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* [PATCH V12 0/5] riscv: mm: Add soft-dirty and uffd-wp support
@ 2025-09-15 10:13 Chunyan Zhang
  2025-09-15 10:13 ` [PATCH V12 1/5] mm: softdirty: Add pgtable_supports_soft_dirty() Chunyan Zhang
                   ` (5 more replies)
  0 siblings, 6 replies; 14+ messages in thread
From: Chunyan Zhang @ 2025-09-15 10:13 UTC (permalink / raw)
  To: linux-riscv, linux-fsdevel, linux-mm, linux-kernel
  Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
	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.

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 v6.17-rc6.

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

V12:
- 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 (5):
  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

 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             |  10 +-
 include/linux/pgtable.h               |  12 +++
 include/linux/userfaultfd_k.h         |  27 +++--
 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 +-
 21 files changed, 306 insertions(+), 69 deletions(-)

-- 
2.34.1


^ permalink raw reply	[flat|nested] 14+ messages in thread
end of thread, other threads:[~2025-09-16 21:57 UTC | newest]

Thread overview: 14+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2025-09-15 10:13 [PATCH V12 0/5] riscv: mm: Add soft-dirty and uffd-wp support Chunyan Zhang
2025-09-15 10:13 ` [PATCH V12 1/5] mm: softdirty: Add pgtable_supports_soft_dirty() Chunyan Zhang
2025-09-15 13:52   ` David Hildenbrand
2025-09-15 10:13 ` [PATCH V12 2/5] mm: userfaultfd: Add pgtable_supports_uffd_wp() Chunyan Zhang
2025-09-15 13:56   ` David Hildenbrand
2025-09-15 17:05   ` Conor Dooley
2025-09-16  5:55   ` kernel test robot
2025-09-15 10:13 ` [PATCH V12 3/5] riscv: Add RISC-V Svrsw60t59b extension support Chunyan Zhang
2025-09-15 17:03   ` Conor Dooley
2025-09-16 21:57   ` Deepak Gupta
2025-09-15 10:13 ` [PATCH V12 4/5] riscv: mm: Add soft-dirty page tracking support Chunyan Zhang
2025-09-16 21:45   ` Deepak Gupta
2025-09-15 10:13 ` [PATCH V12 5/5] riscv: mm: Add userfaultfd write-protect support Chunyan Zhang
2025-09-15 13:45 ` [PATCH V12 0/5] riscv: mm: Add soft-dirty and uffd-wp support David Hildenbrand

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