qmp: add QMP command x-query-virtio-status
This new command shows the status of a VirtIODevice, including its corresponding vhost device's status (if active). Next patch will improve output by decoding feature bits, including vhost device's feature bits (backend, protocol, acked, and features). Also will decode status bits of a VirtIODevice. [Jonah: From patch v12; added a check to @virtio_device_find to ensure synchronicity between @virtio_list and the devices in the QOM composition tree.] Signed-off-by: Laurent Vivier <lvivier@redhat.com> Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com> Message-Id: <1660220684-24909-3-git-send-email-jonah.palmer@oracle.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Laurent Vivier
Michael S. Tsirkin
parent
a5ebce3857
commit
90c066cd68
@ -12,3 +12,8 @@ VirtioInfoList *qmp_x_query_virtio(Error **errp)
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{
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return qmp_virtio_unsupported(errp);
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}
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VirtioStatus *qmp_x_query_virtio_status(const char *path, Error **errp)
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{
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return qmp_virtio_unsupported(errp);
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}
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@ -3948,6 +3948,110 @@ VirtioInfoList *qmp_x_query_virtio(Error **errp)
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return list;
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}
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static VirtIODevice *virtio_device_find(const char *path)
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{
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VirtIODevice *vdev;
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QTAILQ_FOREACH(vdev, &virtio_list, next) {
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DeviceState *dev = DEVICE(vdev);
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if (strcmp(dev->canonical_path, path) != 0) {
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continue;
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}
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Error *err = NULL;
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QObject *obj = qmp_qom_get(dev->canonical_path, "realized", &err);
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if (err == NULL) {
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GString *is_realized = qobject_to_json_pretty(obj, true);
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/* virtio device is NOT realized, remove it from list */
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if (!strncmp(is_realized->str, "false", 4)) {
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g_string_free(is_realized, true);
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qobject_unref(obj);
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QTAILQ_REMOVE(&virtio_list, vdev, next);
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return NULL;
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}
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g_string_free(is_realized, true);
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} else {
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/* virtio device doesn't exist in QOM tree */
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QTAILQ_REMOVE(&virtio_list, vdev, next);
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qobject_unref(obj);
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return NULL;
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}
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/* device exists in QOM tree & is realized */
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qobject_unref(obj);
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return vdev;
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}
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return NULL;
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}
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VirtioStatus *qmp_x_query_virtio_status(const char *path, Error **errp)
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{
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VirtIODevice *vdev;
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VirtioStatus *status;
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vdev = virtio_device_find(path);
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if (vdev == NULL) {
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error_setg(errp, "Path %s is not a VirtIODevice", path);
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return NULL;
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}
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status = g_new0(VirtioStatus, 1);
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status->name = g_strdup(vdev->name);
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status->device_id = vdev->device_id;
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status->vhost_started = vdev->vhost_started;
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status->guest_features = vdev->guest_features;
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status->host_features = vdev->host_features;
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status->backend_features = vdev->backend_features;
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switch (vdev->device_endian) {
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case VIRTIO_DEVICE_ENDIAN_LITTLE:
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status->device_endian = g_strdup("little");
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break;
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case VIRTIO_DEVICE_ENDIAN_BIG:
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status->device_endian = g_strdup("big");
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break;
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default:
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status->device_endian = g_strdup("unknown");
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break;
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}
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status->num_vqs = virtio_get_num_queues(vdev);
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status->status = vdev->status;
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status->isr = vdev->isr;
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status->queue_sel = vdev->queue_sel;
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status->vm_running = vdev->vm_running;
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status->broken = vdev->broken;
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status->disabled = vdev->disabled;
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status->use_started = vdev->use_started;
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status->started = vdev->started;
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status->start_on_kick = vdev->start_on_kick;
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status->disable_legacy_check = vdev->disable_legacy_check;
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status->bus_name = g_strdup(vdev->bus_name);
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status->use_guest_notifier_mask = vdev->use_guest_notifier_mask;
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status->has_vhost_dev = vdev->vhost_started;
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if (vdev->vhost_started) {
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_GET_CLASS(vdev);
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struct vhost_dev *hdev = vdc->get_vhost(vdev);
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status->vhost_dev = g_new0(VhostStatus, 1);
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status->vhost_dev->n_mem_sections = hdev->n_mem_sections;
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status->vhost_dev->n_tmp_sections = hdev->n_tmp_sections;
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status->vhost_dev->nvqs = hdev->nvqs;
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status->vhost_dev->vq_index = hdev->vq_index;
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status->vhost_dev->features = hdev->features;
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status->vhost_dev->acked_features = hdev->acked_features;
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status->vhost_dev->backend_features = hdev->backend_features;
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status->vhost_dev->protocol_features = hdev->protocol_features;
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status->vhost_dev->max_queues = hdev->max_queues;
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status->vhost_dev->backend_cap = hdev->backend_cap;
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status->vhost_dev->log_enabled = hdev->log_enabled;
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status->vhost_dev->log_size = hdev->log_size;
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}
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return status;
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}
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static const TypeInfo virtio_device_info = {
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.name = TYPE_VIRTIO_DEVICE,
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.parent = TYPE_DEVICE,
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222
qapi/virtio.json
222
qapi/virtio.json
@ -66,3 +66,225 @@
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{ 'command': 'x-query-virtio',
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'returns': [ 'VirtioInfo' ],
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'features': [ 'unstable' ] }
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##
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# @VhostStatus:
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#
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# Information about a vhost device. This information will only be
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# displayed if the vhost device is active.
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#
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# @n-mem-sections: vhost_dev n_mem_sections
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#
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# @n-tmp-sections: vhost_dev n_tmp_sections
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#
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# @nvqs: vhost_dev nvqs (number of virtqueues being used)
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#
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# @vq-index: vhost_dev vq_index
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#
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# @features: vhost_dev features
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#
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# @acked-features: vhost_dev acked_features
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#
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# @backend-features: vhost_dev backend_features
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#
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# @protocol-features: vhost_dev protocol_features
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#
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# @max-queues: vhost_dev max_queues
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#
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# @backend-cap: vhost_dev backend_cap
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#
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# @log-enabled: vhost_dev log_enabled flag
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#
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# @log-size: vhost_dev log_size
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#
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# Since: 7.1
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#
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##
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{ 'struct': 'VhostStatus',
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'data': { 'n-mem-sections': 'int',
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'n-tmp-sections': 'int',
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'nvqs': 'uint32',
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'vq-index': 'int',
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'features': 'uint64',
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'acked-features': 'uint64',
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'backend-features': 'uint64',
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'protocol-features': 'uint64',
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'max-queues': 'uint64',
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'backend-cap': 'uint64',
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'log-enabled': 'bool',
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'log-size': 'uint64' } }
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##
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# @VirtioStatus:
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#
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# Full status of the virtio device with most VirtIODevice members.
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# Also includes the full status of the corresponding vhost device
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# if the vhost device is active.
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#
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# @name: VirtIODevice name
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#
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# @device-id: VirtIODevice ID
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#
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# @vhost-started: VirtIODevice vhost_started flag
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#
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# @guest-features: VirtIODevice guest_features
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#
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# @host-features: VirtIODevice host_features
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#
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# @backend-features: VirtIODevice backend_features
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#
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# @device-endian: VirtIODevice device_endian
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#
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# @num-vqs: VirtIODevice virtqueue count. This is the number of active
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# virtqueues being used by the VirtIODevice.
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#
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# @status: VirtIODevice configuration status (VirtioDeviceStatus)
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#
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# @isr: VirtIODevice ISR
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#
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# @queue-sel: VirtIODevice queue_sel
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#
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# @vm-running: VirtIODevice vm_running flag
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#
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# @broken: VirtIODevice broken flag
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#
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# @disabled: VirtIODevice disabled flag
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#
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# @use-started: VirtIODevice use_started flag
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#
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# @started: VirtIODevice started flag
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#
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# @start-on-kick: VirtIODevice start_on_kick flag
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#
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# @disable-legacy-check: VirtIODevice disabled_legacy_check flag
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#
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# @bus-name: VirtIODevice bus_name
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#
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# @use-guest-notifier-mask: VirtIODevice use_guest_notifier_mask flag
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#
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# @vhost-dev: Corresponding vhost device info for a given VirtIODevice.
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# Present if the given VirtIODevice has an active vhost
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# device.
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#
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# Since: 7.1
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#
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##
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{ 'struct': 'VirtioStatus',
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'data': { 'name': 'str',
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'device-id': 'uint16',
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'vhost-started': 'bool',
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'device-endian': 'str',
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'guest-features': 'uint64',
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'host-features': 'uint64',
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'backend-features': 'uint64',
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'num-vqs': 'int',
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'status': 'uint8',
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'isr': 'uint8',
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'queue-sel': 'uint16',
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'vm-running': 'bool',
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'broken': 'bool',
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'disabled': 'bool',
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'use-started': 'bool',
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'started': 'bool',
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'start-on-kick': 'bool',
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'disable-legacy-check': 'bool',
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'bus-name': 'str',
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'use-guest-notifier-mask': 'bool',
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'*vhost-dev': 'VhostStatus' } }
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##
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# @x-query-virtio-status:
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#
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# Poll for a comprehensive status of a given virtio device
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#
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# @path: Canonical QOM path of the VirtIODevice
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#
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# Features:
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# @unstable: This command is meant for debugging.
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#
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# Returns: VirtioStatus of the virtio device
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#
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# Since: 7.1
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#
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# Examples:
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#
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# 1. Poll for the status of virtio-crypto (no vhost-crypto active)
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#
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# -> { "execute": "x-query-virtio-status",
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# "arguments": { "path": "/machine/peripheral/crypto0/virtio-backend" }
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# }
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# <- { "return": {
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# "device-endian": "little",
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# "bus-name": "",
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# "disable-legacy-check": false,
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# "name": "virtio-crypto",
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# "started": true,
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# "device-id": 20,
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# "backend-features": 0,
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# "start-on-kick": false,
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# "isr": 1,
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# "broken": false,
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# "status": 15,
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# "num-vqs": 2,
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# "guest-features": 5100273664,
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# "host-features": 6325010432,
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# "use-guest-notifier-mask": true,
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# "vm-running": true,
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# "queue-sel": 1,
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# "disabled": false,
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# "vhost-started": false,
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# "use-started": true
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# }
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# }
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#
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# 2. Poll for the status of virtio-net (vhost-net is active)
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#
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# -> { "execute": "x-query-virtio-status",
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# "arguments": { "path": "/machine/peripheral-anon/device[1]/virtio-backend" }
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# }
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# <- { "return": {
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# "device-endian": "little",
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# "bus-name": "",
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# "disabled-legacy-check": false,
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# "name": "virtio-net",
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# "started": true,
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# "device-id": 1,
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# "vhost-dev": {
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# "n-tmp-sections": 4,
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# "n-mem-sections": 4,
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# "max-queues": 1,
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# "backend-cap": 2,
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# "log-size": 0,
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# "backend-features": 0,
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# "nvqs": 2,
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# "protocol-features": 0,
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# "vq-index": 0,
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# "log-enabled": false,
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# "acked-features": 5100306432,
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# "features": 13908344832
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# },
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# "backend-features": 6337593319,
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# "start-on-kick": false,
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# "isr": 1,
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# "broken": false,
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# "status": 15,
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# "num-vqs": 3,
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# "guest-features": 5111807911,
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# "host-features": 6337593319,
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# "use-guest-notifier-mask": true,
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# "vm-running": true,
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# "queue-sel": 2,
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# "disabled": false,
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# "vhost-started": true,
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# "use-started": true
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# }
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# }
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#
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##
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{ 'command': 'x-query-virtio-status',
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'data': { 'path': 'str' },
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'returns': 'VirtioStatus',
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'features': [ 'unstable' ] }
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