"Tented vias" is not the term to use these days now that almost all
solder mask is liquid and not dry film which is a real tent.  It would
be wise to mention on the drawings that the vias should be filled and
also from which side or both sides if desired.  To go one step further,
you should specify HOW to fill.  This could be with epoxy ink, uv cure,
solder, etc.  the fabricator will have his favorite, and you should check
with the vendor chosen.  To weasel word this situation, if you do not
know the vendor or if there are many, put the method on the Purchase 
Order so each vendor and you can decide the process.
if you do use dry film then a note that vias should be tented both sides
is fine on the drawing.

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