[{"id":3679825,"web_url":"http://patchwork.ozlabs.org/comment/3679825/","msgid":"<62c418bc-082b-4ae2-a889-f63dd2b7f503@kernel.org>","list_archive_url":null,"date":"2026-04-21T11:28:03","subject":"Re: [PATCH v1 0/7] riscv: add Svnapot-based contiguous PTE support","submitter":{"id":92023,"url":"http://patchwork.ozlabs.org/api/people/92023/","name":"David Hildenbrand (Arm)","email":"david@kernel.org"},"content":"On 4/21/26 11:24, Yunhui Cui wrote:\n> Hi,\n> \n> First of all, thanks to Ryan Roberts for the work on mTHP and\n> Contiguous PTE support on arm64. That work provides a very useful\n> reference for reducing page fault overhead and TLB pressure for\n> large but still PTE-mapped memory ranges.\n> \n> This series adds Svnapot-based contiguous PTE support for RISC-V.\n> \n> To achieve similar benefits on RISC-V, this series introduces a\n> Contiguous-PTE-like mechanism built on top of the Svnapot extension.\n> The intent is to preserve the core-MM PTE semantics while allowing\n> RISC-V to transparently fold eligible base-page mappings into\n> Svnapot-encoded contiguous mappings when possible.\n> \n> The series splits the low-level raw PTE helpers from the public\n> core-MM-facing PTE helpers, so that:\n> \n> -the __xxx helpers expose the raw hardware PTE encoding,\n> -the xxx helpers provide the semantic view expected by core MM,\n> -and Svnapot-aware handling is centralized in the public wrapper layer.\n\n\nJust curious, is there opportunity to share some of the code with arm64,\nfactoring out helpers that handle something like\nCONFIG_ARCH_HAS_CONTIG_PTES ?","headers":{"Return-Path":"\n ","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n secure) header.d=lists.infradead.org header.i=@lists.infradead.org\n header.a=rsa-sha256 header.s=bombadil.20210309 header.b=0zWG6N2Z;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256\n header.s=k20201202 header.b=MkHF6pjJ;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=none (no SPF record) smtp.mailfrom=lists.infradead.org\n (client-ip=2607:7c80:54:3::133; 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a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;\n\td=lists.infradead.org; s=bombadil.20210309; h=Sender:\n\tContent-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post:\n\tList-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:To:Subject:\n\tMIME-Version:Date:Message-ID:Reply-To:Cc:Content-ID:Content-Description:\n\tResent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=UUNI+nH++lI1atI+TtTbbVW+4ddiFUH1y95lR+po5jY=; b=0zWG6N2Zs6Cm2r\n\tChkSatrgb5j8pBVx6aHhdvyD7cKMPtUeS34wr6KhhpMVIiNGlfjt5/8FjV7HmRPT4NMSQ2loXen3X\n\tPPllmF2QwTZj2j3iQl69WmFD+W6ybry1wqNNNubfloJDJPh+qI4eem187GjePBZGyc0966+NsAUVw\n\tRKwZtQS3X9kDmE+jgqAICcTIAS4lJjuei4lDwP1hNlo01FBTlXmaVmCnpiR1wCVa6f3yhxlnTYTtP\n\t8tdvyC1CVQxOIRynO/qmjDklCgl8cJ8S48VNU20+0/66CB5jz65P2uZUcu3w9iZ7RJdi8ISU76g5u\n\tsYnkO3RN/EstncVZSilA==;","v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org;\n\ts=k20201202; t=1776770897;\n\tbh=P++Yyn1JP/4b/huOi9i6Zb2cbr0smKxdMdTr8Xy6wss=;\n\th=Date:Subject:To:References:From:In-Reply-To:From;\n\tb=MkHF6pjJ3Z2MOSn6pQjQ8C0UJL1o3JdWCUsMuV4cwVyYgySCuMyRw+WsS50l9zXge\n\t WHWWh6KcnSUcpjubpmDzfM/CVreYdbRm/BF1uM01NQc7QJCpMRBJSYR9pS3Tyyg1Br\n\t S9YeZOZXRhPHP0UnJZMNJ6fv+em6MqeTyx3oYCqUIkBcLeR+osJG2jhkdNwgWr4kJL\n\t R1uI0tS82llARgyNsrpVtFHDhJKTK6IfrKm4M0zBDAUqX/QsYjdnPOaBcLAiRtCekS\n\t gBNKjr3toK6mms4Xbm3lGfhD0MN3PYVe8mWKbeGDElZ2yu+UzPhw+rICgghvHFUvfx\n\t OiTSUr893AfdQ=="],"Message-ID":"<62c418bc-082b-4ae2-a889-f63dd2b7f503@kernel.org>","Date":"Tue, 21 Apr 2026 13:28:03 +0200","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH v1 0/7] riscv: add Svnapot-based contiguous PTE support","To":"Yunhui Cui , akpm@linux-foundation.org,\n alex@ghiti.fr, andrew+kernel@donnellan.id.au, andreyknvl@gmail.com,\n anup@brainfault.org, aou@eecs.berkeley.edu, apopple@nvidia.com,\n ardb@kernel.org, atish.patra@linux.dev, baolin.wang@linux.alibaba.com,\n debug@rivosinc.com, djordje.todorovic@htecgroup.com, dvyukov@google.com,\n elver@google.com, glider@google.com, ilias.apalodimas@linaro.org,\n junhui.liu@pigmoral.tech, kasan-dev@googlegroups.com, kees@kernel.org,\n kevin.brodsky@arm.com, kvm-riscv@lists.infradead.org, kvm@vger.kernel.org,\n linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org,\n linux-riscv@lists.infradead.org, liu.xuemei1@zte.com.cn, ljs@kernel.org,\n namcao@linutronix.de, osalvador@suse.de, palmer@dabbelt.com, pjw@kernel.org,\n rmclure@linux.ibm.com, rostedt@goodmis.org, rppt@kernel.org,\n ryabinin.a.a@gmail.com, surenb@google.com, vincenzo.frascino@arm.com,\n vishal.moola@gmail.com, wangruikang@iscas.ac.cn, zhangchunyan@iscas.ac.cn","References":"<20260421092457.37649-1-cuiyunhui@bytedance.com>","From":"\"David Hildenbrand (Arm)\" ","Content-Language":"en-US","Autocrypt":"addr=david@kernel.org; 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The original\n message has been attached to this so you can view it or label\n similar future email. If you have any questions, see\n the administrator of that system for details.\n Content preview: On 4/21/26 11:24, Yunhui Cui wrote: > Hi, > > First of all,\n thanks to Ryan Roberts for the work on mTHP and > Contiguous PTE support\n on arm64. That work provides a very useful > reference for reducing [...]\n Content analysis details: (-2.1 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 SPF_PASS SPF: sender matches SPF record\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from\n author's\n domain\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\n -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\n -0.0 DKIMWL_WL_HIGH DKIMwl.org - High trust sender","X-BeenThere":"kvm-riscv@lists.infradead.org","X-Mailman-Version":"2.1.34","Precedence":"list","List-Id":"","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Content-Type":"text/plain; charset=\"us-ascii\"","Content-Transfer-Encoding":"7bit","Sender":"\"kvm-riscv\" ","Errors-To":"kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org"}}]