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DIR:OUT; SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 18 Sep 2023 04:50:06.3371 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 4652660a-82b0-467f-1d03-08dbb802bab5 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: DS3PEPF000099D8.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN2PR12MB4270 Received-SPF: softfail client-ip=40.107.244.47; envelope-from=yajunw@nvidia.com; helo=NAM12-MW2-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, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, 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+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Add New API vhost_dev_start_presetup to notify backend the start and end of presetup. API vhost_dev_presetup to send out the device configurations: 1. acked_features 2. memory table 3. vring information 4. disable host/guest notifier. Signed-off-by: Yajun Wu Reviewed-by: Avihai Horon Reviewed-by: Jiri Pirko --- hw/virtio/vhost.c | 166 ++++++++++++++++++++++++++++++++------ include/hw/virtio/vhost.h | 12 +++ 2 files changed, 152 insertions(+), 26 deletions(-) diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c index e2f6ffb446..5b162590fb 100644 --- a/hw/virtio/vhost.c +++ b/hw/virtio/vhost.c @@ -1138,24 +1138,71 @@ out: return ret; } -int vhost_virtqueue_start(struct vhost_dev *dev, - struct VirtIODevice *vdev, - struct vhost_virtqueue *vq, - unsigned idx) +static void vhost_virtqueue_memory_unmap(struct vhost_dev *dev, + struct VirtIODevice *vdev, + struct vhost_virtqueue *vq, + unsigned idx) +{ + if (vq->used) { + vhost_memory_unmap(dev, vq->used, + virtio_queue_get_used_size(vdev, idx), + 1, virtio_queue_get_used_size(vdev, idx)); + vq->used = NULL; + } + + if (vq->avail) { + vhost_memory_unmap(dev, vq->avail, + virtio_queue_get_avail_size(vdev, idx), + 0, virtio_queue_get_avail_size(vdev, idx)); + vq->avail = NULL; + } + + if (vq->desc) { + vhost_memory_unmap(dev, vq->desc, + virtio_queue_get_desc_size(vdev, idx), + 0, virtio_queue_get_desc_size(vdev, idx)); + vq->desc = NULL; + } +} + +static int vhost_virtqueue_disable_notify(struct vhost_dev *dev, + struct VirtIODevice *vdev, + struct vhost_virtqueue *vq, + unsigned idx) { - BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); - VirtioBusState *vbus = VIRTIO_BUS(qbus); - VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); - hwaddr s, l, a; - int r; int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); struct vhost_vring_file file = { .index = vhost_vq_index }; + int r; + + file.fd = -1; + r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); + if (r) { + VHOST_OPS_DEBUG(r, "vhost_set_vring_kick failed"); + return r; + } + + r = dev->vhost_ops->vhost_set_vring_call(dev, &file); + if (r) { + VHOST_OPS_DEBUG(r, "vhost_set_vring_call failed"); + return r; + } + + return 0; +} + +static int vhost_virtqueue_vring_setup(struct vhost_dev *dev, + struct VirtIODevice *vdev, + struct vhost_virtqueue *vq, + unsigned idx) +{ + hwaddr s, l, a; + int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); struct vhost_vring_state state = { .index = vhost_vq_index }; - struct VirtQueue *vvq = virtio_get_queue(vdev, idx); + int r; a = virtio_queue_get_desc_addr(vdev, idx); if (a == 0) { @@ -1186,6 +1233,10 @@ int vhost_virtqueue_start(struct vhost_dev *dev, } } + if (vq->desc) { + vhost_virtqueue_memory_unmap(dev, vdev, vq, idx); + } + vq->desc_size = s = l = virtio_queue_get_desc_size(vdev, idx); vq->desc_phys = a; vq->desc = vhost_memory_map(dev, a, &l, false); @@ -1212,6 +1263,36 @@ int vhost_virtqueue_start(struct vhost_dev *dev, if (r < 0) { goto fail_alloc; } + return 0; + +fail_alloc: +fail_alloc_used: +fail_alloc_avail: + vhost_virtqueue_memory_unmap(dev, vdev, vq, idx); +fail_alloc_desc: + return r; +} + +int vhost_virtqueue_start(struct vhost_dev *dev, + struct VirtIODevice *vdev, + struct vhost_virtqueue *vq, + unsigned idx) +{ + BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); + VirtioBusState *vbus = VIRTIO_BUS(qbus); + VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(vbus); + int r; + int vhost_vq_index = dev->vhost_ops->vhost_get_vq_index(dev, idx); + struct vhost_vring_file file = { + .index = vhost_vq_index + }; + struct VirtQueue *vvq = virtio_get_queue(vdev, idx); + + r = vhost_virtqueue_vring_setup(dev, vdev, vq, idx); + if (r) { + VHOST_OPS_DEBUG(r, "vhost_virtqueue_vring_setup failed"); + goto fail_vring_setup; + } file.fd = event_notifier_get_fd(virtio_queue_get_host_notifier(vvq)); r = dev->vhost_ops->vhost_set_vring_kick(dev, &file); @@ -1245,16 +1326,8 @@ int vhost_virtqueue_start(struct vhost_dev *dev, fail_vector: fail_kick: -fail_alloc: - vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), - 0, 0); -fail_alloc_used: - vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), - 0, 0); -fail_alloc_avail: - vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), - 0, 0); -fail_alloc_desc: + vhost_virtqueue_memory_unmap(dev, vdev, vq, idx); +fail_vring_setup: return r; } @@ -1296,12 +1369,7 @@ void vhost_virtqueue_stop(struct vhost_dev *dev, vhost_vq_index); } - vhost_memory_unmap(dev, vq->used, virtio_queue_get_used_size(vdev, idx), - 1, virtio_queue_get_used_size(vdev, idx)); - vhost_memory_unmap(dev, vq->avail, virtio_queue_get_avail_size(vdev, idx), - 0, virtio_queue_get_avail_size(vdev, idx)); - vhost_memory_unmap(dev, vq->desc, virtio_queue_get_desc_size(vdev, idx), - 0, virtio_queue_get_desc_size(vdev, idx)); + vhost_virtqueue_memory_unmap(dev, vdev, vq, idx); } static int vhost_virtqueue_set_busyloop_timeout(struct vhost_dev *dev, @@ -1921,6 +1989,43 @@ static int vhost_dev_set_vring_enable(struct vhost_dev *hdev, int enable) return hdev->vhost_ops->vhost_set_vring_enable(hdev, enable); } +int vhost_dev_presetup(struct vhost_dev *hdev, VirtIODevice *vdev) +{ + int i, r; + + /* should only be called after backend is connected */ + assert(hdev->vhost_ops); + + r = vhost_dev_set_features(hdev, hdev->log_enabled); + if (r < 0) { + return r; + } + + r = hdev->vhost_ops->vhost_set_mem_table(hdev, hdev->mem); + if (r < 0) { + VHOST_OPS_DEBUG(r, "vhost_set_mem_table failed"); + return r; + } + + for (i = 0; i < hdev->nvqs; ++i) { + r = vhost_virtqueue_vring_setup(hdev, vdev, + hdev->vqs + i, + hdev->vq_index + i); + if (r < 0) { + VHOST_OPS_DEBUG(r, "vhost_virtqueue_setup failed"); + return r; + } + r = vhost_virtqueue_disable_notify(hdev, vdev, + hdev->vqs + i, + hdev->vq_index + i); + if (r < 0) { + return r; + } + } + + return 0; +} + /* Host notifiers must be enabled at this point. */ int vhost_dev_start(struct vhost_dev *hdev, VirtIODevice *vdev, bool vrings) { @@ -2087,3 +2192,12 @@ int vhost_net_set_backend(struct vhost_dev *hdev, return -ENOSYS; } + +int vhost_dev_set_presetup_state(struct vhost_dev *hdev, bool start) +{ + if (!hdev->vhost_ops->vhost_presetup) { + return -ENOTSUP; + } + + return hdev->vhost_ops->vhost_presetup(hdev, start); +} diff --git a/include/hw/virtio/vhost.h b/include/hw/virtio/vhost.h index 6a173cb9fa..95a8031d12 100644 --- a/include/hw/virtio/vhost.h +++ b/include/hw/virtio/vhost.h @@ -192,6 +192,17 @@ void vhost_dev_disable_notifiers(struct vhost_dev *hdev, VirtIODevice *vdev); bool vhost_config_pending(struct vhost_dev *hdev); void vhost_config_mask(struct vhost_dev *hdev, VirtIODevice *vdev, bool mask); +/** + * vhost_dev_presetup() - pre-setup the vhost device in LM + * @hdev: common vhost_dev structure + * @vdev: the VirtIODevice structure + * + * During live migration, send out device information to backend in early + * running state. Backend can have enough time to prepare HW. + * Return: 0 on success, < 0 on error. + */ +int vhost_dev_presetup(struct vhost_dev *hdev, VirtIODevice *vdev); + /** * vhost_dev_is_started() - report status of vhost device * @hdev: common vhost_dev structure @@ -338,4 +349,5 @@ int vhost_dev_set_inflight(struct vhost_dev *dev, int vhost_dev_get_inflight(struct vhost_dev *dev, uint16_t queue_size, struct vhost_inflight *inflight); bool vhost_dev_has_iommu(struct vhost_dev *dev); +int vhost_dev_set_presetup_state(struct vhost_dev *hdev, bool start); #endif