To clarify it's the functionality which is provided using the dxgkrnl(which has both Linux kernel and WSL2/Hyper-V hypervisor components that are required to fu

To clarify it's the functionality which is provided using the dxgkrnl(which has both Linux kernel and WSL2/Hyper-V hypervisor components that are required to function) passthrough that makes the "Extend" functionality not work in a normal Linux VM with say a KVM based hypervisor. The issue is that the WSL2 Linux userspace(which is basically a port of a number of windows userspace components to WSL2 Linux) has closed source libraries like libd3d12.so and libdirectml.so which have a hard requirement on dxgkrnl and a Hyper-V hypervisor/Windows based VM host. If Linux applications are developed targeting these closed source libraries they will not function on normal non-WSL2/Hyper-V VM's. See the diagrams/details here: https://devblogs.microsoft.com/directx/directx-heart-linux/ https://devblogs.microsoft.com/directx/directx-heart-linux/ > Over the last few Windows releases, we have been busy developing client GPU virtualization technology. This technology is integrated into WDDM (Windows Display Driver Model) and all WDDMv2.5 or later drivers have native support for GPU virtualization. This technology is referred to as WDDM GPU Paravirtualization, or GPU-PV for short. GPU-PV is now a foundational part of Windows and is used in scenarios like Windows Defender Application Guard, the Windows Sandbox or the Hololens 2 emulator. Today this technology is limited to Windows guests, i.e. Windows running inside of a VM or container. > To bring support for GPU acceleration to WSL 2, WDDMv2.9 will expand the reach of GPU-PV to Linux guests. This is achieved through a new Linux kernel driver that leverages the GPU-PV protocol to expose a GPU to user mode Linux. The projected abstraction of the GPU follows closely the WDDM GPU abstraction model, allowing API and drivers built against that abstraction to be easily ported for use in a Linux environment. > Projecting a WDDM compatible abstraction for the GPU inside of Linux allowed us to recompile and bring our premiere graphics API to Linux when running in WSL. > This is the real and full D3D12 API, no imitations, pretender or reimplementation here… this is the real deal. libd3d12.so is compiled from the same source code as d3d12.dll on Windows but for a Linux target.