Add following qemu arg to the VM's XML::
...
<qemu:commandline>
...
<qemu:arg value='-global'/>
<qemu:arg value='ICH9-LPC.acpi-pci-hotplug-with-bridge-support=off'/>
...
Add boot-args to the OpenCore config.plist:
agdpmod=pikera
shikigva=128 unfairgva=1 # fix DRM support