uh, this doesn't look like what those gpu passthrough things like vfio do, is it a different thing? Or I am more interested in, can this do what vfio do, run games in almost native performance in windows guest vm?
> run games in almost native performance in windows guest vm?
No, vfio is still the most recommended option.
This is essentially something like VirtualBox or VMWare 3D acceleration - the host is still the "owner" of the GPU, and has to juggle receiving OpenGL commands from the guest and sending the render results back to it, with lots of overhead. But easier for users than setting up passthrough or using proprietary GPU virtualization solutions.
People pointed out that there is a similar project for Vulkan, already being used in production for ChromeOS, called Venus. Should be the one to watch nowadays.
Virgl just sends opengl commands to the host. And it also has to copy some buffers back and forth. So it won't be as fast as vfio. But, there is a new feature called VirtGPU DRM native contexts which eliminates some of this overhead and run at near native speeds. Unfortunately it's only implemented for adreno/msm GPUs for now.I think there is work on the way for Intel and AMD GPUs.
