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kexec: add config option for KHO

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We have all generic code in place now to support Kexec with KHO.  This
patch adds a config option that depends on architecture support to enable
KHO support.

Link: https://lkml.kernel.org/r/20250509074635.3187114-9-changyuanl@google.com
Signed-off-by: Alexander Graf <graf@amazon.com>
Co-developed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Signed-off-by: Changyuan Lyu <changyuanl@google.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Anthony Yznaga <anthony.yznaga@oracle.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Ashish Kalra <ashish.kalra@amd.com>
Cc: Ben Herrenschmidt <benh@kernel.crashing.org>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Woodhouse <dwmw2@infradead.org>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Gowans <jgowans@amazon.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Krzysztof Kozlowski <krzk@kernel.org>
Cc: Marc Rutland <mark.rutland@arm.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Pratyush Yadav <ptyadav@amazon.de>
Cc: Rob Herring <robh@kernel.org>
Cc: Saravana Kannan <saravanak@google.com>
Cc: Stanislav Kinsburskii <skinsburskii@linux.microsoft.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Lendacky <thomas.lendacky@amd.com>
Cc: Will Deacon <will@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Alexander Graf 2025-05-09 00:46:26 -07:00 committed by Andrew Morton
parent 3bdecc3c93
commit 4e1d010e3b
1 changed files with 14 additions and 0 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

14
kernel/Kconfig.kexec
View file

@ -95,6 +95,20 @@ config KEXEC_JUMP
Jump between original kernel and kexeced kernel and invoke Jump between original kernel and kexeced kernel and invoke
code in physical address mode via KEXEC code in physical address mode via KEXEC
config KEXEC_HANDOVER
bool "kexec handover"
depends on ARCH_SUPPORTS_KEXEC_HANDOVER && ARCH_SUPPORTS_KEXEC_FILE
select MEMBLOCK_KHO_SCRATCH
select KEXEC_FILE
select DEBUG_FS
select LIBFDT
select CMA
help
Allow kexec to hand over state across kernels by generating and
passing additional metadata to the target kernel. This is useful
to keep data or state alive across the kexec. For this to work,
both source and target kernels need to have this option enabled.
config CRASH_DUMP config CRASH_DUMP
bool "kernel crash dumps" bool "kernel crash dumps"
default ARCH_DEFAULT_CRASH_DUMP default ARCH_DEFAULT_CRASH_DUMP