pub const EXTRA_DEVICE_ADDR_BASE: usize = 16;Expand description
First PCI device number (addr=) used for extra-device root ports.
QEMU’s built-in devices use low device numbers. We start at 16 (0x10)
to avoid collisions. The root port for the i-th extra device has
devfn = (EXTRA_DEVICE_ADDR_BASE + i) << 3.