Function arch::generate_pci_root

pub fn generate_pci_root(
    devices: Vec<(Box<dyn PciDevice>, Option<Minijail>)>,
    irq_chip: &mut dyn IrqChip,
    mmio_bus: Arc<Bus>,
    mmio_base: GuestAddress,
    mmio_register_bit_num: usize,
    io_bus: Arc<Bus>,
    resources: &mut SystemAllocator,
    vm: &mut impl Vm,
    max_irqs: usize,
    vcfg_base: Option<u64>,
    swap_controller: &mut Option<SwapController>
) -> Result<(PciRoot, Vec<(PciAddress, u32, PciInterruptPin)>, BTreeMap<u32, String>, BTreeMap<PciAddress, Vec<u8>>, BTreeMap<PciAddress, Vec<u8>>), DeviceRegistrationError>

Creates a root PCI device for use by this Vm.