/crash_core.c | 89 ++++++++++++++- 15 files changed, 194 insertions(+), 281 deletions(-) -- 2.34.1