Hi! With our SVM mirror work we'll soon start looking at HMM cross-device support. The identified needs are 1) Instead of migrating foreign device memory to system when the current device is faulting, leave it in place... 1a) for access using internal interconnect, 1b) for access using PCIE p2p (probably mostly as a reference) 2) Request a foreign device to migrate memory range a..b of a CPU mm_struct to local shareable device memory on that foreign device. and we plan to add an infrastructure for this. Probably this can be done initially without too much (or any) changes to the hmm code itself. So the question is basically whether anybody is interested in a drm-wide solution for this and in that case also whether anybody sees the need for cross-driver support? Otherwise any objections against us starting out with an xe driver helper implementation that could be lifted to drm-level when needed? Finally any suggestions or pointers to existing solutions for this? Any comments / suggestions greatly appreciated. Thanks, Thomas
