Stixbnr32
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Stixbnr32's post in Intel 13th Gen Z790 ASRock board AMD RX 7900xt passthrough wont work was marked as the answerFixed.
Added
<features>
<acpi/>
<apic/>
<hyperv mode='custom'>
<relaxed state='on'/>
<vapic state='on'/>
<spinlocks state='on' retries='8191'/>
<vendor_id state='on' value='1234567890ab'/>
</hyperv>
<kvm>
<hidden state='on'/>
</kvm>
and
<qemu:commandline>
<qemu:arg value='-fw_cfg'/>
<qemu:arg value='opt/ovmf/X-PciMmio64Mb,string=65536'/>
</qemu:commandline>
At the end before the closing </domain> tag.
The VM will not boot if ReBAR is enabled and these params are not added.
I now how it working with iGPU as well for plex and W11 with rebar enabled in UEFI mode with vbios passthru from techpowerup.
What a mission but we are there.