On Fri, May 26, 2023 at 1:47 PM Liang Chen <liangchen.linux@xxxxxxxxx> wrote: > > Currently, DMA operations of virtio devices' data buffer are encapsulated > within the underlying virtqueue implementation. DMA map/unmap operations > are performed for each data buffer attached to/detached from the virtqueue, > which is transparent and invisible to the higher-level virtio device > drivers. This encapsulation makes it not viable for device drivers to > introduce certain mechanisms, such as page pool, that require explicit > management of DMA map/unmap. Therefore, by inserting a pre-handler before > the generic DMA map/unmap operations, virtio device drivers have the > opportunity to participate in DMA operations. > > Signed-off-by: Liang Chen <liangchen.linux@xxxxxxxxx> So Xuan is doing AF_XDP for the virtio-net that allows the DMA to be mapped at least by the virtio-net. It looks like a way to allow virtio-net to map and unmap the DMA buffer by itself, but this patch goes into another way which seems to query the address from the virtio core. Personally, I think map and sync by the virtio-net driver seems clean. But we can see. Thanks _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
