switch balloon initialization to -device.

With that patch applied "-balloon virtio,args" becomes a shortcut for
"-device virtio-balloon-pci,args".

Side effects:
 - ballon device gains support for id=<tag>.
 - ballon device is off by default now.
 - initialization order changes, which may in different pci slot
   assignment depending on the VM configuration.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

3 files changed, 18 insertions, 25 deletions

diff --git a/hw/pc.c b/hw/pc.c
index 77ad8a1084..32713b452a 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -1123,7 +1123,6 @@ static void pc_init1(ram_addr_t ram_size,
     ram_addr_t below_4g_mem_size, above_4g_mem_size = 0;
     int bios_size, isa_bios_size, oprom_area_size;
     PCIBus *pci_bus;
-    PCIDevice *pci_dev;
     ISADevice *isa_dev;
     int piix3_devfn = -1;
     CPUState *env;
@@ -1423,12 +1422,6 @@ static void pc_init1(ram_addr_t ram_size,
         }
     }
 
-    /* Add virtio balloon device */
-    if (pci_enabled && virtio_balloon) {
-        pci_dev = pci_create("virtio-balloon-pci", virtio_balloon_devaddr);
-        qdev_init(&pci_dev->qdev);
-    }
-
     /* Add virtio console devices */
     if (pci_enabled) {
         for(i = 0; i < MAX_VIRTIO_CONSOLES; i++) {
diff --git a/sysemu.h b/sysemu.h
index d42fe9dc7e..45aa8b0dd2 100644
--- a/sysemu.h
+++ b/sysemu.h
@@ -125,8 +125,6 @@ extern int win2k_install_hack;
 extern int rtc_td_hack;
 extern int alt_grab;
 extern int usb_enabled;
-extern int virtio_balloon;
-extern const char *virtio_balloon_devaddr;
 extern int smp_cpus;
 extern int max_cpus;
 extern int cursor_hide;
diff --git a/vl.c b/vl.c
index cd0f907b31..a89428573b 100644
--- a/vl.c
+++ b/vl.c
@@ -222,8 +222,6 @@ int smp_threads = 1;
 const char *vnc_display;
 int acpi_enabled = 1;
 int no_hpet = 0;
-int virtio_balloon = 1;
-const char *virtio_balloon_devaddr;
 int fd_bootchk = 1;
 int no_reboot = 0;
 int no_shutdown = 0;
@@ -4586,23 +4584,27 @@ static void select_vgahw (const char *p)
 #ifdef TARGET_I386
 static int balloon_parse(const char *arg)
 {
-    char buf[128];
-    const char *p;
+    QemuOpts *opts;
 
-    if (!strcmp(arg, "none")) {
-        virtio_balloon = 0;
-    } else if (!strncmp(arg, "virtio", 6)) {
-        virtio_balloon = 1;
-        if (arg[6] == ',')  {
-            p = arg + 7;
-            if (get_param_value(buf, sizeof(buf), "addr", p)) {
-                virtio_balloon_devaddr = strdup(buf);
-            }
+    if (strcmp(arg, "none") == 0) {
+        return 0;
+    }
+
+    if (!strncmp(arg, "virtio", 6)) {
+        if (arg[6] == ',') {
+            /* have params -> parse them */
+            opts = qemu_opts_parse(&qemu_device_opts, arg+7, NULL);
+            if (!opts)
+                return  -1;
+        } else {
+            /* create empty opts */
+            opts = qemu_opts_create(&qemu_device_opts, NULL, 0);
         }
-    } else {
-        return -1;
+        qemu_opt_set(opts, "driver", "virtio-balloon-pci");
+        return 0;
     }
-    return 0;
+
+    return -1;
 }
 #endif