On Tue, 20 Apr 2021 at 21:59, Peter Xu <pet...@redhat.com> wrote: > I think it should always be a valid request to trigger memory access via the > MR > layer, say, what if the caller has no address space context at all? From the > name of memory_region_dispatch_write|read I don't see either on why we should > not take care of alias mrs. That's also the reason I'd even prefer this patch > rather than an assert.
It's a bit of an odd case to need to do direct accesses on an MR (so if you think you need to you should probably look for whether there's a better way to do it), but there are sometimes reasons it's necessary or expedient -- we have about half a dozen uses which aren't part of the core memory system using memory_region_dispatch_* as an internal function. So I think I agree that while we have this as an API exposed to the rest of the system it would be nice if it Just Worked for alias MRs. thanks -- PMM
