Re: [Qemu-devel] [PATCH v2 4/5] spapr: check if cpu core is already present

[Bharata B Rao <bharata@linux.vnet.ibm.com>]

On Tue, Mar 08, 2016 at 02:18:14PM +0100, Igor Mammedov wrote:
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> ---
> replaced link set check removed in previous patch
> ---
>  hw/ppc/spapr.c | 26 ++++++++++++++++++++++----
>  1 file changed, 22 insertions(+), 4 deletions(-)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index 6890a44..db33c29 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -2297,6 +2297,27 @@ void *spapr_populate_hotplug_cpu_dt(DeviceState *dev, CPUState *cs,
>      return fdt;
>  }
> 
> +static void spapr_machine_device_pre_plug(HotplugHandler *hotplug_dev,
> +                                          DeviceState *dev, Error **errp)
> +{
> +    sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(hotplug_dev);
> +    sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_dev);
> +
> +    if (object_dynamic_cast(OBJECT(dev), TYPE_SPAPR_CPU_CORE)) {
> +        int core = object_property_get_int(OBJECT(dev), CPU_CORE_ID_PROP,
> +                                           &error_abort);
> +
> +        if (!smc->dr_cpu_enabled && dev->hotplugged) {
> +            error_setg(errp, "CPU hotplug not supported for this machine");
> +            return;
> +        }
> +        if (spapr->cores[core]) {
> +            error_setg(errp, "core %d is already present", core);
> +            return;
> +        }

Wondering why can't we do the above check from core's realizefn and fail
the core hotplug from realizefn ?

Regards,
Bharata.