[PATCH v4 0/2] kdump: Enable LUKS-encrypted dump target support in ARM64 and PowerPC

[Coiby Xu <coxu@redhat.com>]

CONFIG_CRASH_DM_CRYPT has been introduced to support LUKS-encrypted
device dump target by addressing two challenges [1],
 - Kdump kernel may not be able to decrypt the LUKS partition. For some
   machines, a system administrator may not have a chance to enter the
   password to decrypt the device in kdump initramfs after the 1st kernel
   crashes

 - LUKS2 by default use the memory-hard Argon2 key derivation function
   which is quite memory-consuming compared to the limited memory reserved
   for kdump.

To also enable this feature for ARM64 and PowerPC, we only need to add a
device tree property dmcryptkeys [2] as similar to elfcorehdr to pass the
memory address of the stored info of dm-crypt keys to the kdump kernel.

[1] https://lore.kernel.org/all/20250502011246.99238-1-coxu@redhat.com/
[2] https://github.com/devicetree-org/dt-schema/pull/181


v4
- Make arch-specific code more succinct by printing more logs in
  arch-independent code [Will Deacon]  

- Also use device tree for PowerPC to pass memory address of dm-crypt
  keys info
  - powerpc v2 patch that passes the dmcryptkeys kernel cmdline
    parameter:
    https://lore.kernel.org/all/20260106074039.564707-1-coxu@redhat.com/

v3
- Delete the property after reading it [Rob Herring]

v2
- Krzysztof
  - Use imperative mood for commit message
  - Add dt-schema ABI Documentation 
    https://github.com/devicetree-org/dt-schema/pull/181
- Don't print dm-crypt keys address via pr_debug

Coiby Xu (2):
  crash_dump/dm-crypt: Don't print in arch-specific code
  arm64,ppc64le/kdump: pass dm-crypt keys to kdump kernel

 arch/arm64/kernel/machine_kexec_file.c |  4 ++++
 arch/powerpc/kexec/elf_64.c            |  4 ++++
 arch/x86/kernel/kexec-bzimage64.c      |  6 +-----
 drivers/of/fdt.c                       | 21 +++++++++++++++++++++
 drivers/of/kexec.c                     | 19 +++++++++++++++++++
 kernel/crash_dump_dm_crypt.c           |  7 +++++--
 6 files changed, 54 insertions(+), 7 deletions(-)


base-commit: 2619c62b7ef2f463bcbbb34af122689c09855c23
-- 
2.53.0