On 2011-08-02 12:28, Rafał Miłecki wrote:
2011/8/2 Alan Cox<alan@xxxxxxxxxxxxxxxxxxx>:
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.
Not always. It's a bit more complicated than that. Some hardware supports
write only memory spaces, some hardware supports contexts in the GTT). On
other cards you need some kind of security model and verifier to handle
this. I don't think reloading the GTT is enough on most of the cards
because the display scanout for all the framebuffers is needed all the
time.
I believe you respond to Klaus Kusche here?
Klaus: please, CC mailing list so everyone can see your messages.
My mail Alan cited above was CC'd to the list.
No idea where it got eaten.
Is there some spam filter filtering list postings?
--
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
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