diff --git a/monitor.c b/monitor.c
index 22360fce3034cfc66783f00c2c840ea9b0038fb4..a928c3eb0de255e6332a072976ba3245d4d9c383 100644
--- a/monitor.c
+++ b/monitor.c
@@ -34,6 +34,7 @@
 #include "block.h"
 #include "audio/audio.h"
 #include "disas.h"
+#include "balloon.h"
 #include <dirent.h>
 #include "qemu-timer.h"
 #include "migration.h"
@@ -1390,6 +1391,23 @@ static void do_inject_nmi(int cpu_index)
 }
 #endif
 
+static void do_balloon(int value)
+{
+    ram_addr_t target = value;
+    qemu_balloon(target << 20);
+}
+
+static void do_info_balloon(void)
+{
+    ram_addr_t actual;
+
+    actual = qemu_balloon_status();
+    if (actual == 0)
+        term_printf("Ballooning not activated in VM\n");
+    else
+        term_printf("balloon: actual=%d\n", (int)(actual >> 20));
+}
+
 static const term_cmd_t term_cmds[] = {
     { "help|?", "s?", do_help,
       "[cmd]", "show the help" },
@@ -1475,6 +1493,8 @@ static const term_cmd_t term_cmds[] = {
       "", "cancel the current VM migration" },
     { "migrate_set_speed", "s", do_migrate_set_speed,
       "value", "set maximum speed (in bytes) for migrations" },
+    { "balloon", "i", do_balloon,
+      "target", "request VM to change it's memory allocation (in MB)" },
     { NULL, NULL, },
 };
 
@@ -1542,6 +1562,8 @@ static const term_cmd_t info_cmds[] = {
       "", "show SLIRP statistics", },
 #endif
     { "migrate", "", do_info_migrate, "", "show migration status" },
+    { "balloon", "", do_info_balloon,
+      "", "show balloon information" },
     { NULL, NULL, },
 };
 
diff --git a/vl.c b/vl.c
index 2b5366e7ec684de303c9485249e2e171f619cc99..1cee2a793f4ea909d2db04ec4062115d51dabe79 100644
--- a/vl.c
+++ b/vl.c
@@ -40,6 +40,7 @@
 #include "audio/audio.h"
 #include "migration.h"
 #include "kvm.h"
+#include "balloon.h"
 
 #include <unistd.h>
 #include <fcntl.h>
@@ -514,6 +515,31 @@ void hw_error(const char *fmt, ...)
     va_end(ap);
     abort();
 }
+ 
+/***************/
+/* ballooning */
+
+static QEMUBalloonEvent *qemu_balloon_event;
+void *qemu_balloon_event_opaque;
+
+void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
+{
+    qemu_balloon_event = func;
+    qemu_balloon_event_opaque = opaque;
+}
+
+void qemu_balloon(ram_addr_t target)
+{
+    if (qemu_balloon_event)
+        qemu_balloon_event(qemu_balloon_event_opaque, target);
+}
+
+ram_addr_t qemu_balloon_status(void)
+{
+    if (qemu_balloon_event)
+        return qemu_balloon_event(qemu_balloon_event_opaque, 0);
+    return 0;
+}
 
 /***********************************************************/
 /* keyboard/mouse */