[PATCH v2 0/4] kexec-tools RISC-V port

[Nick Kossifidis]

On 4/22/25 19:22, Björn Töpel wrote:
> From: Björn Töpel <bjorn at rivosinc.com>
> 
> Hi!
> 
> *Patch history*
> 
> v1: https://lore.kernel.org/kexec/20250409201428.648717-1-bjorn@kernel.org/
> v2: Added Github Actions support for riscv64 (Simon)
>      Sorted filenames in Makefile (Simon)
>      Added missing dist files (Simon)
>      Fixed mips build (Simon)
> 
> Here's a passed CI run with this series on master:
> https://github.com/bjoto/kexec-tools/actions/runs/14597988952/job/40948715214
> 
> 
> *Cover*
> 
> This is an attempt to finally get the RISC-V patches for kexec-tools
> upstream.
> 
> Simon suggested in [1] that:
> 
>> In my mind the big question is how to move RISC-V support from that
>> branch, to being merged into main.
>>
>> IIRC there were some issues that needed to be addressed. Perhaps they
>> are all addressed by this series, and with some appropriate squashing
>> we can move forwards with a series based on main?
> 
> I talked to Nick last week, and he suggested that we'd work the RISC-V
> collab Github [2], but I think it's just easier to do it on the list.
> 
> I've been collecting a number of different trees out there, and tried
> to group them in a series.
> 
> Given that there is not support for RISC-V upstream yet, I didn't see
> the need to carry all the fixes/updates ("development history") as
> separate commits -- it doesn't help bugtracking/bisectability.
> 
> Instead the first commit message is a big one, and tries to give
> attribution to all involved parties. Input/thoughts are very much
> welcome!
> 
> To properly test this on RISC-V, the upstream Linux kernel has most
> things in 6.15-rc1, e.g.:
> commit 28093cfef5dd ("riscv/kexec_file: Handle R_RISCV_64 in purgatory relocator")
> commit 3f7023171df4 ("riscv/purgatory: 4B align purgatory_start")
> 
> To cross-build kexec-tools:
>    | ./bootstrap
>    | ./configure --host=riscv64-linux-gnu
>    | make
> 
> For some tests, additional kernel patches are needed, that as of today
> is not in 6.15-rc1:
>   * To test "kexec -s -l Image", kexec_file_load with Image support is
>     needed [3]
>   * To test "kexec -c -l vmlinux" with CONFIG_RELOCATABLE, a kbuild fix
>     is needed [4]
>   * Typically if you load initrd, or a large kernel [5] (since a bunch
>     of Reserved regions are not properly exposed).
> 
> I've tested combinations with crashkernel (-p), and regular (-c/-s + -e) for:
>   * ACPI/UEFI
>   * DT/UEFI
>   * DT
>   * w/ initrd
>   * w/o initrd
>   * ELF (userland loader + kexec_load, and kexec_file_load)
>   * Image (userland loader + kexec_load, and kexec_file_load)
> 
> I'm sure there are combinations I've missed, but at least from my POV
> we're in a pretty good shape.
> 
> All authors: Please let me know if you prefer another split of the
> patches. Or something else for that matter! ;-)
> 
> 
> Let's get the ball rolling!
> Björn
> 
> [1] https://lore.kernel.org/kexec/20230920115634.GG224399@kernel.org/
> [2] https://github.com/riscv-collab/kexec-tools.git
> [3] https://lore.kernel.org/linux-riscv/20250409193004.643839-1-bjorn@kernel.org/
> [4] https://lore.kernel.org/linux-riscv/20250408072851.90275-1-alexghiti@rivosinc.com/
> [5] https://lore.kernel.org/linux-riscv/20250409182129.634415-1-bjorn@kernel.org/
> 
> Li Zhengyu (1):
>    RISC-V: Enable kexec_file_load syscall
> 
> Nick Kossifidis (1):
>    RISC-V: Add support for riscv kexec/kdump on kexec-tools
> 
> Song Shuai (2):
>    RISC-V: Separate elf_riscv_find_pbase out
>    RISC-V: Support loading Image binary file
> 
>   .github/workflows/build.yml             |   1 +
>   configure.ac                            |   3 +
>   include/elf.h                           |   1 +
>   kexec/Makefile                          |   1 +
>   kexec/arch/mips/Makefile                |   2 +
>   kexec/arch/riscv/Makefile               |  38 ++
>   kexec/arch/riscv/crashdump-riscv.c      | 140 +++++++
>   kexec/arch/riscv/image-header.h         |  88 ++++
>   kexec/arch/riscv/include/arch/options.h |  43 ++
>   kexec/arch/riscv/iomem.h                |  10 +
>   kexec/arch/riscv/kexec-elf-riscv.c      | 184 +++++++++
>   kexec/arch/riscv/kexec-image-riscv.c    |  95 +++++
>   kexec/arch/riscv/kexec-riscv.c          | 526 ++++++++++++++++++++++++
>   kexec/arch/riscv/kexec-riscv.h          |  53 +++
>   kexec/dt-ops.c                          | 442 +++++++++++++++++++-
>   kexec/dt-ops.h                          |   7 +
>   kexec/kexec-syscall.h                   |   7 +
>   purgatory/Makefile                      |   1 +
>   purgatory/arch/riscv/Makefile           |   7 +
>   19 files changed, 1648 insertions(+), 1 deletion(-)
>   create mode 100644 kexec/arch/riscv/Makefile
>   create mode 100644 kexec/arch/riscv/crashdump-riscv.c
>   create mode 100644 kexec/arch/riscv/image-header.h
>   create mode 100644 kexec/arch/riscv/include/arch/options.h
>   create mode 100644 kexec/arch/riscv/iomem.h
>   create mode 100644 kexec/arch/riscv/kexec-elf-riscv.c
>   create mode 100644 kexec/arch/riscv/kexec-image-riscv.c
>   create mode 100644 kexec/arch/riscv/kexec-riscv.c
>   create mode 100644 kexec/arch/riscv/kexec-riscv.h
>   create mode 100644 purgatory/arch/riscv/Makefile
> 
> 
> base-commit: 14f48ea80e510e5af79ca6c46fa28e99a3695d1c


Thanks for doing this :-)

Regards,
Nick