Re: [Qemu-devel] [for-2.7 PATCH v3 15/15] spapr: implement query-hotpluggable-cpus callback

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, May 12, 2016 at 09:18:25AM +0530, Bharata B Rao wrote:
> From: Igor Mammedov <imammedo@redhat.com>
> 
> It returns a list of present/possible to hotplug CPU
> objects with a list of properties to use with
> device_add.
> 
> in spapr case returned list would looks like:
> -> { "execute": "query-hotpluggable-cpus" }
> <- {"return": [
>      { "props": { "core": 8 }, "type": "POWER8-spapr-cpu-core",
>        "vcpus-count": 2 },
>      { "props": { "core": 0 }, "type": "POWER8-spapr-cpu-core",
>        "vcpus-count": 2,
>        "qom-path": "/machine/unattached/device[0]"}
>    ]}'
> 
> TODO:
>   add 'node' property for core <-> numa node mapping
> 
> Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
> ---
>  hw/ppc/spapr.c | 34 ++++++++++++++++++++++++++++++++++
>  1 file changed, 34 insertions(+)
> 
> diff --git a/hw/ppc/spapr.c b/hw/ppc/spapr.c
> index a8cd74d..ae95580 100644
> --- a/hw/ppc/spapr.c
> +++ b/hw/ppc/spapr.c
> @@ -66,6 +66,7 @@
>  #include "hw/compat.h"
>  #include "qemu/cutils.h"
>  #include "hw/ppc/spapr_cpu_core.h"
> +#include "qmp-commands.h"
>  
>  #include <libfdt.h>
>  
> @@ -2391,6 +2392,38 @@ static unsigned spapr_cpu_index_to_socket_id(unsigned cpu_index)
>      return cpu_index / smp_threads / smp_cores;
>  }
>  
> +static HotpluggableCPUList *spapr_query_hotpluggable_cpus(MachineState *machine)
> +{
> +    int i;
> +    HotpluggableCPUList *head = NULL;
> +    sPAPRMachineState *spapr = SPAPR_MACHINE(machine);
> +    int spapr_max_cores = max_cpus / smp_threads;
> +    int smt = kvmppc_smt_threads();
> +
> +    for (i = 0; i < spapr_max_cores; i++) {
> +        HotpluggableCPUList *list_item = g_new0(typeof(*list_item), 1);
> +        HotpluggableCPU *cpu_item = g_new0(typeof(*cpu_item), 1);
> +        CpuInstanceProperties *cpu_props = g_new0(typeof(*cpu_props), 1);
> +
> +        cpu_item->type = spapr_get_cpu_core_type(machine->cpu_model);
> +        cpu_item->vcpus_count = smp_threads;
> +        cpu_props->has_core = true;
> +        cpu_props->core = i * smt;

I'm thinking we should probably use the existing vcpu_dt_id logic
here, to make sure we don't change things if we ever alter that.

> +        /* TODO: add 'has_node/node' here to describe
> +           to which node core belongs */
> +
> +        cpu_item->props = cpu_props;
> +        if (spapr->cores[i]) {
> +            cpu_item->has_qom_path = true;
> +            cpu_item->qom_path = object_get_canonical_path(spapr->cores[i]);
> +        }
> +        list_item->value = cpu_item;
> +        list_item->next = head;
> +        head = list_item;
> +    }
> +    return head;
> +}
> +
>  static void spapr_machine_class_init(ObjectClass *oc, void *data)
>  {
>      MachineClass *mc = MACHINE_CLASS(oc);
> @@ -2421,6 +2454,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
>      hc->plug = spapr_machine_device_plug;
>      hc->unplug = spapr_machine_device_unplug;
>      mc->cpu_index_to_socket_id = spapr_cpu_index_to_socket_id;
> +    mc->query_hotpluggable_cpus = spapr_query_hotpluggable_cpus;
>  
>      smc->dr_lmb_enabled = true;
>      smc->dr_cpu_enabled = true;

-- 
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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