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Thu, 16 Jul 2026 05:42:41 -0700 (PDT) Received: from L6YN4KR4K9.bytedance.net ([2408:8606:1800:501::2:f]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cb258eeaba2sm1730793a12.12.2026.07.16.05.42.33 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Thu, 16 Jul 2026 05:42:41 -0700 (PDT) From: Yunhui Cui To: linux-riscv@lists.infradead.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: linux-arch@vger.kernel.org, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-efi@vger.kernel.org, linux-perf-users@vger.kernel.org, kasan-dev@googlegroups.com, Yunhui Cui Subject: [PATCH v2 00/15] riscv: add Svnapot PTE folding support Date: Thu, 16 Jul 2026 20:41:35 +0800 Message-Id: X-Mailer: git-send-email 2.39.2 (Apple Git-143) MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260716_054245_385999_61EA51A3 X-CRM114-Status: GOOD ( 11.26 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Svnapot can encode a naturally aligned 64KB range as a single folded PTE block. This series adds the RISC-V MM support needed to use that encoding for suitable user mappings while preserving the generic MM view of PAGE_SIZE PTEs. The series starts by adding raw PTE helpers and switching architecture page-table users that must see the encoded page-table entry to those raw helpers. It then introduces Svnapot read-side and update helpers for folded PTE ranges. Later patches make the generic PTE batch and leaf-size interfaces work with the raw encoded view where required, avoid redundant A/D aggregation and TLB flushes, optimize mprotect() for Svnapot ranges, and request 64KB executable folios when Svnapot is available so text mappings can benefit from lower iTLB pressure. Dependency: - This series depends on the prerequisite RISC-V patch posted at: https://lore.kernel.org/all/20260618064406.14508-1-cuiyunhui@bytedance.com/ Changes in v2: - Rework the v1 7-patch series into 15 smaller patches: split raw PTE helper introduction from the architecture-user conversion, and split Svnapot contpte handling into read-side and update-side pieces. - Add the generic MM helper changes needed by folded Svnapot mappings, including folio-batch comparison flags, raw-entry leaf-size queries and fast-GUP-specific lockless PTE helpers. - Make the RISC-V pte_batch_hint() implementation honor folio batch flags, and preserve Svnapot leaf-size semantics via __ptep_leaf_size(). - Add follow-up fixes and optimizations that were not in v1: avoid redundant A/D aggregation, avoid Svnapot consistency checks in ptep_get(), avoid A/D aggregation in fast-GUP, remove a redundant TLB flush, optimize mprotect() for Svnapot mappings, and request large executable folios when Svnapot is available. Yunhui Cui (15): riscv: introduce raw PTE helpers riscv: switch arch page-table users to raw PTE helpers riscv/mm: implement Svnapot contpte read-side helpers riscv/mm: implement Svnapot contpte update helpers mm: extend pte batch and leaf-size helpers riscv: make pte_batch_hint() honor folio batch flags riscv/mm: preserve Svnapot leaf-size semantics for page-table consumers riscv/mm: avoid redundant Svnapot A/D aggregation riscv/mm: avoid Svnapot consistency checks in ptep_get() mm/gup: add fast-GUP specific lockless PTE helpers riscv: mm: avoid Svnapot A/D aggregation in fast-GUP arm64: mm: avoid contpte A/D aggregation in fast-GUP riscv/mm: remove redundant TLB flush in napotpte_convert riscv/mm: optimize mprotect for Svnapot mappings riscv: mm: Request large exec folios for Svnapot arch/arm64/include/asm/pgtable.h | 25 +- arch/riscv/include/asm/kfence.h | 4 +- arch/riscv/include/asm/pgtable.h | 480 +++++++++++++++++- arch/riscv/kernel/efi.c | 4 +- arch/riscv/kernel/hibernate.c | 3 +- arch/riscv/kvm/gstage.c | 25 +- arch/riscv/kvm/mmu.c | 4 +- arch/riscv/mm/Makefile | 1 + arch/riscv/mm/contpte.c | 804 +++++++++++++++++++++++++++++++ arch/riscv/mm/fault.c | 4 +- arch/riscv/mm/hugetlbpage.c | 135 ++++-- arch/riscv/mm/init.c | 8 +- arch/riscv/mm/kasan_init.c | 16 +- arch/riscv/mm/pageattr.c | 12 +- arch/riscv/mm/pgtable.c | 52 +- include/linux/pgtable.h | 71 ++- kernel/events/core.c | 2 +- mm/gup.c | 6 +- mm/internal.h | 39 +- mm/mincore.c | 2 +- mm/mremap.c | 2 +- 21 files changed, 1542 insertions(+), 157 deletions(-) create mode 100644 arch/riscv/mm/contpte.c base-commit: b8809969e1d7a591e0f49dd464a5d04b3cf02ab1 -- 2.39.5