[vfio-users] Framebuffer intercept: is it possible?

[Blank Field]

Just as i've been thinking.
So yeah, map the device memory and find the frame buffer in it.
On Sep 15, 2015 6:13 PM, "Alex Williamson" <alex.williamson at redhat.com>
wrote:

> On Tue, 2015-09-15 at 13:20 +0200, Leonhard Preis wrote:
> > Hi!
> >
> > Since the card outputs the signal directly to the monitor, never passing
> > through the domain of the host that is very unlikely. Only thing I could
> > imagine is that you could find a way to access the cards memory and grab
> > something there but that’s not the same thing, right?
>
> Yes, this is how you'd need to do it and it is theoretically possible.
> A privileged user in the host could mmap device memory and read from it
> (writing is most likely a very bad idea).  I don't know enough about the
> internal operation of a graphics card, but I assume the framebuffer
> would be accessible or could be pieced together if the user had
> sufficient knowledge of the programming model of the card.
>
> > Am 15.09.2015, 10:01 Uhr, schrieb francesco dicarlo
> > <evilsephiroth at gmail.com>:
> >
> > > Reallly interested in this. It would be a good way to analyse also
> > > performance.
> > >
> > > 2015-09-15 9:09 GMT+02:00 Blank Field <ihatethisfield at gmail.com>:
> > >>
> > >> Is it theoretically possible to capture the video output of the VM's
> > >> p-t'd GPU using some host facilities?
> > >> It would be extra awesome to be able to capture exactly what you see
> on
> > >> the screen, like any stuttering, corruption, directX shaders and
> > >> accelerated video playback.
> > >>
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> >
> >
> >
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