linux-kernel - [PATCH 0/2] Restrict address space for sv39,sv48,sv57

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Message-Id: <20230626183611.40479-1-charlie@rivosinc.com>
Date:   Mon, 26 Jun 2023 11:36:02 -0700
From:   Charlie Jenkins <charlie@...osinc.com>
To:     charlie@...osinc.com
Cc:     Jonathan Corbet <corbet@....net>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Eric Biederman <ebiederm@...ssion.com>,
        Kees Cook <keescook@...omium.org>,
        Shuah Khan <shuah@...nel.org>,
        Alexandre Ghiti <alexghiti@...osinc.com>,
        Björn Töpel <bjorn@...osinc.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        Greentime Hu <greentime.hu@...ive.com>,
        Zong Li <zong.li@...ive.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Guo Ren <guoren@...nel.org>,
        Andrew Jones <ajones@...tanamicro.com>,
        Sergey Matyukevich <sergey.matyukevich@...tacore.com>,
        David Hildenbrand <david@...hat.com>,
        Mayuresh Chitale <mchitale@...tanamicro.com>,
        Qinglin Pan <panqinglin2020@...as.ac.cn>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Brian Cain <bcain@...cinc.com>,
        "Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Stafford Horne <shorne@...il.com>,
        Kefeng Wang <wangkefeng.wang@...wei.com>,
        Anup Patel <anup@...infault.org>,
        Sunil V L <sunilvl@...tanamicro.com>,
        Evan Green <evan@...osinc.com>,
        Guillaume Tucker <guillaume.tucker@...labora.com>,
        Mark Brown <broonie@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-doc@...r.kernel.org (open list:DOCUMENTATION),
        linux-riscv@...ts.infradead.org (open list:RISC-V ARCHITECTURE),
        linux-kernel@...r.kernel.org (open list),
        linux-mm@...ck.org (open list:EXEC & BINFMT API),
        linux-kselftest@...r.kernel.org (open list:KERNEL SELFTEST FRAMEWORK)
Subject: [PATCH 0/2] Restrict address space for sv39,sv48,sv57

Make sv39 the default address space for mmap as some applications
currently depend on this assumption. The RISC-V specification enforces
that bits outside of the virtual address range are not used, so
restricting the size of the default address space as such should be
temporary. A hint address passed to mmap will cause the largest address
space that fits entirely into the hint to be used. If the hint is less
than or equal to 1<<38, a 39-bit address will be used. After an address
space is completely full, the next smallest address space will be used.

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

Charlie Jenkins (2):
  RISC-V: mm: Restrict address space for sv39,sv48,sv57
  RISC-V: mm: Update documentation and include test

 Documentation/riscv/vm-layout.rst             | 20 ++++++++
 arch/riscv/include/asm/elf.h                  |  2 +-
 arch/riscv/include/asm/pgtable.h              | 21 ++++++--
 arch/riscv/include/asm/processor.h            | 41 +++++++++++++---
 tools/testing/selftests/riscv/Makefile        |  2 +-
 tools/testing/selftests/riscv/mm/Makefile     | 22 +++++++++
 .../selftests/riscv/mm/testcases/mmap.c       | 49 +++++++++++++++++++
 7 files changed, 144 insertions(+), 13 deletions(-)
 create mode 100644 tools/testing/selftests/riscv/mm/Makefile
 create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap.c


base-commit: eef509789cecdce895020682192d32e8bac790e8
-- 
2.34.1