vtballoon_config_change_intr
static void vtballoon_config_change_intr(void *);
info[2] = (struct irqmap){0, -1, vtballoon_config_change_intr, "config"};
info[2] = (struct irqmap){1, -1, vtballoon_config_change_intr, "config"};
info[2] = (struct irqmap){2, -1, vtballoon_config_change_intr, "config"};
info[2] = (struct irqmap){3, -1, vtballoon_config_change_intr, "config"};