Re: [Qemu-devel] [PATCH v2 1/2] vl: don't use RUN_STATE_PRECONFIG as initial state

[Igor Mammedov <imammedo@redhat.com>]

On Mon, 4 Jun 2018 21:56:47 -0300
Eduardo Habkost <ehabkost@redhat.com> wrote:

> On Mon, Jun 04, 2018 at 04:21:47PM +0200, Michal Privoznik wrote:
> [...]
> > > @@ -3572,7 +3570,12 @@ int main(int argc, char **argv, char **envp)
> > >                  }
> > >                  break;
> > >              case QEMU_OPTION_preconfig:
> > > -                preconfig_exit_requested = false;
> > > +                if (!runstate_check(RUN_STATE_NONE)) {
> > > +                    error_report("'--preconfig' and '--incoming' options are "
> > > +                                 "mutually exclusive");
> > > +                    exit(EXIT_FAILURE);
> > > +                }
> > > +                runstate_set(RUN_STATE_PRECONFIG);  
> > 
> > Specifying --preconfig twice on the command line now fails with a very
> > cryptic message (there's no --incoming).
> >   
> > >                  break;
> > >              case QEMU_OPTION_enable_kvm:
> > >                  olist = qemu_find_opts("machine");
> > > @@ -3768,9 +3771,12 @@ int main(int argc, char **argv, char **envp)
> > >                  }
> > >                  break;
> > >              case QEMU_OPTION_incoming:
> > > -                if (!incoming) {
> > > -                    runstate_set(RUN_STATE_INMIGRATE);
> > > +                if (!runstate_check(RUN_STATE_NONE)) {
> > > +                    error_report("'--preconfig' and '--incoming' options are "
> > > +                                 "mutually exclusive");
> > > +                    exit(EXIT_FAILURE);
> > >                  }
> > > +                runstate_set(RUN_STATE_INMIGRATE);  
> > 
> > Same here. Specifying --incoming twice fails with cryptic message. But
> > one can argue that specifying --incoming twice is wrong anyway.
> >   
> 
> Initially I was going to suggest simply not changing runstate
> during option parsing to avoid this kind of problem, but maybe
> this would be a nice way to implement the command-line parsing
> rules:
Is there a big reason to try making early incoming transition hack nicer?
I'd rather leave it as it is for now and fix it properly later
(i.e. postponing the transition after machine_done point, which is on my
todo list).
> 
>     case QEMU_OPTION_preconfig:
>         /*
>          * A INCOMING -> PRECONFIG transition would call:
>          *   error_setg("--preconfig and --incoming options are mutually exclusive");
>          */
>         try_runstate_set(RUN_STATE_PRECONFIG, &error_fatal);
>         break;
>     case QEMU_OPTION_incoming:
>         /*
>          * A PRECONFIG -> INCOMING transition would also call:
>          *   error_setg("--preconfig and --incoming options are mutually exclusive");
>          *
>          * Maybe a INCOMING -> INCOMING transition could
>          * result in:
>          *   error_setg("--incoming can't be specified twice");
>          */
>         try_runstate_set(RUN_STATE_INMIGRATE, &error_fatal);
>         break;
> 
> 
> > >                  incoming = optarg;
> > >                  break;
> > >              case QEMU_OPTION_only_migratable:  
> > 
> > Michal
> >   
>