vtpci_write_config_2
vtpci_write_config_2(sc, offset, vector);
vtpci_write_config_2(sc, VIRTIO_PCI_QUEUE_SEL, queue);
vtpci_write_config_2(sc, VIRTIO_PCI_QUEUE_SEL, what);
vtpci_write_config_2(sc, VIRTIO_PCI_QUEUE_SEL, what);
vtpci_write_config_2(sc, VIRTIO_PCI_QUEUE_SEL, queue);
vtpci_write_config_2(sc, VIRTIO_PCI_QUEUE_NOTIFY, queue);
vtpci_write_config_2(sc, off, *(uint16_t *)s);