That was one of the questions on the call/presentation I was recently on and no one has a clear answer at the moment ( I suppose it is not a surprise since we can't take Yellen at her word ). Some clarity will be needed and sooner rather than later if stated policy and rules are to be believed to be real policy and rules.
FWIW, odds are, just about every bank by now has either reviewed or scrambling to review their exposure.
I do not envy the weight of Yellen's decisions, because from where I sit it is still hard to tell if it was a 'less bad choice' available.