linux-kernel - [PATCH V2 0/3] riscv: mm: Add soft-dirty and uffd-wp support

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Message-Id: <20240731040444.3384790-1-zhangchunyan@iscas.ac.cn>
Date: Wed, 31 Jul 2024 12:04:41 +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: linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Chunyan Zhang <zhang.lyra@...il.com>
Subject: [PATCH V2 0/3] riscv: mm: Add soft-dirty and uffd-wp support

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 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 works fine
- zdtm test suite can run under host mode

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.

Chunyan Zhang (3):
  riscv: mm: Prepare for reuse 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      | 132 +++++++++++++++++++++++++-
 4 files changed, 196 insertions(+), 3 deletions(-)

-- 
2.34.1