linux-kernel - Re: [PATCH V4 0/3] riscv: mm: Add soft-dirty and uffd-wp support

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Message-ID: <CAAfSe-tDw03TNn7jRWxZfcxyEL=efUURAU6gsWzoanXHAtTLEw@mail.gmail.com>
Date: Thu, 15 Aug 2024 16:54:59 +0800
From: Chunyan Zhang <zhang.lyra@...il.com>
To: Chunyan Zhang <zhangchunyan@...as.ac.cn>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Andrew Morton <akpm@...ux-foundation.org>, 
	Alexandre Ghiti <alex@...ti.fr>, linux-riscv@...ts.infradead.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 0/3] riscv: mm: Add soft-dirty and uffd-wp support

On Thu, 15 Aug 2024 at 11:04, Chunyan Zhang <zhangchunyan@...as.ac.cn> wrote:
>
> This patchset adds soft dirty and userfaultfd write protect tracking support
> for RISC-V.
>
> As described in the patches, we are trying to utilize only one free PTE
> bit(9) to support three kernel features (devmap, soft-dirty, uffd-wp).
> Users cannot have them supported at the same time (have to select
> one when building the kernel).
>
> This patchset has been tested with:
> 1) The kselftest mm suite in which soft-dirty, madv_populate, test_unmerge_uffd_wp,
> and uffd-unit-tests run and pass, and no regressions are observed in any of the
> other tests.
>
> 2) CRIU:
> - 'criu check --feature mem_dirty_track' returns supported;
> - incremental_dumps[1] and simple_loop [2] dump and restores work fine;
> - zdtm test suite can run under host mode.
>
> V4:
> - Added bit(4) descriptions into "Format of swap PTE".
>
> V3:
> - Fixed the issue reported by kernel test irobot <lkp@...el.com>.
>
> V1 -> V2:
> - Add uffd-wp supported;
> - Make soft-dirty uffd-wp and devmap mutually exclusive which all use the same PTE bit;
> - Add test results of CRIU in the cover-letter.
>
> [1] https://www.criu.org/Incremental_dumps
> [2] https://asciinema.org/a/232445
>
> Chunyan Zhang (3):
>   riscv: mm: Prepare for reusing PTE RSW bit(9)
>   riscv: mm: Add soft-dirty page tracking support
>   riscv: mm: Add uffd write-protect support
>
>  arch/riscv/Kconfig                    |  34 ++++++-
>  arch/riscv/include/asm/pgtable-64.h   |   2 +-
>  arch/riscv/include/asm/pgtable-bits.h |  31 ++++++
>  arch/riscv/include/asm/pgtable.h      | 133 +++++++++++++++++++++++++-
>  4 files changed, 197 insertions(+), 3 deletions(-)
>

This patchset applies on top of v6.11-rc1.

> --
> 2.34.1
>