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

[Scott Wood <scottwood@freescale.com>]

On 06/13/2013 01:31:48 PM, Anthony Liguori wrote:
> 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.

Why?  As long as it's present in the default ppc64 build, you'll have a  
default machine.  If a user makes a custom config without it,  
presumably they know they want to run some other machine, so why do you  
need a default?

QEMU has too much mandatory stuff as is.

-Scott