Looking at the QEMU code it seems to me that QEMU would simply reject PCI devices with domain bigger than 0xFFFF [1]. I'm not sure if this limitation also valid for QEMU with accel=kvm.
[1] https://github.com/qemu/qemu/blob/f2a1cf9180f63e88bb38ff21c169da97c3f2bad5/hw/core/qdev-properties.c#L993
Looking at the QEMU code it seems to me that QEMU would simply reject PCI devices with domain bigger than 0xFFFF [1]. I'm not sure if this limitation also valid for QEMU with accel=kvm.
[1] https:/ /github. com/qemu/ qemu/blob/ f2a1cf9180f63e8 8bb38ff21c169da 97c3f2bad5/ hw/core/ qdev-properties .c#L993