Re: [Qemu-devel] [Qemu-ppc] [PATCH] target-ppc: Change default machine for 64-bit

[Anthony Liguori <aliguori@us.ibm.com>]

Alexander Graf <agraf@suse.de> writes:

> On 17.05.2013, at 09:42, Andreas Färber wrote:
>
>> Am 17.05.2013 06:25, schrieb David Gibson:
>>> Currently, for qemu-system-ppc64, the default machine type is 'mac99'.
>>> Since the mac99 machine is not being actively maintained, and shows quite
>>> a few signs of bitrot,
>> 
>> Please be more specific than making such general claims in a commit
>> message! As the default machine it certainly compiles, so where are you
>> seeing bitrot? The DEC bridge cleanup that I once started kind of
>> depends on the PCI cleanup you recently looked into.
>
> The mac99 machine for 64bit is actually worse than anything bitrot
> could give you. It emulates a machine that in its form never possibly
> could have existed in real hardware, which makes it very fragile and
> dependent on the guest's mercy to handle this gracefully.

I'll note that we have a CONFIG_PSERIES today.  I'd suggest getting rid
of it first before making pseries the default.

I still think spapr would be a better name than pseries FWIW since
that's what it's referred to in the code.

Regards,

Anthony Liguori

>
> Given the current state and amount of development on the pseries target, I think it makes sense to declare that as the default for qemu-system-ppc64.
>
> I would still love to see -M mac99 emulate a proper U2 or U1 based system for 32bit. And I would also love to see a real U4 based emulation model come up for qemu-system-ppc64. But I doubt I'll have time to work on either :).
>
>
> Alex