Comment 5 for bug 1576347

"if=virtio" (which similarly has one controller per drive and has each controller occupies a pci slot as the nvme emulation) works fine:

qemu-system-x86_64 -enable-kvm -cpu host -smp cores=4 -m 4G -net bridge -net nic -full-screen -drive file=ovmf_x64.bin,format=raw,if=pflash -drive file=disks/win16_ide.img,format=raw,cache=none,aio=native -drive file=disks/one.img,if=virtio,format=qcow2,id=one -drive file=disks/two.img,if=virtio,format=qcow2,id=two