On Wed, May 20, 2015 at 03:09:43PM +0100, Chris Wilson wrote: > On Wed, May 20, 2015 at 04:54:19PM +0300, David Weinehall wrote: > > This patch series (one patch each for libdrm, the kernel, and beignet) > > aims to provide a means to add a context-specific means to prevent > > a mapping to GPU virtual address zero. This is needed at least by > > Beignet (possibly in other use-cases too, though I don't know of any > > other) to allow use of address zero to represent NULL. > > Urm, you cannot allow absolute addressing period. What happens to the > object at 0 when the user reads from it or writes to it? You have to > have an object at 0 for the user's NULL pointer access. I'll mollify that: outside of full-ppgtt where you need to share the VM. -Chris -- Chris Wilson, Intel Open Source Technology Centre _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/intel-gfx
