GPU passthrough on Arch: a Windows 11 VM with Looking Glass

Why bother

Sometimes you need Windows for one workload but refuse to give up Arch as the daily driver. KVM/QEMU with full NVIDIA GPU passthrough gets you a Windows 11 VM at near-native performance.

The hard parts

• Getting clean IOMMU groups so the GPU can be isolated and bound to vfio-pci.
• Looking Glass for sharing the framebuffer to the host with low latency — no second monitor.
• Documenting every step so the whole stack is reproducible on the next rebuild.