On Thu, Oct 17, 2024 at 12:58:48PM +1100, Alistair Popple wrote: > Actually I think the rule should be don't look at the page at > all. hmm_range_fault() is about mirroring PTEs, no assumption should > even be made about the existence or otherwise of a struct page. We are not there yet.. > > We don't need to enforce, it we don't know what else the driver will > > want to use that P2P page for after all. It might stick it in a VMA > > for some unrelated reason. > > And wouldn't that touch the refcount and therefore be wrong? I mean the originating driver would do that Jason
