[Intel-gfx] [PATCH] drm/i915: Remove secure batch buffer flag SNB+

[Ben Widawsky]

On Oct 5, 2011, at 2:26 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote:

> On Wed,  5 Oct 2011 13:01:56 -0700, Ben Widawsky <ben at bwidawsk.net> wrote:
>> Docs say that the secure batchbuffer field for > SNB B0 (products that
>> actually shipped) should be 0 when not using PPGTT. I'd guess this has
>> no positive or negative effect, but is just here to jive with the docs.
> 
> How explicit is the warning? Enough to allow arbitrary writes into the
> MMIO space?
> -Chris
> 
the windows driver does this from what we hear. not sure if that's good or bad though.