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Wed, 1 Feb 2023 23:05:27 -0800 Received: from rnnvmail203.nvidia.com (10.129.68.9) by rnnvmail205.nvidia.com (10.129.68.10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.36; Wed, 1 Feb 2023 23:05:27 -0800 Received: from Asurada-Nvidia.nvidia.com (10.127.8.11) by mail.nvidia.com (10.129.68.9) with Microsoft SMTP Server id 15.2.986.36 via Frontend Transport; Wed, 1 Feb 2023 23:05:26 -0800 From: Nicolin Chen To: , , , , , , CC: , , , , , Subject: [PATCH v1 5/8] iommufd: Add replace support in iommufd_access_set_ioas() Date: Wed, 1 Feb 2023 23:05:09 -0800 Message-ID: X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS1PEPF0000B077:EE_|DS7PR12MB8323:EE_ X-MS-Office365-Filtering-Correlation-Id: e65e79a0-3fcd-4021-74c4-08db04ebe591 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:216.228.117.161;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:dc6edge2.nvidia.com;CAT:NONE;SFS:(13230025)(4636009)(376002)(39860400002)(136003)(396003)(346002)(451199018)(46966006)(36840700001)(40470700004)(40460700003)(2616005)(316002)(110136005)(83380400001)(4326008)(41300700001)(8936002)(54906003)(8676002)(70586007)(70206006)(6666004)(336012)(478600001)(26005)(186003)(426003)(7696005)(47076005)(86362001)(356005)(36756003)(40480700001)(2906002)(36860700001)(5660300002)(7416002)(7636003)(82310400005)(82740400003)(309714004);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Feb 2023 07:05:41.6835 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: e65e79a0-3fcd-4021-74c4-08db04ebe591 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DS1PEPF0000B077.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB8323 X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FORGED_SPF_HELO, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1756702109194124500?= X-GMAIL-MSGID: =?utf-8?q?1756702109194124500?= Support an access->ioas replacement in iommufd_access_set_ioas(), which sets the access->ioas to NULL provisionally so that any further incoming iommufd_access_pin_pages() callback can be blocked. Then, call access->ops->unmap() to clean up the entire iopt. To allow an iommufd_access_unpin_pages() callback to happen via this unmap() call, add an ioas_unpin pointer so the unpin routine won't be affected by the "access->ioas = NULL" trick above. Also, a vdev without an ops->dma_unmap implementation cannot replace its access->ioas pointer. So add an iommufd_access_ioas_is_attached() helper to sanity that. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/device.c | 28 +++++++++++++++++++++++-- drivers/iommu/iommufd/iommufd_private.h | 1 + drivers/vfio/iommufd.c | 4 ++++ include/linux/iommufd.h | 1 + 4 files changed, 32 insertions(+), 2 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index f4bd6f532a90..8118d5262800 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -509,11 +509,23 @@ int iommufd_access_set_ioas(struct iommufd_access *access, u32 ioas_id) iommufd_ref_to_users(obj); } + /* + * Set ioas to NULL to block any further iommufd_access_pin_pages(). + * iommufd_access_unpin_pages() can continue using access->ioas_unpin. + */ + access->ioas = NULL; + if (cur_ioas) { + if (new_ioas) { + mutex_unlock(&access->ioas_lock); + access->ops->unmap(access->data, 0, ULONG_MAX); + mutex_lock(&access->ioas_lock); + } iopt_remove_access(&cur_ioas->iopt, access); refcount_dec(&cur_ioas->obj.users); } + access->ioas_unpin = new_ioas; access->ioas = new_ioas; mutex_unlock(&access->ioas_lock); @@ -527,6 +539,18 @@ int iommufd_access_set_ioas(struct iommufd_access *access, u32 ioas_id) } EXPORT_SYMBOL_NS_GPL(iommufd_access_set_ioas, IOMMUFD); +bool iommufd_access_ioas_is_attached(struct iommufd_access *access) +{ + bool attached; + + mutex_lock(&access->ioas_lock); + attached = !!access->ioas; + mutex_unlock(&access->ioas_lock); + + return attached; +} +EXPORT_SYMBOL_NS_GPL(iommufd_access_ioas_is_attached, IOMMUFD); + /** * iommufd_access_notify_unmap - Notify users of an iopt to stop using it * @iopt: iopt to work on @@ -587,11 +611,11 @@ void iommufd_access_unpin_pages(struct iommufd_access *access, return; mutex_lock(&access->ioas_lock); - if (!access->ioas) { + if (!access->ioas_unpin) { mutex_unlock(&access->ioas_lock); return; } - iopt = &access->ioas->iopt; + iopt = &access->ioas_unpin->iopt; down_read(&iopt->iova_rwsem); iopt_for_each_contig_area(&iter, area, iopt, iova, last_iova) diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index 2f4bb106bac6..593138bb37b8 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -261,6 +261,7 @@ struct iommufd_access { struct iommufd_object obj; struct iommufd_ctx *ictx; struct iommufd_ioas *ioas; + struct iommufd_ioas *ioas_unpin; struct mutex ioas_lock; const struct iommufd_access_ops *ops; void *data; diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c index 78a8e4641cbf..7e09defbcffe 100644 --- a/drivers/vfio/iommufd.c +++ b/drivers/vfio/iommufd.c @@ -187,6 +187,10 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id) if (!vdev->iommufd_access) return -ENOENT; + if (!vdev->ops->dma_unmap && pt_id && + iommufd_access_ioas_is_attached(vdev->iommufd_access)) + return -EBUSY; + iommufd_access_set_ioas(vdev->iommufd_access, *pt_id); return 0; } diff --git a/include/linux/iommufd.h b/include/linux/iommufd.h index 0e30f2ce27cd..e8d764b2c14c 100644 --- a/include/linux/iommufd.h +++ b/include/linux/iommufd.h @@ -44,6 +44,7 @@ iommufd_access_create(struct iommufd_ctx *ictx, const struct iommufd_access_ops *ops, void *data); void iommufd_access_destroy(struct iommufd_access *access); int iommufd_access_set_ioas(struct iommufd_access *access, u32 ioas_id); +bool iommufd_access_ioas_is_attached(struct iommufd_access *access); void iommufd_ctx_get(struct iommufd_ctx *ictx);