On Wed, Aug 12, 2020 at 01:54:04PM -0700, Jim Gill wrote: > Use coherent memory instead of dma mapping sg lists each > time they are used. This becomes important with SEV/swiotlb where > dma mapping otherwise implies bouncing of the data. It also gets rid > of a point of potential failure. > > Tested using a "bonnie++" run on an 8GB pvscsi disk on a swiotlb=force > booted kernel. This is the wrong way around. allocations from the coherent pool put the system under a pointless constrained on architectures that aren't dma coherent. Please don't do that.
