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

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Message-ID: <CA+7dDtKARX35pcgdKopuM6c8oj+TKLRhXcF0+d4MZE51V7Bifg@mail.gmail.com>
Date:   Tue, 27 Jun 2023 13:44:18 -0700
From:   Charles Jenkins <charlie@...osinc.com>
To:     Conor Dooley <conor@...nel.org>
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>,
        Atish Kumar Patra <atishp@...osinc.com>
Subject: Re: [PATCH 0/2] Restrict address space for sv39,sv48,sv57

I talked to Atish, he's not sure what's going on here either. I am going
to add him to the CC list.

On Tue, Jun 27, 2023 at 11:24 AM Conor Dooley <conor@...nel.org> wrote:

> 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
> > 
>