[Qemu-devel] [PATCH v3 17/21] s390x: CPU hot unplug via device_del cannot work for now

[David Hildenbrand <david@redhat.com>]

device_del on a CPU will currently do nothing. Let's emmit an error
telling that this is will currently not work (there is no architecture
support on s390x). Error message copied from ppc.

(qemu) device_del cpu1
device_del cpu1
CPU hot unplug not supported on this machine

Reviewed-by: Matthew Rosato <mjrosato@linux.vnet.ibm.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 hw/s390x/s390-virtio-ccw.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index 2086eb6ca6..120f82e339 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -341,6 +341,15 @@ static void s390_machine_device_plug(HotplugHandler *hotplug_dev,
     }
 }
 
+static void s390_machine_device_unplug_request(HotplugHandler *hotplug_dev,
+                                               DeviceState *dev, Error **errp)
+{
+    if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+        error_setg(errp, "CPU hot unplug not supported on this machine");
+        return;
+    }
+}
+
 static HotplugHandler *s390_get_hotplug_handler(MachineState *machine,
                                                 DeviceState *dev)
 {
@@ -390,6 +399,7 @@ static void ccw_machine_class_init(ObjectClass *oc, void *data)
     mc->max_cpus = 248;
     mc->get_hotplug_handler = s390_get_hotplug_handler;
     hc->plug = s390_machine_device_plug;
+    hc->unplug_request = s390_machine_device_unplug_request;
     nc->nmi_monitor_handler = s390_nmi;
 }
 
-- 
2.13.5