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

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Date:   Tue, 27 Jun 2023 19:24:39 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Charlie Jenkins <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>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        "open list:RISC-V ARCHITECTURE" <linux-riscv@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:EXEC & BINFMT API" <linux-mm@...ck.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@...r.kernel.org>
Subject: Re: [PATCH 0/2] Restrict address space for sv39,sv48,sv57

Hey Charlie,

On Mon, Jun 26, 2023 at 11:36:02AM -0700, Charlie Jenkins wrote:
> 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.

I don't know what went wrong here, but this never ended up in patchwork
for some reason, although it has appeared on lore. That seems to be via
the docs mailing list, rather than linux-riscv. Could you speak to Atish
and see if he knows what went wrong?

Cheers,
Conor.

> 
> 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
> 

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