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Tue, 24 Feb 2026 22:03:51 -0800 (PST) From: Coiby Xu To: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linuxppc-dev@lists.ozlabs.org, devicetree@vger.kernel.org Subject: [PATCH v5 0/3] kdump: Enable LUKS-encrypted dump target support in ARM64 and PowerPC Date: Wed, 25 Feb 2026 14:03:43 +0800 Message-ID: <20260225060347.718905-1-coxu@redhat.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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 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 v5 - Improve commit msg [Christophe] - Fix a compiling error found by kernel test robot 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 (3): crash_dump/dm-crypt: Don't print in arch-specific code crash: Align the declaration of crash_load_dm_crypt_keys with CONFIG_CRASH_DM_CRYPT 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 +++++++++++++++++++ include/linux/crash_core.h | 14 +++++++------- kernel/crash_dump_dm_crypt.c | 7 +++++-- 7 files changed, 61 insertions(+), 14 deletions(-) base-commit: 7dff99b354601dd01829e1511711846e04340a69 -- 2.53.0