Keir Fraser wrote:
You'd need to track pte->grant_handle mappings somewhere, but it could certainly be done this way, yes.
At the moment, blktap and gntdev provide struct pages to get_user_pages by smuggling them in the vm_private_data field of the relevant vm_area_struct. Could we use this field to get the handles to ptep_get_and_clear_full as well?
Only downside that I can see is that we would need to find the vma for each PTE that needs to be cleared this way (since we don't get this passed to ptep_get_and_clear_full), but this is mitigated by (i) it only happening in the erroneous, unclean-shutdown case, and (ii) getting a hit in the mm->mmap_cache for consecutive runs of mapped grants.
Regards, Derek. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
