On Mon, 2018-08-06 at 23:27 -0700, Christoph Hellwig wrote: > On Tue, Aug 07, 2018 at 08:13:56AM +1000, Benjamin Herrenschmidt wrote: > > It would be indeed ideal if all we had to do was setup some kind of > > bus_dma_mask on all PCI devices and have virtio automagically insert > > swiotlb when necessary. > > For 4.20 I plan to remove the swiotlb ops and instead do the bounce > buffering in the common code, including a direct call to the direct > ops to avoid retpoline overhead. For that you still need a flag > in virtio that instead of blindly working physical addresses it needs > to be treated like a real device in terms of DMA. But you will still call the swiotlb infrastructure, right ? IE, I sitll need to control where/how the swiotlb "pool" is allocated. > > And for powerpc to make use of that I need to get the dma series I > posted last week reviewed and included, otherwise powerpc will have > to be excepted (like arm, where rmk didn't like the way the code > was factored, everything else has already been taken care of). > > https://lists.linuxfoundation.org/pipermail/iommu/2018-July/028989.html Yes, I saw your series. I'm just back from a week of travel, I plan to start reviewing it this week if Michael doesn't beat me to it. Cheers, Ben. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
