Using Metal, IOSurface and Virtualization.framework

For a 3D workload going through Virtualization.framework's graphics device, what's the supported/expected path for the guest to drive host-side Metal rendering, and what are the known performance sharp edges?

Is zero-copy IOSurface sharing between host and guest a sanctioned pattern? What are the best practices and limits for high-throughput texture handoff across the VM boundary?

We translate a foreign 3D command stream into Metal on the host. Any guidance on command-buffer batching, synchronization, or present/vsync alignment to keep latency low?