From nobody Wed Feb 11 02:06:25 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4A152C7EE23 for ; Thu, 11 May 2023 14:43:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238694AbjEKOnQ (ORCPT ); Thu, 11 May 2023 10:43:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35944 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238016AbjEKOmb (ORCPT ); Thu, 11 May 2023 10:42:31 -0400 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BA12110E40; Thu, 11 May 2023 07:38:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1683815932; x=1715351932; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HbmzlsdSkuEhZruXf7dIWqcPWSG5KyYfb9S8kTNAT1U=; b=RFVYxI43D3nL6XkJ+iX5c2CkBJv1Zp0m9qhi2Ozm0ewiYshbnau0d3MM 8lA/cMoW1UPlkHnNWvOYdm3OFi/AkCpI31KbKFJ6OnlFvNpCzdE5pDJX9 fhrAiZx+fF2YRmslYcYj/tTpC7SKXT+/RyJ+WypV9EDW/NYw+CQHWKSZA G/82/P4Q3DwZDarHggHekJTUXItv8/HrvzYAgGTWurs+pTrt3tMX6kN00 UfxXSEQi4HqvQdWmOAGco8xqOSUJ3xpNs+qupC7hfOBhG834UvlLTOMT5 W9946kjwepOOYyEuCyXYAbLEh8xaSSIHlTseAckXLe4IrBq2XRIKfFn0H A==; X-IronPort-AV: E=McAfee;i="6600,9927,10707"; a="339812912" X-IronPort-AV: E=Sophos;i="5.99,266,1677571200"; d="scan'208";a="339812912" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 May 2023 07:38:50 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10707"; a="730382622" X-IronPort-AV: E=Sophos;i="5.99,266,1677571200"; d="scan'208";a="730382622" Received: from 984fee00a4c6.jf.intel.com ([10.165.58.231]) by orsmga008.jf.intel.com with ESMTP; 11 May 2023 07:38:49 -0700 From: Yi Liu To: joro@8bytes.org, alex.williamson@redhat.com, jgg@nvidia.com, kevin.tian@intel.com, robin.murphy@arm.com, baolu.lu@linux.intel.com Cc: cohuck@redhat.com, eric.auger@redhat.com, nicolinc@nvidia.com, kvm@vger.kernel.org, mjrosato@linux.ibm.com, chao.p.peng@linux.intel.com, yi.l.liu@intel.com, yi.y.sun@linux.intel.com, peterx@redhat.com, jasowang@redhat.com, shameerali.kolothum.thodi@huawei.com, lulu@redhat.com, suravee.suthikulpanit@amd.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, zhenzhong.duan@intel.com Subject: [PATCH v2 06/11] iommufd: IOMMU_HWPT_ALLOC allocation with user data Date: Thu, 11 May 2023 07:38:39 -0700 Message-Id: <20230511143844.22693-7-yi.l.liu@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20230511143844.22693-1-yi.l.liu@intel.com> References: <20230511143844.22693-1-yi.l.liu@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" IOMMU_HWPT_ALLOC already supports iommu_domain allocation for usersapce. But it can only allocate hw_pagetables linked with IOAS. There are needs to support hw_pagetable allocation with parameters specified by user. For example, in nested translation, user needs to allocate hw_pagetable for the stage-1 translation (e.g. a single I/O page table or a set of I/O page tables) with user data. It also needs provide a stage-2 hw_pagetable which is linked to the GPA IOAS. This extends IOMMU_HWPT_ALLOC to accept user specified parameter and hwpt ID in @pt_id field. Such as the user-managed stage-1 hwpt, which requires a parent hwpt to point to stage-2 translation. enum iommu_hwpt_type is defined to differentiate the user parameters use by different usages. For the allocations that don't require user parameter, IOMMU_HWPT_TYPE_DEFAULT is defined for backward compatibility. Other types would be added by future iommu vendor driver extensions. Co-developed-by: Nicolin Chen Signed-off-by: Nicolin Chen Signed-off-by: Yi Liu --- drivers/iommu/iommufd/hw_pagetable.c | 87 +++++++++++++++++++++++++--- drivers/iommu/iommufd/main.c | 2 +- include/uapi/linux/iommufd.h | 32 +++++++++- 3 files changed, 112 insertions(+), 9 deletions(-) diff --git a/drivers/iommu/iommufd/hw_pagetable.c b/drivers/iommu/iommufd/h= w_pagetable.c index 73d7d9d07726..e84270eb6e49 100644 --- a/drivers/iommu/iommufd/hw_pagetable.c +++ b/drivers/iommu/iommufd/hw_pagetable.c @@ -184,11 +184,15 @@ iommufd_hw_pagetable_alloc(struct iommufd_ctx *ictx, = struct iommufd_ioas *ioas, =20 int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) { + struct iommufd_hw_pagetable *hwpt, *parent =3D NULL; + union iommu_domain_user_data *data =3D NULL; struct iommu_hwpt_alloc *cmd =3D ucmd->cmd; - struct iommufd_hw_pagetable *hwpt; + struct iommufd_object *pt_obj; + const struct iommu_ops *ops; struct iommufd_device *idev; struct iommufd_ioas *ioas; - int rc; + int klen =3D 0; + int rc =3D 0; =20 if (cmd->flags || cmd->__reserved) return -EOPNOTSUPP; @@ -197,15 +201,81 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) if (IS_ERR(idev)) return PTR_ERR(idev); =20 - ioas =3D iommufd_get_ioas(ucmd->ictx, cmd->pt_id); - if (IS_ERR(ioas)) { - rc =3D PTR_ERR(ioas); + ops =3D dev_iommu_ops(idev->dev); + + /* + * All drivers support IOMMU_HWPT_TYPE_DEFAULT, so pass it through. + * For any other hwpt_type, check the ops->domain_alloc_user_data_len + * presence and its result. + */ + if (cmd->hwpt_type !=3D IOMMU_HWPT_TYPE_DEFAULT) { + if (!ops->domain_alloc_user_data_len) { + rc =3D -EOPNOTSUPP; + goto out_put_idev; + } + klen =3D ops->domain_alloc_user_data_len(cmd->hwpt_type); + if (WARN_ON(klen < 0)) { + rc =3D -EINVAL; + goto out_put_pt; + } + } + + pt_obj =3D iommufd_get_object(ucmd->ictx, cmd->pt_id, IOMMUFD_OBJ_ANY); + if (IS_ERR(pt_obj)) { + rc =3D -EINVAL; goto out_put_idev; } =20 + switch (pt_obj->type) { + case IOMMUFD_OBJ_IOAS: + ioas =3D container_of(pt_obj, struct iommufd_ioas, obj); + break; + case IOMMUFD_OBJ_HW_PAGETABLE: + /* pt_id points HWPT only when hwpt_type is !IOMMU_HWPT_TYPE_DEFAULT */ + if (cmd->hwpt_type =3D=3D IOMMU_HWPT_TYPE_DEFAULT) { + rc =3D -EINVAL; + goto out_put_pt; + } + + parent =3D container_of(pt_obj, struct iommufd_hw_pagetable, obj); + /* + * Cannot allocate user-managed hwpt linking to auto_created + * hwpt. If the parent hwpt is already a user-managed hwpt, + * don't allocate another user-managed hwpt linking to it. + */ + if (parent->auto_domain || parent->parent) { + rc =3D -EINVAL; + goto out_put_pt; + } + ioas =3D parent->ioas; + break; + default: + rc =3D -EINVAL; + goto out_put_pt; + } + + if (klen) { + if (!cmd->data_len) { + rc =3D -EINVAL; + goto out_put_pt; + } + + data =3D kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) { + rc =3D -ENOMEM; + goto out_put_pt; + } + + rc =3D copy_struct_from_user(data, sizeof(*data), + u64_to_user_ptr(cmd->data_uptr), + cmd->data_len); + if (rc) + goto out_free_data; + } + mutex_lock(&ioas->mutex); hwpt =3D iommufd_hw_pagetable_alloc(ucmd->ictx, ioas, idev, - NULL, NULL, false); + parent, data, false); if (IS_ERR(hwpt)) { rc =3D PTR_ERR(hwpt); goto out_unlock; @@ -222,7 +292,10 @@ int iommufd_hwpt_alloc(struct iommufd_ucmd *ucmd) iommufd_object_abort_and_destroy(ucmd->ictx, &hwpt->obj); out_unlock: mutex_unlock(&ioas->mutex); - iommufd_put_object(&ioas->obj); +out_free_data: + kfree(data); +out_put_pt: + iommufd_put_object(pt_obj); out_put_idev: iommufd_put_object(&idev->obj); return rc; diff --git a/drivers/iommu/iommufd/main.c b/drivers/iommu/iommufd/main.c index 5c24e8971f09..ac81403ba78e 100644 --- a/drivers/iommu/iommufd/main.c +++ b/drivers/iommu/iommufd/main.c @@ -302,7 +302,7 @@ struct iommufd_ioctl_op { static const struct iommufd_ioctl_op iommufd_ioctl_ops[] =3D { IOCTL_OP(IOMMU_DESTROY, iommufd_destroy, struct iommu_destroy, id), IOCTL_OP(IOMMU_HWPT_ALLOC, iommufd_hwpt_alloc, struct iommu_hwpt_alloc, - __reserved), + data_uptr), IOCTL_OP(IOMMU_DEVICE_GET_HW_INFO, iommufd_device_get_hw_info, struct iommu_hw_info, __reserved), IOCTL_OP(IOMMU_IOAS_ALLOC, iommufd_ioas_alloc_ioctl, diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h index e9d42838dcbd..699e735828db 100644 --- a/include/uapi/linux/iommufd.h +++ b/include/uapi/linux/iommufd.h @@ -347,6 +347,14 @@ struct iommu_vfio_ioas { }; #define IOMMU_VFIO_IOAS _IO(IOMMUFD_TYPE, IOMMUFD_CMD_VFIO_IOAS) =20 +/** + * enum iommu_hwpt_type - IOMMU HWPT Type + * @IOMMU_HWPT_TYPE_DEFAULT: default + */ +enum iommu_hwpt_type { + IOMMU_HWPT_TYPE_DEFAULT, +}; + /** * struct iommu_hwpt_alloc - ioctl(IOMMU_HWPT_ALLOC) * @size: sizeof(struct iommu_hwpt_alloc) @@ -355,12 +363,31 @@ struct iommu_vfio_ioas { * @pt_id: The IOAS to connect this HWPT to * @out_hwpt_id: The ID of the new HWPT * @__reserved: Must be 0 + * @hwpt_type: One of enum iommu_hwpt_type + * @data_len: Length of the type specific data + * @data_uptr: User pointer to the type specific data * * Explicitly allocate a hardware page table object. This is the same obje= ct * type that is returned by iommufd_device_attach() and represents the * underlying iommu driver's iommu_domain kernel object. * - * A HWPT will be created with the IOVA mappings from the given IOAS. + * A kernel-managed HWPT will be created with the mappings from the given = IOAS. + * The @hwpt_type for its allocation can be set to IOMMU_HWPT_TYPE_DEFAULT= , or + * another type (being listed below) to specialize a kernel-managed HWPT. + * + * A user-managed HWPT will be created from a given parent HWPT via @pt_id= , in + * which the parent HWPT must be allocated previously via the same ioctl f= rom a + * given IOAS. The @hwpt_type must not be set to IOMMU_HWPT_TYPE_DEFAULT b= ut a + * pre-defined type corresponding to the underlying IOMMU hardware. + * + * If the @hwpt_type is set to IOMMU_HWPT_TYPE_DEFAULT, both the @data_len= and + * the @data_uptr will be ignored. Otherwise, both of them must be given. + * + * +=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D+=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D+ + * | @hwpt_type | Data structure in @data_uptr | = @pt_id | + * +------------------------------+-------------------------------------+-= ----------+ + * | IOMMU_HWPT_TYPE_DEFAULT | N/A | = IOAS | + * +------------------------------+-------------------------------------+-= ----------+ */ struct iommu_hwpt_alloc { __u32 size; @@ -369,6 +396,9 @@ struct iommu_hwpt_alloc { __u32 pt_id; __u32 out_hwpt_id; __u32 __reserved; + __u32 hwpt_type; + __u32 data_len; + __aligned_u64 data_uptr; }; #define IOMMU_HWPT_ALLOC _IO(IOMMUFD_TYPE, IOMMUFD_CMD_HWPT_ALLOC) =20 --=20 2.34.1