pci: allow devices being tagged as not hotpluggable.

This patch adds a field to PCIDeviceInfo to tag devices as being
not hotpluggable.  Any attempt to plug-in or -out such a device
will throw an error.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

hw/pci.c

@@ -1624,6 +1624,11 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base)
                                      info->is_bridge);
     if (pci_dev == NULL)
         return -1;
+    if (qdev->hotplugged && info->no_hotplug) {
+        qerror_report(QERR_DEVICE_NO_HOTPLUG, info->qdev.name);
+        do_pci_unregister_device(pci_dev);
+        return -1;
+    }
     rc = info->init(pci_dev);
     if (rc != 0) {
         do_pci_unregister_device(pci_dev);
@@ -1656,7 +1661,12 @@ static int pci_qdev_init(DeviceState *qdev, DeviceInfo *base)
 static int pci_unplug_device(DeviceState *qdev)
 {
     PCIDevice *dev = DO_UPCAST(PCIDevice, qdev, qdev);
+    PCIDeviceInfo *info = container_of(qdev->info, PCIDeviceInfo, qdev);
 
+    if (info->no_hotplug) {
+        qerror_report(QERR_DEVICE_NO_HOTPLUG, info->qdev.name);
+        return -1;
+    }
     return dev->bus->hotplug(dev->bus->hotplug_qdev, dev,
                              PCI_HOTPLUG_DISABLED);
 }

hw/pci.h

@@ -436,6 +436,9 @@ typedef struct {
     /* pcie stuff */
     int is_express;   /* is this device pci express? */
 
+    /* device isn't hot-pluggable */
+    int no_hotplug;
+
     /* rom bar */
     const char *romfile;
 } PCIDeviceInfo;

qerror.c

@@ -100,6 +100,10 @@ static const QErrorStringTable qerror_table[] = {
         .error_fmt = QERR_DEVICE_NO_BUS,
         .desc      = "Device '%(device)' has no child bus",
     },
+    {
+        .error_fmt = QERR_DEVICE_NO_HOTPLUG,
+        .desc      = "Device '%(device)' does not support hotplugging",
+    },
     {
         .error_fmt = QERR_DUPLICATE_ID,
         .desc      = "Duplicate ID '%(id)' for %(object)",

qerror.h

@@ -90,6 +90,9 @@ QError *qobject_to_qerror(const QObject *obj);
 #define QERR_DEVICE_NO_BUS \
     "{ 'class': 'DeviceNoBus', 'data': { 'device': %s } }"
 
+#define QERR_DEVICE_NO_HOTPLUG \
+    "{ 'class': 'DeviceNoHotplug', 'data': { 'device': %s } }"
+
 #define QERR_DUPLICATE_ID \
     "{ 'class': 'DuplicateId', 'data': { 'id': %s, 'object': %s } }"