Re: [Qemu-devel] [PATCH 4/5] pseries: Export /machine "rtc-time" property

[David Gibson]

On Tue, Dec 16, 2014 at 02:04:49AM +0100, Alexander Graf wrote:
> 
> 
> On 16.12.14 01:43, David Gibson wrote:
> > On x86, the guest's RTC can be read with QMP via the "rtc-time" property
> > on the /machine object.  This is due to an explicit QOM alias being set up
> > by the mc146818rtc driver, and doesn't work on other targets.
> > 
> > This extends the pseries RTAS RTC to populate that property, for improved
> > management compatibility with x86 guests.
> > 
> > Signed-off-by: David Gibson <address@hidden>
> 
> Yeah, this really should happen inside an rtc device.
> 
> > ---
> >  hw/ppc/spapr_rtc.c | 49 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 49 insertions(+)
> > 
> > diff --git a/hw/ppc/spapr_rtc.c b/hw/ppc/spapr_rtc.c
> > index fac0017..13e74f1 100644
> > --- a/hw/ppc/spapr_rtc.c
> > +++ b/hw/ppc/spapr_rtc.c
> > @@ -28,6 +28,7 @@
> >  #include "cpu.h"
> >  #include "hw/ppc/spapr.h"
> >  #include "qapi-event.h"
> > +#include "qapi/visitor.h"
> >  
> >  void spapr_rtc_read(sPAPREnvironment *spapr, struct tm *tm, uint32_t *ns)
> >  {
> > @@ -87,10 +88,58 @@ static void rtas_set_time_of_day(PowerPCCPU *cpu, 
> > sPAPREnvironment *spapr,
> >      rtas_st(rets, 0, RTAS_OUT_SUCCESS);
> >  }
> >  
> > +static void spapr_qom_rtc_time(Object *obj, Visitor *v, void *opaque,
> > +                               const char *name, Error **errp)
> 
> Also this function is mostly copy&paste from the mc14foo driver. Do you
> think you can share this somehow?

I guess I can make a helper function.

> I also think the alias should get created by the machine, not the device
> itself.

Again, I'm copying what mc146818rtc does.

-- 
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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