From patchwork Tue Nov 8 00:52:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jason Gunthorpe X-Patchwork-Id: 13035651 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B9ABBC4332F for ; Tue, 8 Nov 2022 00:54:01 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id E300F10E3A1; Tue, 8 Nov 2022 00:53:15 +0000 (UTC) Received: from NAM11-BN8-obe.outbound.protection.outlook.com (mail-bn8nam11on2041.outbound.protection.outlook.com [40.107.236.41]) by gabe.freedesktop.org (Postfix) with ESMTPS id 65C1210E377; Tue, 8 Nov 2022 00:53:00 +0000 (UTC) ARC-Seal: i=1; a=rsa-sha256; s=arcselector9901; d=microsoft.com; cv=none; b=dX/sq74LT/VXUxGL04fTT4LhGBcPz+1oX0zRGrO0G5PQRfozc4cY8gwsnbk59CJIesFQxmKACNH9rqeq8pieOACxG5uZF8cT+1tEse4fmZkCPvnSb0L4skle1HdFDBJ5sDP5SQ6rMF5xK0DrYBlILFm2unPMWLNnKku5NKuSiSFdi7Jda536Zu1Tj8lz7T44frjFHrbswZmSGQPT7xNy8xLDSjfDf4InXA0cSjqRLF5B2vcPtzXWQ780PaNkQA6YxYHrZVWMYew1a/R9ZY75OSyx3+LW5VcpMPquCzTZ4we96wfmP3HPFOWhnAXQIBFc3c9osBcB3GSdUM166dJumQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=microsoft.com; s=arcselector9901; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-AntiSpam-MessageData-ChunkCount:X-MS-Exchange-AntiSpam-MessageData-0:X-MS-Exchange-AntiSpam-MessageData-1; bh=NMPVjdp/yeQqS9T3S/+MSPh/DWIP0PGaWHsUyjLwwrk=; b=PLvMDF4PEXV0YkAWccrZrxGAna7r0z34kfvjMku55f5kwiaXWo1/90yDiErAjT1cXYBzgN5BAOdwEbDwFPf+r7dBCSCzHOAAwqMlWQfyI3gLhvrfOOUYNc/TmKpcXODNN04VQba9D1etR/OvIQxLRIb4zyR3a2ed0x03CGc9IbHnVA8JN33pLBXcyxGt+7FTdC9vb9T28/aJN+zOAxg/e2E+egHeaPOWfAo5DIGLUdzLtwLPAZ2qBc8t+cHpwnXy3/Pnijkh6hzeDjwhBtqKNzgFGUVq9ClND4ZCg8JUeV28q+zThoYFhXXsDMNl/qyeQiBqhxh3IwwEhhtTdIPQWA== ARC-Authentication-Results: i=1; mx.microsoft.com 1; spf=pass smtp.mailfrom=nvidia.com; dmarc=pass action=none header.from=nvidia.com; dkim=pass header.d=nvidia.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=Nvidia.com; s=selector2; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version:X-MS-Exchange-SenderADCheck; bh=NMPVjdp/yeQqS9T3S/+MSPh/DWIP0PGaWHsUyjLwwrk=; b=ua3rX1ENClsypLxzdx7m9wCAofrYEKCUP5Sb88vhtpxmDirp0GMkTzis/wxVWoceQ/ft0lPmwTzsMYlxgSaOGkbMTUH/k5N81Ynffn+5Er6J/FpghJCIpvPZ0uyllgpuJwdYeBF0jK/IhYDH2XAelRsNA59y75UDTvPeYVlUS2vNp3Jm53axcUfftTSUHBU0HgS/nOt9WsO+yj+PuBxSdQEhCbTAHvLcdxNw6Pb5WRA0bb1FkswhuUGhm3fxtYFXsa1VFOCkqFYMgskNxPbI6unaufXmvPYWrJILqzQs16/tdJMSPO8FE02gfN3zj3IMTrDuA001TlOIdc+qpH2yzg== Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=nvidia.com; Received: from LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) by SJ0PR12MB6686.namprd12.prod.outlook.com (2603:10b6:a03:479::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.5791.26; Tue, 8 Nov 2022 00:52:58 +0000 Received: from LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::7a81:a4e4:bb9c:d1de]) by LV2PR12MB5869.namprd12.prod.outlook.com ([fe80::7a81:a4e4:bb9c:d1de%6]) with mapi id 15.20.5791.026; Tue, 8 Nov 2022 00:52:58 +0000 From: Jason Gunthorpe To: Alexander Gordeev , David Airlie , Tony Krowiak , Alex Williamson , Christian Borntraeger , Cornelia Huck , Daniel Vetter , Diana Craciun , dri-devel@lists.freedesktop.org, Eric Auger , Eric Farman , Harald Freudenberger , Vasily Gorbik , Heiko Carstens , intel-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, iommu@lists.linux.dev, Jani Nikula , Jason Herne , Joonas Lahtinen , Joerg Roedel , Kevin Tian , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Longfang Liu , Matthew Rosato , Peter Oberparleiter , Halil Pasic , Robin Murphy , Rodrigo Vivi , Shameer Kolothum , Sven Schnelle , Tvrtko Ursulin , Vineeth Vijayan , Will Deacon , Yishai Hadas , Zhenyu Wang , Zhi Wang Date: Mon, 7 Nov 2022 20:52:50 -0400 Message-Id: <6-v2-65016290f146+33e-vfio_iommufd_jgg@nvidia.com> In-Reply-To: <0-v2-65016290f146+33e-vfio_iommufd_jgg@nvidia.com> References: X-ClientProxiedBy: BL1PR13CA0140.namprd13.prod.outlook.com (2603:10b6:208:2bb::25) To LV2PR12MB5869.namprd12.prod.outlook.com (2603:10b6:408:176::16) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: LV2PR12MB5869:EE_|SJ0PR12MB6686:EE_ X-MS-Office365-Filtering-Correlation-Id: edf24265-2c26-4e70-2d2f-08dac1239338 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:255.255.255.255; CTRY:; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:LV2PR12MB5869.namprd12.prod.outlook.com; PTR:; CAT:NONE; SFS:(13230022)(4636009)(366004)(396003)(39860400002)(376002)(136003)(346002)(451199015)(2616005)(921005)(83380400001)(38100700002)(186003)(2906002)(7416002)(7406005)(8936002)(86362001)(5660300002)(478600001)(6666004)(6486002)(26005)(6512007)(6506007)(66476007)(66556008)(8676002)(4326008)(316002)(41300700001)(110136005)(54906003)(66946007)(36756003)(4216001); DIR:OUT; SFP:1101; X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: edf24265-2c26-4e70-2d2f-08dac1239338 X-MS-Exchange-CrossTenant-AuthSource: LV2PR12MB5869.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Nov 2022 00:52:56.6638 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: adWENP0Ay32usNvgVjAFndnF7XuxhYlEXl+vKVZMpFBVzR6hIPmO59rjGwgRz/UH X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB6686 Subject: [Intel-gfx] [PATCH v2 06/11] vfio-iommufd: Allow iommufd to be used in place of a container fd X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Liu, Yi L" , Nicolin Chen , Lu Baolu Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" This makes VFIO_GROUP_SET_CONTAINER accept both a vfio container FD and an iommufd. In iommufd mode an IOAS will exist after the SET_CONTAINER, but it will not be attached to any groups. For VFIO this means that the VFIO_GROUP_GET_STATUS and VFIO_GROUP_FLAGS_VIABLE works subtly differently. With the container FD the iommu_group_claim_dma_owner() is done during SET_CONTAINER but for IOMMUFD this is done during VFIO_GROUP_GET_DEVICE_FD. Meaning that VFIO_GROUP_FLAGS_VIABLE could be set but GET_DEVICE_FD will fail due to viability. As GET_DEVICE_FD can fail for many reasons already this is not expected to be a meaningful difference. Reorganize the tests for if the group has an assigned container or iommu into a vfio_group_has_iommu() function and consolidate all the duplicated WARN_ON's etc related to this. Call container functions only if a container is actually present on the group. Tested-by: Nicolin Chen Signed-off-by: Jason Gunthorpe Reviewed-by: Kevin Tian --- drivers/vfio/Kconfig | 1 + drivers/vfio/container.c | 7 +++- drivers/vfio/vfio.h | 2 + drivers/vfio/vfio_main.c | 86 +++++++++++++++++++++++++++++++++------- 4 files changed, 80 insertions(+), 16 deletions(-) diff --git a/drivers/vfio/Kconfig b/drivers/vfio/Kconfig index 86c381ceb9a1e9..1118d322eec97d 100644 --- a/drivers/vfio/Kconfig +++ b/drivers/vfio/Kconfig @@ -2,6 +2,7 @@ menuconfig VFIO tristate "VFIO Non-Privileged userspace driver framework" select IOMMU_API + depends on IOMMUFD || !IOMMUFD select VFIO_IOMMU_TYPE1 if MMU && (X86 || S390 || ARM || ARM64) select INTERVAL_TREE help diff --git a/drivers/vfio/container.c b/drivers/vfio/container.c index d97747dfb05d02..8772dad6808539 100644 --- a/drivers/vfio/container.c +++ b/drivers/vfio/container.c @@ -516,8 +516,11 @@ int vfio_group_use_container(struct vfio_group *group) { lockdep_assert_held(&group->group_lock); - if (!group->container || !group->container->iommu_driver || - WARN_ON(!group->container_users)) + /* + * The container fd has been assigned with VFIO_GROUP_SET_CONTAINER but + * VFIO_SET_IOMMU hasn't been done yet. + */ + if (!group->container->iommu_driver) return -EINVAL; if (group->type == VFIO_NO_IOMMU && !capable(CAP_SYS_RAWIO)) diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h index 247590334e14b0..985e13d52989ca 100644 --- a/drivers/vfio/vfio.h +++ b/drivers/vfio/vfio.h @@ -10,6 +10,7 @@ #include #include +struct iommufd_ctx; struct iommu_group; struct vfio_device; struct vfio_container; @@ -60,6 +61,7 @@ struct vfio_group { struct kvm *kvm; struct file *opened_file; struct blocking_notifier_head notifier; + struct iommufd_ctx *iommufd; }; /* events for the backend driver notify callback */ diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c index 5c0e810f8b4d08..8c124290ce9f0d 100644 --- a/drivers/vfio/vfio_main.c +++ b/drivers/vfio/vfio_main.c @@ -35,6 +35,7 @@ #include #include #include +#include #include "vfio.h" #define DRIVER_VERSION "0.3" @@ -665,6 +666,16 @@ EXPORT_SYMBOL_GPL(vfio_unregister_group_dev); /* * VFIO Group fd, /dev/vfio/$GROUP */ +static bool vfio_group_has_iommu(struct vfio_group *group) +{ + lockdep_assert_held(&group->group_lock); + if (!group->container) + WARN_ON(group->container_users); + else + WARN_ON(!group->container_users); + return group->container || group->iommufd; +} + /* * VFIO_GROUP_UNSET_CONTAINER should fail if there are other users or * if there was no container to unset. Since the ioctl is called on @@ -676,15 +687,21 @@ static int vfio_group_ioctl_unset_container(struct vfio_group *group) int ret = 0; mutex_lock(&group->group_lock); - if (!group->container) { + if (!vfio_group_has_iommu(group)) { ret = -EINVAL; goto out_unlock; } - if (group->container_users != 1) { - ret = -EBUSY; - goto out_unlock; + if (group->container) { + if (group->container_users != 1) { + ret = -EBUSY; + goto out_unlock; + } + vfio_group_detach_container(group); + } + if (group->iommufd) { + iommufd_ctx_put(group->iommufd); + group->iommufd = NULL; } - vfio_group_detach_container(group); out_unlock: mutex_unlock(&group->group_lock); @@ -695,6 +712,7 @@ static int vfio_group_ioctl_set_container(struct vfio_group *group, int __user *arg) { struct vfio_container *container; + struct iommufd_ctx *iommufd; struct fd f; int ret; int fd; @@ -707,7 +725,7 @@ static int vfio_group_ioctl_set_container(struct vfio_group *group, return -EBADF; mutex_lock(&group->group_lock); - if (group->container || WARN_ON(group->container_users)) { + if (vfio_group_has_iommu(group)) { ret = -EINVAL; goto out_unlock; } @@ -717,12 +735,28 @@ static int vfio_group_ioctl_set_container(struct vfio_group *group, } container = vfio_container_from_file(f.file); - ret = -EINVAL; if (container) { ret = vfio_container_attach_group(container, group); goto out_unlock; } + iommufd = iommufd_ctx_from_file(f.file); + if (!IS_ERR(iommufd)) { + u32 ioas_id; + + ret = iommufd_vfio_compat_ioas_id(iommufd, &ioas_id); + if (ret) { + iommufd_ctx_put(group->iommufd); + goto out_unlock; + } + + group->iommufd = iommufd; + goto out_unlock; + } + + /* The FD passed is not recognized. */ + ret = -EBADFD; + out_unlock: mutex_unlock(&group->group_lock); fdput(f); @@ -752,9 +786,16 @@ static int vfio_device_first_open(struct vfio_device *device) * during close_device. */ mutex_lock(&device->group->group_lock); - ret = vfio_group_use_container(device->group); - if (ret) + if (!vfio_group_has_iommu(device->group)) { + ret = -EINVAL; goto err_module_put; + } + + if (device->group->container) { + ret = vfio_group_use_container(device->group); + if (ret) + goto err_module_put; + } device->kvm = device->group->kvm; if (device->ops->open_device) { @@ -762,13 +803,15 @@ static int vfio_device_first_open(struct vfio_device *device) if (ret) goto err_container; } - vfio_device_container_register(device); + if (device->group->container) + vfio_device_container_register(device); mutex_unlock(&device->group->group_lock); return 0; err_container: device->kvm = NULL; - vfio_group_unuse_container(device->group); + if (device->group->container) + vfio_group_unuse_container(device->group); err_module_put: mutex_unlock(&device->group->group_lock); module_put(device->dev->driver->owner); @@ -780,11 +823,13 @@ static void vfio_device_last_close(struct vfio_device *device) lockdep_assert_held(&device->dev_set->lock); mutex_lock(&device->group->group_lock); - vfio_device_container_unregister(device); + if (device->group->container) + vfio_device_container_unregister(device); if (device->ops->close_device) device->ops->close_device(device); device->kvm = NULL; - vfio_group_unuse_container(device->group); + if (device->group->container) + vfio_group_unuse_container(device->group); mutex_unlock(&device->group->group_lock); module_put(device->dev->driver->owner); } @@ -900,7 +945,14 @@ static int vfio_group_ioctl_get_status(struct vfio_group *group, return -ENODEV; } - if (group->container) + /* + * With the container FD the iommu_group_claim_dma_owner() is done + * during SET_CONTAINER but for IOMMFD this is done during + * VFIO_GROUP_GET_DEVICE_FD. Meaning that with iommufd + * VFIO_GROUP_FLAGS_VIABLE could be set but GET_DEVICE_FD will fail due + * to viability. + */ + if (group->container || group->iommufd) status.flags |= VFIO_GROUP_FLAGS_CONTAINER_SET | VFIO_GROUP_FLAGS_VIABLE; else if (!iommu_group_dma_owner_claimed(group->iommu_group)) @@ -983,6 +1035,10 @@ static int vfio_group_fops_release(struct inode *inode, struct file *filep) WARN_ON(group->notifier.head); if (group->container) vfio_group_detach_container(group); + if (group->iommufd) { + iommufd_ctx_put(group->iommufd); + group->iommufd = NULL; + } group->opened_file = NULL; mutex_unlock(&group->group_lock); return 0; @@ -1881,6 +1937,8 @@ static void __exit vfio_cleanup(void) module_init(vfio_init); module_exit(vfio_cleanup); +MODULE_IMPORT_NS(IOMMUFD); +MODULE_IMPORT_NS(IOMMUFD_VFIO); MODULE_VERSION(DRIVER_VERSION); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR(DRIVER_AUTHOR);