On Thu, Feb 22, 2024 at 03:29:10PM -0500, Michael S. Tsirkin wrote: > In a sense ... but on the other hand, the "fake DMA" metaphor seems to > work surprisingly well, like in this instance - internal bounce buffer > looks a bit like non-coherent DMA. A way to make this all prettier > would I guess be to actually wrap all of DMA with virtio wrappers which > would all go if () dma_... else vduse_...; or something to this end. A > lot of work for sure, and is it really worth it? if the only crazy > driver is vduse I'd maybe rather keep the crazy hacks local there ...
Well, vduse is the only driver that does this hack - we had a few more and we got rid of it. It basically is the only thing preventing us from doing direct calls into the iommu code and compile out dma_ops entirely for non-Xen builds on the common architectures. So yes, I'd really like to see it gone rather sooner than later.
