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

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Message-Id: <20250408084301.68186-1-zhangchunyan@iscas.ac.cn>
Date: Tue,  8 Apr 2025 16:42:59 +0800
From: Chunyan Zhang <zhangchunyan@...as.ac.cn>
To: 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>
Cc: Deepak Gupta <debug@...osinc.com>,
	Ved Shanbhogue <ved@...osinc.com>,
	linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Chunyan Zhang <zhang.lyra@...il.com>
Subject: [PATCH V6 0/2] riscv: mm: Add soft-dirty and uffd-wp support

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.

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