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(unknown [210.73.43.101]) by APP-03 (Coremail) with SMTP id rQCowACH2IK5nMJoo6pCAg--.44660S2; Thu, 11 Sep 2025 17:56:09 +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 v11 0/5] riscv: mm: Add soft-dirty and uffd-wp support Date: Thu, 11 Sep 2025 17:55:57 +0800 Message-Id: <20250911095602.1130290-1-zhangchunyan@iscas.ac.cn> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CM-TRANSID:rQCowACH2IK5nMJoo6pCAg--.44660S2 X-Coremail-Antispam: 1UD129KBjvJXoWxWw4xGry5XF47Xry3Gw4kJFb_yoWrWFWkpF 45G343tr4rtr1Igws3Jw1j9a1Fqan5tw1rCw15X34rA3y2gF1jyrnaka1rGF1DJF48WryS qrWakryq93yqyaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9vb7Iv0xC_Kw4lb4IE77IF4wAFF20E14v26ryj6rWUM7CY07I2 0VC2zVCF04k26cxKx2IYs7xG6rWj6s0DM7CIcVAFz4kK6r1j6r18M28lY4IEw2IIxxk0rw A2F7IY1VAKz4vEj48ve4kI8wA2z4x0Y4vE2Ix0cI8IcVAFwI0_Gr0_Xr1l84ACjcxK6xII jxv20xvEc7CjxVAFwI0_Cr0_Gr1UM28EF7xvwVC2z280aVAFwI0_GcCE3s1l84ACjcxK6I 8E87Iv6xkF7I0E14v26rxl6s0DM2AIxVAIcxkEcVAq07x20xvEncxIr21l5I8CrVACY4xI 64kE6c02F40Ex7xfMcIj6xIIjxv20xvE14v26r106r15McIj6I8E87Iv67AKxVW8JVWxJw Am72CE4IkC6x0Yz7v_Jr0_Gr1lF7xvr2IYc2Ij64vIr41lFIxGxcIEc7CjxVA2Y2ka0xkI wI1lc7CjxVAaw2AFwI0_GFv_Wrylc2xSY4AK67AK6r4fMxAIw28IcxkI7VAKI48JMxC20s 026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_ JrI_JrWlx4CE17CEb7AF67AKxVW8ZVWrXwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14 v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVW8JVWxJwCI42IY6xAIw20EY4v20xva j40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVW8JV W8JrUvcSsGvfC2KfnxnUUI43ZEXa7IUYvXd7UUUUU== X-Originating-IP: [210.73.43.101] X-CM-SenderInfo: x2kd0wxfkx051dq6x2xfdvhtffof0/1tbiDAYCB2jCjVc9NAAAs2 X-Rspamd-Queue-Id: F32A220010 X-Stat-Signature: 81rya3mws3pq71oghkmiydr1dq877cw6 X-Rspam-User: X-Rspamd-Server: rspam01 X-HE-Tag: 1757584606-415052 X-HE-Meta: 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 Alj+rGAl 2XzqjLvYhxq+POIxVWaB7Q42FA+YmPjClS3FGaypTywcusTETlgdmzC6qo7wN9HznM6HHZTD+g/ZAgheuC8baIq7dG1sFL/rZpSus4jPZ+fWafDdaCi+3li1bue81vds9wH+iA3DOsmuKKeWiNqDDmOEl0JacH31l7amy5zzgrp90qMhxsdLTz+/C0EHzlKSrH8kv0GdzMTkf3YMjWQwWXP7EhTDa/FHo8gaRm/CbrsTeISduM2ca4r/VfsepHhLopf648WyANX8a+itfPyG7E1//jvmEOKnUrf3m6Fh3vbgVs8o= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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-rc4. [1] https://github.com/riscv-non-isa/riscv-iommu/pull/543 V11: - 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 . 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. Chunyan Zhang (5): mm: softdirty: Add pgtable_soft_dirty_supported() mm: userfaultfd: Add pgtable_uffd_wp_supported() 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 | 17 ++- fs/userfaultfd.c | 23 +++-- include/asm-generic/pgtable_uffd.h | 11 ++ include/linux/mm_inline.h | 7 ++ include/linux/pgtable.h | 12 +++ include/linux/userfaultfd_k.h | 44 +++++--- mm/debug_vm_pgtable.c | 10 +- mm/huge_memory.c | 13 +-- mm/internal.h | 2 +- mm/memory.c | 6 +- mm/mremap.c | 13 +-- mm/userfaultfd.c | 10 +- 17 files changed, 310 insertions(+), 56 deletions(-) -- 2.34.1