Re: [PATCH v4 16/19] mac_newworld: Add machine types for different mac99 configs

[BALATON Zoltan]

On Fri, 28 Oct 2022, Mark Cave-Ayland wrote:
> On 25/10/2022 17:44, BALATON Zoltan wrote:
> > The mac99 machine emulates different machines depending on machine
> > properties or even if it is run as qemu-system-ppc64 or
> > qemu-system-ppc. This is very confusing for users and many hours were
> > lost trying to explain it or finding out why commands users came up
> > with are not working as expected. (E.g. Windows users might think
> > qemu-system-ppc64 is just the 64 bit version of qemu-system-ppc and
> > then fail to boot a 32 bit OS with -M mac99 trying to follow an
> > example that had qemu-system-ppc.) To avoid such confusion, add
> > explicit machine types for the different configs which will work the
> > same with both qemu-system-ppc and qemu-system-ppc64 and also make the
> > command line clearer for new users.
>
> What was the outcome of the discussion re: having separate machines for 
> 32-bit and 64-bit PPC targets? My understanding is the issue here was 
> deciding what to do, rather than actually making the code changes.

Who do you think will or should decide about this? There are about 3 
people who care about Mac emulation on this list: you, Howard and me. You 
already have my and Howard's vote to introduce these machines types. Who 
else should vote or decide on this? Please apply this patch now and if it 
causes problem it can still be dropped duting the freeze but if you don't 
apply it now it can't get into before next spring.

> Also what was your motivation for choosing the machine names? I see you've 
> used powerbook for via=pmu-adb, but I think quite a few people use pmu-adb 
> for older OS X server hardware. At the very least some pointers to reference 
> device trees and some rationale behind the decision is needed for review.

See my reply to Howard's message with some more info and links. My 
immediate motivation was that we've lost about two days when somobody 
contacted me about VGA pass through sending logs about all kinds of 
failures he got. After many logs I've noticed that he was using 
qemu-system-ppc64 -M mac99,via=pmu thinking that on 64bit host that's the 
executable he should use. Unfortunately the commands were not shared just 
the logs so this took a while to notice. Also if you look at the forum 
Howard runs you can see this problem is coming up frequently and I think 
the've also lost countless hours due to this. It's about time to put an 
end on it and stop wasting othet's time. As for The machines, the powermac 
ones are straight forward as those are closest to what we emulate for G4 
and G5 Mac. I've chosen the powerbook becuase that's the only machine I 
know that had PMU and ADB but If someone knows a better machine we can 
change this (even as bug fix during the freeze). Here's some info on this 
powerbook: https://ppc.0penbsd.narkive.com/s49Kcx1u/x-on-powerbook-g4

Regards,
BALATON Zoltan

> > Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
> > ---
> >   hw/ppc/mac_newworld.c | 94 +++++++++++++++++++++++++++++++++++++++++++
> >   1 file changed, 94 insertions(+)
> >
> > diff --git a/hw/ppc/mac_newworld.c b/hw/ppc/mac_newworld.c
> > index bcd6566ead..7321ac925e 100644
> > --- a/hw/ppc/mac_newworld.c
> > +++ b/hw/ppc/mac_newworld.c
> > @@ -649,9 +649,103 @@ static const TypeInfo core99_machine_info = {
> >       },
> >   };
> >   +static void powermac3_1_machine_class_init(ObjectClass *oc, void *data)
> > +{
> > +    MachineClass *mc = MACHINE_CLASS(oc);
> > +
> > +    core99_machine_class_init(oc, data);
> > +    mc->desc = "Apple Power Mac G4 AGP (Sawtooth)";
> > +    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("7400_v2.9");
> > +}
> > +
> > +static void powermac3_1_instance_init(Object *obj)
> > +{
> > +    Core99MachineState *cms = CORE99_MACHINE(obj);
> > +
> > +    cms->via_config = CORE99_VIA_CONFIG_PMU;
> > +    return;
> > +}
> > +
> > +static const TypeInfo powermac3_1_machine_info = {
> > +    .name          = MACHINE_TYPE_NAME("powermac3_1"),
> > +    .parent        = TYPE_MACHINE,
> > +    .class_init    = powermac3_1_machine_class_init,
> > +    .instance_init = powermac3_1_instance_init,
> > +    .instance_size = sizeof(Core99MachineState),
> > +    .interfaces = (InterfaceInfo[]) {
> > +        { TYPE_FW_PATH_PROVIDER },
> > +        { }
> > +    },
> > +};
> > +
> > +static void powerbook3_2_machine_class_init(ObjectClass *oc, void *data)
> > +{
> > +    MachineClass *mc = MACHINE_CLASS(oc);
> > +
> > +    core99_machine_class_init(oc, data);
> > +    mc->desc = "Apple PowerBook G4 Titanium (Mercury)";
> > +    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("7400_v2.9");
> > +}
> > +
> > +static void powerbook3_2_instance_init(Object *obj)
> > +{
> > +    Core99MachineState *cms = CORE99_MACHINE(obj);
> > +
> > +    cms->via_config = CORE99_VIA_CONFIG_PMU_ADB;
> > +    return;
> > +}
> > +
> > +static const TypeInfo powerbook3_2_machine_info = {
> > +    .name          = MACHINE_TYPE_NAME("powerbook3_2"),
> > +    .parent        = TYPE_MACHINE,
> > +    .class_init    = powerbook3_2_machine_class_init,
> > +    .instance_init = powerbook3_2_instance_init,
> > +    .instance_size = sizeof(Core99MachineState),
> > +    .interfaces = (InterfaceInfo[]) {
> > +        { TYPE_FW_PATH_PROVIDER },
> > +        { }
> > +    },
> > +};
> > +
> > +#ifdef TARGET_PPC64
> > +static void powermac7_3_machine_class_init(ObjectClass *oc, void *data)
> > +{
> > +    MachineClass *mc = MACHINE_CLASS(oc);
> > +
> > +    core99_machine_class_init(oc, data);
> > +    mc->desc = "Apple Power Mac G5 (Niagara)";
> > +    mc->default_cpu_type = POWERPC_CPU_TYPE_NAME("970fx_v3.1");
> > +}
> > +
> > +static void powermac7_3_instance_init(Object *obj)
> > +{
> > +    Core99MachineState *cms = CORE99_MACHINE(obj);
> > +
> > +    cms->via_config = CORE99_VIA_CONFIG_PMU;
> > +    return;
> > +}
> > +
> > +static const TypeInfo powermac7_3_machine_info = {
> > +    .name          = MACHINE_TYPE_NAME("powermac7_3"),
> > +    .parent        = TYPE_MACHINE,
> > +    .class_init    = powermac7_3_machine_class_init,
> > +    .instance_init = powermac7_3_instance_init,
> > +    .instance_size = sizeof(Core99MachineState),
> > +    .interfaces = (InterfaceInfo[]) {
> > +        { TYPE_FW_PATH_PROVIDER },
> > +        { }
> > +    },
> > +};
> > +#endif
> > +
> >   static void mac_machine_register_types(void)
> >   {
> >       type_register_static(&core99_machine_info);
> > +    type_register_static(&powermac3_1_machine_info);
> > +    type_register_static(&powerbook3_2_machine_info);
> > +#ifdef TARGET_PPC64
> > +    type_register_static(&powermac7_3_machine_info);
> > +#endif
> >   }
> >     type_init(mac_machine_register_types)
>
>
> ATB,
>
> Mark.