VirtIO-GPU 3D

This is virtual GPU device which is used by hypervisors like QEMU/KVM & this is used by Virtual machines running on Windows host.
This stack enables virtual machines to access accelerated 3D graphics by providing a paravirtualized GPU rather than exposing the host's physical GPU directly.

How it works?

VirtIO-GPU presents a virtual graphics card to the guest OS
For 3D acceleration, openGL running on Hardware communicates with VirGL running on VirtIO-GPU 3D.

Does Windows Support it?
VirGL is available for Linux guests, but projects and experimental drivers exist for Windows guests, still evolving and not as robust or performant as Linux solutions.

Is VirtIO-GPU 3D a direct pass-through?
No, only virtual GPU
For direct and full performance GPU access, hypervisors use methods like VFIO (direct passthrough) or SR-IOV (partitioned physical GPU into virtual functions),

Practical Implementations

1. Oracle VirtualBox's provides 1 GPU to all guest VMs

2. OpenGL.dll interceptor

What is openGL?
Now Application(inside guest virtual machine) will call openGL APIs which would be intercepted and redirected to the host OS or a virtual GPU backend