Add generic drive hotplugging

The monitor command for hotplugging is in i386 specific code. This is just
plain wrong, as S390 just learned how to do hotplugging too and needs to
get drives for that.

So let's add a generic copy to generic code that handles drive_add in a
way that doesn't have pci dependencies. All pci specific code can then
be handled in a pci specific function.

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - align generic drive_add to pci specific one
  - rework to split between generic and pci code

v2 -> v3:

  - remove comment

2 files changed, 51 insertions, 20 deletions

diff --git a/hw/device-hotplug.c b/hw/device-hotplug.c
index 8b2ed7a492..2bdc615b49 100644
--- a/hw/device-hotplug.c
+++ b/hw/device-hotplug.c
@@ -26,6 +26,9 @@
 #include "boards.h"
 #include "net.h"
 #include "blockdev.h"
+#include "qemu-config.h"
+#include "sysemu.h"
+#include "monitor.h"
 
 DriveInfo *add_init_drive(const char *optstr)
 {
@@ -44,3 +47,47 @@ DriveInfo *add_init_drive(const char *optstr)
 
     return dinfo;
 }
+
+#if !defined(TARGET_I386)
+int pci_drive_hot_add(Monitor *mon, const QDict *qdict,
+                      DriveInfo *dinfo, int type)
+{
+    /* On non-x86 we don't do PCI hotplug */
+    monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
+    return -1;
+}
+#endif
+
+void drive_hot_add(Monitor *mon, const QDict *qdict)
+{
+    int type;
+    DriveInfo *dinfo = NULL;
+    const char *opts = qdict_get_str(qdict, "opts");
+
+    dinfo = add_init_drive(opts);
+    if (!dinfo) {
+        goto err;
+    }
+    if (dinfo->devaddr) {
+        monitor_printf(mon, "Parameter addr not supported\n");
+        goto err;
+    }
+    type = dinfo->type;
+
+    switch (type) {
+    case IF_NONE:
+        monitor_printf(mon, "OK\n");
+        break;
+    default:
+        if (pci_drive_hot_add(mon, qdict, dinfo, type)) {
+            goto err;
+        }
+    }
+    return;
+
+err:
+    if (dinfo) {
+        drive_put_ref(dinfo);
+    }
+    return;
+}
diff --git a/hw/pci-hotplug.c b/hw/pci-hotplug.c
index 12f61fea6e..5c6307fa5d 100644
--- a/hw/pci-hotplug.c
+++ b/hw/pci-hotplug.c
@@ -104,24 +104,13 @@ static int scsi_hot_add(Monitor *mon, DeviceState *adapter,
     return 0;
 }
 
-void drive_hot_add(Monitor *mon, const QDict *qdict)
+int pci_drive_hot_add(Monitor *mon, const QDict *qdict,
+                      DriveInfo *dinfo, int type)
 {
     int dom, pci_bus;
     unsigned slot;
-    int type;
     PCIDevice *dev;
-    DriveInfo *dinfo = NULL;
     const char *pci_addr = qdict_get_str(qdict, "pci_addr");
-    const char *opts = qdict_get_str(qdict, "opts");
-
-    dinfo = add_init_drive(opts);
-    if (!dinfo)
-        goto err;
-    if (dinfo->devaddr) {
-        monitor_printf(mon, "Parameter addr not supported\n");
-        goto err;
-    }
-    type = dinfo->type;
 
     switch (type) {
     case IF_SCSI:
@@ -138,19 +127,14 @@ void drive_hot_add(Monitor *mon, const QDict *qdict)
             goto err;
         }
         break;
-    case IF_NONE:
-        monitor_printf(mon, "OK\n");
-        break;
     default:
         monitor_printf(mon, "Can't hot-add drive to type %d\n", type);
         goto err;
     }
-    return;
 
+    return 0;
 err:
-    if (dinfo)
-        drive_put_ref(dinfo);
-    return;
+    return -1;
 }
 
 static PCIDevice *qemu_pci_hot_add_storage(Monitor *mon,