Greetings,

I am having serious issues trying to pass through this older card after installing a new motherboard. The VM was working fine, pass through as normal the GPU & Sound. Started the VM and all was working fine. Restarted Unraid and went into the VM and the graphics was set to 800x600. Went to device manager and found the the video was missing. Rebooted the VM a few times and once it loaded a driver and for that session was operating "normal". Restarted to see if it would hold, it didn't. I tried to install AMD drivers and each time it failed for it says the hardware is missing.

unraid-diagnostics-20220913-1815.zip

Edited September 13, 20223 yr by Sabot

17 hours ago, Sabot said:

Went to device manager and found the the video was missing

17 hours ago, Sabot said:

I tried to install AMD drivers and each time it failed for it says the hardware is missing

 

Since the gpu is quite old, and I imagine the drivers too, they may expect the sound to be on the same bus/slot but different function (which it is in the real hardware, but not in the vm), so I would give a try by modifying the vm xml from this:

    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x0c' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x0c' slot='0x00' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x05' slot='0x00' function='0x0'/>
    </hostdev>

 

To this:

    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x0c' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x0' multifunction='on'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x0c' slot='0x00' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x04' slot='0x00' function='0x1'/>
    </hostdev>