On Mon, Oct 11, 2021 at 02:17:30PM +0100, Szabolcs Nagy wrote:

> > +* PSTATE.SM and PSTATE.ZA, the streaming mode vector length and the ZA
> > +  register state are tracked per thread.

> can you add a note that there is a new TPIDR2_EL0
> per thread and on thread creation it's 0 (and i
> guess unchanged on fork).

Sure.  It's actually reset to 0 on fork() - would that be a problem?

> at least this abi makes most sense to me.

OK, thanks.