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* [PATCH V13 0/6] riscv: mm: Add soft-dirty and uffd-wp support
@ 2025-09-17  3:36 Chunyan Zhang
  2025-09-17  3:36 ` [PATCH V13 1/6] mm: softdirty: Add pgtable_supports_soft_dirty() Chunyan Zhang
                   ` (5 more replies)
  0 siblings, 6 replies; 10+ messages in thread
From: Chunyan Zhang @ 2025-09-17  3:36 UTC (permalink / raw)
  To: linux-riscv, linux-fsdevel, linux-mm, linux-kernel
  Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
	Conor Dooley, Deepak Gupta, Ved Shanbhogue, Alexander Viro,
	Christian Brauner, Jan Kara, Andrew Morton, Peter Xu,
	Arnd Bergmann, David Hildenbrand, Lorenzo Stoakes,
	Liam R . Howlett, Vlastimil Babka, Mike Rapoport,
	Suren Baghdasaryan, Michal Hocko, Axel Rasmussen, Yuanchu Xie,
	Chunyan Zhang

This patchset adds support for Svrsw60t59b [1] extension which is ratified now,
also add soft dirty and userfaultfd write protect tracking for RISC-V.

The patches 1 and 2 add macros to allow architectures to define their own checks
if the soft-dirty / uffd_wp PTE bits are available, in other words for RISC-V,
the Svrsw60t59b extension is supported on which device the kernel is running.
Also patch1-2 are removing "ifdef CONFIG_MEM_SOFT_DIRTY"
"ifdef CONFIG_HAVE_ARCH_USERFAULTFD_WP" and
"ifdef CONFIG_PTE_MARKER_UFFD_WP" in favor of checks which if not overridden by
the architecture, no change in behavior is expected.

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 the lastest mm-new branch.

[1] https://github.com/riscv-non-isa/riscv-iommu/pull/543

V13:
- Rebase on mm-new branch;
- Fixed build errors;
- Add more exactly descriptions in commit message in patch 1-2;
- Replace '__always_inline' with 'inline' for uffd_supports_wp_markeruffd_supports_wp_marker();
- Add description to the extensions dt-binding in patch 6.

V12: https://lore.kernel.org/all/20250915101343.1449546-1-zhangchunyan@iscas.ac.cn/
- Rename the macro API to pgtable_supports_soft_dirty/uffd_wp();
- Add changes for setting VM_SOFTDIRTY flags conditionally;
- Drop changes to show_smap_vma_flags();
- Drop CONFIG_MEM_SOFT_DIRTY compile condition of clear_soft_dirty() and clear_soft_dirty_pmd();
- Fix typos;
- Add uffd_supports_wp_marker() and drop some ifdef CONFIG_PTE_MARKER_UFFD_WP.

V11: https://lore.kernel.org/all/20250911095602.1130290-1-zhangchunyan@iscas.ac.cn/
- Rename the macro API to pgtable_*_supported() since we also have PMD support;
- Change the default implementations of two macros, make CONFIG_MEM_SOFT_DIRTY or
  CONFIG_HAVE_ARCH_USERFAULTFD_WP part of the macros;
- Correct the order of insertion of RISCV_ISA_EXT_SVRSW60T59B;
- Rephrase some comments.

V10: https://lore.kernel.org/all/20250909095611.803898-1-zhangchunyan@iscas.ac.cn/
- Fixed the issue reported by kernel test irobot <lkp@intel.com>.

V9: https://lore.kernel.org/all/20250905103651.489197-1-zhangchunyan@iscas.ac.cn/
- Add pte_soft_dirty/uffd_wp_available() API to allow dynamically checking
  if the PTE bit is available for the platform on which the kernel is running.

V8: https://lore.kernel.org/all/20250619065232.1786470-1-zhangchunyan@iscas.ac.cn/)
- Rebase on v6.16-rc1;
- Add dependencies to MMU && 64BIT for RISCV_ISA_SVRSW60T59B;
- Use 'Svrsw60t59b' instead of 'SVRSW60T59B' in Kconfig help paragraph;
- Add Alex's Reviewed-by tag in patch 1.

V7: https://lore.kernel.org/all/20250409095320.224100-1-zhangchunyan@iscas.ac.cn/
- Add Svrsw60t59b [1] extension support;
- Have soft-dirty and uffd-wp depending on the Svrsw60t59b extension to
  avoid crashes for the hardware which don't have this extension.

V6: https://lore.kernel.org/all/20250408084301.68186-1-zhangchunyan@iscas.ac.cn/
- Changes to use bits 59-60 which are supported by extension Svrsw60t59b
  for soft dirty and userfaultfd write protect tracking.

V5: https://lore.kernel.org/all/20241113095833.1805746-1-zhangchunyan@iscas.ac.cn/
- 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: https://lore.kernel.org/all/20240830011101.3189522-1-zhangchunyan@iscas.ac.cn/
- Added bit(4) descriptions into "Format of swap PTE".

V3: https://lore.kernel.org/all/20240805095243.44809-1-zhangchunyan@iscas.ac.cn/
- Fixed the issue reported by kernel test irobot <lkp@intel.com>.

V2: https://lore.kernel.org/all/20240731040444.3384790-1-zhangchunyan@iscas.ac.cn/
- 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 (6):
  mm: softdirty: Add pgtable_supports_soft_dirty()
  mm: userfaultfd: Add pgtable_supports_uffd_wp()
  riscv: Add RISC-V Svrsw60t59b extension support
  riscv: mm: Add soft-dirty page tracking support
  riscv: mm: Add userfaultfd write-protect support
  dt-bindings: riscv: Add Svrsw60t59b extension description

 .../devicetree/bindings/riscv/extensions.yaml |   6 +
 arch/riscv/Kconfig                            |  16 ++
 arch/riscv/include/asm/hwcap.h                |   1 +
 arch/riscv/include/asm/pgtable-bits.h         |  37 +++++
 arch/riscv/include/asm/pgtable.h              | 143 +++++++++++++++++-
 arch/riscv/kernel/cpufeature.c                |   1 +
 fs/proc/task_mmu.c                            |  15 +-
 fs/userfaultfd.c                              |  22 +--
 include/asm-generic/pgtable_uffd.h            |  17 +++
 include/linux/mm.h                            |   3 +
 include/linux/mm_inline.h                     |  12 +-
 include/linux/pgtable.h                       |  12 ++
 include/linux/userfaultfd_k.h                 | 114 ++++++++------
 mm/debug_vm_pgtable.c                         |  10 +-
 mm/huge_memory.c                              |  13 +-
 mm/internal.h                                 |   2 +-
 mm/memory.c                                   |   6 +-
 mm/mmap.c                                     |   6 +-
 mm/mremap.c                                   |  13 +-
 mm/userfaultfd.c                              |  10 +-
 mm/vma.c                                      |   6 +-
 mm/vma_exec.c                                 |   5 +-
 22 files changed, 365 insertions(+), 105 deletions(-)

-- 
2.34.1


^ permalink raw reply	[flat|nested] 10+ messages in thread
end of thread, other threads:[~2025-09-18  0:10 UTC | newest]

Thread overview: 10+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-09-17  3:36 [PATCH V13 0/6] riscv: mm: Add soft-dirty and uffd-wp support Chunyan Zhang
2025-09-17  3:36 ` [PATCH V13 1/6] mm: softdirty: Add pgtable_supports_soft_dirty() Chunyan Zhang
2025-09-17  3:36 ` [PATCH V13 2/6] mm: userfaultfd: Add pgtable_supports_uffd_wp() Chunyan Zhang
2025-09-17  7:25   ` David Hildenbrand
2025-09-17  9:20     ` Chunyan Zhang
2025-09-17  3:37 ` [PATCH V13 3/6] riscv: Add RISC-V Svrsw60t59b extension support Chunyan Zhang
2025-09-17  3:37 ` [PATCH V13 4/6] riscv: mm: Add soft-dirty page tracking support Chunyan Zhang
2025-09-17  3:37 ` [PATCH V13 5/6] riscv: mm: Add userfaultfd write-protect support Chunyan Zhang
2025-09-17  3:37 ` [PATCH V13 6/6] dt-bindings: riscv: Add Svrsw60t59b extension description Chunyan Zhang
2025-09-18  0:10   ` Krzysztof Kozlowski

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