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

Michel Dänzer michel at daenzer.net
Tue Aug 2 08:27:36 PDT 2011

On Die, 2011-08-02 at 13:10 +0200, Prof. Dr. Klaus Kusche wrote: 
> On 2011-08-02 12:28, Rafał Miłecki wrote:
> > 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.
> 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?

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Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer

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