On Mon, Jul 10, 2023 at 11:42:30AM +0800, Xuan Zhuo wrote: > This helper allows the driver change the dma mode to premapped mode. > Under the premapped mode, the virtio core do not do dma mapping > internally. > > This just work when the use_dma_api is true. If the use_dma_api is false, > the dma options is not through the DMA APIs, that is not the standard > way of the linux kernel. I have a hard time parsing this. More importantly having two modes seems very error prone going down the route. If the premapping is so important, why don't we do it always?
