On 2011-08-01 22:22, Alan Cox wrote:
There are also some interesting security issues with a lot of GPUs where
you'd be very very hard pushed to stop one task spying on the display of
another as there isn't much in the way of MMU contexts on the GPU side.
Alan
But I believe this is a problem of all approaches which provide
multiple hardware-accelerated (or Xv-enabled) seats on a single GPU,
no matter if based on multiple DRM devices, on Xephyr or Xnest
with some kind of OpenGL or DRI passthrough, or on Wayland:
If one has direct access to the graphics engine, he also can access
any video memory he wants.
Hence, that's no argument against multiple DRM devices on a single card,
because the other solutions suffer from the same problem.
In the long term, it needs to be fixed,
but in a classroom environment, that's not my primary concern
(and I believe 90 % of all multiseat installations
will be classroom or home environments).
Klaus.
--
Prof. Dr. Klaus Kusche
Private address: Rainstraße 9/1, 88316 Isny, Germany
+49 7562 6211377 [email protected] http://www.computerix.info
Office address: NTA Isny gGmbH, Seidenstraße 12-35, 88316 Isny, Germany
+49 7562 9707 36 [email protected] http://www.nta-isny.de
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