Yes, Intel iGPU passthrough to macOS KVM is feasible.
Yes, Intel iGPU passthrough to macOS KVM is feasible.
I noticed the video showing a working MacOS with Intel CPU and AMD GPU. I understand that NVIDIA GPUs aren't supported. If you have an NVIDIA GPU but no AMD one, it's possible to route through the Intel Integrated Graphics (IGPU). You’d need to configure your system settings or use a virtualization method to pass through the Intel IGP instead.
I have a tutorial on how to perform GPU pass-through on Ubuntu using QEMU/KVM. In theory passing through an iGPU is possible. My expectation is that internal to the CPU it is a PCIe device. That's what I'd expect. What's important is that it appear alone in its own IOMMU group. If it's bunched up with a wad of other devices it's either not possible or much harder to do (breaking apart IOMMU groups). If it doesn't show up as a PCIe device it may not be possible at all. Although you can pass through devices that aren't connected directly to PCIe so the possibility is still there.