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 Klaus.Kusche@xxxxxxxxxxxxxxx http://www.computerix.info Office address: NTA Isny gGmbH, Seidenstraße 12-35, 88316 Isny, Germany +49 7562 9707 36 kusche@xxxxxxxxxxx http://www.nta-isny.de _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
