vtpci_read_config_2
if (vtpci_read_config_2(sc, offset) != vector) {
vq_size = vtpci_read_config_2(sc, VIRTIO_PCI_QUEUE_NUM);
vq_size = vtpci_read_config_2(sc, VIRTIO_PCI_QUEUE_NUM);
*(uint16_t *)d = vtpci_read_config_2(sc, off);