IOMMU GPU passthrough with device selection would be a helpful feature: https://www.google.com/search?q=gpu+passthrough+qemu

LXD manages qemu VMs and supports snapshotting, live migration, and a number of storage drivers: https://news.ycombinator.com/item?id=45270468

virtio-gpu-rutabaga works with Android VMs on qemu, but does it work with Win/Mac/Lin: https://news.ycombinator.com/item?id=42921315