Well this is quite exciting. Collabora, the open source consulting firm that often works with Valve, has announced the experimental Venus driver for 3D acceleration of Vulkan applications in QEMU. For those not familiar, QEMU is a generic and open source machine emulator and virtualizer.
"Running graphics applications in a Guest OS can be annoying as they are generally greedy of computing resources, and that can slow you down or give you a bad experience in terms of graphics performance. Being able to accelerate all this by offloading the workload to the hardware can be a great deal. The VirtIO-GPU virtual GPU device comes into play here, allowing a Guest OS to send graphics commands to it through OpenGL or Vulkan. While we are already there with OpenGL, we can not say the same for Vulkan. Well, until now."
The work has not been upstreamed yet but it's looking quite promising, Collabora mention that there's still plenty of work to be done yet before that happens. You can see a preview video of it running below:
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a full gpu passthrough lets the guest OS take over full control of the specific hardware, so you need a second GPU hardware just for the windows guest... not ideal with current prices, to say the least, LOL (unless you have a spare one already)
there was work towards a gpu passthrough method where both host and guest could share the same hardware, but i'm not sure how that was meant to work and at what stage that work is now
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