[Feature request] Multiple X servers on one graphics card?

[Rafał Miłecki]

2011/8/2 Alan Cox <alan at lxorguk.ukuu.org.uk>:
>> 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.

-- 
Rafał