Re: [PATCH] Deprecate pmem=on with non-DAX capable backend file

It is not safe to pretend that emulated NVDIMM supports persistence while backend actually failed to enable it and used non-persistent mapping as fall back. Instead of falling-back, QEMU should be more strict and error out with clear message that it's not supported. So if user asks for persistence (pmem=on), they should store backing file on NVDIMM. Signed-off-by: Igor Mammedov <imammedo(a)redhat.com&gt; Reviewed-by: Philippe Mathieu-Daudé <philmd(a)redhat.com&gt;