[rfc] VIA dri and security.

[Alan Cox]

On Maw, 2004-10-12 at 01:14, Dave Airlie wrote:
> application so it could modify them after validation if it was sufficently
> sneaky enough... for the mach64 the idea was to allocate a pool of private
> buffers using pci interfaces and use those to pass command streams after
> verification.. the user app wouldn't be able to map these...

Unless the data set is very large this is the right answer - just copy
them. You can revoke pages but that is messy and involves cross CPU
calls so sucks on SMP or HT machines.