Samuel Holland <samuel.holland@sifive.com> says:

This series aims to improve support for NOMMU, specifically by making it
easier to test NOMMU kernels in QEMU and on various widely-available
hardware (errata permitting). After all, everything supports Svbare...

After applying this series, a NOMMU kernel based on defconfig (changing
only the three options below*) boots to userspace on QEMU when passed as
-kernel.

  # CONFIG_RISCV_M_MODE is not set
  # CONFIG_MMU is not set
  CONFIG_NONPORTABLE=y

*if you are using LLD, you must also disable BPF_SYSCALL and KALLSYMS,
because LLD bails on out-of-range references to undefined weak symbols.

* b4-shazam-merge:
  riscv: Allow NOMMU kernels to run in S-mode
  riscv: Remove MMU dependency from Zbb and Zicboz
  riscv: Fix loading 64-bit NOMMU kernels past the start of RAM
  riscv: Fix TASK_SIZE on 64-bit NOMMU

Link: https://lore.kernel.org/r/20240227003630.3634533-1-samuel.holland@sifive.comSigned-off-by: Palmer Dabbelt <palmer@rivosinc.com>