[PATCH v8 16/21] microvm: wire up hotplug

[Gerd Hoffmann <kraxel@redhat.com>]

The cpu hotplug code handles the initialization of coldplugged cpus
too, so it is needed even in case cpu hotplug is not supported.

Wire cpu hotplug up for microvm.
Without this we get a broken MADT table.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Sergio Lopez <slp@redhat.com>
---
 hw/i386/microvm.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c
index 9df15354ce0f..8de8ca864963 100644
--- a/hw/i386/microvm.c
+++ b/hw/i386/microvm.c
@@ -320,6 +320,39 @@ static void microvm_fix_kernel_cmdline(MachineState *machine)
     g_free(cmdline);
 }
 
+static void microvm_device_pre_plug_cb(HotplugHandler *hotplug_dev,
+                                       DeviceState *dev, Error **errp)
+{
+    x86_cpu_pre_plug(hotplug_dev, dev, errp);
+}
+
+static void microvm_device_plug_cb(HotplugHandler *hotplug_dev,
+                                   DeviceState *dev, Error **errp)
+{
+    x86_cpu_plug(hotplug_dev, dev, errp);
+}
+
+static void microvm_device_unplug_request_cb(HotplugHandler *hotplug_dev,
+                                             DeviceState *dev, Error **errp)
+{
+    error_setg(errp, "unplug not supported by microvm");
+}
+
+static void microvm_device_unplug_cb(HotplugHandler *hotplug_dev,
+                                     DeviceState *dev, Error **errp)
+{
+    error_setg(errp, "unplug not supported by microvm");
+}
+
+static HotplugHandler *microvm_get_hotplug_handler(MachineState *machine,
+                                                   DeviceState *dev)
+{
+    if (object_dynamic_cast(OBJECT(dev), TYPE_CPU)) {
+        return HOTPLUG_HANDLER(machine);
+    }
+    return NULL;
+}
+
 static void microvm_machine_state_init(MachineState *machine)
 {
     MicrovmMachineState *mms = MICROVM_MACHINE(machine);
@@ -503,6 +536,7 @@ static void microvm_machine_initfn(Object *obj)
 static void microvm_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
 
     mc->init = microvm_machine_state_init;
 
@@ -524,6 +558,13 @@ static void microvm_class_init(ObjectClass *oc, void *data)
     /* Machine class handlers */
     mc->reset = microvm_machine_reset;
 
+    /* hotplug (for cpu coldplug) */
+    mc->get_hotplug_handler = microvm_get_hotplug_handler;
+    hc->pre_plug = microvm_device_pre_plug_cb;
+    hc->plug = microvm_device_plug_cb;
+    hc->unplug_request = microvm_device_unplug_request_cb;
+    hc->unplug = microvm_device_unplug_cb;
+
     object_class_property_add(oc, MICROVM_MACHINE_PIC, "OnOffAuto",
                               microvm_machine_get_pic,
                               microvm_machine_set_pic,
@@ -573,6 +614,7 @@ static const TypeInfo microvm_machine_info = {
     .class_size    = sizeof(MicrovmMachineClass),
     .class_init    = microvm_class_init,
     .interfaces = (InterfaceInfo[]) {
+         { TYPE_HOTPLUG_HANDLER },
          { }
     },
 };
-- 
2.27.0