On Fri, Apr 17, 2020 at 12:09:38PM +0200, David Hildenbrand wrote: > > What do you call "hinting ends" though? The fact we put > > a page in the VQ is not a guarantee that it's been consumed > > by the hypervisor. > > > > I'd say hinting ends once the hypervisor sets FREE_PAGE_REPORT_S_DONE. Can't find that one anywhere. what did I miss? > > > > I think a strict definition is this: > > - hint includes a command ID > > - hint implies "page was unused at some point after guest reading command ID" > > > > > > Hypervisor can use dirty tracking tricks to get from that to > > "page is unused at the moment". > > > >> Whereby X is > >> currently assumed to be 0, correct? > > > > > > > > Now we are talking about what's safe to do with the page. > > > > If POISON flag is set by hypervisor but clear by guest, > > or poison_val is 0, then it's clear it's safe to blow > > away the page if we can figure out it's unused. > > > > Otherwise, it's much less clear :) > > Hah! Agreed :D > > > > > > > > > I'll have to come back and re-read the rest next week, this > > is complex stuff and I'm too rushed with other things today. > > Yeah, I'm also loaded with other stuff. Maybe Alex has time to > understand the details as well. > > -- > Thanks, > > David / dhildenb _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
