linux-kernel - Re: [PATCH V6 0/2] riscv: mm: Add soft-dirty and uffd-wp support

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Message-ID: <CAAfSe-vx-fvqk1pxp0rCU70Wq6HHH52k9OZaCO8O+-Sw7-yGCg@mail.gmail.com>
Date: Tue, 8 Apr 2025 17:21:08 +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>, Deepak Gupta <debug@...osinc.com>, Ved Shanbhogue <ved@...osinc.com>, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V6 0/2] riscv: mm: Add soft-dirty and uffd-wp support

On Tue, 8 Apr 2025 at 16:43, Chunyan Zhang <zhangchunyan@...as.ac.cn> wrote:
>
> This patchset adds soft dirty and userfaultfd write protect tracking
> support for RISC-V.
>
> This patchset has been tested with 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.
>
> This patchset applies on top of v6.15-rc1.
>
> V6:
> - Changes to use bits 59-60 which are supported by extension Svrsw60t59b [1]
>   for soft dirty and userfaultfd write protect tracking.

This should be an RFC patchset, we should be able to enable these two
features only when the extension Svrsw60t59b is valid, I will add that
check in the next version of patchset.

Thanks,
Chunyan

>
> V5:
> - Fixed typos and corrected some words in Kconfig and commit message;
> - Removed pte_wrprotect() from pte_swp_mkuffd_wp(), this is a copy-paste error;
> - Added Alex's Reviewed-by tag in patch 2.
>
> 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://github.com/riscv/Svrsw60t59b.git
>
> Chunyan Zhang (2):
>   riscv: mm: Add soft-dirty page tracking support
>   riscv: mm: Add uffd write-protect support
>
>  arch/riscv/Kconfig                    |   2 +
>  arch/riscv/include/asm/pgtable-bits.h |  29 ++++++
>  arch/riscv/include/asm/pgtable.h      | 136 +++++++++++++++++++++++++-
>  3 files changed, 165 insertions(+), 2 deletions(-)
>
> --
> 2.34.1
>