From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D32F8C44514 for ; Thu, 16 Jul 2026 12:42:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-Id:Date:Subject:Cc :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=lVk5hsuk+XVup2H3xJy3cW/owjrDgK6q8MpaJ9lYYAo=; b=mZMfBlw0aAQYol TMVWbBhwUwB1bqx11AT3nS9F965wft1+MmbTzouGQ+PUjArHx1+uI5zg1ETgZyP8jb3rEItwF9XOq VGPOAFlmQWW/pKiGPtozw1Xb/Jk9/PGariQqn7zUz8MomNlJxOs/EDFOu5ukCvN3b1RpNHpObZ3wD /Lk8zmBaIKc3EA8xo1gi1bXV99wNF/tQbcgNPvqyOzertTbirj3l6gGozJtV6JIqZHpnmIWx5Zuls 3Ra80Of+z9iYo4KmzeijjQ7qJ0xFe2eEnz7iDQOy3SPvfVLiyJSTlb9Zmsbs3d3G+atEYWEQyvEGF GOd9b7KaCf4sscWBBCfA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.99.1 #2 (Red Hat Linux)) id 1wkLQN-0000000HHnR-0QOu; Thu, 16 Jul 2026 12:42:47 +0000 Received: from mail-pf1-x433.google.com ([2607:f8b0:4864:20::433]) by bombadil.infradead.org with esmtps (Exim 4.99.1 #2 (Red Hat Linux)) id 1wkLQL-0000000HHm4-1PbU for linux-riscv@lists.infradead.org; Thu, 16 Jul 2026 12:42:46 +0000 Received: by mail-pf1-x433.google.com with SMTP id d2e1a72fcca58-8487b7b4066so6756930b3a.1 for ; Thu, 16 Jul 2026 05:42:42 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance.com; s=google; t=1784205762; x=1784810562; darn=lists.infradead.org; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to:content-type; bh=SXHE9RUaBpTIzBZsLxmZxoZ7/zzqOF995lpxXageMRM=; b=ZSlz/rydIG3nxH2Ac0zHhjeSzaBJ3ccyhBe/EcBXUhFiHfsqpo/MX//1z++V47vN0Q jAJmy2cSQPYetzd9ATulIUkc8lxqfO11FOEkwhZq/dZVjKKu6c2C1sef0TauXleXmzxG SFcH9ubNULyVgY+E8Jz3Tz5eN5+t8BHPiYbKpitvFjp6p69FiljOXmhcrB/hUAqGA1Ib nlTcS27JBqXoH2/yCd40F3Ygga5O+NudB0o1qDHEApaCp98dGnOIaBCBBBjDFy/dXkMG 203qDQx+PolmlhakE6fKZ+oVHmuCbSNUux0SmWNmUHmMBn+utMsneB/tKXn7K1rBz6N/ c1oQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1784205762; x=1784810562; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-gg:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to:content-type; bh=SXHE9RUaBpTIzBZsLxmZxoZ7/zzqOF995lpxXageMRM=; b=QOI1j9eqO74D9HE2MxwCshq9gpSjiUGMYUGrBGM2fP9MOFQLdq0pvc2J6+URq1Jr0B Hih2R/UaSn977JABHT/ev85emhveFFCnRr+ArJ+MSBTmjbaVAbuRAqiBGX+FFZTqtfUR d7KI0Q3XJV2hfzljSJU/4EZNp1ZOXZioq0fvaV8Xr4qW9wWW1yfDKNqYcp+YTsK1aSWV zyCZy2cqW6IlRl0PcvkBo/mwJd6/LTrXMa/JYtN0gVGedTyskygFqKwoHJDJe+AlfBGJ ZzHtGQIIaKtrJZIUtEssp+d5CeQL6y8FYezCTNqNFVB4EZ7iZqQEhM3lm4EHBY4UEk0E jg/g== X-Gm-Message-State: AOJu0YzDReMIwAGZBVRpTVMngv4R62nIJYc0Im+wudLGB0p7aati6DWY PG3nAxEr53V+vrbBomJYQhfUYKPkoTH/9w5LJKKiej1cKk3iOJm8irO7w+YW6EQ4u4SNpb2drXt bygepRf4= X-Gm-Gg: AfdE7clOkzZw9Ea7q/c9bkh51sHXuOiLN0ou+z/tX9N/O4DG0ncZe5vl9EJzw9Ff5pl ysYNQ3gvhZ4CelTv3Jf3I5AoENfL3SfRuttr8s8tSJqmYiexO9gaXQqT72Up6d47tHSZq4oeI5x IXvAxLVvK/0qssiemFuieqlnbYnta/Sh8QpDILCTAhw10MLPh1sCRY+yFP8+UIpR8uN3szYMeFO hDkEMqXEAUI9WmJKm2t4DWAtHzNInQsKT/oVNIlolJrqHmWtmK1RuVkPiwc6ugtpLbEkNEaOV0z xk8VTidORHfR2TX25Bgbs/kq1LhUblBKUd2wVZTjDMGPZQRDP9FjWyJzg45wX6BTD3v5WbauCoN +EI/xB74eDxo99kaSB4etcATOUgY2HbUrGRnBPq3Z1WiawpAyd3x3AUfeREaR7CWIOpXTU++u6E gS//mBBKLWa517f2tHUwXTGGA= X-Received: by 2002:a05:6a00:815:b0:847:7f38:27c6 with SMTP id d2e1a72fcca58-84a672b4789mr6422956b3a.50.1784205761835; 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260716_054245_385837_0BBEAF01 X-CRM114-Status: GOOD ( 10.09 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=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 _______________________________________________ linux-riscv mailing list linux-riscv@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-riscv