WDDM version 2.9 works with a new Linux kernel driver (Dxgkrnl) that uses the GPU-PV protocol to provide user mode Linux access to GPUs. In WDDM version 2.9, Microsoft is adding GPU virtualization support for Linux VMs. But right now, GPU virtualization only works in Windows guest VMs. GPU virtualization is integrated into WDDM (Windows Display Driver Model) and is currently used for Windows Defender Application Guard, Windows Sandbox, and other apps. To enable GPU hardware acceleration in WSL 2, Microsoft is implementing GPU Paravirtualization (GPU-PV) for Linux virtual machine (VM) guests. Microsoft is now looking to address those shortcomings. Nevertheless, even with the improvements coming in WSL 2, the lack of support for GPU hardware acceleration and GUI apps limits its uses. WSL appears to be quite popular with developers that want to stay on Windows, with some able to run their entire DevOps workflows on the platform. WSL 2 uses a real Linux kernel to overcome the limitations of WSL 1, which is based on an emulation layer that maps Windows kernel system calls to Linux kernel system calls, allowing Linux binaries to run in Windows unmodified. First announced at Build 2019, Windows Subsystem for Linux (WSL) 2 will debut in the Windows Update.
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