mst pointed me to this patch: commit 3aa31d7d6375303fc88438021aad485f50bb1e39 Author: Marcel Apfelbaum <marcel.a> Date: Mon Jun 23 18:29:51 2014 +0300 hw/pci: reserve IO and mem for pci express downstream ports with no devices It's needed to make pci-e hotplug work with qemu 2.1
Gerd committed it to master. Also created a 1.7.5 stable branch and cherry-picked the patch into that branch.
Fixed in seabios-1.7.5-3.fc22