A set of 19 patches published a short time ago provide support for "guest back surfaces" within the VMware SVGA Gallium3D driver that is used by the company's virtual machine clients.
Already recently we have seen massive VMware open-source driver changes
in accomodating the virtual GPU driver used by VMware VMs, but now Brian Paul -- the original creator of Mesa that was part of Tungsten Graphics and now part of VMware -- has sent out a big set of patches for updating the driver. The set of 19 patches to the SVGA driver provide support for guest-backed surfaces and other updates. The patches can be found on the Mesa-dev mailing list