This looks like a straightforward 3S bid to me. You have good cards and a stiff heart, but the fact that you have only 3 spades is a negative.
X is NOT penalty. It generally shows 3 spades and a good hand (better than you have). Partner can bid 3S, 4S, or even pass with something like:
xxxxx
KQT
Kxx
Qx
Cheers,
Mike