[Bug 222807] PURE entropy sources are harvested but not mixed in. Also, min-entropy low per SP800-90B measurements

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222807

--- Comment #6 from Conrad Meyer <cem at freebsd.org> ---
So hc_source_mask is initialized to RANDOM_HARVEST_EVERYTHING_MASK.

Is expanding RANDOM_HARVEST_EVERYTHING_MASK to cover the Pure devices
sufficient to harvest from RDRAND and Via?  Or would that break anything (e.g.,
due to the devices that did not register)?

Yes, the rest of the 1st patch is a nice enhancement to expose those bits to
userspace that were not exposed before.  I'm just not clear on if the bits must
only be set on registration, or if it's ok to just have them all set from the
beginning.

Thanks!

Would you mind throwing the patches up on Phabricator so comments can be more
clearly associated with specific lines of code?

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