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>
---
 hw/remote/machine.c | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/hw/remote/machine.c b/hw/remote/machine.c
index 952105eab5..220ff01aa9 100644
--- a/hw/remote/machine.c
+++ b/hw/remote/machine.c
@@ -54,14 +54,39 @@ 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_pre_plug_cb(HotplugHandler *hotplug_dev,
+                                       DeviceState *dev, Error **errp)
+{
+    if (!object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+        error_setg(errp, "Only allowing PCI hotplug");
+    }
+}
+
+static void remote_machine_unplug_cb(HotplugHandler *hotplug_dev,
+                                     DeviceState *dev, Error **errp)
+{
+    if (!object_dynamic_cast(OBJECT(dev), TYPE_PCI_DEVICE)) {
+        error_setg(errp, "Only allowing PCI hot-unplug");
+        return;
+    }
+
+    qdev_unrealize(dev);
 }
 
 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->pre_plug = remote_machine_pre_plug_cb;
+    hc->unplug = remote_machine_unplug_cb;
 }
 
 static const TypeInfo remote_machine = {
@@ -69,6 +94,10 @@ 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)
-- 
2.20.1