Merge patch series "riscv: kexec_file: Support loading Image binary file"

Björn Töpel <bjorn@kernel.org> says:

From: Björn Töpel <bjorn@rivosinc.com>

Hi!

For over a year ago, Daniel and I was testing the V2 of Song's series.
I also promised to take the V2, that had been sitting on the lists for
too long, to rebase it on a new kernel, and re-test it.

One year later, here's the V3! ;-)

There are no changes from V2 other, than some simple checkpatch
cleanups.

Song's original cover:
  | This series makes the kexec_file_load() syscall support to load
  | Image binary file. At the same time, corresponding support for
  | kexec-tools had been pushed to my repo[2].
  |
  | Now, we can leverage that kexec-tools and this series to use the
  | kexec_load() or kexec_file_load() syscall to boot both vmlinux and
  | Image file, as seen in these combo tests:
  |
  | ```
  | 1. kexec -l vmlinux
  | 2. kexec -l Image
  | 3. kexec -s -l vmlinux
  | 4. kexec -s -l Image
  | ```

Notably, kexec-tools has still not made it upstream. I've prepared a
branch on my GH [3], that I indend to post ASAP. That branch is a
collection of fixes/features, including Song's userland Image loading.

The V2 is here [2], and V1 [1].

I've tested the kexec-file/Image on qemu-rv64, with following
combinations:
 * ACPI/UEFI
 * DT/UEFI
 * DT

both "regular" kexec (-s + -e), and crashkernels (-p).

Note that there are two purgatory patches that has to be present (part
of -rc1, so all good):
  commit 28093cfef5dd ("riscv/kexec_file: Handle R_RISCV_64 in purgatory relocator")
  commit 3f7023171df4 ("riscv/purgatory: 4B align purgatory_start")

[1] https://lore.kernel.org/linux-riscv/20230914020044.1397356-1-songshuaishuai@tinylab.org/
[2] https://lore.kernel.org/linux-riscv/20231016092006.3347632-1-songshuaishuai@tinylab.org/
[3] https://github.com/bjoto/kexec-tools/tree/rv-on-master

* patches from https://lore.kernel.org/r/20250409193004.643839-1-bjorn@kernel.org:
  riscv: kexec_file: Support loading Image binary file
  riscv: kexec_file: Split the loading of kernel and others

Link: https://lore.kernel.org/r/20250409193004.643839-1-bjorn@kernel.org
Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Signed-off-by: Palmer Dabbelt <palmer@dabbelt.com>