On Thu, Apr 05, 2018 at 08:09:26AM -0400, Pankaj Gupta wrote: >> Will this raw file already have the "disk information header" (no idea >> how that stuff is called) encoded? Are there any plans/possible ways to >> >> a) automatically create the headers? (if that's even possible) > > Its raw. Right now we are just supporting raw format. > > As this is direct mapping of memory into guest address space, I don't > think we can have an abstraction of headers for block specific features. > Or may be we can get opinion of others(Qemu block people) it is at all possible? memdev and the block layer are completely separate. The block layer isn't designed for memory-mapped access.

I think it makes sense to use memdev here. If the user wants a block device, they should use an emulated block device, not virtio-pmem, because buffering is necessary anyway when an image file format is used. Stefan