On Sat, Feb 22, 2020 at 02:07:58PM -0500, Michael S. Tsirkin wrote: > On Fri, Feb 21, 2020 at 03:33:40PM +0100, Halil Pasic wrote: > > AFAIU you have a positive attitude towards the idea, that > > !F_VIRTIO_PLATFORM implies 'no DMA API is used by virtio' > > should be scrapped. > > > > I would like to accomplish that without adverse effects to virtio-ccw > > (because caring for virtio-ccw is a part of job description). > > > > Regards, > > Halil > > It is possible, in theory. IIRC the main challenge is that DMA API > has overhead of indirect function calls even when all it > does it return back the PA without changes. That overhead is gone now, the DMA direct calls are direct calls these days.
