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c2c51dc9d1
Copied from crosvm 107edb3e with one main modification: VirtioPciDevice implements BusDevice. We need this modification because it is the only way for us to be able to add a VirtioPciDevice to the MMIO bus. Bus insertion takes a BusDevice. The fact that VirtioPciDevice implements PciDevice which itself implements BusDevice does not mean that Rust will automatically downcast a VirtioPciDevice into a BusDevice. crosvm works around that issue by having the PCI, virtio and BusDevice implementations in the same crate. Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>