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(unknown [210.73.43.101]) by APP-01 (Coremail) with SMTP id qwCowADHHqHO+b9oWh7qAQ--.61766S2; Tue, 09 Sep 2025 17:56:32 +0800 (CST) From: Chunyan Zhang To: linux-riscv@lists.infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org 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 Subject: [PATCH V10 0/5] riscv: mm: Add soft-dirty and uffd-wp support Date: Tue, 9 Sep 2025 17:56:06 +0800 Message-Id: <20250909095611.803898-1-zhangchunyan@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:qwCowADHHqHO+b9oWh7qAQ--.61766S2 X-Coremail-Antispam: 1UD129KBjvJXoWxWw4xJr1ruF1fZFW7ury8Xwb_yoW5Kw1UpF s8K343tr45tryIgws3Ww1j9a1jqan5Gw1rC345J34rA3ya9F1jvrnY9w48GF1DJF4UWryS qrWakryq934qyaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9vb7Iv0xC_KF4lb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Gr0_Cr1l84ACjcxK6I8E87Iv67AKxVWxJr0_GcWl84ACjcxK6I 8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI 64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVW8JVWxJw Am72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkI wI1lc7CjxVAaw2AFwI0_GFv_Wrylc2xSY4AK67AK6r4fMxAIw28IcxkI7VAKI48JMxC20s 026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_ JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14 v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xva j40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JV W8JrUvcSsGvfC2KfnxnUUI43ZEXa7IUngzVUUUUUU== X-CM-SenderInfo: x2kd0wxfkx051dq6x2xfdvhtffof0/1tbiCQ8AB2i-pw8OnwABsu This patchset adds support for Svrsw60t59b [1] extension which is ratified now, also soft dirty and userfaultfd write protect tracking for RISC-V. The patches 1 and 2 add macros to detect if the soft-dirty / uffd_wp PTE bits are available, in other words, the Svrsw60t59b extension is supported for the RISC-V device on which 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-rc4. V10: - Fixed the issue reported by kernel test irobot . 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 . 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. [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 | 17 +++- fs/userfaultfd.c | 25 +++-- include/asm-generic/pgtable_uffd.h | 12 +++ include/linux/mm_inline.h | 7 ++ include/linux/pgtable.h | 10 ++ include/linux/userfaultfd_k.h | 44 +++++--- mm/debug_vm_pgtable.c | 9 +- mm/huge_memory.c | 10 +- mm/internal.h | 2 +- mm/memory.c | 6 +- mm/mremap.c | 10 +- mm/userfaultfd.c | 6 +- 17 files changed, 306 insertions(+), 47 deletions(-) -- 2.34.1