These are the features listed in vhost show on a port where vhost reconnect works:
features mask (0xffffffffffffffff):
features (0x50008000):
VIRTIO_NET_F_MRG_RXBUF (15)
VIRTIO_F_INDIRECT_DESC (28)
VHOST_USER_F_PROTOCOL_FEATURES (30)
protocol features (0x3)
VHOST_USER_PROTOCOL_F_MQ (0)
VHOST_USER_PROTOCOL_F_LOG_SHMFD (1)

However, sometimes the port is created with less features:
features mask (0xffffffffffffffff):
features (0x60003140):
VHOST_USER_F_PROTOCOL_FEATURES (30)
protocol features (0x3)
VHOST_USER_PROTOCOL_F_MQ (0)
VHOST_USER_PROTOCOL_F_LOG_SHMFD (1)