Re: what are the requirements on target/ code for -icount to work correctly?

[Peter Maydell]

On Fri, 19 Jun 2020 at 13:37, Paolo Bonzini <pbonzini@redhat.com> wrote:
>
> On 19/06/20 14:18, Peter Maydell wrote:
> > On Fri, 19 Jun 2020 at 12:16, Paolo Bonzini <pbonzini@redhat.com> wrote:
> >>
> >> On 19/06/20 07:46, Pavel Dovgalyuk wrote:
> >>> I think, that we need some efforts from target maintainers to remove all 
> >>> such calls.
> >>
> >> I'll take care of target/i386 (which does need one of the three
> >> gen_io_end calls that are left).
> >
> > So why does it need it ? Why can't it just rely on "TB going to
> > end anyway which will clear the can_do_io flag" ?
>
> Because the TB is not always going to end in that case that is left.

OK, so when is it valid not to end the TB after an IO instruction ?
My initial belief was that the TB should *always* end.

thanks
-- PMM