[{"id":3683463,"web_url":"http://patchwork.ozlabs.org/comment/3683463/","msgid":"<20260428133641.GF849557@ziepe.ca>","list_archive_url":null,"date":"2026-04-28T13:36:41","subject":"Re: [RFC PATCH 07/11] iommupt: Don't preset D when RISC-V IOMMU\n dirty tracking on","submitter":{"id":73018,"url":"http://patchwork.ozlabs.org/api/people/73018/","name":"Jason Gunthorpe","email":"jgg@ziepe.ca"},"content":"On Tue, Apr 28, 2026 at 09:13:55PM +0800, fangyu.yu@linux.alibaba.com wrote:\n> From: Fangyu Yu \n> \n> When mapping writable pages, the RISC-V format code currently\n> pre-sets the PTE D bit unconditionally.\n> \n> If hardware dirty tracking is active (DC.tc.GADE set), the IOMMU\n> sets D autonomously on the first write. Pre-setting D makes every\n> new mapping appear dirty immediately and breaks dirty tracking.\n> \n> Introduce PT_FEAT_RISCV_DIRTY_TRACKING_ACTIVE and, when set, leave\n> D cleared for new writable mappings so hardware can capture the\n> first write. Keep pre-setting D when dirty tracking is inactive.\n> \n> Only meaningful for second-stage (iohgatp) page tables.\n\nYou shouldn't need anything like this, the D bit is managed by the\niommufd core appropriately. It *should* start out pre-set as that is\nfaster when not tacking. Only once dirty tracking is started does D\nget cleared. User space is supposed to assume that everything is dirty\nprior to its first D clear.\n\nJason","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=jWGqZY+p;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n secure) header.d=ziepe.ca header.i=@ziepe.ca header.a=rsa-sha256\n header.s=google header.b=eRm08gVy;\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; helo=bombadil.infradead.org;\n envelope-from=kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g4hLB5KJjz1xrS\n\tfor ; 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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 Tue, Apr 28, 2026 at 09:13:55PM +0800,\n fangyu.yu@linux.alibaba.com\n wrote: > From: Fangyu Yu > > When mapping\n writable\n pages, the RISC-V format code currently > pre-set [...]\n Content analysis details: (-2.1 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no\n trust\n [2607:f8b0:4864:20:0:0:0:732 listed in]\n [list.dnswl.org]\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -0.0 SPF_PASS SPF: sender matches 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_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\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 -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]","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"}},{"id":3683769,"web_url":"http://patchwork.ozlabs.org/comment/3683769/","msgid":"<20260429014105.66404-1-fangyu.yu@linux.alibaba.com>","list_archive_url":null,"date":"2026-04-29T01:41:05","subject":"Re: Re: [RFC PATCH 07/11] iommupt: Don't preset D when RISC-V IOMMU\n dirty tracking on ","submitter":{"id":91416,"url":"http://patchwork.ozlabs.org/api/people/91416/","name":null,"email":"fangyu.yu@linux.alibaba.com"},"content":">> From: Fangyu Yu \n>> \n>> When mapping writable pages, the RISC-V format code currently\n>> pre-sets the PTE D bit unconditionally.\n>> \n>> If hardware dirty tracking is active (DC.tc.GADE set), the IOMMU\n>> sets D autonomously on the first write. Pre-setting D makes every\n>> new mapping appear dirty immediately and breaks dirty tracking.\n>> \n>> Introduce PT_FEAT_RISCV_DIRTY_TRACKING_ACTIVE and, when set, leave\n>> D cleared for new writable mappings so hardware can capture the\n>> first write. Keep pre-setting D when dirty tracking is inactive.\n>> \n>> Only meaningful for second-stage (iohgatp) page tables.\n>\n>You shouldn't need anything like this, the D bit is managed by the\n>iommufd core appropriately. It *should* start out pre-set as that is\n>faster when not tacking. Only once dirty tracking is started does D\n>get cleared. User space is supposed to assume that everything is dirty\n>prior to its first D clear.\n>\n\nThanks, that makes sense. I will drop PT_FEAT_RISCV_DIRTY_TRACKING_ACTIVE\nand rely on the iommufd core to manage D bit.\n\nFangyu\n\n>Jason","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=WVGKROdP;\n\tdkim=fail reason=\"signature verification failed\" (2048-bit key;\n secure) header.d=infradead.org header.i=@infradead.org header.a=rsa-sha256\n header.s=desiato.20200630 header.b=abhByb7c;\n\tdkim=fail reason=\"signature verification failed\" (1024-bit key;\n unprotected) header.d=linux.alibaba.com header.i=@linux.alibaba.com\n header.a=rsa-sha256 header.s=default header.b=VSKdml4w;\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; helo=bombadil.infradead.org;\n envelope-from=kvm-riscv-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org;\n receiver=patchwork.ozlabs.org)"],"Received":["from bombadil.infradead.org (bombadil.infradead.org\n [IPv6:2607:7c80:54:3::133])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g50QT3Z53z1yHv\n\tfor ; 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If you have any questions, see\n the administrator of that system for details.\n Content preview: >> From: Fangyu Yu >> >> When\n mapping writable pages, the RISC-V format code currently >> pre-sets the\n PTE D bit unconditionally. >> >> If hardware dirty tracking is acti [...]\n Content analysis details: (-15.7 points, 5.0 required)\n pts rule name description\n ---- ----------------------\n --------------------------------------------------\n -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no\n trust\n [115.124.30.124 listed in list.dnswl.org]\n 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record\n -7.5 USER_IN_DEF_SPF_WL From: address is in the default SPF welcome-list\n -0.0 SPF_PASS SPF: sender matches SPF record\n -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM welcome-list\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from domain\n 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid\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 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay\n lines\n -0.5 ENV_AND_HDR_SPF_MATCH Env and Hdr From used in default SPF WL Match","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"}}]