On Wed, 2012-01-11 at 08:47 +0000, Stefan Hajnoczi wrote: > > This is also an opportunity to stop using CPU physical addresses in > the ring and instead perform DMA like a normal PCI device (use bus > addresses). Euh why ? That would mean in many cases adding a layer of iommu, which will slow things down a lot ... unless we create a special virtio bus which has its own dma-ops that do a direct v:p translation that is. But anything PCI doing dma_map_sg and co will involved emulated iommu mapping & unmapping and will be a huge hit on performances. Cheers, Ben. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
