Again:
This is wrong
hostpci0: 43:00.0,pcie=1,x-vga=on
hostpci1: 43:00.1,pcie=1
right:
hostpci0: 43:00,pcie=1,x-vga=on,romfile=vbios.bin
I would also recommend using a bios romfile.
Must be located in: /usr/share/kvm/"vbios.bin"
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can you check this...