/* Context: QEMU global mutex held */ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf, VirtIOBlockDataPlane **dataplane, Error **errp) { VirtIOBlockDataPlane *s; BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); *dataplane = NULL; if (!conf->iothread) { return; } /* Don't try if transport does not support notifiers. */ if (!k->set_guest_notifiers || !k->set_host_notifier) { error_setg(errp, "device is incompatible with dataplane " "(transport does not support notifiers)"); return; } /* If dataplane is (re-)enabled while the guest is running there could be * block jobs that can conflict. */ if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { error_prepend(errp, "cannot start dataplane thread: "); return; } s = g_new0(VirtIOBlockDataPlane, 1); s->vdev = vdev; s->conf = conf; if (conf->iothread) { s->iothread = conf->iothread; object_ref(OBJECT(s->iothread)); } s->ctx = iothread_get_aio_context(s->iothread); s->bh = aio_bh_new(s->ctx, notify_guest_bh, s); error_setg(&s->blocker, "block device is in use by data plane"); blk_op_block_all(conf->conf.blk, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_BACKUP_SOURCE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_CHANGE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_SOURCE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_TARGET, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EJECT, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_MIRROR_SOURCE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_STREAM, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_REPLACE, s->blocker); *dataplane = s; }
/* Context: QEMU global mutex held */ void virtio_scsi_dataplane_start(VirtIOSCSI *s) { int i; int rc; BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); if (s->dataplane_started || s->dataplane_starting || s->dataplane_fenced || s->ctx != iothread_get_aio_context(vs->conf.iothread)) { return; } s->dataplane_starting = true; /* Set up guest notifier (irq) */ rc = k->set_guest_notifiers(qbus->parent, vs->conf.num_queues + 2, true); if (rc != 0) { fprintf(stderr, "virtio-scsi: Failed to set guest notifiers (%d), " "ensure -enable-kvm is set\n", rc); goto fail_guest_notifiers; } aio_context_acquire(s->ctx); rc = virtio_scsi_vring_init(s, vs->ctrl_vq, 0); if (rc) { goto fail_vrings; } rc = virtio_scsi_vring_init(s, vs->event_vq, 1); if (rc) { goto fail_vrings; } for (i = 0; i < vs->conf.num_queues; i++) { rc = virtio_scsi_vring_init(s, vs->cmd_vqs[i], i + 2); if (rc) { goto fail_vrings; } } s->dataplane_starting = false; s->dataplane_started = true; aio_context_release(s->ctx); return; fail_vrings: virtio_scsi_clear_aio(s); aio_context_release(s->ctx); for (i = 0; i < vs->conf.num_queues + 2; i++) { k->set_host_notifier(qbus->parent, i, false); } k->set_guest_notifiers(qbus->parent, vs->conf.num_queues + 2, false); fail_guest_notifiers: s->dataplane_fenced = true; s->dataplane_starting = false; s->dataplane_started = true; }
static void colo_compare_timer_init(CompareState *s) { AioContext *ctx = iothread_get_aio_context(s->iothread); s->packet_check_timer = aio_timer_new(ctx, QEMU_CLOCK_VIRTUAL, SCALE_MS, check_old_packet_regular, s); timer_mod(s->packet_check_timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + REGULAR_PACKET_CHECK_MS); }
/* Context: QEMU global mutex held */ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf, VirtIOBlockDataPlane **dataplane, Error **errp) { VirtIOBlockDataPlane *s; BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); *dataplane = NULL; if (!conf->iothread) { return; } /* Don't try if transport does not support notifiers. */ if (!k->set_guest_notifiers || !k->set_host_notifier) { error_setg(errp, "device is incompatible with dataplane " "(transport does not support notifiers)"); return; } /* If dataplane is (re-)enabled while the guest is running there could be * block jobs that can conflict. */ if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, errp)) { error_prepend(errp, "cannot start dataplane thread: "); return; } s = g_new0(VirtIOBlockDataPlane, 1); s->vdev = vdev; s->conf = conf; if (conf->iothread) { s->iothread = conf->iothread; object_ref(OBJECT(s->iothread)); } s->ctx = iothread_get_aio_context(s->iothread); s->bh = aio_bh_new(s->ctx, notify_guest_bh, s); s->insert_notifier.notify = data_plane_blk_insert_notifier; s->remove_notifier.notify = data_plane_blk_remove_notifier; blk_add_insert_bs_notifier(conf->conf.blk, &s->insert_notifier); blk_add_remove_bs_notifier(conf->conf.blk, &s->remove_notifier); data_plane_set_up_op_blockers(s); *dataplane = s; }
static gpointer iothread_g_main_context_init(gpointer opaque) { AioContext *ctx; IOThread *iothread = opaque; GSource *source; iothread->worker_context = g_main_context_new(); ctx = iothread_get_aio_context(iothread); source = aio_get_g_source(ctx); g_source_attach(source, iothread->worker_context); g_source_unref(source); aio_notify(iothread->ctx); return NULL; }
/* Context: QEMU global mutex held */ void virtio_scsi_set_iothread(VirtIOSCSI *s, IOThread *iothread) { BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); assert(!s->ctx); s->ctx = iothread_get_aio_context(vs->conf.iothread); /* Don't try if transport does not support notifiers. */ if (!k->set_guest_notifiers || !k->set_host_notifier) { fprintf(stderr, "virtio-scsi: Failed to set iothread " "(transport does not support notifiers)"); exit(1); } }
static void virtio_balloon_device_realize(DeviceState *dev, Error **errp) { VirtIODevice *vdev = VIRTIO_DEVICE(dev); VirtIOBalloon *s = VIRTIO_BALLOON(dev); int ret; virtio_init(vdev, "virtio-balloon", VIRTIO_ID_BALLOON, sizeof(struct virtio_balloon_config)); ret = qemu_add_balloon_handler(virtio_balloon_to_target, virtio_balloon_stat, s); if (ret < 0) { error_setg(errp, "Only one balloon device is supported"); virtio_cleanup(vdev); return; } s->ivq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); s->dvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output); s->svq = virtio_add_queue(vdev, 128, virtio_balloon_receive_stats); if (virtio_has_feature(s->host_features, VIRTIO_BALLOON_F_FREE_PAGE_HINT)) { s->free_page_vq = virtio_add_queue(vdev, VIRTQUEUE_MAX_SIZE, virtio_balloon_handle_free_page_vq); s->free_page_report_status = FREE_PAGE_REPORT_S_STOP; s->free_page_report_cmd_id = VIRTIO_BALLOON_FREE_PAGE_REPORT_CMD_ID_MIN; s->free_page_report_notify.notify = virtio_balloon_free_page_report_notify; precopy_add_notifier(&s->free_page_report_notify); if (s->iothread) { object_ref(OBJECT(s->iothread)); s->free_page_bh = aio_bh_new(iothread_get_aio_context(s->iothread), virtio_ballloon_get_free_page_hints, s); qemu_mutex_init(&s->free_page_lock); qemu_cond_init(&s->free_page_cond); s->block_iothread = false; } else { /* Simply disable this feature if the iothread wasn't created. */ s->host_features &= ~(1 << VIRTIO_BALLOON_F_FREE_PAGE_HINT); virtio_error(vdev, "iothread is missing"); } } reset_stats(s); }
static void blk_alloc(struct XenDevice *xendev) { struct XenBlkDev *blkdev = container_of(xendev, struct XenBlkDev, xendev); Error *err = NULL; trace_xen_disk_alloc(xendev->name); QLIST_INIT(&blkdev->inflight); QLIST_INIT(&blkdev->finished); QLIST_INIT(&blkdev->freelist); blkdev->iothread = iothread_create(xendev->name, &err); assert(!err); blkdev->ctx = iothread_get_aio_context(blkdev->iothread); blkdev->bh = aio_bh_new(blkdev->ctx, blk_bh, blkdev); }
/* Context: QEMU global mutex held */ void virtio_scsi_dataplane_stop(VirtIOSCSI *s) { BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(s))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); int i; if (!s->dataplane_started || s->dataplane_stopping) { return; } /* Better luck next time. */ if (s->dataplane_fenced) { s->dataplane_fenced = false; s->dataplane_started = false; return; } s->dataplane_stopping = true; assert(s->ctx == iothread_get_aio_context(vs->conf.iothread)); aio_context_acquire(s->ctx); virtio_scsi_clear_aio(s); blk_drain_all(); /* ensure there are no in-flight requests */ aio_context_release(s->ctx); for (i = 0; i < vs->conf.num_queues + 2; i++) { k->set_host_notifier(qbus->parent, i, false); } /* Clean up guest notifier (irq) */ k->set_guest_notifiers(qbus->parent, vs->conf.num_queues + 2, false); s->dataplane_stopping = false; s->dataplane_started = false; }
XenBlockDataPlane *xen_block_dataplane_create(XenDevice *xendev, BlockConf *conf, IOThread *iothread) { XenBlockDataPlane *dataplane = g_new0(XenBlockDataPlane, 1); dataplane->xendev = xendev; dataplane->blk = conf->blk; QLIST_INIT(&dataplane->inflight); QLIST_INIT(&dataplane->freelist); if (iothread) { dataplane->iothread = iothread; object_ref(OBJECT(dataplane->iothread)); dataplane->ctx = iothread_get_aio_context(dataplane->iothread); } else { dataplane->ctx = qemu_get_aio_context(); } dataplane->bh = aio_bh_new(dataplane->ctx, xen_block_dataplane_bh, dataplane); return dataplane; }
/* Context: QEMU global mutex held */ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf, VirtIOBlockDataPlane **dataplane, Error **errp) { VirtIOBlockDataPlane *s; Error *local_err = NULL; BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); *dataplane = NULL; if (!conf->data_plane && !conf->iothread) { return; } /* Don't try if transport does not support notifiers. */ if (!k->set_guest_notifiers || !k->set_host_notifier) { error_setg(errp, "device is incompatible with x-data-plane " "(transport does not support notifiers)"); return; } /* If dataplane is (re-)enabled while the guest is running there could be * block jobs that can conflict. */ if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, &local_err)) { error_setg(errp, "cannot start dataplane thread: %s", error_get_pretty(local_err)); error_free(local_err); return; } s = g_new0(VirtIOBlockDataPlane, 1); s->vdev = vdev; s->conf = conf; if (conf->iothread) { s->iothread = conf->iothread; object_ref(OBJECT(s->iothread)); } else { /* Create per-device IOThread if none specified. This is for * x-data-plane option compatibility. If x-data-plane is removed we * can drop this. */ object_initialize(&s->internal_iothread_obj, sizeof(s->internal_iothread_obj), TYPE_IOTHREAD); user_creatable_complete(OBJECT(&s->internal_iothread_obj), &error_abort); s->iothread = &s->internal_iothread_obj; } s->ctx = iothread_get_aio_context(s->iothread); s->bh = aio_bh_new(s->ctx, notify_guest_bh, s); error_setg(&s->blocker, "block device is in use by data plane"); blk_op_block_all(conf->conf.blk, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_BACKUP_SOURCE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_CHANGE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_SOURCE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_COMMIT_TARGET, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EJECT, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_EXTERNAL_SNAPSHOT, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_INTERNAL_SNAPSHOT_DELETE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_MIRROR, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_STREAM, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_REPLACE, s->blocker); *dataplane = s; }
static void handle_notify(EventNotifier *e) { VirtIOBlockDataPlane *s = container_of(e, VirtIOBlockDataPlane, host_notifier); VirtIOBlock *vblk = VIRTIO_BLK(s->vdev); event_notifier_test_and_clear(&s->host_notifier); blk_io_plug(s->conf->conf.blk); for (;;) { MultiReqBuffer mrb = { .num_writes = 0, }; int ret; /* Disable guest->host notifies to avoid unnecessary vmexits */ vring_disable_notification(s->vdev, &s->vring); for (;;) { VirtIOBlockReq *req = virtio_blk_alloc_request(vblk); ret = vring_pop(s->vdev, &s->vring, &req->elem); if (ret < 0) { virtio_blk_free_request(req); break; /* no more requests */ } trace_virtio_blk_data_plane_process_request(s, req->elem.out_num, req->elem.in_num, req->elem.index); virtio_blk_handle_request(req, &mrb); } virtio_submit_multiwrite(s->conf->conf.blk, &mrb); if (likely(ret == -EAGAIN)) { /* vring emptied */ /* Re-enable guest->host notifies and stop processing the vring. * But if the guest has snuck in more descriptors, keep processing. */ if (vring_enable_notification(s->vdev, &s->vring)) { break; } } else { /* fatal error */ break; } } blk_io_unplug(s->conf->conf.blk); } /* Context: QEMU global mutex held */ void virtio_blk_data_plane_create(VirtIODevice *vdev, VirtIOBlkConf *conf, VirtIOBlockDataPlane **dataplane, Error **errp) { VirtIOBlockDataPlane *s; Error *local_err = NULL; BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); *dataplane = NULL; if (!conf->data_plane && !conf->iothread) { return; } /* Don't try if transport does not support notifiers. */ if (!k->set_guest_notifiers || !k->set_host_notifier) { error_setg(errp, "device is incompatible with x-data-plane " "(transport does not support notifiers)"); return; } /* If dataplane is (re-)enabled while the guest is running there could be * block jobs that can conflict. */ if (blk_op_is_blocked(conf->conf.blk, BLOCK_OP_TYPE_DATAPLANE, &local_err)) { error_setg(errp, "cannot start dataplane thread: %s", error_get_pretty(local_err)); error_free(local_err); return; } s = g_new0(VirtIOBlockDataPlane, 1); s->vdev = vdev; s->conf = conf; if (conf->iothread) { s->iothread = conf->iothread; object_ref(OBJECT(s->iothread)); } else { /* Create per-device IOThread if none specified. This is for * x-data-plane option compatibility. If x-data-plane is removed we * can drop this. */ object_initialize(&s->internal_iothread_obj, sizeof(s->internal_iothread_obj), TYPE_IOTHREAD); user_creatable_complete(OBJECT(&s->internal_iothread_obj), &error_abort); s->iothread = &s->internal_iothread_obj; } s->ctx = iothread_get_aio_context(s->iothread); s->bh = aio_bh_new(s->ctx, notify_guest_bh, s); error_setg(&s->blocker, "block device is in use by data plane"); blk_op_block_all(conf->conf.blk, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_RESIZE, s->blocker); blk_op_unblock(conf->conf.blk, BLOCK_OP_TYPE_DRIVE_DEL, s->blocker); *dataplane = s; }