Windows 10 disables support for RemoteFX vGPU; Can you re-enable it?

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Microsoft has released a security update—KB4571756—which will disable the RemoteFX vGPU feature because of a security vulnerability. Information technology applies to Windows 10, version 2004, and all editions Windows Server version 2004.

Postal service this update, any VM that has RemoteFX vGPU enabled will neglect with the following error messages:

The virtual machine cannot be started because all the RemoteFX-capable GPUs are disabled in Hyper-V Manager.
The virtual machine cannot be started because the server has bereft GPU resources.

Fifty-fifty if the end-user tries to re-enable the RemoteFX vGPU, the VM will display the error message—

We no longer support the RemoteFX 3D video adapter. If you are still using this adapter, yous may become vulnerable to security hazard.

What is the RemoteFX vGPU feature?

When running Virtual Machines, the RemoteFX vGPU feature lets you lot share the concrete GPU. The feature fits well when concrete GPU is likewise much of a resource, but instead, all VMs can dynamically share the GPU for their workload. The reward is, of course, the reduction in the cost of GPU and decreasing CPU load. If you want to imagine, it is like running multiple DirectX applications at the same time on the same physical GPU. And so instead of buying iv GPUs, one GPU could aid, depending on the workload. It also came with countermeasures that restricted the overuse of physical GPU.

What is the security vulnerability around RemoteFX vGPU?

RemoteFX vGPU is old. It was introduced in Windows seven and is now facing a remote code execution vulnerability. A remote code execution vulnerability exists when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system. It happens when Hyper-V RemoteFX vGPU on a host server fails to properly validate input from an authenticated user on a guest operating system when an attacker runs a crafted application on a guest Os, which attacks individual third-party video drivers running on the Hyper-V host.

One time the assaulter has access, he can run any lawmaking on the host Os. Since this is an architectural issue, there is no fix for it.

Alternatives to RemoteFX vGPU

The but pick is to employ an alternate vGPU, which could be from third-party applications or Microsoft suggests using Discrete Device Assignment (DDA). It allows yous to entire PCIe Device into a VM. Non only tin can yous allow access to Graphics cars, but y'all tin can as well share NVMe storage.

The biggest advantage of DDA apart from that it'south secure, there is no need to install drivers on the host before the device being mounted within the VM. As long as VM can identify the device's PCIe Location, the Path can be adamant for the VM to mountain it. In short, DDA passing a GPU to a VM allows the native GPU driver to be used within the VM and all capabilities. That includes DirectX 12, CUDA, etc., which was not possible with RemoteFX vGPU.

How to re-enable RemoteFX vGPU

Microsoft clearly warns that y'all should not exist using the RemoteFX vGPU, but if you have to, there is a way to enable it once more at your ain risk.

Assuming you have already configured the RemoteFX vGPU 3D adapter, here are the details that volition work but on Windows x, version 1803, and earlier versions

Configure RemoteFX vGPU with Hyper-Five Manager

To configure the RemoteFX vGPU 3D by using Hyper-V Manager, follow these steps:

Stop the Virtual Automobile
Open Hyper-Five Director and navigate to VM Settings.
Click on Add Hardware.
Select RemoteFX 3D Graphics Adapter, and then select Add.

Configure RemoteFX vGPU with PowerShell cmdlets

Enable-VMRemoteFXPhysicalVideoAdapter
Add together-VMRemoteFx3dVideoAdapter
Get-VMRemoteFx3dVideoAdapter
Set-VMRemoteFx3dVideoAdapter
Get-VMRemoteFXPhysicalVideoAdapter

You can read more about it here on Microsoft.

Ashish is a veteran Windows, and Xbox user who excels in writing tips, tricks, and features on it to improve your day to solar day experience with your devices.