void user_set_protocol_features(struct vhost_device_ctx ctx,
uint64_t protocol_features);
int user_set_log_base(struct vhost_device_ctx ctx, struct VhostUserMsg *);
void user_set_protocol_features(struct vhost_device_ctx ctx,
uint64_t protocol_features);
int user_set_log_base(struct vhost_device_ctx ctx, struct VhostUserMsg *);
int user_get_vring_base(struct vhost_device_ctx, struct vhost_vring_state *);
int user_set_vring_enable(struct vhost_device_ctx ctx,
struct vhost_vring_state *state);
int user_get_vring_base(struct vhost_device_ctx, struct vhost_vring_state *);
int user_set_vring_enable(struct vhost_device_ctx ctx,
struct vhost_vring_state *state);