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20 changes: 18 additions & 2 deletions azure-stack/hci/manage/attach-gpu-to-linux-vm.md
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Expand Up @@ -28,11 +28,27 @@ This document assumes you have the Azure Stack HCI cluster deployed and VMs inst

:::image type="content" source="media/attach-gpu-to-linux-vm/pciroot.png" alt-text="Location Path Screenshot." lightbox="media/attach-gpu-to-linux-vm/pciroot.png":::

7. Open Windows PowerShell with elevated privileges and execute the `Dismount-VMHostAssignableDevice` cmdlet to dismount the GPU device for DDA to VM. Replace the *LocationPath* value with the value for your device obtained in step 6.
7. Core OS doesnt have MMC components and hence opening device manager is not possible, use command line to obtain the location information as explained below.
```PowerShell
#Get the instance ID for NVIDIA Device from the list of devices printed using the command below.
pnputil /enum-devices /class display

#Use the Instance ID as shown in the example command below:-
pnputil /enum-devices /instanceid "PCI\VEN_10DE&DEV_1CBA&SUBSYS_225F17AA&REV_A1\4&357120c5&0&0008" /properties | findstr -i pciroot

#Alternatively, if you do not wish to filter for this string, remove the | findstr -i pciroot to print all propertie.
pnputil /enum-devices /instanceid "PCI\VEN_10DE&DEV_1CBA&SUBSYS_225F17AA&REV_A1\4&357120c5&0&0008" /properties

#LocationPaths can be found under one of the sections shown in example excerpt below.
DEVPKEY_Device_LocationPaths [String List]:
PCIROOT(0)#PCI(0100)#PCI(0000)
ACPI(_SB_)#ACPI(PCI0)#ACPI(PEG0)#ACPI(PEGP)
```
8. Open Windows PowerShell with elevated privileges and execute the `Dismount-VMHostAssignableDevice` cmdlet to dismount the GPU device for DDA to VM. Replace the *LocationPath* value with the value for your device obtained in step 6.
```PowerShell
Dismount-VMHostAssignableDevice -LocationPath "PCIROOT(16)#PCI(0000)#PCI(0000)" -force
```
8. Confirm the device is listed under system devices in **Device Manager** as Dismounted.
9. Confirm the device is listed under system devices in **Device Manager** as Dismounted.

:::image type="content" source="media/attach-gpu-to-linux-vm/dismounted.png" alt-text="Dismounted Device Screenshot." lightbox="media/attach-gpu-to-linux-vm/dismounted.png":::

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