This fix corrects tweaks to Windows 10 vm hostdev virtual addresses.

Much like myself, you may have ran into issues after following a nearly flawless guide like this: https://forums.serverbuilds.net/t/guide-remote-gaming-on-unraid/4248. In my case, no amount of bios updates, driver installs, or reboots would make my audio device appear in device manager. The third step below did: 
 

 

• Head over to Unraid's Tools > System Devices > find the IOMMU group assigned to your Intel Audio Controller > toggle on the entire group > Bind Selected VFIO at Boot

 

• Next head to VMs > Edit your VM:
  • make sure your gpu's audio is configured in the sound card drop down
  • click the add button to add a second audio device and pick your onboard audio controller
  • make sure to click update at the bottom

 

 

• Scroll all the way to the bottom of your VM XML to the first hostdev (in my case line 136 circled in red)

  • update the virtual slot and functions that have been underlined in red to match the physical slot and function above them

  • add multifunction='on' to the end of the virtual address (in my case line 139)

• Here's the solution I couldn't find documented elsewhere

  • in my case, on line 153 I added multifunction='on'

  • I did not update the function whatsoever

  • below this on my line 167...

  • bus/slot match the bus/slot on line 153, while funciton (167) matches funciton (165)

 

I just want to say thanks on this post. It works on my Gigabyte Mobo.

Got it to work after following this, except one thing I didn't realize at first is you also need to check the SPI controller under other PCI devices in order for the analog audio ports to show up. Works perfectly on my Aorus Pro AX Z490.