On Thu, Jun 29, 2017 at 3:12 PM, Linda Knippers <linda.knippers@xxxxxxx> wrote: [..] >> The /dev/pmem >> device name just tells you that your block device is hosted by a >> driver that knows how to handle persistent memory constraints, but any >> other details about the nature of the address range need to come from >> other sources of information, and potentially information sources that >> the kernel does not know about. > > > I'm asking about the other source of information in this specific case > where we're exposing pmem devices that will never ever be persistent. > Before we add these devices, I think we should be able to tell the user > how they can know the properties of the underlying device. The only way I can think to indicate this is with a platform + device whitelist in a tool like ndctl. Where the tool says "yes, these xyz-vendor DIMMs on this abc-vendor platform with this 123-version BIOS" is a known good persistent configuration.
