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* [PATCH v9 0/5] riscv: mm: Add soft-dirty and uffd-wp support
@ 2025-09-05 10:36 Chunyan Zhang
  2025-09-05 10:36 ` [PATCH v9 1/5] mm: softdirty: Add pte_soft_dirty_available() Chunyan Zhang
                   ` (4 more replies)
  0 siblings, 5 replies; 7+ messages in thread
From: Chunyan Zhang @ 2025-09-05 10:36 UTC (permalink / raw)
  To: linux-riscv, linux-mm, linux-fsdevel, linux-kernel
  Cc: Paul Walmsley, Palmer Dabbelt, Albert Ou, Alexandre Ghiti,
	Andrew Morton, Deepak Gupta, Ved Shanbhogue, Peter Xu,
	Alexander Viro, Christian Brauner, Arnd Bergmann, Jan Kara,
	Axel Rasmussen, Wei Xu, David Hildenbrand, Chunyan Zhang

This patchset adds support for Svrsw60t59b [1] extension which is ratified now,
also soft dirty and userfaultfd write protect tracking 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 v6.17-rc4.

V9:
- 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:
- Changes to use bits 59-60 which are supported by extension Svrsw60t59b
  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@intel.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-non-isa/riscv-iommu/pull/543

Chunyan Zhang (5):
  mm: softdirty: Add pte_soft_dirty_available()
  mm: uffd_wp: Add pte_uffd_wp_available()
  riscv: Add RISC-V Svrsw60t59b extension support
  riscv: mm: Add soft-dirty page tracking support
  riscv: mm: Add uffd 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      | 140 +++++++++++++++++++++++++-
 arch/riscv/kernel/cpufeature.c        |   1 +
 fs/proc/task_mmu.c                    |  12 ++-
 fs/userfaultfd.c                      |  25 +++--
 include/asm-generic/pgtable_uffd.h    |  12 +++
 include/linux/mm_inline.h             |   6 +-
 include/linux/pgtable.h               |  10 ++
 include/linux/userfaultfd_k.h         |  44 +++++---
 mm/debug_vm_pgtable.c                 |   9 +-
 mm/huge_memory.c                      |  13 +--
 mm/internal.h                         |   2 +-
 mm/memory.c                           |   6 +-
 mm/mremap.c                           |  13 +--
 mm/userfaultfd.c                      |  12 +--
 17 files changed, 302 insertions(+), 57 deletions(-)

-- 
2.34.1



^ permalink raw reply	[flat|nested] 7+ messages in thread
end of thread, other threads:[~2025-09-06 13:31 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
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2025-09-05 10:36 [PATCH v9 0/5] riscv: mm: Add soft-dirty and uffd-wp support Chunyan Zhang
2025-09-05 10:36 ` [PATCH v9 1/5] mm: softdirty: Add pte_soft_dirty_available() Chunyan Zhang
2025-09-05 10:36 ` [PATCH v9 2/5] mm: uffd_wp: Add pte_uffd_wp_available() Chunyan Zhang
2025-09-06 13:31   ` kernel test robot
2025-09-05 10:36 ` [PATCH v9 3/5] riscv: Add RISC-V Svrsw60t59b extension support Chunyan Zhang
2025-09-05 10:36 ` [PATCH v9 4/5] riscv: mm: Add soft-dirty page tracking support Chunyan Zhang
2025-09-05 10:36 ` [PATCH v9 5/5] riscv: mm: Add uffd write-protect support Chunyan Zhang

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