[Intel-gfx] pin OABUFFER to GGTT

[Madajczak, Tomasz]

bo_pin had so far root privileges - they were sufficient and it would be
enough to get bo_pin back the same way. This also implies that root can only
start the OA buffer measurements.

-Tomasz

-----Original Message-----
From: Lespiau, Damien 
Sent: Wednesday, July 02, 2014 12:49 PM
To: Madajczak, Tomasz
Cc: Mateo Lozano, Oscar; Chris Wilson; Ben Widawsky;
Intel-gfx at lists.freedesktop.org
Subject: Re: [Intel-gfx] pin OABUFFER to GGTT

On Wed, Jul 02, 2014 at 10:31:45AM +0000, Madajczak, Tomasz wrote:
> There isn't any secret or privacy in that OA buffer data - just 
> results of performance counters, shown by tools such as GPA/ Vtune.

Chris alludes to the fact that if there's a way for one application to
gather data about other applications (whatever kind of data), that's an
automatic security concern.

One may think that's only very theoretical, but the side channel attacks are
(surpringly) real and effective. It cannot be proven easily that exposing
data about other contexes is totally secure.

There are ways around that however. If only root can gather that data, I
think we've contained the issue enough for the case at hand?

--
Damien
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