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Thu, 27 Jul 2023 13:24:50 -0700 Received: from rnnvmail202.nvidia.com (10.129.68.7) by rnnvmail203.nvidia.com (10.129.68.9) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.986.37; Thu, 27 Jul 2023 13:24:50 -0700 Received: from Asurada-Nvidia.nvidia.com (10.127.8.13) by mail.nvidia.com (10.129.68.7) with Microsoft SMTP Server id 15.2.986.37 via Frontend Transport; Thu, 27 Jul 2023 13:24:49 -0700 From: Nicolin Chen To: , CC: , , , , , , , , , , , Subject: [PATCH v10 2/6] iommufd: Allow passing in iopt_access_list_id to iopt_remove_access() Date: Thu, 27 Jul 2023 13:24:33 -0700 Message-ID: <9cf230e73d40b1458dcbb116d1fcfe8c62058bfe.1690488745.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: References: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT037:EE_|CH3PR12MB8354:EE_ X-MS-Office365-Filtering-Correlation-Id: fb4fe828-79e2-4e2b-f76d-08db8edf914f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jul 2023 20:25:06.8439 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: fb4fe828-79e2-4e2b-f76d-08db8edf914f X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.160]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT037.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB8354 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org This is a preparatory change for ioas replacement support for access. The replacement routine does an iopt_add_access() at a new IOAS first and then iopt_remove_access() at the old IOAS upon the success of the first call. However, the first call overrides the iopt_access_list_id in the access struct, resulting in that id un-erased in the xarray. Add an iopt_access_list_id in iopt_remove_access, so the replacement routine can save the id before it gets overwritten, and pass the id in iopt_remove_access() for a proper cleanup. The existing callers should just pass in access->iopt_access_list_id. Suggested-by: Jason Gunthorpe Reviewed-by: Jason Gunthorpe Signed-off-by: Nicolin Chen --- drivers/iommu/iommufd/device.c | 6 ++++-- drivers/iommu/iommufd/io_pagetable.c | 6 +++--- drivers/iommu/iommufd/iommufd_private.h | 3 ++- 3 files changed, 9 insertions(+), 6 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 57c0e81f5073..7a3e8660b902 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -690,7 +690,8 @@ void iommufd_access_destroy_object(struct iommufd_object *obj) container_of(obj, struct iommufd_access, obj); if (access->ioas) { - iopt_remove_access(&access->ioas->iopt, access); + iopt_remove_access(&access->ioas->iopt, access, + access->iopt_access_list_id); refcount_dec(&access->ioas->obj.users); access->ioas = NULL; } @@ -776,7 +777,8 @@ void iommufd_access_detach(struct iommufd_access *access) access->ops->unmap(access->data, 0, ULONG_MAX); mutex_lock(&access->ioas_lock); } - iopt_remove_access(&cur_ioas->iopt, access); + iopt_remove_access(&cur_ioas->iopt, access, + access->iopt_access_list_id); refcount_dec(&cur_ioas->obj.users); out: access->ioas_unpin = NULL; diff --git a/drivers/iommu/iommufd/io_pagetable.c b/drivers/iommu/iommufd/io_pagetable.c index 4d095115c2d0..3a598182b761 100644 --- a/drivers/iommu/iommufd/io_pagetable.c +++ b/drivers/iommu/iommufd/io_pagetable.c @@ -1158,12 +1158,12 @@ int iopt_add_access(struct io_pagetable *iopt, struct iommufd_access *access) } void iopt_remove_access(struct io_pagetable *iopt, - struct iommufd_access *access) + struct iommufd_access *access, + u32 iopt_access_list_id) { down_write(&iopt->domains_rwsem); down_write(&iopt->iova_rwsem); - WARN_ON(xa_erase(&iopt->access_list, access->iopt_access_list_id) != - access); + WARN_ON(xa_erase(&iopt->access_list, iopt_access_list_id) != access); WARN_ON(iopt_calculate_iova_alignment(iopt)); up_write(&iopt->iova_rwsem); up_write(&iopt->domains_rwsem); diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h index dba730129b8c..8ba786bc95ff 100644 --- a/drivers/iommu/iommufd/iommufd_private.h +++ b/drivers/iommu/iommufd/iommufd_private.h @@ -323,7 +323,8 @@ struct iommufd_access { int iopt_add_access(struct io_pagetable *iopt, struct iommufd_access *access); void iopt_remove_access(struct io_pagetable *iopt, - struct iommufd_access *access); + struct iommufd_access *access, + u32 iopt_access_list_id); void iommufd_access_destroy_object(struct iommufd_object *obj); #ifdef CONFIG_IOMMUFD_TEST From patchwork Thu Jul 27 20:24:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 707277 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 EEE59C41513 for ; Thu, 27 Jul 2023 20:25:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229866AbjG0UZO (ORCPT ); Thu, 27 Jul 2023 16:25:14 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231601AbjG0UZM (ORCPT ); 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DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jul 2023 20:25:07.4765 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b804c77b-0b56-4574-e2e7-08db8edf91b2 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: CO1NAM11FT019.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS7PR12MB6023 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The complication of the mutex and refcount will be amplified after we introduce the replace support for access. So, add a preparatory change of a constitutive helper iommufd_access_change_ioas() and its wrapper iommufd_access_change_ioas_id(). They can simply take care of existing iommufd_access_attach() and iommufd_access_detach(), with a less risk of race condition. Also, update the unprotect routine in iommufd_access_destroy_object() to calling the new iommufd_access_change_ioas() helper. Suggested-by: Jason Gunthorpe Signed-off-by: Nicolin Chen Reviewed-by: Kevin Tian --- drivers/iommu/iommufd/device.c | 123 +++++++++++++++++++++------------ 1 file changed, 80 insertions(+), 43 deletions(-) diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c index 7a3e8660b902..e79cbedd8626 100644 --- a/drivers/iommu/iommufd/device.c +++ b/drivers/iommu/iommufd/device.c @@ -684,17 +684,82 @@ void iommufd_device_detach(struct iommufd_device *idev) } EXPORT_SYMBOL_NS_GPL(iommufd_device_detach, IOMMUFD); +/* + * On success, it will refcount_inc() at a valid new_ioas and refcount_dec() at + * a valid cur_ioas (access->ioas). A caller passing in a valid new_ioas should + * call iommufd_put_object() if it does an iommufd_get_object() for a new_ioas. + */ +static int iommufd_access_change_ioas(struct iommufd_access *access, + struct iommufd_ioas *new_ioas) +{ + u32 iopt_access_list_id = access->iopt_access_list_id; + struct iommufd_ioas *cur_ioas = access->ioas; + int rc; + + lockdep_assert_held(&access->ioas_lock); + + /* We are racing with a concurrent detach, bail */ + if (cur_ioas != access->ioas_unpin) + return -EBUSY; + + if (IS_ERR(new_ioas)) + return PTR_ERR(new_ioas); + + if (cur_ioas == new_ioas) + return 0; + + /* + * 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 (new_ioas) { + rc = iopt_add_access(&new_ioas->iopt, access); + if (rc) { + access->ioas = cur_ioas; + return rc; + } + refcount_inc(&new_ioas->obj.users); + } + + if (cur_ioas) { + if (access->ops->unmap) { + 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, iopt_access_list_id); + refcount_dec(&cur_ioas->obj.users); + } + + access->ioas = new_ioas; + access->ioas_unpin = new_ioas; + + return 0; +} + +static int iommufd_access_change_ioas_id(struct iommufd_access *access, u32 id) +{ + struct iommufd_ioas *ioas = iommufd_get_ioas(access->ictx, id); + int rc; + + if (IS_ERR(ioas)) + return PTR_ERR(ioas); + rc = iommufd_access_change_ioas(access, ioas); + iommufd_put_object(&ioas->obj); + return rc; +} + void iommufd_access_destroy_object(struct iommufd_object *obj) { struct iommufd_access *access = container_of(obj, struct iommufd_access, obj); - if (access->ioas) { - iopt_remove_access(&access->ioas->iopt, access, - access->iopt_access_list_id); - refcount_dec(&access->ioas->obj.users); - access->ioas = NULL; - } + mutex_lock(&access->ioas_lock); + if (access->ioas) + WARN_ON(iommufd_access_change_ioas(access, NULL)); + mutex_unlock(&access->ioas_lock); iommufd_ctx_put(access->ictx); } @@ -761,60 +826,32 @@ EXPORT_SYMBOL_NS_GPL(iommufd_access_destroy, IOMMUFD); void iommufd_access_detach(struct iommufd_access *access) { - struct iommufd_ioas *cur_ioas = access->ioas; + int rc; mutex_lock(&access->ioas_lock); - if (WARN_ON(!access->ioas)) - goto out; - /* - * 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 (access->ops->unmap) { + if (WARN_ON(!access->ioas)) { mutex_unlock(&access->ioas_lock); - access->ops->unmap(access->data, 0, ULONG_MAX); - mutex_lock(&access->ioas_lock); + return; } - iopt_remove_access(&cur_ioas->iopt, access, - access->iopt_access_list_id); - refcount_dec(&cur_ioas->obj.users); -out: - access->ioas_unpin = NULL; + rc = iommufd_access_change_ioas(access, NULL); + WARN_ON(rc); mutex_unlock(&access->ioas_lock); } EXPORT_SYMBOL_NS_GPL(iommufd_access_detach, IOMMUFD); int iommufd_access_attach(struct iommufd_access *access, u32 ioas_id) { - struct iommufd_ioas *new_ioas; - int rc = 0; + int rc; mutex_lock(&access->ioas_lock); - if (WARN_ON(access->ioas || access->ioas_unpin)) { + if (WARN_ON(access->ioas)) { mutex_unlock(&access->ioas_lock); return -EINVAL; } - new_ioas = iommufd_get_ioas(access->ictx, ioas_id); - if (IS_ERR(new_ioas)) { - mutex_unlock(&access->ioas_lock); - return PTR_ERR(new_ioas); - } - - rc = iopt_add_access(&new_ioas->iopt, access); - if (rc) { - mutex_unlock(&access->ioas_lock); - iommufd_put_object(&new_ioas->obj); - return rc; - } - iommufd_ref_to_users(&new_ioas->obj); - - access->ioas = new_ioas; - access->ioas_unpin = new_ioas; + rc = iommufd_access_change_ioas_id(access, ioas_id); mutex_unlock(&access->ioas_lock); - return 0; + return rc; } EXPORT_SYMBOL_NS_GPL(iommufd_access_attach, IOMMUFD); From patchwork Thu Jul 27 20:24:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolin Chen X-Patchwork-Id: 707276 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 38210C0015E for ; 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Thu, 27 Jul 2023 13:24:53 -0700 From: Nicolin Chen To: , CC: , , , , , , , , , , , Subject: [PATCH v10 6/6] vfio: Support IO page table replacement Date: Thu, 27 Jul 2023 13:24:37 -0700 Message-ID: <12b9718d0225701b37aad75395187ef667464bc0.1690488745.git.nicolinc@nvidia.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: References: MIME-Version: 1.0 X-NV-OnPremToCloud: ExternallySecured X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM6NAM11FT099:EE_|BY5PR12MB4950:EE_ X-MS-Office365-Filtering-Correlation-Id: 40c6c4ce-7dc4-4122-afb9-08db8edf93ad 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:216.228.117.160; CTRY:US; LANG:en; SCL:1; SRV:; IPV:NLI; SFV:NSPM; H:mail.nvidia.com; PTR:dc6edge1.nvidia.com; CAT:NONE; SFS:(13230028)(4636009)(376002)(39860400002)(136003)(396003)(346002)(451199021)(82310400008)(40470700004)(36840700001)(46966006)(47076005)(478600001)(110136005)(54906003)(86362001)(70586007)(4326008)(316002)(70206006)(356005)(7636003)(40480700001)(186003)(6666004)(82740400003)(8676002)(26005)(336012)(40460700003)(7696005)(8936002)(7416002)(2906002)(426003)(41300700001)(5660300002)(2616005)(36756003)(83380400001)(36860700001); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Jul 2023 20:25:10.8135 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 40c6c4ce-7dc4-4122-afb9-08db8edf93ad X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a; Ip=[216.228.117.160]; Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: DM6NAM11FT099.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BY5PR12MB4950 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Now both the physical path and the emulated path should support an IO page table replacement. Call iommufd_device_replace/iommufd_access_replace(), when vdev->iommufd_attached is true. Also update the VFIO_DEVICE_ATTACH_IOMMUFD_PT kdoc in the uAPI header. Reviewed-by: Kevin Tian Reviewed-by: Jason Gunthorpe Reviewed-by: Alex Williamson Signed-off-by: Nicolin Chen --- drivers/vfio/iommufd.c | 11 ++++++----- include/uapi/linux/vfio.h | 6 ++++++ 2 files changed, 12 insertions(+), 5 deletions(-) diff --git a/drivers/vfio/iommufd.c b/drivers/vfio/iommufd.c index 4d84904fd927..82eba6966fa5 100644 --- a/drivers/vfio/iommufd.c +++ b/drivers/vfio/iommufd.c @@ -146,9 +146,9 @@ int vfio_iommufd_physical_attach_ioas(struct vfio_device *vdev, u32 *pt_id) return -EINVAL; if (vdev->iommufd_attached) - return -EBUSY; - - rc = iommufd_device_attach(vdev->iommufd_device, pt_id); + rc = iommufd_device_replace(vdev->iommufd_device, pt_id); + else + rc = iommufd_device_attach(vdev->iommufd_device, pt_id); if (rc) return rc; vdev->iommufd_attached = true; @@ -223,8 +223,9 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id) lockdep_assert_held(&vdev->dev_set->lock); if (vdev->iommufd_attached) - return -EBUSY; - rc = iommufd_access_attach(vdev->iommufd_access, *pt_id); + rc = iommufd_access_replace(vdev->iommufd_access, *pt_id); + else + rc = iommufd_access_attach(vdev->iommufd_access, *pt_id); if (rc) return rc; vdev->iommufd_attached = true; diff --git a/include/uapi/linux/vfio.h b/include/uapi/linux/vfio.h index fa06e3eb4955..537157ff8670 100644 --- a/include/uapi/linux/vfio.h +++ b/include/uapi/linux/vfio.h @@ -939,6 +939,12 @@ struct vfio_device_bind_iommufd { * Undo by VFIO_DEVICE_DETACH_IOMMUFD_PT or device fd close. This is only * allowed on cdev fds. * + * If a vfio device is currently attached to a valid hw_pagetable, without doing + * a VFIO_DEVICE_DETACH_IOMMUFD_PT, a second VFIO_DEVICE_ATTACH_IOMMUFD_PT ioctl + * passing in another hw_pagetable (hwpt) id is allowed. This action, also known + * as a hw_pagetable replacement, will replace the device's currently attached + * hw_pagetable with a new hw_pagetable corresponding to the given pt_id. + * * Return: 0 on success, -errno on failure. */ struct vfio_device_attach_iommufd_pt {