linux-kernel - [PATCH v4 0/4] RISC-V: mm: Make SV48 the default address space

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Message-ID: <20230708011156.2697409-1-charlie@rivosinc.com>
Date:   Fri,  7 Jul 2023 18:11:31 -0700
From:   Charlie Jenkins <charlie@...osinc.com>
To:     linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     charlie@...osinc.com, conor@...nel.org, paul.walmsley@...ive.com,
        palmer@...osinc.com, aou@...s.berkeley.edu, anup@...infault.org,
        konstantin@...uxfoundation.org, linux-doc@...r.kernel.org,
        linux-kselftest@...r.kernel.org, linux-mm@...ck.org,
        mick@....forth.gr, jrtc27@...c27.com, rdunlap@...radead.org
Subject: [PATCH v4 0/4] RISC-V: mm: Make SV48 the default address space

Make sv48 the default address space for mmap as some applications
currently depend on this assumption. Also enable users to select
desired address space using a non-zero hint address to mmap. Previous
kernel changes caused Java and other applications to be broken on sv57
which this patch fixes.

Documentation is also added to the RISC-V virtual memory section to explain
these changes.

-Charlie

---
v4:
- Split testcases/document patch into test cases, in-code documentation, and
  formal documentation patches
- Modified the mmap_base macro to be more legible and better represent memory
  layout
- Fixed documentation to better reflect the implmentation
- Renamed DEFAULT_VA_BITS to MMAP_VA_BITS
- Added additional test case for rlimit changes
---

Charlie Jenkins (4):
  RISC-V: mm: Restrict address space for sv39,sv48,sv57
  RISC-V: mm: Add tests for RISC-V mm
  RISC-V: mm: Update pgtable comment documentation
  RISC-V: mm: Document mmap changes

 Documentation/riscv/vm-layout.rst             |  22 +++
 arch/riscv/include/asm/elf.h                  |   2 +-
 arch/riscv/include/asm/pgtable.h              |  21 ++-
 arch/riscv/include/asm/processor.h            |  43 +++++-
 tools/testing/selftests/riscv/Makefile        |   2 +-
 tools/testing/selftests/riscv/mm/.gitignore   |   1 +
 tools/testing/selftests/riscv/mm/Makefile     |  21 +++
 .../selftests/riscv/mm/testcases/mmap.c       | 133 ++++++++++++++++++
 8 files changed, 232 insertions(+), 13 deletions(-)
 create mode 100644 tools/testing/selftests/riscv/mm/.gitignore
 create mode 100644 tools/testing/selftests/riscv/mm/Makefile
 create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap.c

-- 
2.41.0