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Message-ID: <CA+7dDtL=bNCSWOTet8NLqOaceaNKQaPaw-cKEFbW2gh6wFeb7g@mail.gmail.com>
Date: Tue, 27 Jun 2023 14:07:08 -0700
From: Charlie Jenkins <charlie@...osinc.com>
To: Conor Dooley <conor@...nel.org>
Cc: Jonathan Corbet <corbet@....net>,
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<linux-kselftest@...r.kernel.org>,
Atish Kumar Patra <atishp@...osinc.com>
Subject: Re: [PATCH 0/2] Restrict address space for sv39,sv48,sv57
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 PM Charles Jenkins <charlie@...osinc.com> 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 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
> > >
> >
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