Il 09/09/2014 15:59, Juan Quintela ha scritto:
> If it is still -1 at this point, we "calculate" a value for it.
> (I assume it is right, no knowledge of serial port)
Not necessarily right, or we wouldn't need the subsection, but at least
a decent approximation.
> But poll_msl is "more" interesting, because we are not "reseting it".
>
> So, we have that if we are migrating from an old version, we would have
> poll_msl == -1, and we used to have it to poll_msl == 0.
>
> Should we change it?
>
> I think that putting:
>
> s->poll_msl = 0;
>
> in preload, and
>
> static bool serial_poll_needed(void *opaque)
> {
> SerialState *s = opaque;
> return s->poll_msl != 0;
> }
>
> would give exactly the same behaviour for new qemus, and behave better
> for older ones?
poll_msl is usually -1, so the "needed" function must be like Pavel wrote.
poll_msl is only used for serial port passthrough, which I guess we can
say "just doesn't work" for migration on < 2.1. In fact, putting
migration + passthrough together is probably not a great idea. :) We
probably could drop ust the poll_msl/modem_status_poll subsection, but I
assume Pavel had some kind of test case.
Paolo
