balloon: Fix overflow when reporting actual memory size

Beginning with its introduction, the virtio balloon has had an overflow error
that causes 'info balloon' to misreport the actual memory size when the balloon
itself becomes larger than 4G.  Use a cast when converting dev->actual from
pages to kB to prevent overflows.

Before:
(qemu) info balloon
balloon: actual=5120
(qemu) balloon 1025
(qemu) info balloon
balloon: actual=1025
(qemu) balloon 1024
(qemu) info balloon
balloon: actual=5120

After:
(qemu) info balloon
balloon: actual=5120
(qemu) balloon 1025
(qemu) info balloon
balloon: actual=1025
(qemu) balloon 1024
(qemu) info balloon
balloon: actual=1024
Signed-off-by: NAdam Litke <agl@us.ibm.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

hw/virtio-balloon.c

@@ -78,7 +78,8 @@ static void stat_put(QDict *dict, const char *label, uint64_t val)
 static QObject *get_stats_qobject(VirtIOBalloon *dev)
 {
     QDict *dict = qdict_new();
-    uint32_t actual = ram_size - (dev->actual << VIRTIO_BALLOON_PFN_SHIFT);
+    uint64_t actual = ram_size - ((uint64_t) dev->actual <<
+                                  VIRTIO_BALLOON_PFN_SHIFT);
 
     stat_put(dict, "actual", actual);
     stat_put(dict, "mem_swapped_in", dev->stats[VIRTIO_BALLOON_S_SWAP_IN]);