[{"id":3683461,"web_url":"http://patchwork.ozlabs.org/comment/3683461/","msgid":"<20260428133501.GE849557@ziepe.ca>","list_archive_url":null,"date":"2026-04-28T13:35:01","subject":"Re: [RFC PATCH 06/11] iommu/riscv: Add domain_alloc_paging_flags for\n second-stage domain","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 09:13:54PM +0800, fangyu.yu@linux.alibaba.com wrote:\n> From: Fangyu Yu \n> \n> Replace .domain_alloc_paging with .domain_alloc_paging_flags so callers\n> can pass allocation flags to select the appropriate page-table type.\n> \n> When IOMMU_HWPT_ALLOC_NEST_PARENT or IOMMU_HWPT_ALLOC_DIRTY_TRACKING is\n> set in @flags, allocate a second-stage (iohgatp) domain.\n> \n> When @flags is 0 the behaviour is identical to the previous\n> domain_alloc_paging: first-stage (iosatp) domain.\n> \n> Signed-off-by: Fangyu Yu \n> ---\n> drivers/iommu/riscv/iommu.c | 66 ++++++++++++++++++++++++++++---------\n> 1 file changed, 51 insertions(+), 15 deletions(-)\n> \n> diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c\n> index 5dadf6d09139..0c13430ecc7f 100644\n> --- a/drivers/iommu/riscv/iommu.c\n> +++ b/drivers/iommu/riscv/iommu.c\n> @@ -1255,23 +1255,50 @@ static const struct iommu_domain_ops riscv_iommu_paging_domain_ops = {\n> \t.flush_iotlb_all = riscv_iommu_iotlb_flush_all,\n> };\n> \n> -static struct iommu_domain *riscv_iommu_alloc_paging_domain(struct device *dev)\n> +static struct iommu_domain *riscv_iommu_domain_alloc_paging_flags(\n> +\t\tstruct device *dev, u32 flags,\n> +\t\tconst struct iommu_user_data *user_data)\n> {\n> +\tconst bool second_stage = flags &\n> +\t\t(IOMMU_HWPT_ALLOC_NEST_PARENT | IOMMU_HWPT_ALLOC_DIRTY_TRACKING);\n\nThis isn't the right logic, you should follow the switch/case design\nfrom other drivers.\n\n> \tstruct pt_iommu_riscv_64_cfg cfg = {};\n> \tstruct riscv_iommu_domain *domain;\n> \tstruct riscv_iommu_device *iommu;\n> \tint ret;\n> \n> +\tif (user_data)\n> +\t\treturn ERR_PTR(-EOPNOTSUPP);\n> +\n> \tiommu = dev_to_iommu(dev);\n> -\tif (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV57) {\n> -\t\tcfg.common.hw_max_vasz_lg2 = 57;\n> -\t} else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV48) {\n> -\t\tcfg.common.hw_max_vasz_lg2 = 48;\n> -\t} else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV39) {\n> -\t\tcfg.common.hw_max_vasz_lg2 = 39;\n> +\n> +\tif (second_stage) {\n> +\t\t/*\n> +\t\t * Second-stage (iohgatp) page table for KVM VFIO device\n> +\t\t * pass-through and dirty tracking. The GPA space is 2 bits\n> +\t\t * wider than the corresponding first-stage VA space (x4 root\n> +\t\t * page table), so hw_max_vasz_lg2 values are 41/50/59.\n> +\t\t */\n> +\t\tif (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV57X4) {\n> +\t\t\tcfg.common.hw_max_vasz_lg2 = 59;\n> +\t\t} else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV48X4) {\n> +\t\t\tcfg.common.hw_max_vasz_lg2 = 50;\n> +\t\t} else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV39X4) {\n> +\t\t\tcfg.common.hw_max_vasz_lg2 = 41;\n> +\t\t} else {\n> +\t\t\tdev_err(dev, \"cannot find supported second-stage page table mode\\n\");\n> +\t\t\treturn ERR_PTR(-ENODEV);\n\nDo not make log messages for failing system calls.\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=cK9rEuAk;\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=oyUn5tds;\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=DiU2nRqZ;\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 09:13:54PM +0800,\n fangyu.yu@linux.alibaba.com\n wrote: > From: Fangyu Yu > > Replace\n .domain_alloc_paging\n with .domain_alloc_paging_flags so callers [...]\n Content analysis details: (-0.2 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:f8b0:4864:20:0:0:0:830 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_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 0.1 DKIM_SIGNED Message has a DKIM or DK signature,\n not necessarily valid","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":3683765,"web_url":"http://patchwork.ozlabs.org/comment/3683765/","msgid":"<20260429012106.63618-1-fangyu.yu@linux.alibaba.com>","list_archive_url":null,"date":"2026-04-29T01:21:06","subject":"Re: Re: [RFC PATCH 06/11] iommu/riscv: Add domain_alloc_paging_flags\n for second-stage domain ","submitter":{"id":91416,"url":"http://patchwork.ozlabs.org/api/people/91416/","name":null,"email":"fangyu.yu@linux.alibaba.com"},"content":"Understood. I will rework the flags handling to follow the switch/case pattern\nused by other drivers, and remove the dev_err() on the failure path.\n\nThanks,\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=rPiWOVYI;\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=ietmYhrI;\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 4g4zz164NHz1xvV\n\tfor ; Wed, 29 Apr 2026 11:21:17 +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 1wHtc4-00000002i7t-0dO7;\n\tWed, 29 Apr 2026 01:21:16 +0000","from out30-111.freemail.mail.aliyun.com ([115.124.30.111])\n\tby bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux))\n\tid 1wHtc1-00000002i7W-2PMM;\n\tWed, 29 Apr 2026 01:21:14 +0000","from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com\n fp:SMTPD_---0X1vuGUZ_1777425666 cluster:ay36)\n by smtp.aliyun-inc.com;\n Wed, 29 Apr 2026 09:21:08 +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=x8BFOl2tKASUU0g6dkbqXXM+CFAHhFlHvJRV22gHB0k=; b=rPiWOVYIsYEAJs\n\tUPTEcv3UGzU/NbJ6bzV7n7CcuLZ/gUjOBjum7ynfWrCypwQxulUI0P1MajtDPwiHFOsOIiIxSWBXS\n\tMvCDhEn3fVn0vctfKlxUQ03uehscV0dfoFLbovUFEuwhrFEtxlCc8d0aK5O+tPtaa2rSyPUHni4A7\n\t12QjNdUi5NOwJTJ4mvcvK5SltzM5v95UCCSMNfzAefnzpmjm47YCtj3JM+D+Ppb7ysbCMApQFVtYU\n\tDrqkdoreV9TrHdR0h+aV5Dedy0so69BRHMrSFiyIw9McuiZLEMenoWypM1Uzlq17XYzBDMjWBec2/\n\twTIfiO8iNwWPn+tcqJpw==;","v=1; a=rsa-sha256; c=relaxed/relaxed;\n\td=linux.alibaba.com; s=default;\n\tt=1777425671; h=From:To:Subject:Date:Message-Id:MIME-Version;\n\tbh=7LnoYXtUgcLK+iuuo/ay/+wU4q11Fd3/PO7qvUkxaPc=;\n\tb=ietmYhrIthf4zgEGsMHAYg+ZxgGqEnenFRZYf81CFJEJcpZm9hXaZJs1CYDQWaNnX0fi7hxRgFdTrLe3HnVwLfSqCVVRn4H1ZstM/VifV3tFP/U7PZ/nEe2MDQ+7zg66FnsHgpyT7WedhNEnovCXfMpgiAyZYTEGhC0VbKg05oc="],"X-Alimail-AntiSpam":"\n AC=PASS;BC=-1|-1;BR=01201311R131e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033045133197;MF=fangyu.yu@linux.alibaba.com;NM=1;PH=DS;RN=22;SR=0;TI=SMTPD_---0X1vuGUZ_1777425666;","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 06/11] iommu/riscv: Add domain_alloc_paging_flags\n for second-stage domain ","Date":"Wed, 29 Apr 2026 09:21:06 +0800","Message-Id":"<20260429012106.63618-1-fangyu.yu@linux.alibaba.com>","X-Mailer":"git-send-email 2.39.3 (Apple Git-146)","In-Reply-To":"<20260428133501.GE849557@ziepe.ca>","References":"<20260428133501.GE849557@ziepe.ca>","MIME-Version":"1.0","X-CRM114-Version":"20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 ","X-CRM114-CacheID":"sfid-20260428_182113_817205_37465526 ","X-CRM114-Status":"UNSURE ( 3.37 )","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: Understood. I will rework the flags handling to follow the\n switch/case pattern used by other drivers, and remove the dev_err() on the\n failure path. Thanks, Fangyu >Jason\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 [115.124.30.111 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 -0.5 ENV_AND_HDR_SPF_MATCH Env and Hdr From used in default SPF WL Match\n 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay\n lines","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"}}]