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: Rainstra?e 9/1, 88316 Isny, Germany +49 7562 6211377 Klaus.Kusche at computerix.info http://www.computerix.info Office address: NTA Isny gGmbH, Seidenstra?e 12-35, 88316 Isny, Germany +49 7562 9707 36 kusche at nta-isny.de http://www.nta-isny.de
