linux-kernel - [PATCH 0/4] riscv: 64-bit NOMMU fixes and enhancements

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Message-ID: <20240227003630.3634533-1-samuel.holland@sifive.com>
Date: Mon, 26 Feb 2024 16:34:45 -0800
From: Samuel Holland <samuel.holland@...ive.com>
To: Palmer Dabbelt <palmer@...belt.com>,
	linux-riscv@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org,
	Samuel Holland <samuel.holland@...ive.com>
Subject: [PATCH 0/4] riscv: 64-bit NOMMU fixes and enhancements

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.


Samuel Holland (4):
  riscv: Fix TASK_SIZE on 64-bit NOMMU
  riscv: Fix loading 64-bit NOMMU kernels past the start of RAM
  riscv: Remove MMU dependency from Zbb and Zicboz
  riscv: Allow NOMMU kernels to run in S-mode

 arch/riscv/Kconfig               | 17 ++++++++++-------
 arch/riscv/include/asm/page.h    |  2 +-
 arch/riscv/include/asm/pgtable.h |  2 +-
 arch/riscv/mm/init.c             |  2 +-
 4 files changed, 13 insertions(+), 10 deletions(-)

-- 
2.43.0