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Pool becomes > > frozen, can't add/remove PFNs. > > Doesn't that circumvent LUO's state machine? The idea with the state > machine was to have clear points in time when the system goes into the > "limited capacity"/"frozen" state, which is the LIVEUPDATE_PREPARE > event. I wouldn't get too invested in the FSM, it is there but it doesn't mean every luo client has to be focused on it. > With what you propose, the first FD being preserved implicitly > triggers the prepare event. Same thing for unprepare/cancel operations. Yes, this is easy to write and simple to manage. > I am wondering if it is better to do it the other way round: prepare all > files first, and then prepare the hugetlb subsystem at > LIVEUPDATE_PREPARE event. At that point it already knows which pages to > mark preserved so the serialization can be done in one go. I think this would be slower and more complex? > > 2) Require the users of hugetlb memory, like memfd, to > > preserve/restore the folios they are using (using their hugetlb order) > > 3) Just before kexec run over the PFN list and mark a bit if the folio > > was preserved by KHO or not. Make sure everything gets KHO > > preserved. > > "just before kexec" would need a callback from LUO. I suppose a > subsystem is the place for that callback. I wrote my email under the > (wrong) impression that we were replacing subsystems. The file descriptors path should have luo client ops that have all the required callbacks. This is probably an existing op. > That makes me wonder: how is the subsystem-level callback supposed to > access the global data? I suppose it can use the liveupdate_file_handler > directly, but it is kind of strange since technically the subsystem and > file handler are two different entities. If we need such things we would need a way to link these together, but I'm wonder if we really don't.. > Also as Pasha mentioned, 1G pages for guest_memfd will use hugetlb, and > I'm not sure how that would map with this shared global data. memfd and > guest_memfd will likely have different liveupdate_file_handler but would > share data from the same subsystem. Maybe that's a problem to solve for > later... On preserve memfd should call into hugetlb to activate it as a hugetlb page provider and preserve it too. Jason