The ioh3420 is named root.1. You have the Radeon (01:00.0) attached to it, but
the HDMI (01:00.1) is attached to pcie.0, which is the default name of the Q35
Bus. Put it at root.1 too.Also, the addr for the HDMI has to be at Function 1
of the Radeon.
-device
ioh3420,bus=pcie.0,addr=1c.0,multifunction=on,port=1,chassis=1,id=root.1
\-device
vfio-pci,host=01:00.0,bus=root.1,addr=00.0,multifunction=on,romfile=/opt/kvm/images/Sapphire.R9290.4096.140115_1.rom
\-device vfio-pci,host=01:00.1,bus=root.0,addr=00.1 \
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