Hey Team,

 

I have tried everything to get my RX 7900XT passthrough to work in UEFI mode but no luck.

 

The reason i want this is to use Resizable bar and gain some extra performance.   Whatever combo I try with all the tips and tricks i cannot get it to show video.

vbios or no vbios.

 

i even upgraded to 7 beta2 to get the extra vm features and make sure multifuction is passed through.

 

I have passthrough working on an old i9 7900x with an rtx 3070 with resizable bar (yes it does work with x299 chipset).

 

I had this going on CSM (legacy boot) but do NOT want this as im leaving peformance on the table and cannot use quick sync for plex if i do it this way as the onboard gpu gets turned off.

 

Thanks.

Edited July 17, 20241 yr by Stixbnr32

Fixed.

 

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.