How guest interacts with Virtio Netdev

QEMU assigns a dedicated PCI device to the Virtio device id,device IDs (vendor ID 0X1AF4) from 0x1000 through 0X10FF, The vendor ID and device ID in the PCI subsystem became the Virtio type and the vendor domain, so the PCI driver does not need to know the true meaning of the Virtio device type, and for kernel only registers a struct virtio_device, It is mounted on the Virtio bus type and is driven by the Virtio driver.

The Virtio device is used as a PCI device for the device type in the Linux kernel, so it has all the properties of the PCI device, so it also has a PCI configuration space.

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http://luoye.me/2014/08/05/virtio-dev-op/

How guest interacts with Virtio Netdev