> From: Joao Martins <joao.m.martins@xxxxxxxxxx> > Sent: Friday, April 29, 2022 5:09 AM > > Similar to .read_and_clear_dirty() use the page table > walker helper functions and set DBM|RDONLY bit, thus > switching the IOPTE to writeable-clean. this should not be one-off if the operation needs to be applied to IOPTE. Say a map request comes right after set_dirty_tracking() is called. If it's agreed to remove the range op then smmu driver should record the tracking status internally and then apply the modifier to all the new mappings automatically before dirty tracking is disabled. Otherwise the same logic needs to be kept in iommufd to call set_dirty_tracking_range() explicitly for every new iopt_area created within the tracking window. Thanks Kevin
