Comment 10 for bug 1561497

i am not familar with the mips emulation but just in case its useful I suspect this is related to the machine type
https://www.qemu.org/docs/master/system/target-mips.html
the default one i don't think support PCI devices so malta? might be required.

the Loongson-3 virtual platform might also be work trying
https://www.phoronix.com/scan.php?page=news_item&px=Loongson3-Linux-5.8-KVM-Virt
it sound like it a realitive recent platform.

https://listman.redhat.com/archives/libvir-list/2016-May/msg00197.html
which you reference before was related to the malta machine type.
so it seam to confirm it has a root PCIe controller so that is probably the best place to start.