qemu

vhost-user-vsock.c (4710B)

---

 /*
  * Vhost-user vsock virtio device
  *
  * Copyright 2020 Red Hat, Inc.
  *
  * This work is licensed under the terms of the GNU GPL, version 2 or
  * (at your option) any later version.  See the COPYING file in the
  * top-level directory.
  */
 
 #include "qemu/osdep.h"
 
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "hw/qdev-properties.h"
 #include "hw/qdev-properties-system.h"
 #include "hw/virtio/vhost-user-vsock.h"
 
 static const int user_feature_bits[] = {
     VIRTIO_F_VERSION_1,
     VIRTIO_RING_F_INDIRECT_DESC,
     VIRTIO_RING_F_EVENT_IDX,
     VIRTIO_F_NOTIFY_ON_EMPTY,
     VHOST_INVALID_FEATURE_BIT
 };
 
 static void vuv_get_config(VirtIODevice *vdev, uint8_t *config)
 {
     VHostUserVSock *vsock = VHOST_USER_VSOCK(vdev);
 
     memcpy(config, &vsock->vsockcfg, sizeof(struct virtio_vsock_config));
 }
 
 static int vuv_handle_config_change(struct vhost_dev *dev)
 {
     VHostUserVSock *vsock = VHOST_USER_VSOCK(dev->vdev);
     Error *local_err = NULL;
     int ret = vhost_dev_get_config(dev, (uint8_t *)&vsock->vsockcfg,
                                    sizeof(struct virtio_vsock_config),
                                    &local_err);
     if (ret < 0) {
         error_report_err(local_err);
         return -1;
     }
 
     virtio_notify_config(dev->vdev);
 
     return 0;
 }
 
 const VhostDevConfigOps vsock_ops = {
     .vhost_dev_config_notifier = vuv_handle_config_change,
 };
 
 static void vuv_set_status(VirtIODevice *vdev, uint8_t status)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
     bool should_start = virtio_device_should_start(vdev, status);
 
     if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) {
         return;
     }
 
     if (should_start) {
         int ret = vhost_vsock_common_start(vdev);
         if (ret < 0) {
             return;
         }
     } else {
         vhost_vsock_common_stop(vdev);
     }
 }
 
 static uint64_t vuv_get_features(VirtIODevice *vdev,
                                  uint64_t features,
                                  Error **errp)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
 
     features = vhost_get_features(&vvc->vhost_dev, user_feature_bits, features);
 
     return vhost_vsock_common_get_features(vdev, features, errp);
 }
 
 static const VMStateDescription vuv_vmstate = {
     .name = "vhost-user-vsock",
     .unmigratable = 1,
 };
 
 static void vuv_device_realize(DeviceState *dev, Error **errp)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
     int ret;
 
     if (!vsock->conf.chardev.chr) {
         error_setg(errp, "missing chardev");
         return;
     }
 
     if (!vhost_user_init(&vsock->vhost_user, &vsock->conf.chardev, errp)) {
         return;
     }
 
     vhost_vsock_common_realize(vdev);
 
     vhost_dev_set_config_notifier(&vvc->vhost_dev, &vsock_ops);
 
     ret = vhost_dev_init(&vvc->vhost_dev, &vsock->vhost_user,
                          VHOST_BACKEND_TYPE_USER, 0, errp);
     if (ret < 0) {
         goto err_virtio;
     }
 
     ret = vhost_dev_get_config(&vvc->vhost_dev, (uint8_t *)&vsock->vsockcfg,
                                sizeof(struct virtio_vsock_config), errp);
     if (ret < 0) {
         goto err_vhost_dev;
     }
 
     return;
 
 err_vhost_dev:
     vhost_dev_cleanup(&vvc->vhost_dev);
 err_virtio:
     vhost_vsock_common_unrealize(vdev);
     vhost_user_cleanup(&vsock->vhost_user);
     return;
 }
 
 static void vuv_device_unrealize(DeviceState *dev)
 {
     VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
     VirtIODevice *vdev = VIRTIO_DEVICE(dev);
     VHostUserVSock *vsock = VHOST_USER_VSOCK(dev);
 
     /* This will stop vhost backend if appropriate. */
     vuv_set_status(vdev, 0);
 
     vhost_dev_cleanup(&vvc->vhost_dev);
 
     vhost_vsock_common_unrealize(vdev);
 
     vhost_user_cleanup(&vsock->vhost_user);
 
 }
 
 static Property vuv_properties[] = {
     DEFINE_PROP_CHR("chardev", VHostUserVSock, conf.chardev),
     DEFINE_PROP_END_OF_LIST(),
 };
 
 static void vuv_class_init(ObjectClass *klass, void *data)
 {
     DeviceClass *dc = DEVICE_CLASS(klass);
     VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
 
     device_class_set_props(dc, vuv_properties);
     dc->vmsd = &vuv_vmstate;
     vdc->realize = vuv_device_realize;
     vdc->unrealize = vuv_device_unrealize;
     vdc->get_features = vuv_get_features;
     vdc->get_config = vuv_get_config;
     vdc->set_status = vuv_set_status;
 }
 
 static const TypeInfo vuv_info = {
     .name = TYPE_VHOST_USER_VSOCK,
     .parent = TYPE_VHOST_VSOCK_COMMON,
     .instance_size = sizeof(VHostUserVSock),
     .class_init = vuv_class_init,
 };
 
 static void vuv_register_types(void)
 {
     type_register_static(&vuv_info);
 }
 
 type_init(vuv_register_types)