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.
Also add support for arm64 crash hotplug.
This patch set is rebased on v7.1-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=4G crashkernel=64M,cma"
For first kernel, there will be such log:
# dmesg | grep crash
[ 0.000000] crashkernel low memory reserved: 0xe8000000 - 0xf0000000
(128 MB)
[ 0.000000] crashkernel reserved: 0x000000023e600000 -
0x000000033e600000 (4096 MB)
[ 0.000000] crashkernel CMA reserved: 64 MB in 1 ranges
# dmesg | grep cma
[ 0.000000] cma: Reserved 256 MiB at 0x00000000f0000000
[ 0.000000] cma: Reserved 64 MiB at 0x0000000100000000
For second kernel, there will be such log:
[ 0.000000] OF: fdt: Looking for usable-memory-range property...
[ 0.000000] OF: fdt: cap_mem_regions[0]: base=0x000000023e600000,
size=0x0000000100000000
[ 0.000000] OF: fdt: cap_mem_regions[1]: base=0x00000000e8000000,
size=0x0000000008000000
[ 0.000000] OF: fdt: cap_mem_regions[2]: base=0x0000000100000000,
size=0x0000000004000000
Changes in v14:
- Fix image->elf_headers memory leak during retry loop for arm64 as Sashiko
AI code review pointed out.
- Solve the hotplug notifier arch_crash_handle_hotplug_event() AA
self-deadlock problem as Sashiko AI code review pointed out.
- Fix the TOCTOU issue in prepare_elf_headers() by get_online_mems().
- -ENOMEM -> -EAGAIN as Breno suggested.
- Add support for arm64 crash hotplug.
- Link to v13:
https://lore.kernel.org/all/[email protected]/
Changes in v13:
- Rebased on v7.1-rc1.
- Update the commit message.
- Add Reviewed-by.
- Link to v12:
https://lore.kernel.org/all/[email protected]/
Changes in v12:
- Remove the unused "nr_mem_ranges" for x86.
- Add "Fix crashk_low_res not exclude bug" test log.
- Provide a separate patch for each architecture for using
crash_prepare_headers(), which will make the review more convenient.
- Add Reviewed-by and Tested-by.
- Link to v11:
https://lore.kernel.org/all/[email protected]/
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/[email protected]/
Changes in v9:
- Collect Reviewed-by and Acked-by, and prepare for Sashiko AI review.
- Link to v8:
https://lore.kernel.org/all/[email protected]/
Changes in v8:
- Fix the build issues reported by kernel test robot and Sourabh.
- Link to v7:
https://lore.kernel.org/all/[email protected]/
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/[email protected]/
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/[email protected]/
Jinjie Ruan (16):
riscv: kexec_file: Fix crashk_low_res not exclude bug
powerpc/crash: Fix possible memory leak in update_crash_elfcorehdr()
arm64: kexec: Fix image->elf_headers memory leak during retry loop
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: Add crash_prepare_headers() to exclude crash kernel memory
arm64: kexec_file: Use crash_prepare_headers() helper to simplify code
x86/kexec: Use crash_prepare_headers() helper to simplify code
riscv: kexec_file: Use crash_prepare_headers() helper to simplify code
LoongArch: kexec: Use crash_prepare_headers() helper to simplify code
crash: Use crash_exclude_core_ranges() on powerpc
arm64: kexec: Add support for crashkernel CMA reservation
riscv: kexec: Add support for crashkernel CMA reservation
arm64/crash: Add crash hotplug support
Sourabh Jain (1):
powerpc/crash: sort crash memory ranges before preparing elfcorehdr
.../admin-guide/kernel-parameters.txt | 16 +--
arch/arm64/Kconfig | 3 +
arch/arm64/include/asm/kexec.h | 14 +-
arch/arm64/kernel/Makefile | 1 +
arch/arm64/kernel/crash.c | 125 ++++++++++++++++++
arch/arm64/kernel/kexec_image.c | 22 ++-
arch/arm64/kernel/machine_kexec_file.c | 78 ++++++-----
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 | 11 ++
include/linux/crash_reserve.h | 4 +-
kernel/crash_core.c | 102 +++++++++++++-
20 files changed, 392 insertions(+), 298 deletions(-)
create mode 100644 arch/arm64/kernel/crash.c
--
2.34.1
