[Spice-devel] qxl and page flip

[Gerd Hoffmann]

  Hi,

> Switching the qxl kms driver to use a scratchpad model too should be
> easy for userspace apps not using qxl ioctls (i.e. basically
> everything
> but xorg-x11-drv-qxl).  Just use the vga memory region (start of pci
> bar 0) as scratchpad, then we can safely use framebuffer blits for
> display updates.  The tricky part here is to not break xorg-x11-drv-
> qxl.

Looks workable.  On a quick glance it seems to be as simple as handling
dumb buffers in a different way, because xorg-x11-drv-qxl doesn't use
dumb buffers but allocates objects using qxl ioctls instead.

I'll go investigate more next week.

cheers,
  Gerd