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Wed, 22 Feb 2023 09:50:20 -0800 From: Avihai Horon To: CC: Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_G?= =?utf-8?q?oater?= , Juan Quintela , "Dr. David Alan Gilbert" , "Michael S. Tsirkin" , Peter Xu , "Jason Wang" , Marcel Apfelbaum , Paolo Bonzini , Richard Henderson , Eduardo Habkost , "David Hildenbrand" , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= , Yishai Hadas , Jason Gunthorpe , Maor Gottlieb , Avihai Horon , Kirti Wankhede , Tarun Gupta , Joao Martins Subject: [PATCH v2 11/20] vfio/common: Add device dirty page tracking start/stop Date: Wed, 22 Feb 2023 19:49:06 +0200 Message-ID: <20230222174915.5647-12-avihaih@nvidia.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20230222174915.5647-1-avihaih@nvidia.com> References: <20230222174915.5647-1-avihaih@nvidia.com> MIME-Version: 1.0 X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL02EPF0000C403:EE_|DM4PR12MB8521:EE_ X-MS-Office365-Filtering-Correlation-Id: 841fada8-49cd-4c93-609d-08db14fd4efa 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)(346002)(396003)(136003)(376002)(39860400002)(451199018)(46966006)(40470700004)(36840700001)(7696005)(82310400005)(26005)(336012)(186003)(36756003)(6916009)(478600001)(2616005)(426003)(86362001)(70206006)(83380400001)(70586007)(8676002)(1076003)(6666004)(47076005)(54906003)(316002)(4326008)(41300700001)(7416002)(8936002)(36860700001)(5660300002)(82740400003)(40480700001)(2906002)(7636003)(356005)(40460700003)(14143004); DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Feb 2023 17:50:38.5182 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 841fada8-49cd-4c93-609d-08db14fd4efa 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: BL02EPF0000C403.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB8521 Received-SPF: softfail client-ip=2a01:111:f400:7e83::612; envelope-from=avihaih@nvidia.com; helo=NAM02-DM3-obe.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org From: Joao Martins Add device dirty page tracking start/stop functionality. This uses the device DMA logging uAPI to start and stop dirty page tracking by device. Device dirty page tracking is used only if all devices within a container support device dirty page tracking. Signed-off-by: Joao Martins Signed-off-by: Avihai Horon --- include/hw/vfio/vfio-common.h | 2 + hw/vfio/common.c | 211 +++++++++++++++++++++++++++++++++- 2 files changed, 211 insertions(+), 2 deletions(-) diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h index 6f36876ce0..1f21e1fa43 100644 --- a/include/hw/vfio/vfio-common.h +++ b/include/hw/vfio/vfio-common.h @@ -149,6 +149,8 @@ typedef struct VFIODevice { VFIOMigration *migration; Error *migration_blocker; OnOffAuto pre_copy_dirty_page_tracking; + bool dirty_pages_supported; + bool dirty_tracking; } VFIODevice; struct VFIODeviceOps { diff --git a/hw/vfio/common.c b/hw/vfio/common.c index 6041da6c7e..740153e7d7 100644 --- a/hw/vfio/common.c +++ b/hw/vfio/common.c @@ -473,6 +473,22 @@ static bool vfio_devices_all_dirty_tracking(VFIOContainer *container) return true; } +static bool vfio_devices_all_device_dirty_tracking(VFIOContainer *container) +{ + VFIOGroup *group; + VFIODevice *vbasedev; + + QLIST_FOREACH(group, &container->group_list, container_next) { + QLIST_FOREACH(vbasedev, &group->device_list, next) { + if (!vbasedev->dirty_pages_supported) { + return false; + } + } + } + + return true; +} + /* * Check if all VFIO devices are running and migration is active, which is * essentially equivalent to the migration being in pre-copy phase. @@ -1404,13 +1420,192 @@ static int vfio_set_dirty_page_tracking(VFIOContainer *container, bool start) return ret; } +static int vfio_devices_dma_logging_set(VFIOContainer *container, + struct vfio_device_feature *feature) +{ + bool status = (feature->flags & VFIO_DEVICE_FEATURE_MASK) == + VFIO_DEVICE_FEATURE_DMA_LOGGING_START; + VFIODevice *vbasedev; + VFIOGroup *group; + int ret = 0; + + QLIST_FOREACH(group, &container->group_list, container_next) { + QLIST_FOREACH(vbasedev, &group->device_list, next) { + if (vbasedev->dirty_tracking == status) { + continue; + } + + ret = ioctl(vbasedev->fd, VFIO_DEVICE_FEATURE, feature); + if (ret) { + ret = -errno; + error_report("%s: Failed to set DMA logging %s, err %d (%s)", + vbasedev->name, status ? "start" : "stop", ret, + strerror(errno)); + goto out; + } + vbasedev->dirty_tracking = status; + } + } + +out: + return ret; +} + +static int vfio_devices_dma_logging_stop(VFIOContainer *container) +{ + uint64_t buf[DIV_ROUND_UP(sizeof(struct vfio_device_feature), + sizeof(uint64_t))] = {}; + struct vfio_device_feature *feature = (struct vfio_device_feature *)buf; + + feature->argsz = sizeof(buf); + feature->flags = VFIO_DEVICE_FEATURE_SET; + feature->flags |= VFIO_DEVICE_FEATURE_DMA_LOGGING_STOP; + + return vfio_devices_dma_logging_set(container, feature); +} + +static gboolean vfio_device_dma_logging_range_add(DMAMap *map, gpointer data) +{ + struct vfio_device_feature_dma_logging_range **out = data; + struct vfio_device_feature_dma_logging_range *range = *out; + + range->iova = map->iova; + /* IOVATree is inclusive, DMA logging uAPI isn't, so add 1 to length */ + range->length = map->size + 1; + + *out = ++range; + + return false; +} + +static gboolean vfio_iova_tree_get_first(DMAMap *map, gpointer data) +{ + DMAMap *first = data; + + first->iova = map->iova; + first->size = map->size; + + return true; +} + +static gboolean vfio_iova_tree_get_last(DMAMap *map, gpointer data) +{ + DMAMap *last = data; + + last->iova = map->iova; + last->size = map->size; + + return false; +} + +static struct vfio_device_feature * +vfio_device_feature_dma_logging_start_create(VFIOContainer *container) +{ + struct vfio_device_feature *feature; + size_t feature_size; + struct vfio_device_feature_dma_logging_control *control; + struct vfio_device_feature_dma_logging_range *ranges; + unsigned int max_ranges; + unsigned int cur_ranges; + + feature_size = sizeof(struct vfio_device_feature) + + sizeof(struct vfio_device_feature_dma_logging_control); + feature = g_malloc0(feature_size); + feature->argsz = feature_size; + feature->flags = VFIO_DEVICE_FEATURE_SET; + feature->flags |= VFIO_DEVICE_FEATURE_DMA_LOGGING_START; + + control = (struct vfio_device_feature_dma_logging_control *)feature->data; + control->page_size = qemu_real_host_page_size(); + + QEMU_LOCK_GUARD(&container->mappings_mutex); + + /* + * DMA logging uAPI guarantees to support at least num_ranges that fits into + * a single host kernel page. To be on the safe side, use this as a limit + * from which to merge to a single range. + */ + max_ranges = qemu_real_host_page_size() / sizeof(*ranges); + cur_ranges = iova_tree_nnodes(container->mappings); + control->num_ranges = (cur_ranges <= max_ranges) ? cur_ranges : 1; + ranges = g_try_new0(struct vfio_device_feature_dma_logging_range, + control->num_ranges); + if (!ranges) { + g_free(feature); + errno = ENOMEM; + + return NULL; + } + + control->ranges = (uint64_t)ranges; + if (cur_ranges <= max_ranges) { + iova_tree_foreach(container->mappings, + vfio_device_dma_logging_range_add, &ranges); + } else { + DMAMap first, last; + + iova_tree_foreach(container->mappings, vfio_iova_tree_get_first, + &first); + iova_tree_foreach(container->mappings, vfio_iova_tree_get_last, &last); + ranges->iova = first.iova; + /* IOVATree is inclusive, DMA logging uAPI isn't, so add 1 to length */ + ranges->length = (last.iova - first.iova) + last.size + 1; + } + + return feature; +} + +static void vfio_device_feature_dma_logging_start_destroy( + struct vfio_device_feature *feature) +{ + struct vfio_device_feature_dma_logging_control *control = + (struct vfio_device_feature_dma_logging_control *)feature->data; + struct vfio_device_feature_dma_logging_range *ranges = + (struct vfio_device_feature_dma_logging_range *)control->ranges; + + g_free(ranges); + g_free(feature); +} + +static int vfio_devices_dma_logging_start(VFIOContainer *container) +{ + struct vfio_device_feature *feature; + int ret; + + feature = vfio_device_feature_dma_logging_start_create(container); + if (!feature) { + return -errno; + } + + ret = vfio_devices_dma_logging_set(container, feature); + if (ret) { + vfio_devices_dma_logging_stop(container); + } + + vfio_device_feature_dma_logging_start_destroy(feature); + + return ret; +} + static void vfio_listener_log_global_start(MemoryListener *listener) { VFIOContainer *container = container_of(listener, VFIOContainer, listener); int ret; - ret = vfio_set_dirty_page_tracking(container, true); + if (vfio_devices_all_device_dirty_tracking(container)) { + if (vfio_have_giommu(container)) { + /* Device dirty page tracking currently doesn't support vIOMMU */ + return; + } + + ret = vfio_devices_dma_logging_start(container); + } else { + ret = vfio_set_dirty_page_tracking(container, true); + } + if (ret) { + error_report("vfio: Could not start dirty page tracking, err: %d (%s)", + ret, strerror(-ret)); vfio_set_migration_error(ret); } } @@ -1420,8 +1615,20 @@ static void vfio_listener_log_global_stop(MemoryListener *listener) VFIOContainer *container = container_of(listener, VFIOContainer, listener); int ret; - ret = vfio_set_dirty_page_tracking(container, false); + if (vfio_devices_all_device_dirty_tracking(container)) { + if (vfio_have_giommu(container)) { + /* Device dirty page tracking currently doesn't support vIOMMU */ + return; + } + + ret = vfio_devices_dma_logging_stop(container); + } else { + ret = vfio_set_dirty_page_tracking(container, false); + } + if (ret) { + error_report("vfio: Could not stop dirty page tracking, err: %d (%s)", + ret, strerror(-ret)); vfio_set_migration_error(ret); } }