Introductioin
Intel GVT-g is a mediated passthrough so that the host and the guest VMs can share the intel iGPU without full device passthrough. This is a similar technology to NVIDIA’s vgpu which is only available for some high-end professional cards even through there is a software unlock for the consumer grade GPUs. There is also similar technology available for AMD’s GPUs.
If the full device passthrough is what you want, then you can check Intel GVT-d.