Hyper-V | Assign Graphics Card to Virtual Machine

# Configure the VM for a Discrete Device Assignment
$VM = "WR-CLI-VM-MPS"

# Define the output file path
$OutputFile = "C:\TEMP\discete-device-assignment-mount.txt"

# Set automatic stop action to TurnOff
Set-VM -Name $VM -AutomaticStopAction TurnOff | Out-File -FilePath $OutputFile -Append

# Enable Write-Combining on the CPU
Set-VM -GuestControlledCacheTypes $True -VMName $VM | Out-File -FilePath $OutputFile -Append

# Configure 32-bit MMIO space
Set-VM -LowMemoryMappedIoSpace 3GB -VMName $VM | Out-File -FilePath $OutputFile -Append

# Configure Greater than 32-bit MMIO space
Set-VM -HighMemoryMappedIoSpace 33280MB -VMName $VM | Out-File -FilePath $OutputFile -Append

# Find the Location Path and disable the Device
# Enumerate all PnP Devices on the system
$PnPDevs = Get-PnpDevice -PresentOnly

# Select only those devices that are Display devices manufactured by NVIDIA
$GPUDevs = $PnPDevs | Where-Object { $_.Class -Like "Display" -and $_.Manufacturer -Like "NVIDIA" }

# Select the location path of the first device that's available to be dismounted by the host
$LocationPath = ($GPUDevs | Get-PnpDeviceProperty -KeyName 'DEVPKEY_Device_LocationPaths').Data[0]

# Disable the PnP Device
Disable-PnpDevice -InstanceId $GPUDevs[0].InstanceId -Confirm:$False | Out-File -FilePath $OutputFile -Append

# Dismount the Device from the Host
Dismount-VMHostAssignableDevice -Force -LocationPath $LocationPath | Out-File -FilePath $OutputFile -Append

# Assign the device to the guest VM
Add-VMAssignableDevice -LocationPath $LocationPath -VMName $VM | Out-File -FilePath $OutputFile -Append

# Output the location path of the dismounted device to the console and the file
$LocationOutput = "The dismounted device location path is: $LocationPath"
Write-Output $LocationOutput | Tee-Object -FilePath $OutputFile -Append

# Find the Location Path and disable the Device
# Enumerate all PnP Devices on the system
$PnPDevs = Get-PnpDevice

# Select only those devices that are Display devices manufactured by NVIDIA
$GPUDevs = $PnPDevs | Where-Object { $_.Class -Like "Display" -And $_.Manufacturer -Like "NVIDIA" }

# Select the location path of the first device that's available to be dismounted by the host
$LocationPath = ($GPUDevs | Get-PnpDeviceProperty -KeyName 'DEVPKEY_Device_LocationPaths').Data[0]

# Remove the device from the VM
Remove-VMAssignableDevice -LocationPath $LocationPath -VMName "WR-CLI-VM-MPS"

# Mount the device back in the host
Mount-VMHostAssignableDevice -LocationPath $LocationPath

# Enable the PnP Device
Enable-PnpDevice -InstanceId $GPUDevs[0].InstanceId -Confirm:$False