diff --git a/Makefile.objs b/Makefile.objs
index 70c5c79..5850762 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -210,6 +210,7 @@ user-obj-y += $(qom-obj-twice-y)
 hw-obj-y =
 hw-obj-y += vl.o loader.o
 hw-obj-$(CONFIG_VIRTIO) += virtio-console.o
+hw-obj-$(CONFIG_VIRTIO) += virtio-rng.o
 hw-obj-y += usb/libhw.o
 hw-obj-$(CONFIG_VIRTIO_PCI) += virtio-pci.o
 hw-obj-y += fw_cfg.o
diff --git a/hw/pci.h b/hw/pci.h
index 8d0aa49..0a22f91 100644
--- a/hw/pci.h
+++ b/hw/pci.h
@@ -76,6 +76,7 @@
 #define PCI_DEVICE_ID_VIRTIO_BALLOON     0x1002
 #define PCI_DEVICE_ID_VIRTIO_CONSOLE     0x1003
 #define PCI_DEVICE_ID_VIRTIO_SCSI        0x1004
+#define PCI_DEVICE_ID_VIRTIO_RNG         0x1005
 
 #define FMT_PCIBUS                      PRIx64
 
diff --git a/hw/s390-virtio-bus.c b/hw/s390-virtio-bus.c
index 1d38a8f..e75711e 100644
--- a/hw/s390-virtio-bus.c
+++ b/hw/s390-virtio-bus.c
@@ -26,6 +26,7 @@
 #include "loader.h"
 #include "elf.h"
 #include "hw/virtio.h"
+#include "hw/virtio-rng.h"
 #include "hw/virtio-serial.h"
 #include "hw/virtio-net.h"
 #include "hw/sysbus.h"
@@ -204,6 +205,18 @@ static int s390_virtio_scsi_init(VirtIOS390Device *dev)
     return s390_virtio_device_init(dev, vdev);
 }
 
+static int s390_virtio_rng_init(VirtIOS390Device *dev)
+{
+    VirtIODevice *vdev;
+
+    vdev = virtio_rng_init((DeviceState *)dev, &dev->rng);
+    if (!vdev) {
+        return -1;
+    }
+
+    return s390_virtio_device_init(dev, vdev);
+}
+
 static uint64_t s390_virtio_device_vq_token(VirtIOS390Device *dev, int vq)
 {
     ram_addr_t token_off;
@@ -445,6 +458,27 @@ static TypeInfo s390_virtio_serial = {
     .class_init    = s390_virtio_serial_class_init,
 };
 
+static Property s390_virtio_rng_properties[] = {
+    DEFINE_PROP_CHR("chardev", VirtIOS390Device, rng.chr),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void s390_virtio_rng_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtIOS390DeviceClass *k = VIRTIO_S390_DEVICE_CLASS(klass);
+
+    k->init = s390_virtio_rng_init;
+    dc->props = s390_virtio_rng_properties;
+}
+
+static TypeInfo s390_virtio_rng = {
+    .name          = "virtio-rng-s390",
+    .parent        = TYPE_VIRTIO_S390_DEVICE,
+    .instance_size = sizeof(VirtIOS390Device),
+    .class_init    = s390_virtio_rng_class_init,
+};
+
 static int s390_virtio_busdev_init(DeviceState *dev)
 {
     VirtIOS390Device *_dev = (VirtIOS390Device *)dev;
@@ -524,6 +558,7 @@ static void s390_virtio_register_types(void)
     type_register_static(&s390_virtio_blk);
     type_register_static(&s390_virtio_net);
     type_register_static(&s390_virtio_scsi);
+    type_register_static(&s390_virtio_rng);
     type_register_static(&s390_virtio_bridge_info);
 }
 
diff --git a/hw/s390-virtio-bus.h b/hw/s390-virtio-bus.h
index 4b99d02..5fc53b3 100644
--- a/hw/s390-virtio-bus.h
+++ b/hw/s390-virtio-bus.h
@@ -19,6 +19,7 @@
 
 #include "virtio-blk.h"
 #include "virtio-net.h"
+#include "virtio-rng.h"
 #include "virtio-serial.h"
 #include "virtio-scsi.h"
 
@@ -71,6 +72,7 @@ struct VirtIOS390Device {
     virtio_serial_conf serial;
     virtio_net_conf net;
     VirtIOSCSIConf scsi;
+    VirtIORNGConf rng;
 };
 
 typedef struct VirtIOS390Bus {
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 79b86f1..bd5851e 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -810,6 +810,28 @@ static int virtio_balloon_exit_pci(PCIDevice *pci_dev)
     return virtio_exit_pci(pci_dev);
 }
 
+static int virtio_rng_init_pci(PCIDevice *pci_dev)
+{
+    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
+    VirtIODevice *vdev;
+
+    vdev = virtio_rng_init(&pci_dev->qdev, &proxy->rng);
+    if (!vdev) {
+        return -1;
+    }
+    virtio_init_pci(proxy, vdev);
+    return 0;
+}
+
+static int virtio_rng_exit_pci(PCIDevice *pci_dev)
+{
+    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
+
+    virtio_pci_stop_ioeventfd(proxy);
+    virtio_rng_exit(proxy->vdev);
+    return virtio_exit_pci(pci_dev);
+}
+
 static Property virtio_blk_properties[] = {
     DEFINE_PROP_HEX32("class", VirtIOPCIProxy, class_code, 0),
     DEFINE_BLOCK_PROPERTIES(VirtIOPCIProxy, blk.conf),
@@ -938,6 +960,34 @@ static TypeInfo virtio_balloon_info = {
     .class_init    = virtio_balloon_class_init,
 };
 
+static Property virtio_rng_properties[] = {
+    DEFINE_VIRTIO_COMMON_FEATURES(VirtIOPCIProxy, host_features),
+    DEFINE_PROP_CHR("chardev", VirtIOPCIProxy, rng.chr),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtio_rng_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
+
+    k->init = virtio_rng_init_pci;
+    k->exit = virtio_rng_exit_pci;
+    k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
+    k->device_id = PCI_DEVICE_ID_VIRTIO_RNG;
+    k->revision = VIRTIO_PCI_ABI_VERSION;
+    k->class_id = PCI_CLASS_OTHERS;
+    dc->reset = virtio_pci_reset;
+    dc->props = virtio_rng_properties;
+}
+
+static TypeInfo virtio_rng_info = {
+    .name          = "virtio-rng-pci",
+    .parent        = TYPE_PCI_DEVICE,
+    .instance_size = sizeof(VirtIOPCIProxy),
+    .class_init    = virtio_rng_class_init,
+};
+
 static int virtio_scsi_init_pci(PCIDevice *pci_dev)
 {
     VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
@@ -999,6 +1049,7 @@ static void virtio_pci_register_types(void)
     type_register_static(&virtio_serial_info);
     type_register_static(&virtio_balloon_info);
     type_register_static(&virtio_scsi_info);
+    type_register_static(&virtio_rng_info);
 }
 
 type_init(virtio_pci_register_types)
diff --git a/hw/virtio-pci.h b/hw/virtio-pci.h
index 889e59e..cc3f828 100644
--- a/hw/virtio-pci.h
+++ b/hw/virtio-pci.h
@@ -17,6 +17,7 @@
 
 #include "virtio-blk.h"
 #include "virtio-net.h"
+#include "virtio-rng.h"
 #include "virtio-serial.h"
 #include "virtio-scsi.h"
 
@@ -42,6 +43,7 @@ typedef struct {
     virtio_serial_conf serial;
     virtio_net_conf net;
     VirtIOSCSIConf scsi;
+    VirtIORNGConf rng;
     bool ioeventfd_disabled;
     bool ioeventfd_started;
 } VirtIOPCIProxy;
diff --git a/hw/virtio-rng.c b/hw/virtio-rng.c
new file mode 100644
index 0000000..f4f9078
--- /dev/null
+++ b/hw/virtio-rng.c
@@ -0,0 +1,199 @@
+/*
+ * A virtio device implementing a hardware random number generator.
+ *
+ * Copyright 2012 Red Hat, Inc.
+ * Copyright 2012 Amit Shah <amit.shah@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+
+#include "iov.h"
+#include "qdev.h"
+#include "qjson.h"
+#include "virtio.h"
+#include "virtio-rng.h"
+
+typedef struct VirtIORNG {
+    VirtIODevice vdev;
+
+    DeviceState *qdev;
+
+    /* Only one vq - guest puts buffer(s) on it when it needs entropy */
+    VirtQueue *vq;
+    VirtQueueElement elem;
+
+    /* Config data for the device -- currently only chardev */
+    VirtIORNGConf *conf;
+
+    /* Whether we've popped a vq element into 'elem' above */
+    bool popped;
+} VirtIORNG;
+
+static bool is_guest_ready(VirtIORNG *vrng)
+{
+    if (virtio_queue_ready(vrng->vq)
+        && (vrng->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+        return true;
+    }
+    return false;
+}
+
+static void send_qevent_for_entropy(size_t size)
+{
+    QObject *data;
+
+    data = qobject_from_jsonf("{ 'bytes': %" PRId64 " }",
+                              size);
+    monitor_protocol_event(QEVENT_ENTROPY_NEEDED, data);
+    qobject_decref(data);
+}
+
+static size_t pop_an_elem(VirtIORNG *vrng)
+{
+    size_t size;
+
+    if (!vrng->popped && !virtqueue_pop(vrng->vq, &vrng->elem)) {
+        return 0;
+    }
+    vrng->popped = true;
+
+    size = iov_size(vrng->elem.in_sg, vrng->elem.in_num);
+    return size;
+}
+
+static void handle_input(VirtIODevice *vdev, VirtQueue *vq)
+{
+    VirtIORNG *vrng = DO_UPCAST(VirtIORNG, vdev, vdev);
+    size_t size;
+
+    size = pop_an_elem(vrng);
+    if (size) {
+        send_qevent_for_entropy(size);
+    }
+}
+
+static int chr_can_read(void *opaque)
+{
+    VirtIORNG *vrng = opaque;
+
+    if (!is_guest_ready(vrng)) {
+        return 0;
+    }
+    return pop_an_elem(vrng);
+}
+
+/* Send data from a char device over to the guest */
+static void chr_read(void *opaque, const uint8_t *buf, int size)
+{
+    VirtIORNG *vrng = opaque;
+    size_t len;
+    int offset;
+
+    if (!is_guest_ready(vrng)) {
+        return;
+    }
+
+    offset = 0;
+    while (offset < size) {
+        if (!pop_an_elem(vrng)) {
+            break;
+        }
+        len = iov_from_buf(vrng->elem.in_sg, vrng->elem.in_num,
+                           buf + offset, 0, size - offset);
+        offset += len;
+
+        virtqueue_push(vrng->vq, &vrng->elem, len);
+        vrng->popped = false;
+    }
+    virtio_notify(&vrng->vdev, vrng->vq);
+
+    /*
+     * Lastly, if we had multiple elems queued by the guest, and we
+     * didn't have enough data to fill them all, indicate we want more
+     * data.  We can't stick this into chr_can_read(), as it'll just
+     * end up spamming the management app.
+     */
+    len = pop_an_elem(vrng);
+    if (len) {
+        send_qevent_for_entropy(len);
+    }
+}
+
+static uint32_t get_features(VirtIODevice *vdev, uint32_t f)
+{
+    return f;
+}
+
+static void virtio_rng_save(QEMUFile *f, void *opaque)
+{
+    VirtIORNG *vrng = opaque;
+
+    virtio_save(&vrng->vdev, f);
+
+    qemu_put_byte(f, vrng->popped);
+    if (vrng->popped) {
+        qemu_put_buffer(f, (unsigned char *)&vrng->elem,
+                        sizeof(vrng->elem));
+    }
+}
+
+static int virtio_rng_load(QEMUFile *f, void *opaque, int version_id)
+{
+    VirtIORNG *vrng = opaque;
+
+    if (version_id != 1) {
+        return -EINVAL;
+    }
+    virtio_load(&vrng->vdev, f);
+
+    vrng->popped = qemu_get_byte(f);
+    if (vrng->popped) {
+        qemu_get_buffer(f, (unsigned char *)&vrng->elem,
+                        sizeof(vrng->elem));
+        virtqueue_map_sg(vrng->elem.in_sg, vrng->elem.in_addr,
+                         vrng->elem.in_num, 1);
+        virtqueue_map_sg(vrng->elem.out_sg, vrng->elem.out_addr,
+                         vrng->elem.out_num, 0);
+    }
+    return 0;
+}
+
+VirtIODevice *virtio_rng_init(DeviceState *dev, VirtIORNGConf *conf)
+{
+    VirtIORNG *vrng;
+    VirtIODevice *vdev;
+
+    if (!conf->chr) {
+        error_report("chardev property expected");
+        return NULL;
+    }
+
+    vdev = virtio_common_init("virtio-rng", VIRTIO_ID_RNG, 0,
+                              sizeof(VirtIORNG));
+
+    vrng = DO_UPCAST(VirtIORNG, vdev, vdev);
+
+    vrng->vq = virtio_add_queue(vdev, 8, handle_input);
+    vrng->vdev.get_features = get_features;
+
+    vrng->qdev = dev;
+    vrng->conf = conf;
+    vrng->popped = false;
+    register_savevm(dev, "virtio-rng", -1, 1, virtio_rng_save,
+                    virtio_rng_load, vrng);
+
+    qemu_chr_add_handlers(conf->chr, chr_can_read, chr_read, NULL, vrng);
+
+    return vdev;
+}
+
+void virtio_rng_exit(VirtIODevice *vdev)
+{
+    VirtIORNG *vrng = DO_UPCAST(VirtIORNG, vdev, vdev);
+
+    qemu_chr_add_handlers(vrng->conf->chr, NULL, NULL, NULL, NULL);
+    unregister_savevm(vrng->qdev, "virtio-rng", vrng);
+    virtio_cleanup(vdev);
+}
diff --git a/hw/virtio-rng.h b/hw/virtio-rng.h
new file mode 100644
index 0000000..b132acd
--- /dev/null
+++ b/hw/virtio-rng.h
@@ -0,0 +1,24 @@
+/*
+ * Virtio RNG Support
+ *
+ * Copyright Red Hat, Inc. 2012
+ * Copyright Amit Shah <amit.shah@redhat.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or
+ * (at your option) any later version.  See the COPYING file in the
+ * top-level directory.
+ */
+
+#ifndef _QEMU_VIRTIO_RNG_H
+#define _QEMU_VIRTIO_RNG_H
+
+#include "qemu-char.h"
+
+/* The Virtio ID for the virtio rng device */
+#define VIRTIO_ID_RNG    4
+
+struct VirtIORNGConf {
+    CharDriverState *chr;
+};
+
+#endif
diff --git a/hw/virtio.h b/hw/virtio.h
index 85aabe5..b4b5bf6 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -201,6 +201,8 @@ VirtIODevice *virtio_serial_init(DeviceState *dev, virtio_serial_conf *serial);
 VirtIODevice *virtio_balloon_init(DeviceState *dev);
 typedef struct VirtIOSCSIConf VirtIOSCSIConf;
 VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *conf);
+typedef struct VirtIORNGConf VirtIORNGConf;
+VirtIODevice *virtio_rng_init(DeviceState *dev, VirtIORNGConf *conf);
 #ifdef CONFIG_LINUX
 VirtIODevice *virtio_9p_init(DeviceState *dev, V9fsConf *conf);
 #endif
@@ -211,6 +213,7 @@ void virtio_blk_exit(VirtIODevice *vdev);
 void virtio_serial_exit(VirtIODevice *vdev);
 void virtio_balloon_exit(VirtIODevice *vdev);
 void virtio_scsi_exit(VirtIODevice *vdev);
+void virtio_rng_exit(VirtIODevice *vdev);
 
 #define DEFINE_VIRTIO_COMMON_FEATURES(_state, _field) \
 	DEFINE_PROP_BIT("indirect_desc", _state, _field, \
diff --git a/monitor.c b/monitor.c
index 12a6fe2..177b73e 100644
--- a/monitor.c
+++ b/monitor.c
@@ -493,6 +493,9 @@ void monitor_protocol_event(MonitorEvent event, QObject *data)
         case QEVENT_WAKEUP:
             event_name = "WAKEUP";
             break;
+        case QEVENT_ENTROPY_NEEDED:
+            event_name = "ENTROPY_NEEDED";
+            break;
         default:
             abort();
             break;
diff --git a/monitor.h b/monitor.h
index 0d49800..731d599 100644
--- a/monitor.h
+++ b/monitor.h
@@ -41,6 +41,7 @@ typedef enum MonitorEvent {
     QEVENT_DEVICE_TRAY_MOVED,
     QEVENT_SUSPEND,
     QEVENT_WAKEUP,
+    QEVENT_ENTROPY_NEEDED,
     QEVENT_MAX,
 } MonitorEvent;
 
