Re: [Qemu-devel] [PATCHv3 4/5] pseries: Enable HPT resizing for 2.9

[David Gibson]

On Wed, Dec 14, 2016 at 04:32:26PM +1100, Suraj Jitindar Singh wrote:
> On Mon, 2016-12-12 at 15:06 +1100, David Gibson wrote:
> > We've now implemented a PAPR extensions which allows PAPR guests
> > (i.e.
> > "pseries" machine type) to resize their hash page table during
> > runtime.
> > 
> > However, that extension is only enabled if explicitly chosen on the
> > command line.  This patch enables it by default for spapr-2.9, but
> > leaves
> > it disabled (by default) for older machine types.
> > 
> > Signed-off-by: David Gibson <address@hidden>
> > Reviewed-by: Laurent Vivier <address@hidden>
> > ---
> >  hw/ppc/spapr.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> > index d057031..f05d0e5 100644
> > --- a/hw/ppc/spapr.c
> > +++ b/hw/ppc/spapr.c
> > @@ -2779,7 +2779,7 @@ static void
> > spapr_machine_class_init(ObjectClass *oc, void *data)
> >  
> >      smc->dr_lmb_enabled = true;
> >      smc->tcg_default_cpu = "POWER8";
> > -    smc->resize_hpt_default = SPAPR_RESIZE_HPT_DISABLED;
> > +    smc->resize_hpt_default = SPAPR_RESIZE_HPT_ENABLED;
> >      mc->query_hotpluggable_cpus = spapr_query_hotpluggable_cpus;
> >      fwc->get_dev_path = spapr_get_fw_dev_path;
> >      nc->nmi_monitor_handler = spapr_nmi;
> > @@ -2860,8 +2860,11 @@ static void
> > spapr_machine_2_8_instance_options(MachineState *machine)
> >  
> >  static void spapr_machine_2_8_class_options(MachineClass *mc)
> >  {
> > +    sPAPRMachineClass *smc = SPAPR_MACHINE_CLASS(mc);
> > +
> >      spapr_machine_2_9_class_options(mc);
> >      SET_MACHINE_COMPAT(mc, SPAPR_COMPAT_2_8);
> > +    smc->resize_hpt_default = SPAPR_RESIZE_HPT_DISABLED;
> >  }
> >  
> >  DEFINE_SPAPR_MACHINE(2_8, "2.8", false);
> If people don't want this by default they should probably specify on
> the command line.

Uh.. I don't follow you.

> Reviewed-by: Suraj Jitindar Singh <address@hidden>
> 

-- 
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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