Excerpts from Paolo Bonzini's message of June 24, 2021 7:42 pm: > On 24/06/21 10:52, Nicholas Piggin wrote: >>> For now, wrap all calls to gfn_to_pfn functions in the new helper >>> function. Callers which don't need the page struct will be updated in >>> follow-up patches. >> Hmm. You mean callers that do need the page will be updated? Normally >> if there will be leftover users that don't need the struct page then >> you would go the other way and keep the old call the same, and add a new >> one (gfn_to_pfn_page) just for those that need it. > > Needing kvm_pfn_page_unwrap is a sign that something might be buggy, so > it's a good idea to move the short name to the common case and the ugly > kvm_pfn_page_unwrap(gfn_to_pfn(...)) for the weird one. In fact I'm not > sure there should be any kvm_pfn_page_unwrap in the end. If all callers were updated that is one thing, but from the changelog it sounds like that would not happen and there would be some gfn_to_pfn users left over. But yes in the end you would either need to make gfn_to_pfn never return a page found via follow_pte, or change all callers to the new way. If the plan is for the latter then I guess that's fine. Thanks, Nick
