The primary goal of this patch series is to enable crash hotplug on
powerpc architecture for the `kexec_load` system call.
The first patch in the series introduces a new kexec flag added in the
kernel to generalize crash hotplug support. The second patch enables
crash hotplug support on PowerPC for `kexec_load` system call. The third
patch updates the documentation about crash hotplug support.
Changes log:
v4:
- Do not remove the KEXEC_UPDATE_ELFCOREHDR kexec flag. It is needed to
maintain backward compatibility on x86. 1/3
- Send the KEXEC_UPDATE_ELFCOREHDR kexec flag for x86, and for the rest
of the architectures, send KEXEC_CRASH_HOTPLUG_SUPPORT to enable
crash hotplug support kexec_load system call. 1/3
- Since there is a significant change in 1/3, hence Hari's Acked-by
is removed form only first patch. 1/3
- Rename and reorder the function arch_do_exclude_segment() parameters
as suggested. 1/3
- Keep the implementation of arch_do_exclude_segment() function same
for x86_64 and i386. 1/3
v3:
https://lists.infradead.org/pipermail/kexec/2024-July/030361.html
- Updated --hotplug option description 3/3
v2:
https://lists.infradead.org/pipermail/kexec/2024-June/030309.html
- Find CPUs in the system using the /sys/devices/system/cpu/present sysfs
instead of traversing all nodes under /proc/device-tree/cpus. 2/3
- Added a new function to find present CPUs in the system. 2/3
- Removed unnecessary NULL check on seg_ptr from arch_do_exclude_segment(). 2/3
- Updated --hotplug option description 3/3
v1:
https://lists.infradead.org/pipermail/kexec/2024-May/030051.html
Cc: Aditya Gupta <adityag@xxxxxxxxxxxxx>
Cc: Baoquan He <bhe@xxxxxxxxxx>
Cc: Coiby Xu <coxu@xxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxx>
Cc: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxx>
Cc: Simon Horman <horms@xxxxxxxxxx>
Cc: Sourabh Jain <sourabhjain@xxxxxxxxxxxxx>
Sourabh Jain (3):
kexec_load: Use new kexec flag for hotplug support
powerpc/kexec_load: add hotplug support
doc/hotplug: update man and --help
kexec/arch/arm/kexec-arm.c | 5 +
kexec/arch/arm64/kexec-arm64.c | 5 +
kexec/arch/cris/kexec-cris.c | 4 +
kexec/arch/hppa/kexec-hppa.c | 5 +
kexec/arch/i386/kexec-x86.c | 8 +
kexec/arch/ia64/kexec-ia64.c | 4 +
kexec/arch/loongarch/kexec-loongarch.c | 5 +
kexec/arch/m68k/kexec-m68k.c | 5 +
kexec/arch/mips/kexec-mips.c | 4 +
kexec/arch/ppc/kexec-ppc.c | 4 +
kexec/arch/ppc64/crashdump-ppc64.c | 16 +-
kexec/arch/ppc64/fdt.c | 236 ++++++++++++++++++++++++-
kexec/arch/ppc64/include/arch/fdt.h | 2 +-
kexec/arch/ppc64/kexec-elf-ppc64.c | 2 +-
kexec/arch/ppc64/kexec-ppc64.c | 12 ++
kexec/arch/s390/kexec-s390.c | 5 +
kexec/arch/sh/kexec-sh.c | 5 +
kexec/arch/x86_64/kexec-x86_64.c | 8 +
kexec/kexec-syscall.h | 1 +
kexec/kexec.8 | 8 +-
kexec/kexec.c | 44 ++++-
kexec/kexec.h | 2 +
22 files changed, 373 insertions(+), 17 deletions(-)
--
2.45.1
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