On Mon, Sep 30, 2013 at 08:21:12PM +0200, Andi Kleen wrote: > > Nvidia is now also going to use mmu notifier to allow the GPU (acting > > as a secondary MMU with pagetables) to access main memory without > > That's a good point. iirc AMD GPUs are also going into > the same direction, and likely more. So we probably need > to support that usage. > > Too bad :-/ > > -Andi
In all fairness, current AMD solution is hardware only, you can see the code in drivers/iommu/amd_iommu_v2.c but they might be interested in the software solution for added features like abilities to move process memory to video memory and migrating it back when CPU access it. Others too might be interested (Intel, infiniband, or any driver with an mmu that can do pagefault and has couple others features). Cheers, Jerome -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/