diff --git a/balloon.c b/balloon.c
index f2ef50c..0fb34bf 100644
--- a/balloon.c
+++ b/balloon.c
@@ -36,6 +36,7 @@
 
 static QEMUBalloonEvent *balloon_event_fn;
 static QEMUBalloonStatus *balloon_stat_fn;
+static QEMUBalloonDropCache *balloon_drop_cache_fn;
 static void *balloon_opaque;
 static bool balloon_inhibited;
 
@@ -65,9 +66,12 @@ static bool have_balloon(Error **errp)
 }
 
 int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
-                             QEMUBalloonStatus *stat_func, void *opaque)
+                             QEMUBalloonStatus *stat_func,
+                             QEMUBalloonDropCache *drop_cache_func,
+                             void *opaque)
 {
-    if (balloon_event_fn || balloon_stat_fn || balloon_opaque) {
+    if (balloon_event_fn || balloon_stat_fn || balloon_drop_cache_fn
+        || balloon_opaque) {
         /* We're already registered one balloon handler.  How many can
          * a guest really have?
          */
@@ -75,6 +79,7 @@ int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
     }
     balloon_event_fn = event_func;
     balloon_stat_fn = stat_func;
+    balloon_drop_cache_fn = drop_cache_func;
     balloon_opaque = opaque;
     return 0;
 }
@@ -86,6 +91,7 @@ void qemu_remove_balloon_handler(void *opaque)
     }
     balloon_event_fn = NULL;
     balloon_stat_fn = NULL;
+    balloon_drop_cache_fn = NULL;
     balloon_opaque = NULL;
 }
 
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 8cf74c2..4757ba5 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -36,6 +36,10 @@
 
 #define BALLOON_PAGE_SIZE  (1 << VIRTIO_BALLOON_PFN_SHIFT)
 
+enum balloon_req_id {
+       BALLOON_DROP_CACHE,
+};
+
 static void balloon_page(void *addr, int deflate)
 {
 #if defined(__linux__)
@@ -154,6 +158,12 @@ static bool balloon_page_bitmap_supported(const VirtIOBalloon *s)
     return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_PAGE_BITMAP);
 }
 
+static bool balloon_misc_supported(const VirtIOBalloon *s)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(s);
+    return virtio_vdev_has_feature(vdev, VIRTIO_BALLOON_F_MISC);
+}
+
 static bool balloon_stats_enabled(const VirtIOBalloon *s)
 {
     return s->stats_poll_interval > 0;
@@ -420,6 +430,39 @@ out:
     }
 }
 
+static void virtio_balloon_handle_resp(VirtIODevice *vdev, VirtQueue *vq)
+{
+    VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
+    VirtQueueElement *elem;
+    size_t offset = 0;
+    uint32_t tmp32, id = 0;
+
+    elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
+    if (!elem) {
+        s->req_status = REQ_ERROR;
+        return;
+    }
+
+    s->misc_vq_elem = elem;
+
+    if (!elem->out_num) {
+        return;
+    }
+
+    iov_to_buf(elem->out_sg, elem->out_num, offset,
+               &tmp32, sizeof(uint32_t));
+    id = virtio_ldl_p(vdev, &tmp32);
+    offset += sizeof(uint32_t);
+    switch (id) {
+    case BALLOON_DROP_CACHE:
+        s->req_status = REQ_DONE;
+        break;
+    default:
+        break;
+    }
+
+}
+
 static void virtio_balloon_get_config(VirtIODevice *vdev, uint8_t *config_data)
 {
     VirtIOBalloon *dev = VIRTIO_BALLOON(vdev);
@@ -490,6 +533,7 @@ static uint64_t virtio_balloon_get_features(VirtIODevice *vdev, uint64_t f,
     f |= dev->host_features;
     virtio_add_feature(&f, VIRTIO_BALLOON_F_STATS_VQ);
     virtio_add_feature(&f, VIRTIO_BALLOON_F_PAGE_BITMAP);
+    virtio_add_feature(&f, VIRTIO_BALLOON_F_MISC);
     return f;
 }
 
@@ -500,6 +544,36 @@ static void virtio_balloon_stat(void *opaque, BalloonInfo *info)
                                              VIRTIO_BALLOON_PFN_SHIFT);
 }
 
+static int virtio_balloon_drop_cache(void *opaque, unsigned long type)
+{
+    VirtIOBalloon *s = opaque;
+    VirtIODevice *vdev = VIRTIO_DEVICE(s);
+    VirtQueueElement *elem = s->misc_vq_elem;
+    int len;
+
+    if (!balloon_misc_supported(s)) {
+        return REQ_UNSUPPORT;
+    }
+
+    if (elem == NULL || !elem->in_num) {
+        elem = virtqueue_pop(s->mvq, sizeof(VirtQueueElement));
+        if (!elem) {
+            return REQ_ERROR;
+        }
+        s->misc_vq_elem = elem;
+    }
+    s->misc_req.id = BALLOON_DROP_CACHE;
+    s->misc_req.param = type;
+    len = iov_from_buf(elem->in_sg, elem->in_num, 0, &s->misc_req,
+                       sizeof(s->misc_req));
+    virtqueue_push(s->mvq, elem, len);
+    virtio_notify(vdev, s->mvq);
+    g_free(s->misc_vq_elem);
+    s->misc_vq_elem = NULL;
+
+    return REQ_DONE;
+}
+
 static void virtio_balloon_to_target(void *opaque, ram_addr_t target)
 {
     VirtIOBalloon *dev = VIRTIO_BALLOON(opaque);
@@ -562,7 +636,8 @@ static void virtio_balloon_device_realize(DeviceState *dev, Error **errp)
                 sizeof(struct virtio_balloon_config));
 
     ret = qemu_add_balloon_handler(virtio_balloon_to_target,
-                                   virtio_balloon_stat, s);
+                                   virtio_balloon_stat,
+                                   virtio_balloon_drop_cache, s);
 
     if (ret < 0) {
         error_setg(errp, "Only one balloon device is supported");
@@ -573,8 +648,10 @@ static void virtio_balloon_device_realize(DeviceState *dev, Error **errp)
     s->ivq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output);
     s->dvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output);
     s->svq = virtio_add_queue(vdev, 128, virtio_balloon_receive_stats);
+    s->mvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_resp);
 
     reset_stats(s);
+    s->req_status = REQ_INIT;
 
     register_savevm(dev, "virtio-balloon", -1, 1,
                     virtio_balloon_save, virtio_balloon_load, s);
@@ -599,6 +676,12 @@ static void virtio_balloon_device_reset(VirtIODevice *vdev)
         g_free(s->stats_vq_elem);
         s->stats_vq_elem = NULL;
     }
+
+    if (s->misc_vq_elem != NULL) {
+        g_free(s->misc_vq_elem);
+        s->misc_vq_elem = NULL;
+    }
+    s->req_status = REQ_INIT;
 }
 
 static void virtio_balloon_instance_init(Object *obj)
diff --git a/include/hw/virtio/virtio-balloon.h b/include/hw/virtio/virtio-balloon.h
index 35f62ac..a21bb45 100644
--- a/include/hw/virtio/virtio-balloon.h
+++ b/include/hw/virtio/virtio-balloon.h
@@ -23,6 +23,20 @@
 #define VIRTIO_BALLOON(obj) \
         OBJECT_CHECK(VirtIOBalloon, (obj), TYPE_VIRTIO_BALLOON)
 
+typedef enum {
+    REQ_INIT,
+    REQ_ON_GOING,
+    REQ_DONE,
+    REQ_ERROR,
+    REQ_INVALID_PARAM,
+    REQ_UNSUPPORT,
+} BalloonReqStatus;
+
+typedef struct GetFreePageReq {
+    uint32_t id;
+    uint32_t param;
+} MiscReq;
+
 typedef struct virtio_balloon_stat VirtIOBalloonStat;
 
 typedef struct virtio_balloon_stat_modern {
@@ -33,16 +47,19 @@ typedef struct virtio_balloon_stat_modern {
 
 typedef struct VirtIOBalloon {
     VirtIODevice parent_obj;
-    VirtQueue *ivq, *dvq, *svq;
+    VirtQueue *ivq, *dvq, *svq, *mvq;
     uint32_t num_pages;
     uint32_t actual;
     uint64_t stats[VIRTIO_BALLOON_S_NR];
     VirtQueueElement *stats_vq_elem;
+    VirtQueueElement *misc_vq_elem;
     size_t stats_vq_offset;
     QEMUTimer *stats_timer;
     int64_t stats_last_update;
     int64_t stats_poll_interval;
     uint32_t host_features;
+    MiscReq misc_req;
+    BalloonReqStatus req_status;
 } VirtIOBalloon;
 
 #endif
diff --git a/include/standard-headers/linux/virtio_balloon.h b/include/standard-headers/linux/virtio_balloon.h
index 7c9686c..c8b254f 100644
--- a/include/standard-headers/linux/virtio_balloon.h
+++ b/include/standard-headers/linux/virtio_balloon.h
@@ -35,6 +35,7 @@
 #define VIRTIO_BALLOON_F_STATS_VQ	1 /* Memory Stats virtqueue */
 #define VIRTIO_BALLOON_F_DEFLATE_ON_OOM	2 /* Deflate balloon on OOM */
 #define VIRTIO_BALLOON_F_PAGE_BITMAP  3 /* Use page bitmap to send page info */
+#define VIRTIO_BALLOON_F_MISC    4 /* Send request and get misc info */
 
 /* Size of a PFN in the balloon interface. */
 #define VIRTIO_BALLOON_PFN_SHIFT 12
diff --git a/include/sysemu/balloon.h b/include/sysemu/balloon.h
index 3f976b4..0e85f2b 100644
--- a/include/sysemu/balloon.h
+++ b/include/sysemu/balloon.h
@@ -18,9 +18,12 @@
 
 typedef void (QEMUBalloonEvent)(void *opaque, ram_addr_t target);
 typedef void (QEMUBalloonStatus)(void *opaque, BalloonInfo *info);
+typedef int (QEMUBalloonDropCache)(void *opaque, unsigned long ctrl);
 
 int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
-			     QEMUBalloonStatus *stat_func, void *opaque);
+                             QEMUBalloonStatus *stat_func,
+                             QEMUBalloonDropCache *drop_cache_func,
+                             void *opaque);
 void qemu_remove_balloon_handler(void *opaque);
 bool qemu_balloon_is_inhibited(void);
 void qemu_balloon_inhibit(bool state);
