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On 2017-02-20 13:38:31 +0000 (+0000), Daniel P. Berrange wrote:
[...]
>    Rather than mounting as a filesystem, you can also use NVDIMM directly
>    as a raw memory block, in which case it can contain whatever data format
>    you want - not merely a filesystem. With the right design, you could come
>    up with a format that let you store the role device metadata in a NVDIMM
>    and be able to update its contents on the fly for the guest during hotplug.
[...]

Maybe it's just me, but this begs for a (likely fairly trivial?)
kernel module exposing that data under /sys or /proc (at least for
*nix guests).
-- 
Jeremy Stanley