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From:   Charlie Jenkins <charlie@rivosinc.com>
Date:   Tue, 27 Jun 2023 14:07:08 -0700
Message-ID: <CA+7dDtL=bNCSWOTet8NLqOaceaNKQaPaw-cKEFbW2gh6wFeb7g@mail.gmail.com>
Subject: Re: [PATCH 0/2] Restrict address space for sv39,sv48,sv57
To:     Conor Dooley <conor@kernel.org>
Cc:     Jonathan Corbet <corbet@lwn.net>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        Eric Biederman <ebiederm@xmission.com>,
        Kees Cook <keescook@chromium.org>,
        Shuah Khan <shuah@kernel.org>,
        Alexandre Ghiti <alexghiti@rivosinc.com>,
        =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn@rivosinc.com>,
        Conor Dooley <conor.dooley@microchip.com>,
        Greentime Hu <greentime.hu@sifive.com>,
        Zong Li <zong.li@sifive.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Guo Ren <guoren@kernel.org>,
        Andrew Jones <ajones@ventanamicro.com>,
        Sergey Matyukevich <sergey.matyukevich@syntacore.com>,
        David Hildenbrand <david@redhat.com>,
        Mayuresh Chitale <mchitale@ventanamicro.com>,
        Qinglin Pan <panqinglin2020@iscas.ac.cn>,
        Anshuman Khandual <anshuman.khandual@arm.com>,
        Huacai Chen <chenhuacai@kernel.org>,
        Brian Cain <bcain@quicinc.com>,
        "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>,
        Geert Uytterhoeven <geert@linux-m68k.org>,
        Stafford Horne <shorne@gmail.com>,
        Kefeng Wang <wangkefeng.wang@huawei.com>,
        Anup Patel <anup@brainfault.org>,
        Sunil V L <sunilvl@ventanamicro.com>,
        Evan Green <evan@rivosinc.com>,
        Guillaume Tucker <guillaume.tucker@collabora.com>,
        Mark Brown <broonie@kernel.org>,
        Nick Desaulniers <ndesaulniers@google.com>,
        "open list:DOCUMENTATION" <linux-doc@vger.kernel.org>,
        "open list:RISC-V ARCHITECTURE" <linux-riscv@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>,
        "open list:EXEC & BINFMT API" <linux-mm@kvack.org>,
        "open list:KERNEL SELFTEST FRAMEWORK" 
        <linux-kselftest@vger.kernel.org>,
        Atish Kumar Patra <atishp@rivosinc.com>
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I see it in patchwork here:
https://patchwork.kernel.org/project/linux-mm/cover/20230626183611.40479-1-=
charlie@rivosinc.com/.

On Tue, Jun 27, 2023 at 1:44=E2=80=AFPM Charles Jenkins <charlie@rivosinc.c=
om> wrote:
>
> 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=E2=80=AFAM Conor Dooley <conor@kernel.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 enforce=
s
> > > 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 addre=
ss
> > > space that fits entirely into the hint to be used. If the hint is les=
s
> > > than or equal to 1<<38, a 39-bit address will be used. After an addre=
ss
> > > space is completely full, the next smallest address space will be use=
d.
> > >
> > > 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 Atis=
h
> > 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
> > >
> >