From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=115.124.30.110 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792489305; b=AZLaOj25VJQpENbqI+Jzwy0YIe2gehBPtucM1WXIlh5yU1SLjpQ94Lvj853uBPjPxnIn 1o/9ZnlgUTJNwhYDKZQf9/i5pXCLCleYrjISsZKPJXQ99+6M86GZ8iTuTVWyLhYWeIlWN EoOnzSXs7FEE8XyoPAu4GGnN1Pgn5esSGFW0W06DRwT803JDkSON/OKIhFlF5pLYhkS5q aviddO5cXq1lbOlKD5NEaI/k/qR8rXxEUCihpIalG8ARV5ZdElWjQ7foaKAzljul9H/Z3 yVzXIhjb3k7Serwq2zvGzMIEO/TW2K6WDZaqsLS1zkjeHbPefoBUxG3/j6y+qnL5Exw== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792489305; h=DMARC-Filter:DKIM-Signature:X-Alimail-AntiSpam:Received:From:To:Cc: Subject:Date:Message-Id:X-Mailer:In-Reply-To:References:MIME-Version: Content-Transfer-Encoding; bh=9s0bIlJ2piSguoXe1yWtoTyK6ceFUCEG2mwvMKkau2U=; b=u4IkR56zyUGOryB5mHF9KFZaIgVuLrufd8Tawi3xgD7ZQL7LaCERD/Yi+91tFI5pDFGI S8zp1Z85dSgJiIy0TTCTW9pALYRyAdaahLqOsofk3beeMCYpL4iEJSVdjd1yq5ILAnTO7 4/luo4Qj9Rgd7H0v2HhAWWfD2b0pkUCyjOBB5izPFq0JVhlZI0aIa15V7Y0bLksi8iEjn ROuwSi5HFpN573qnEF86xcE/MV6nSBDAVo9mBfvyhHXA8elCaJIbZGmeszTxasKmlklBd 1TYkRbZY+xxxjrHQpeJwWxuev5aUbf3nSPZki5QJEQP5fkbrOiuJyGQN+Iyb4KWWc4g== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass header.d=linux.alibaba.com header.i=@linux.alibaba.com header.a=rsa-sha256 header.s=default header.b="D7eP27/t"; arc=none smtp.remote-ip=115.124.30.110 Received: from out30-110.freemail.mail.aliyun.com (out30-110.freemail.mail.aliyun.com [115.124.30.110]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C315C606A323 for ; Tue, 20 Oct 2026 09:41:44 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org C315C606A323 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.a=rsa-sha256 header.s=default header.b=D7eP27/t DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1792489302; h=From:To:Subject:Date:Message-Id:MIME-Version; bh=9s0bIlJ2piSguoXe1yWtoTyK6ceFUCEG2mwvMKkau2U=; b=D7eP27/tp6z+BM6ed46hS9H/V7cxPryjgnAbHKQgFygpfhaDIZuBewbMw/eCdeV0p9tnbl4QwcuD3pqUFn7dRUDQd6ryTQZHGK+RaaztYHcIYMtYdxBsFx/9ik/LBe4h0ulAHBBonD283f6eTaIgtdWjnBrfd1ORyxql/JvpPnU= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R171e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam011083073210;MF=fangyu.yu@linux.alibaba.com;NM=1;PH=DS;RN=28;SR=0;TI=SMTPD_---0XDCspcv_1792489296; Received: from localhost.localdomain(mailfrom:fangyu.yu@linux.alibaba.com fp:SMTPD_---0XDCspcv_1792489296 cluster:ay36) by smtp.aliyun-inc.com; Tue, 20 Oct 2026 17:41:39 +0800 From: fangyu.yu@linux.alibaba.com To: tomasz.jeznach@linux.dev, joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu, alex@ghiti.fr, baolu.lu@linux.intel.com, jroedel@suse.de, zong.li@sifive.com, andrew.jones@linux.dev, anup@brainfault.org, jgg@nvidia.com, jgg@ziepe.ca, kevin.tian@intel.com, atish.patra@linux.dev, skhawaja@google.com, vasant.hegde@amd.com, joerg.roedel@amd.com, tanchi25@mails.ucas.ac.cn, gong.shuai@sanechips.com.cn Cc: fangyu.yu@linux.alibaba.com, guoren@kernel.org, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, kvm-riscv@lists.infradead.org Subject: [RFC PATCH v5 07/10] iommu/riscv: Add domain_alloc_paging_flags for second-stage domain Date: Tue, 20 Oct 2026 17:41:03 +0800 Message-Id: <20261020094106.92722-8-fangyu.yu@linux.alibaba.com> X-Mailer: git-send-email 2.39.3 (Apple Git-146) In-Reply-To: <20261020094106.92722-1-fangyu.yu@linux.alibaba.com> References: <20261020094106.92722-1-fangyu.yu@linux.alibaba.com> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Fangyu Yu Replace .domain_alloc_paging with .domain_alloc_paging_flags so callers can pass allocation flags to select the appropriate page-table type. When IOMMU_HWPT_ALLOC_NEST_PARENT or IOMMU_HWPT_ALLOC_DIRTY_TRACKING is set in @flags, allocate a second-stage (iohgatp) domain. When @flags is 0 the behaviour is identical to the previous domain_alloc_paging: first-stage (iosatp) domain. Signed-off-by: Fangyu Yu --- drivers/iommu/riscv/iommu.c | 94 +++++++++++++++++++++++++++---------- 1 file changed, 69 insertions(+), 25 deletions(-) diff --git a/drivers/iommu/riscv/iommu.c b/drivers/iommu/riscv/iommu.c index c31fb4c52205..debce1b4201c 100644 --- a/drivers/iommu/riscv/iommu.c +++ b/drivers/iommu/riscv/iommu.c @@ -1380,25 +1380,21 @@ static const struct iommu_domain_ops riscv_iommu_paging_domain_ops = { .flush_iotlb_all = riscv_iommu_iotlb_flush_all, }; -static struct iommu_domain *riscv_iommu_alloc_paging_domain(struct device *dev) +static struct iommu_domain * +riscv_iommu_domain_alloc_paging_flags(struct device *dev, u32 flags, + const struct iommu_user_data *user_data) { struct pt_iommu_riscv_64_cfg cfg = {}; struct riscv_iommu_domain *domain; struct riscv_iommu_device *iommu; int ret; + const u32 supported_flags = IOMMU_HWPT_ALLOC_DIRTY_TRACKING | + IOMMU_HWPT_ALLOC_NEST_PARENT; - iommu = dev_to_iommu(dev); - if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV57) { - cfg.common.hw_max_vasz_lg2 = 57; - } else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV48) { - cfg.common.hw_max_vasz_lg2 = 48; - } else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV39) { - cfg.common.hw_max_vasz_lg2 = 39; - } else { - dev_err(dev, "cannot find supported page table mode\n"); - return ERR_PTR(-ENODEV); - } - cfg.common.hw_max_oasz_lg2 = 56; + if (flags & ~supported_flags) + return ERR_PTR(-EOPNOTSUPP); + if (user_data) + return ERR_PTR(-EOPNOTSUPP); domain = kzalloc_obj(*domain); if (!domain) @@ -1406,12 +1402,13 @@ static struct iommu_domain *riscv_iommu_alloc_paging_domain(struct device *dev) INIT_LIST_HEAD_RCU(&domain->bonds); spin_lock_init(&domain->lock); + iommu = dev_to_iommu(dev); + cfg.common.hw_max_oasz_lg2 = 56; /* * 6.4 IOMMU capabilities [..] IOMMU implementations must support the * Svnapot standard extension for NAPOT Translation Contiguity. */ - cfg.common.features = BIT(PT_FEAT_SIGN_EXTEND) | - BIT(PT_FEAT_FLUSH_RANGE) | + cfg.common.features = BIT(PT_FEAT_FLUSH_RANGE) | BIT(PT_FEAT_RISCV_SVNAPOT_64K) | BIT(PT_FEAT_DETAILED_GATHER); if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SVPBMT) @@ -1419,19 +1416,66 @@ static struct iommu_domain *riscv_iommu_alloc_paging_domain(struct device *dev) domain->riscvpt.iommu.nid = dev_to_node(iommu->dev); domain->domain.ops = &riscv_iommu_paging_domain_ops; - domain->pscid = ida_alloc_range(&riscv_iommu_pscids, 1, - RISCV_IOMMU_MAX_PSCID, GFP_KERNEL); - if (domain->pscid < 0) { - riscv_iommu_free_paging_domain(&domain->domain); - return ERR_PTR(-ENOMEM); + switch (flags) { + case 0: + cfg.common.features |= BIT(PT_FEAT_SIGN_EXTEND); + if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV57) { + cfg.common.hw_max_vasz_lg2 = 57; + } else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV48) { + cfg.common.hw_max_vasz_lg2 = 48; + } else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV39) { + cfg.common.hw_max_vasz_lg2 = 39; + } else { + ret = -ENODEV; + goto err_free; + } + domain->pscid = ida_alloc_range(&riscv_iommu_pscids, 1, + RISCV_IOMMU_MAX_PSCID, GFP_KERNEL); + if (domain->pscid < 0) { + ret = -ENOMEM; + goto err_free; + } + break; + case IOMMU_HWPT_ALLOC_NEST_PARENT: + case IOMMU_HWPT_ALLOC_DIRTY_TRACKING: + case IOMMU_HWPT_ALLOC_DIRTY_TRACKING | IOMMU_HWPT_ALLOC_NEST_PARENT: + /* + * Second-stage (iohgatp) page table for KVM VFIO device + * pass-through and dirty tracking. The GPA space is 2 bits + * wider than the corresponding first-stage VA space (x4 root + * page table), so hw_max_vasz_lg2 values are 41/50/59. + */ + if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV57X4) { + cfg.common.hw_max_vasz_lg2 = 59; + } else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV48X4) { + cfg.common.hw_max_vasz_lg2 = 50; + } else if (iommu->caps & RISCV_IOMMU_CAPABILITIES_SV39X4) { + cfg.common.hw_max_vasz_lg2 = 41; + } else { + ret = -ENODEV; + goto err_free; + } + domain->gscid = ida_alloc_range(&riscv_iommu_gscids, 1, + RISCV_IOMMU_MAX_GSCID, GFP_KERNEL); + if (domain->gscid < 0) { + ret = -ENOMEM; + goto err_free; + } + cfg.common.features |= BIT(PT_FEAT_RISCV_S2); + break; + default: + ret = -EOPNOTSUPP; + goto err_free; } ret = pt_iommu_riscv_64_init(&domain->riscvpt, &cfg, GFP_KERNEL); - if (ret) { - riscv_iommu_free_paging_domain(&domain->domain); - return ERR_PTR(ret); - } + if (ret) + goto err_free; return &domain->domain; + +err_free: + riscv_iommu_free_paging_domain(&domain->domain); + return ERR_PTR(ret); } static int riscv_iommu_attach_blocking_domain(struct iommu_domain *iommu_domain, @@ -1566,7 +1610,7 @@ static const struct iommu_ops riscv_iommu_ops = { .identity_domain = &riscv_iommu_identity_domain, .blocked_domain = &riscv_iommu_blocking_domain, .release_domain = &riscv_iommu_blocking_domain, - .domain_alloc_paging = riscv_iommu_alloc_paging_domain, + .domain_alloc_paging_flags = riscv_iommu_domain_alloc_paging_flags, .device_group = riscv_iommu_device_group, .probe_device = riscv_iommu_probe_device, .release_device = riscv_iommu_release_device, -- 2.50.1