Revert "spapr: Ensure CPU cores are added contiguously and removed in LIFO order"

This reverts commit 5cbc64de.

Now that we have stable cpu_index values for pseries-2.7 (and future)
machine types, we can now safely allow hotplug and unplug in any order.

Conflicts:
	hw/ppc/spapr_cpu_core.c

Some conflicts on revert due to some small changes in the inserted
code since the original commit.
Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>

hw/ppc/spapr_cpu_core.c

@@ -125,7 +125,6 @@ static void spapr_core_release(DeviceState *dev, void *opaque)
 void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
                        Error **errp)
 {
-    sPAPRMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
     CPUCore *cc = CPU_CORE(dev);
     int smt = kvmppc_smt_threads();
     int index = cc->core_id / smp_threads;
@@ -133,16 +132,7 @@ void spapr_core_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
         spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_CPU, index * smt);
     sPAPRDRConnectorClass *drck;
     Error *local_err = NULL;
-    int spapr_max_cores = max_cpus / smp_threads;
-    int i;
 
-    for (i = spapr_max_cores - 1; i > index; i--) {
-        if (spapr->cores[i]) {
-            error_setg(errp, "core-id %d should be removed first",
-                       i * smp_threads);
-            return;
-        }
-    }
     g_assert(drc);
 
     drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
@@ -224,7 +214,7 @@ void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
     sPAPRMachineClass *smc = SPAPR_MACHINE_GET_CLASS(OBJECT(hotplug_dev));
     sPAPRMachineState *spapr = SPAPR_MACHINE(OBJECT(hotplug_dev));
     int spapr_max_cores = max_cpus / smp_threads;
-    int index, i;
+    int index;
     Error *local_err = NULL;
     CPUCore *cc = CPU_CORE(dev);
     char *base_core_type = spapr_get_cpu_core_type(machine->cpu_model);
@@ -261,14 +251,6 @@ void spapr_core_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
         goto out;
     }
 
-    for (i = 0; i < index; i++) {
-        if (!spapr->cores[i]) {
-            error_setg(&local_err, "core-id %d should be added first",
-                       i * smp_threads);
-            goto out;
-        }
-    }
-
 out:
     g_free(base_core_type);
     error_propagate(errp, local_err);