I followed Spaceinvader One guide to get the video card to passthrough the VM.  When I start the VM I don't get any output from the video card. 

Any help would be appreciated.

 

And I did the VFIO configuration for the Nvidia card.
 

lrwxrwxrwx 1 root root    0 Feb 19 20:06 0000:40:01.0 -> ../../../../devices/pci0000:40/0000:40:01.0
lrwxrwxrwx 1 root root    0 Feb 19 20:06 0000:40:03.0 -> ../../../../devices/pci0000:40/0000:40:03.0
lrwxrwxrwx 1 root root    0 Feb 19 20:06 0000:41:00.0 -> ../../../../devices/pci0000:40/0000:40:01.1/0000:41:00.0
lrwxrwxrwx 1 root root    0 Feb 19 20:06 0000:42:00.0 -> ../../../../devices/pci0000:40/0000:40:01.2/0000:42:00.0
lrwxrwxrwx 1 root root    0 Feb 19 20:06 0000:43:00.0 -> ../../../../devices/pci0000:40/0000:40:03.1/0000:43:00.0
lrwxrwxrwx 1 root root    0 Feb 19 20:06 0000:43:00.1 -> ../../../../devices/pci0000:40/0000:40:03.1/0000:43:00.1

 

Here is the XML from my VM.

<?xml version='1.0' encoding='UTF-8'?>
<domain type='kvm'>
  <name>Windows 11</name>
  <uuid>ded7597a-2f13-1524-8bc7-fea283070128</uuid>
  <metadata>
    <vmtemplate xmlns="unraid" name="Windows 11" icon="windows11.png" os="windowstpm"/>
  </metadata>
  <memory unit='KiB'>17301504</memory>
  <currentMemory unit='KiB'>17301504</currentMemory>
  <memoryBacking>
    <nosharepages/>
  </memoryBacking>
  <vcpu placement='static'>32</vcpu>
  <cputune>
    <vcpupin vcpu='0' cpuset='0'/>
    <vcpupin vcpu='1' cpuset='1'/>
    <vcpupin vcpu='2' cpuset='2'/>
    <vcpupin vcpu='3' cpuset='3'/>
    <vcpupin vcpu='4' cpuset='4'/>
    <vcpupin vcpu='5' cpuset='5'/>
    <vcpupin vcpu='6' cpuset='6'/>
    <vcpupin vcpu='7' cpuset='7'/>
    <vcpupin vcpu='8' cpuset='8'/>
    <vcpupin vcpu='9' cpuset='9'/>
    <vcpupin vcpu='10' cpuset='10'/>
    <vcpupin vcpu='11' cpuset='11'/>
    <vcpupin vcpu='12' cpuset='12'/>
    <vcpupin vcpu='13' cpuset='13'/>
    <vcpupin vcpu='14' cpuset='14'/>
    <vcpupin vcpu='15' cpuset='15'/>
    <vcpupin vcpu='16' cpuset='16'/>
    <vcpupin vcpu='17' cpuset='17'/>
    <vcpupin vcpu='18' cpuset='18'/>
    <vcpupin vcpu='19' cpuset='19'/>
    <vcpupin vcpu='20' cpuset='20'/>
    <vcpupin vcpu='21' cpuset='21'/>
    <vcpupin vcpu='22' cpuset='22'/>
    <vcpupin vcpu='23' cpuset='23'/>
    <vcpupin vcpu='24' cpuset='24'/>
    <vcpupin vcpu='25' cpuset='25'/>
    <vcpupin vcpu='26' cpuset='26'/>
    <vcpupin vcpu='27' cpuset='27'/>
    <vcpupin vcpu='28' cpuset='28'/>
    <vcpupin vcpu='29' cpuset='29'/>
    <vcpupin vcpu='30' cpuset='30'/>
    <vcpupin vcpu='31' cpuset='31'/>
  </cputune>
  <os>
    <type arch='x86_64' machine='pc-i440fx-7.2'>hvm</type>
    <loader readonly='yes' type='pflash'>/usr/share/qemu/ovmf-x64/OVMF_CODE-pure-efi-tpm.fd</loader>
    <nvram>/etc/libvirt/qemu/nvram/ded7597a-2f13-1524-8bc7-fea283070128_VARS-pure-efi-tpm.fd</nvram>
    <boot dev='hd'/>
  </os>
  <features>
    <acpi/>
    <apic/>
    <hyperv mode='custom'>
      <relaxed state='on'/>
      <vapic state='on'/>
      <spinlocks state='on' retries='8191'/>
      <vendor_id state='on' value='none'/>
    </hyperv>
  </features>
  <cpu mode='host-passthrough' check='none' migratable='on'>
    <topology sockets='1' dies='1' cores='16' threads='2'/>
    <cache mode='passthrough'/>
    <feature policy='require' name='topoext'/>
  </cpu>
  <clock offset='localtime'>
    <timer name='hypervclock' present='yes'/>
    <timer name='hpet' present='no'/>
  </clock>
  <on_poweroff>destroy</on_poweroff>
  <on_reboot>restart</on_reboot>
  <on_crash>restart</on_crash>
  <devices>
    <emulator>/usr/local/sbin/qemu</emulator>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/mnt/user/isos/Win11_23H2_English_x64.iso'/>
      <target dev='hda' bus='sata'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
    </disk>
    <disk type='file' device='cdrom'>
      <driver name='qemu' type='raw'/>
      <source file='/mnt/user/isos/virtio-win-0.1.240-1.iso'/>
      <target dev='hdb' bus='sata'/>
      <readonly/>
      <address type='drive' controller='0' bus='0' target='0' unit='1'/>
    </disk>
    <controller type='usb' index='0' model='ich9-ehci1'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x7'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci1'>
      <master startport='0'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x0' multifunction='on'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci2'>
      <master startport='2'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x1'/>
    </controller>
    <controller type='usb' index='0' model='ich9-uhci3'>
      <master startport='4'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x07' function='0x2'/>
    </controller>
    <controller type='pci' index='0' model='pci-root'/>
    <controller type='sata' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
    </controller>
    <controller type='virtio-serial' index='0'>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/>
    </controller>
    <interface type='bridge'>
      <mac address='52:54:00:d5:ff:ca'/>
      <source bridge='br0'/>
      <model type='virtio-net'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
    </interface>
    <serial type='pty'>
      <target type='isa-serial' port='0'>
        <model name='isa-serial'/>
      </target>
    </serial>
    <console type='pty'>
      <target type='serial' port='0'/>
    </console>
    <channel type='unix'>
      <target type='virtio' name='org.qemu.guest_agent.0'/>
      <address type='virtio-serial' controller='0' bus='0' port='1'/>
    </channel>
    <input type='mouse' bus='ps2'/>
    <input type='keyboard' bus='ps2'/>
    <tpm model='tpm-tis'>
      <backend type='emulator' version='2.0' persistent_state='yes'/>
    </tpm>
    <audio id='1' type='none'/>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x43' slot='0x00' function='0x0'/>
      </source>
      <rom file='/mnt/user/isos/BIOS/MSI.GTX1080Ti.11264.170503_3.rom'/>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x43' slot='0x00' function='0x1'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x06' function='0x0'/>
    </hostdev>
    <hostdev mode='subsystem' type='pci' managed='yes'>
      <driver name='vfio'/>
      <source>
        <address domain='0x0000' bus='0x41' slot='0x00' function='0x0'/>
      </source>
      <address type='pci' domain='0x0000' bus='0x00' slot='0x08' function='0x0'/>
    </hostdev>
    <memballoon model='none'/>
  </devices>
</domain>

I can't help on this specific situation, but I got passthrough working using the guide here: https://forums.unraid.net/topic/133563-gpu-passthrough-is-easy-heres-how/

 

I have a Win 11 VM and an nVidia GPU.