>> I run QEMU with the following command:

>> -device vfio-pci,host=01:00.0,x-vga=on -device vfio-pci,host=01:00.1


You are missing the PCIe Root Bridge, and attaching the GPU to it. Linux is 
picky about that.

Try with this:

-device ioh3420,chassis=0,id=testbus \

-device vfio-pci,host=01:00.0,multifunction=true,bus=testbus,addr=00.0,x-vga=on 
\
-device vfio-pci,host=01:00.1,bus=testbus,addr=00.1 \
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