On Thu, Dec 01, 2022 at 09:38:10AM -0600, Bob Pearson wrote: > Further, looking at ipoib as an example, it builds sge lists using the lkey from get_dma_mr() > and sets the sge->addr to a kernel virtual memory address after previously calling > ib_dma_map_single() so the addresses are mapped for dma access and visible before use. > They are unmapped after the read/write operation completes. What is the point of kmapping > the address after dma mapping them? Because not everything is ipoib, and things like block will map sgls with struct pages, not kva. Jason
