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Message-ID: <CAAfSe-v6+Gc8ujv3m3LdBPk+rGSqmz44RheoNqGJcXjOq3vU9A@mail.gmail.com>
Date: Tue, 18 Nov 2025 16:16:30 +0800
From: Chunyan Zhang <zhang.lyra@...il.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>,
Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
Alexander Viro <viro@...iv.linux.org.uk>, linux-mm@...ck.org, Peter Xu <peterx@...hat.com>,
Arnd Bergmann <arnd@...db.de>, David Hildenbrand <david@...hat.com>,
Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, "Liam R . Howlett" <Liam.Howlett@...cle.com>,
Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>, Suren Baghdasaryan <surenb@...gle.com>,
Michal Hocko <mhocko@...e.com>, Axel Rasmussen <axelrasmussen@...gle.com>,
Yuanchu Xie <yuanchu@...gle.com>, linux-riscv@...ts.infradead.org,
Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, devicetree@...r.kernel.org,
Conor Dooley <conor@...nel.org>, Deepak Gupta <debug@...osinc.com>, Ved Shanbhogue <ved@...osinc.com>,
linux-fsdevel@...r.kernel.org, Christian Brauner <brauner@...nel.org>, Jan Kara <jack@...e.cz>,
linux-kernel@...r.kernel.org, Chunyan Zhang <zhangchunyan@...as.ac.cn>
Subject: Re: [PATCH V15 0/6] mm: Add soft-dirty and uffd-wp support for RISC-V
Hi Andrew,
On Thu, 13 Nov 2025 at 15:28, Chunyan Zhang <zhangchunyan@...as.ac.cn> wrote:
>
> 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 the mm/mm-new branch commit ea53cb52f919
> ("mm/vmalloc: cleanup gfp flag use in new_vmap_block()")
>
> [1] https://github.com/riscv-non-isa/riscv-iommu/pull/543
>
Can this patchset go through the mm tree if there's no more comments?
Thanks,
Chunyan
> V15:
> - Rebased on to the latest mm-new branch;
> - Removed a redundant space;
> - Added Conor's Acked-by.
>
> V14: https://lore.kernel.org/all/20250918083731.1820327-1-zhangchunyan@iscas.ac.cn/
> - Fix indent inssues in userfaultfd_k.h;
> - Some descriptions and comments minor changes.
>
> V13: https://lore.kernel.org/all/20250917033703.1695933-1-zhangchunyan@iscas.ac.cn/
> - 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_marker();
> - Add Svrsw60t59b 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@...el.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@...el.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 | 8 +-
> include/linux/pgtable.h | 12 ++
> include/linux/userfaultfd_k.h | 69 +++++----
> 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, 337 insertions(+), 84 deletions(-)
>
> --
> 2.34.1
>
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