On Sun, Apr 23, 2023 at 08:45:20AM +0200, Greg KH wrote: > On Sun, Apr 23, 2023 at 02:25:45PM +0800, Xuan Zhuo wrote: > > The purpose of this patch is to allow driver pass the own dma callbacks > > to xsk. > > > > This is to cope with the scene of virtio-net. If virtio does not have > > VIRTIO_F_ACCESS_PLATFORM, then virtio cannot use DMA API. In this case, > > xsk cannot use DMA API directly to achieve DMA address. Based on this > > scene, we must let xsk support driver to use the driver's dma callbacks. > > Why does virtio need to use dma? That seems to go against the overall > goal of virtio's new security restrictions that are being proposed > (where they do NOT want it to use dma as it is not secure). Yes, they exactly use dma, specifically dma into bounce buffer.
