On Tuesday, 2 March 2021 11:41:52 PM AEDT Jason Gunthorpe wrote: > > However try_to_protect() scans the PTEs again under the PTL so checking the > > mapping of interest actually gets replaced during the rmap walk seems like a > > reasonable solution. Thanks for the comments. > > It does seem cleaner if you can manage it, the notifier will still be > needd to program the HW though Checking during the rmap walk wasn't hard but ultimately pointless. As you say a range notifier and lock is required to program the hardware, which requires checking the mappings with a mmu notifier sequence anyway. - Alistair
