remote/machine: add HotplugHandler for remote machine

Allow hotplugging of PCI(e) devices to remote machine

Signed-off-by: Elena Ufimtseva <elena.ufimtseva@oracle.com>
Signed-off-by: John G Johnson <john.g.johnson@oracle.com>
Signed-off-by: Jagannathan Raman <jag.raman@oracle.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: d1e6cfa0afb528ad343758f9b1d918be0175c5e5.1655151679.git.jag.raman@oracle.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

hw/remote/machine.c

@@ -20,6 +20,7 @@
 #include "qapi/error.h"
 #include "hw/pci/pci_host.h"
 #include "hw/remote/iohub.h"
+#include "hw/qdev-core.h"
 
 static void remote_machine_init(MachineState *machine)
 {
@@ -53,14 +54,19 @@ static void remote_machine_init(MachineState *machine)
 
     pci_bus_irqs(pci_host->bus, remote_iohub_set_irq, remote_iohub_map_irq,
                  &s->iohub, REMOTE_IOHUB_NB_PIRQS);
+
+    qbus_set_hotplug_handler(BUS(pci_host->bus), OBJECT(s));
 }
 
 static void remote_machine_class_init(ObjectClass *oc, void *data)
 {
     MachineClass *mc = MACHINE_CLASS(oc);
+    HotplugHandlerClass *hc = HOTPLUG_HANDLER_CLASS(oc);
 
     mc->init = remote_machine_init;
     mc->desc = "Experimental remote machine";
+
+    hc->unplug = qdev_simple_device_unplug_cb;
 }
 
 static const TypeInfo remote_machine = {
@@ -68,6 +74,10 @@ static const TypeInfo remote_machine = {
     .parent = TYPE_MACHINE,
     .instance_size = sizeof(RemoteMachineState),
     .class_init = remote_machine_class_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_HOTPLUG_HANDLER },
+        { }
+    }
 };
 
 static void remote_machine_register_types(void)