Re: [Qemu-ppc] [RFC PATCH v1 3/5] spapr: Implement CPUClass::get_migration_id() for PowerPC CPUs

[David Gibson]

On Wed, Jul 06, 2016 at 02:01:14PM +0200, Igor Mammedov wrote:
> On Wed,  6 Jul 2016 14:29:19 +0530
> Bharata B Rao <address@hidden> wrote:
> 
> > cpu_index is used as migration_id by default. For machine type
> > versions that set use-migration-id property, cpu_dt_it is returned.
> > 
> > Signed-off-by: Bharata B Rao <address@hidden>
> > ---
> >  target-ppc/translate_init.c | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> > 
> > diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
> > index efd6b88..9ca2f5e 100644
> > --- a/target-ppc/translate_init.c
> > +++ b/target-ppc/translate_init.c
> > @@ -10359,6 +10359,17 @@ static gchar *ppc_gdb_arch_name(CPUState *cs)
> >  #endif
> >  }
> >  
> > +static int ppc_cpu_get_migration_id(CPUState *cs)
> > +{
> > +    PowerPCCPU *cpu = POWERPC_CPU(cs);
> > +
> > +    if (cs->use_migration_id) {
> > +        return (int) cpu->cpu_dt_id;
> Could cpu_dt_id have value bigger than 32bit int? If yes, it's not safe
> to do so, that's the reason why I'm going to use index in possible_cpus
> on ARM and for the sake of uniformity do the same for x86 (even though
> it's possible to use 32bit APIC ID).

No, I'm pretty sure the DT id fits in a 32-bit field in the device
tree itself, so it should be safe.

> 
> > +    } else {
> > +        return cs->cpu_index;
> > +    }
> > +}
> > +
> >  static void ppc_cpu_class_init(ObjectClass *oc, void *data)
> >  {
> >      PowerPCCPUClass *pcc = POWERPC_CPU_CLASS(oc);
> > @@ -10412,6 +10423,7 @@ static void ppc_cpu_class_init(ObjectClass
> > *oc, void *data) #ifndef CONFIG_USER_ONLY
> >      cc->virtio_is_big_endian = ppc_cpu_is_big_endian;
> >  #endif
> > +    cc->get_migration_id = ppc_cpu_get_migration_id;
> >  
> >      dc->fw_name = "PowerPC,UNKNOWN";
> >  }
> 

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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