[{"id":3683459,"web_url":"http://patchwork.ozlabs.org/comment/3683459/","msgid":"<20260428133239.GC849557@ziepe.ca>","list_archive_url":null,"date":"2026-04-28T13:32:39","subject":"Re: [RFC PATCH 01/11] iommupt: Add RISC-V Second-stage (iohgatp)\n page table support","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 09:13:49PM +0800, fangyu.yu@linux.alibaba.com wrote:\n> @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct pt_iommu_riscv_64 *iommu_table,\n> \tcase 57:\n> \t\tpt_top_set_level(&table->common, 4);\n> \t\tbreak;\n> +\t/*\n> +\t * Second-stage (iohgatp): Sv39x4 / Sv48x4 / Sv57x4.\n> +\t * The top level is the same as for the first-stage counterpart.\n> +\t */\n> +\tcase 41:\n> +\t\tpt_top_set_level(&table->common, 2);\n> +\t\ttable->second_stage = true;\n> +\t\tbreak;\n\nSecond stage needs to be an explicit PT_FEAT not implicitly deduced\nbased on the vasz.\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=xSd9Qzcf;\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=QVpx67lE;\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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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 09:13:49PM +0800,\n fangyu.yu@linux.alibaba.com\n wrote: > @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct\n pt_iommu_riscv_64\n *iommu_table, > case 57: > pt_top_set_level(&table-> [...]\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:c2c 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":3683759,"web_url":"http://patchwork.ozlabs.org/comment/3683759/","msgid":"<20260429010650.61646-1-fangyu.yu@linux.alibaba.com>","list_archive_url":null,"date":"2026-04-29T01:06:50","subject":"Re: Re: [RFC PATCH 01/11] iommupt: Add RISC-V Second-stage (iohgatp)\n page table support ","submitter":{"id":91416,"url":"http://patchwork.ozlabs.org/api/people/91416/","name":null,"email":"fangyu.yu@linux.alibaba.com"},"content":">> @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct pt_iommu_riscv_64 *iommu_table,\n>> \tcase 57:\n>> \t\tpt_top_set_level(&table->common, 4);\n>> \t\tbreak;\n>> +\t/*\n>> +\t * Second-stage (iohgatp): Sv39x4 / Sv48x4 / Sv57x4.\n>> +\t * The top level is the same as for the first-stage counterpart.\n>> +\t */\n>> +\tcase 41:\n>> +\t\tpt_top_set_level(&table->common, 2);\n>> +\t\ttable->second_stage = true;\n>> +\t\tbreak;\n>\n>Second stage needs to be an explicit PT_FEAT not implicitly deduced\n>based on the vasz.\n\nAgreed. I will add an explicit PT_FEAT_RISCV_SECOND_STAGE flag and\nstop deriving second-stage semantics from vasz.\n\nThanks,\nFangyu\n\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=2naFKiaF;\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=xUc/mCOL;\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 4g4zfx5VFrz1xvV\n\tfor ; Wed, 29 Apr 2026 11:07:13 +1000 (AEST)","from localhost ([::1] helo=bombadil.infradead.org)\n\tby bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1wHtOM-00000002h28-31tU;\n\tWed, 29 Apr 2026 01:07:06 +0000","from out30-133.freemail.mail.aliyun.com ([115.124.30.133])\n\tby bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1wHtOJ-00000002gzq-3Jc7;\n\tWed, 29 Apr 2026 01:07:05 +0000","from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com\n fp:SMTPD_---0X1vlBef_1777424814 cluster:ay36)\n by smtp.aliyun-inc.com;\n Wed, 29 Apr 2026 09:06:56 +0800"],"DKIM-Signature":["v=1; 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:MIME-Version:References:In-Reply-To:\n\tMessage-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:\n\tResent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:\n\tList-Owner; bh=shgBDlBSS4Jxs7Onwv+fuLw0QEAP+IZMvxC+DHIbNm0=; b=2naFKiaF9XyahF\n\tIdGbbGtwUqEU4I690uSaPHtE9ahGqL3JpCpkWAApXrE0xIlSKhmsvDz4NXqljtI6oxiX7Af0bQHFW\n\t9/COUQrxNVv91u4cdftVarQd+FK5XOFdFszV4n8yWnYn8HHZeYhyVzHp3zKsboLmJAG5Xr9MXWTBZ\n\tI3sjFovUybOnHVYlMP/oWUsn3cwQO9ivRGQhXgAxE0FxFl7BPu5lhhzl24bV1mtjS8aMEfI5MNtT0\n\tYmSC+Gypo7mEbpdX80d3J/jUutYUnopi3Cyfc1K2JrrjYs7oRUqTp4NRBS1q+hLTQrDkzmNKWR3RX\n\tDJEPQwKnrW4TipE5nimg==;","v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=linux.alibaba.com; s=default;\n\tt=1777424820; h=From:To:Subject:Date:Message-Id:MIME-Version;\n\tbh=ZIGgm1LnnTKQYeHSW75Afg46i5j+k0U/fuPrhUWSwJ4=;\n\tb=xUc/mCOL+4iTxg74PtcrlTrgAnqcdzd6s9rdaFQNCT2Kuq0J0FQDHEJwooTuN3Bq3nooKe8fSWR79nym0rdfIwQ4+x5Sh5Xws+7kS8DZbzCyY09/6v6OaZZ/dDuKhzE6XvWrZZja3mC4by2Q6StQHXh0fATBBrRjCsvJOH7wQes="],"X-Alimail-AntiSpam":"\n AC=PASS;BC=-1|-1;BR=01201311R361e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033037026112;MF=fangyu.yu@linux.alibaba.com;NM=1;PH=DS;RN=22;SR=0;TI=SMTPD_---0X1vlBef_1777424814;","From":"fangyu.yu@linux.alibaba.com","To":"jgg@ziepe.ca","Cc":"alex@ghiti.fr,\n\tanup@brainfault.org,\n\taou@eecs.berkeley.edu,\n\tatish.patra@linux.dev,\n\tbaolu.lu@linux.intel.com,\n\tfangyu.yu@linux.alibaba.com,\n\tguoren@kernel.org,\n\tiommu@lists.linux.dev,\n\tjoro@8bytes.org,\n\tkevin.tian@intel.com,\n\tkvm-riscv@lists.infradead.org,\n\tkvm@vger.kernel.org,\n\tlinux-kernel@vger.kernel.org,\n\tlinux-riscv@lists.infradead.org,\n\tpalmer@dabbelt.com,\n\tpjw@kernel.org,\n\trobin.murphy@arm.com,\n\tskhawaja@google.com,\n\ttjeznach@rivosinc.com,\n\tvasant.hegde@amd.com,\n\twill@kernel.org","Subject":"Re: Re: [RFC PATCH 01/11] iommupt: Add RISC-V Second-stage (iohgatp)\n page table support ","Date":"Wed, 29 Apr 2026 09:06:50 +0800","Message-Id":"<20260429010650.61646-1-fangyu.yu@linux.alibaba.com>","X-Mailer":"git-send-email 2.39.3 (Apple Git-146)","In-Reply-To":"<20260428133239.GC849557@ziepe.ca>","References":"<20260428133239.GC849557@ziepe.ca>","MIME-Version":"1.0","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20260428_180704_504864_96C87F75 ","X-CRM114-Status":"UNSURE ( 4.98 )","X-CRM114-Notice":"Please train this message.","X-Spam-Score":"-17.6 (-----------------)","X-Spam-Report":"Spam detection software,\n running on the system \"bombadil.infradead.org\",\n has NOT identified this incoming email as spam. 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: >> @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct\n pt_iommu_riscv_64\n *iommu_table, >> case 57: >> pt_top_set_level(&table->common, 4);\n >> break;\n >> + /* >> + * Second-stage (iohgatp): Sv39x4 / Sv48 [...]\n Content analysis details: (-17.6 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 [115.124.30.133 listed in list.dnswl.org]\n -7.5 USER_IN_DEF_SPF_WL From: address is in the default SPF welcome-list\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 -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 -1.9 BAYES_00 BODY: Bayes spam probability is 0 to 1%\n [score: 0.0000]\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"}},{"id":3684019,"web_url":"http://patchwork.ozlabs.org/comment/3684019/","msgid":"<20260429121820.GL849557@ziepe.ca>","list_archive_url":null,"date":"2026-04-29T12:18:20","subject":"Re: Re: [RFC PATCH 01/11] iommupt: Add RISC-V Second-stage (iohgatp)\n page table support","submitter":{"id":73018,"url":"http://patchwork.ozlabs.org/api/people/73018/","name":"Jason Gunthorpe","email":"jgg@ziepe.ca"},"content":"On Wed, Apr 29, 2026 at 09:06:50AM +0800, fangyu.yu@linux.alibaba.com wrote:\n> >> @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct pt_iommu_riscv_64 *iommu_table,\n> >> \tcase 57:\n> >> \t\tpt_top_set_level(&table->common, 4);\n> >> \t\tbreak;\n> >> +\t/*\n> >> +\t * Second-stage (iohgatp): Sv39x4 / Sv48x4 / Sv57x4.\n> >> +\t * The top level is the same as for the first-stage counterpart.\n> >> +\t */\n> >> +\tcase 41:\n> >> +\t\tpt_top_set_level(&table->common, 2);\n> >> +\t\ttable->second_stage = true;\n> >> +\t\tbreak;\n> >\n> >Second stage needs to be an explicit PT_FEAT not implicitly deduced\n> >based on the vasz.\n> \n> Agreed. I will add an explicit PT_FEAT_RISCV_SECOND_STAGE flag and\n> stop deriving second-stage semantics from vasz.\n\nPT_FEAT_RISCV_S2 would match what I have for ARM\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=gJvjenQc;\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=PEwS3tC+;\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 4g5GYJ5vdwz1yHZ\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 Wed, Apr 29, 2026 at 09:06:50AM +0800,\n fangyu.yu@linux.alibaba.com\n wrote: > >> @@ -263,6 +281,22 @@ riscvpt_iommu_fmt_init(struct\n pt_iommu_riscv_64\n *iommu_table, > >> case 57: > >> pt_top_set_level [...]\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:f8b0:4864:20:0:0:0:72b 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_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 -0.1 DKIM_VALID Message has at least one valid DKIM or DK\n signature\n -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from\n envelope-from 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"}}]