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These aren't diminutives... They are declined forms of Весь

It can mean all, all of, the whole, everything, eyeryone

Весь is used with masculine nouns:
Весь флот был в море - The whole navy...

If Петя is a woman (i.e. Petra), then would not this sentence be correct?[/quote]

No. Firstly Петя is short for Пётр (Peter). Secondly, Вы ALWAYS takes plural forms, no matter if it reffers to one...

Don't confuse всё with все
It goes like this:

All
Masc: Весь
Fem: Вся
Neut: Всё
Plu: Все

In your example it is Всё