anchor.diff:                (return-from virtio::virtio-gpu-register nil)))
             (setf (virtio-gpu-scanout gpu) pmode
                   (virtio-gpu-width gpu) width
  -                (virtio-gpu-height gpu) height)
  +                (virtio-gpu-height gpu) height
  +                (virtio-gpu-framebuffer gpu) framebuffer-dma-buffer)
             (sup::video-set-framebuffer framebuffer-phys width height
                                         (* width 4) :x8r8g8b8
                                         :damage-fn
  
positive.code:            #:virtio-gpu-scanout
             #:virtio-gpu-width
             #:virtio-gpu-height
             #:virtio-gpu-virgl-p
             #:virtio-gpu-virgl-data
  
  
negative.code:   scanout
    width
    height
    framebuffer
    virgl-p
    virgl-data)
  
  