diff --git a/QMP/qmp-shell b/QMP/qmp-shell
index 24b665c..d126e63 100755
--- a/QMP/qmp-shell
+++ b/QMP/qmp-shell
@@ -101,7 +101,12 @@
             try:
                 value = int(opt[1])
             except ValueError:
-                value = opt[1]
+                if opt[1] == 'true':
+                    value = True
+                elif opt[1] == 'false':
+                    value = False
+                else:
+                    value = opt[1]
             qmpcmd['arguments'][opt[0]] = value
         return qmpcmd
 
diff --git a/hmp-commands.hx b/hmp-commands.hx
index df44906..3d98604 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1643,6 +1643,8 @@
 show roms
 @item info tpm
 show the TPM device
+@item info cpu_max
+show the number of CPUs supported by the machine being emulated.
 @end table
 ETEXI
 
diff --git a/hmp.c b/hmp.c
index e3e833e..dbe9b90 100644
--- a/hmp.c
+++ b/hmp.c
@@ -633,11 +633,11 @@
                        c, TpmModel_lookup[ti->model]);
 
         monitor_printf(mon, "  \\ %s: type=%s",
-                       ti->id, TpmType_lookup[ti->type]);
+                       ti->id, TpmTypeOptionsKind_lookup[ti->options->kind]);
 
-        switch (ti->tpm_options->kind) {
-        case TPM_TYPE_OPTIONS_KIND_TPM_PASSTHROUGH_OPTIONS:
-            tpo = ti->tpm_options->tpm_passthrough_options;
+        switch (ti->options->kind) {
+        case TPM_TYPE_OPTIONS_KIND_PASSTHROUGH:
+            tpo = ti->options->passthrough;
             monitor_printf(mon, "%s%s%s%s",
                            tpo->has_path ? ",path=" : "",
                            tpo->has_path ? tpo->path : "",
@@ -750,6 +750,14 @@
     g_free(data);
 }
 
+void hmp_query_cpu_max(Monitor *mon, const QDict *qdict)
+{
+    int cpu_max;
+
+    cpu_max = qmp_query_cpu_max(NULL);
+    monitor_printf(mon, "Maximum number of CPUs is %d\n", cpu_max);
+}
+
 static void hmp_cont_cb(void *opaque, int err)
 {
     if (!err) {
diff --git a/hmp.h b/hmp.h
index 95fe76e..80e8b41 100644
--- a/hmp.h
+++ b/hmp.h
@@ -42,6 +42,7 @@
 void hmp_system_reset(Monitor *mon, const QDict *qdict);
 void hmp_system_powerdown(Monitor *mon, const QDict *qdict);
 void hmp_cpu(Monitor *mon, const QDict *qdict);
+void hmp_query_cpu_max(Monitor *mon, const QDict *qdict);
 void hmp_memsave(Monitor *mon, const QDict *qdict);
 void hmp_pmemsave(Monitor *mon, const QDict *qdict);
 void hmp_ringbuf_write(Monitor *mon, const QDict *qdict);
diff --git a/hw/qdev-addr.c b/hw/qdev-addr.c
index 2398b4a..80a38bb 100644
--- a/hw/qdev-addr.c
+++ b/hw/qdev-addr.c
@@ -42,7 +42,7 @@
     int64_t value;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
diff --git a/hw/qdev-properties-system.c b/hw/qdev-properties-system.c
index 8795144..28813d3 100644
--- a/hw/qdev-properties-system.c
+++ b/hw/qdev-properties-system.c
@@ -43,7 +43,7 @@
     int ret;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -287,7 +287,7 @@
     NetClientState *hubport;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
index 247ca6c..168c466 100644
--- a/hw/qdev-properties.c
+++ b/hw/qdev-properties.c
@@ -7,6 +7,20 @@
 #include "qapi/visitor.h"
 #include "char/char.h"
 
+void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
+                                  Error **errp)
+{
+    if (dev->id) {
+        error_setg(errp, "Attempt to set property '%s' on device '%s' "
+                   "(type '%s') after it was realized", name, dev->id,
+                   object_get_typename(OBJECT(dev)));
+    } else {
+        error_setg(errp, "Attempt to set property '%s' on anonymous device "
+                   "(type '%s') after it was realized", name,
+                   object_get_typename(OBJECT(dev)));
+    }
+}
+
 void *qdev_get_prop_ptr(DeviceState *dev, Property *prop)
 {
     void *ptr = dev;
@@ -33,7 +47,7 @@
     int *ptr = qdev_get_prop_ptr(dev, prop);
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -86,7 +100,7 @@
     bool value;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -126,7 +140,7 @@
     uint8_t *ptr = qdev_get_prop_ptr(dev, prop);
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -193,7 +207,7 @@
     uint16_t *ptr = qdev_get_prop_ptr(dev, prop);
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -226,7 +240,7 @@
     uint32_t *ptr = qdev_get_prop_ptr(dev, prop);
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -251,7 +265,7 @@
     int32_t *ptr = qdev_get_prop_ptr(dev, prop);
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -324,7 +338,7 @@
     uint64_t *ptr = qdev_get_prop_ptr(dev, prop);
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -414,7 +428,7 @@
     char *str;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -478,7 +492,7 @@
     char *str, *p;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -570,7 +584,7 @@
     char *str;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -641,7 +655,7 @@
     const int64_t max = 32768;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -709,7 +723,7 @@
     unsigned int slot = 0, func = 0;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -824,7 +838,7 @@
     int i;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
     if (*alenptr) {
diff --git a/hw/qdev-properties.h b/hw/qdev-properties.h
index c9bb246..a379339 100644
--- a/hw/qdev-properties.h
+++ b/hw/qdev-properties.h
@@ -167,4 +167,16 @@
  */
 void qdev_property_add_static(DeviceState *dev, Property *prop, Error **errp);
 
+/**
+ * @qdev_prop_set_after_realize:
+ * @dev: device
+ * @name: name of property
+ * @errp: indirect pointer to Error to be set
+ * Set the Error object to report that an attempt was made to set a property
+ * on a device after it has already been realized. This is a utility function
+ * which allows property-setter functions to easily report the error in
+ * a friendly format identifying both the device and the property.
+ */
+void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
+                                 Error **errp);
 #endif
diff --git a/hw/qdev.c b/hw/qdev.c
index 708a058..6b1947e 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -562,7 +562,7 @@
     int ret;
 
     if (dev->realized) {
-        error_set(errp, QERR_PERMISSION_DENIED);
+        qdev_prop_set_after_realize(dev, name, errp);
         return;
     }
 
@@ -710,6 +710,7 @@
     DeviceState *dev = DEVICE(obj);
     ObjectClass *class;
     Property *prop;
+    Error *err = NULL;
 
     if (qdev_hotplug) {
         dev->hotplugged = 1;
@@ -725,15 +726,18 @@
     class = object_get_class(OBJECT(dev));
     do {
         for (prop = DEVICE_CLASS(class)->props; prop && prop->name; prop++) {
-            qdev_property_add_legacy(dev, prop, NULL);
-            qdev_property_add_static(dev, prop, NULL);
+            qdev_property_add_legacy(dev, prop, &err);
+            assert_no_error(err);
+            qdev_property_add_static(dev, prop, &err);
+            assert_no_error(err);
         }
         class = object_class_get_parent(class);
     } while (class != object_class_by_name(TYPE_DEVICE));
     qdev_prop_set_globals(dev);
 
     object_property_add_link(OBJECT(dev), "parent_bus", TYPE_BUS,
-                             (Object **)&dev->parent_bus, NULL);
+                             (Object **)&dev->parent_bus, &err);
+    assert_no_error(err);
 }
 
 /* Unlink device from bus and free the structure.  */
diff --git a/hw/s390x/s390-virtio-bus.c b/hw/s390x/s390-virtio-bus.c
index c5d5456..8c529c1 100644
--- a/hw/s390x/s390-virtio-bus.c
+++ b/hw/s390x/s390-virtio-bus.c
@@ -202,16 +202,24 @@
     return r;
 }
 
-static int s390_virtio_scsi_init(VirtIOS390Device *dev)
+static int s390_virtio_scsi_init(VirtIOS390Device *s390_dev)
 {
-    VirtIODevice *vdev;
+    VirtIOSCSIS390 *dev = VIRTIO_SCSI_S390(s390_dev);
+    DeviceState *vdev = DEVICE(&dev->vdev);
 
-    vdev = virtio_scsi_init((DeviceState *)dev, &dev->scsi);
-    if (!vdev) {
+    qdev_set_parent_bus(vdev, BUS(&s390_dev->bus));
+    if (qdev_init(vdev) < 0) {
         return -1;
     }
 
-    return s390_virtio_device_init(dev, vdev);
+    return s390_virtio_device_init(s390_dev, VIRTIO_DEVICE(vdev));
+}
+
+static void s390_virtio_scsi_instance_init(Object *obj)
+{
+    VirtIOSCSIS390 *dev = VIRTIO_SCSI_S390(obj);
+    object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_SCSI);
+    object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
 }
 
 static int s390_virtio_rng_init(VirtIOS390Device *dev)
@@ -538,7 +546,8 @@
 };
 
 static Property s390_virtio_scsi_properties[] = {
-    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOS390Device, host_features, scsi),
+    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSIS390, vdev.conf),
+    DEFINE_VIRTIO_SCSI_FEATURES(VirtIOS390Device, host_features),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -552,9 +561,10 @@
 }
 
 static const TypeInfo s390_virtio_scsi = {
-    .name          = "virtio-scsi-s390",
+    .name          = TYPE_VIRTIO_SCSI_S390,
     .parent        = TYPE_VIRTIO_S390_DEVICE,
-    .instance_size = sizeof(VirtIOS390Device),
+    .instance_size = sizeof(VirtIOSCSIS390),
+    .instance_init = s390_virtio_scsi_instance_init,
     .class_init    = s390_virtio_scsi_class_init,
 };
 
diff --git a/hw/s390x/s390-virtio-bus.h b/hw/s390x/s390-virtio-bus.h
index 1a63411..ebe8794 100644
--- a/hw/s390x/s390-virtio-bus.h
+++ b/hw/s390x/s390-virtio-bus.h
@@ -93,7 +93,6 @@
     uint32_t host_features;
     virtio_serial_conf serial;
     virtio_net_conf net;
-    VirtIOSCSIConf scsi;
     VirtIORNGConf rng;
     VirtioBusState bus;
 };
@@ -131,5 +130,15 @@
     VirtIOBlkConf blk;
 } VirtIOBlkS390;
 
+/* virtio-scsi-s390 */
+
+#define TYPE_VIRTIO_SCSI_S390 "virtio-scsi-s390"
+#define VIRTIO_SCSI_S390(obj) \
+        OBJECT_CHECK(VirtIOSCSIS390, (obj), TYPE_VIRTIO_SCSI_S390)
+
+typedef struct VirtIOSCSIS390 {
+    VirtIOS390Device parent_obj;
+    VirtIOSCSI vdev;
+} VirtIOSCSIS390;
 
 #endif
diff --git a/hw/s390x/s390-virtio-ccw.c b/hw/s390x/s390-virtio-ccw.c
index d436414..76b63e2 100644
--- a/hw/s390x/s390-virtio-ccw.c
+++ b/hw/s390x/s390-virtio-ccw.c
@@ -31,6 +31,9 @@
     if (!sch || !css_subch_visible(sch)) {
         return -EINVAL;
     }
+    if (queue >= VIRTIO_PCI_QUEUE_MAX) {
+        return -EINVAL;
+    }
     virtio_queue_notify(virtio_ccw_get_vdev(sch), queue);
     return 0;
 
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 4c44b7e..7e79c57 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -626,22 +626,24 @@
     return virtio_ccw_exit(dev);
 }
 
-static int virtio_ccw_scsi_init(VirtioCcwDevice *dev)
+static int virtio_ccw_scsi_init(VirtioCcwDevice *ccw_dev)
 {
-    VirtIODevice *vdev;
+    VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(ccw_dev);
+    DeviceState *vdev = DEVICE(&dev->vdev);
 
-    vdev = virtio_scsi_init((DeviceState *)dev, &dev->scsi);
-    if (!vdev) {
+    qdev_set_parent_bus(vdev, BUS(&ccw_dev->bus));
+    if (qdev_init(vdev) < 0) {
         return -1;
     }
 
-    return virtio_ccw_device_init(dev, vdev);
+    return virtio_ccw_device_init(ccw_dev, VIRTIO_DEVICE(vdev));
 }
 
-static int virtio_ccw_scsi_exit(VirtioCcwDevice *dev)
+static void virtio_ccw_scsi_instance_init(Object *obj)
 {
-    virtio_scsi_exit(dev->vdev);
-    return virtio_ccw_exit(dev);
+    VirtIOSCSICcw *dev = VIRTIO_SCSI_CCW(obj);
+    object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_SCSI);
+    object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
 }
 
 static int virtio_ccw_rng_init(VirtioCcwDevice *dev)
@@ -832,7 +834,8 @@
 
 static Property virtio_ccw_scsi_properties[] = {
     DEFINE_PROP_STRING("devno", VirtioCcwDevice, bus_id),
-    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtioCcwDevice, host_features[0], scsi),
+    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSICcw, vdev.conf),
+    DEFINE_VIRTIO_SCSI_FEATURES(VirtioCcwDevice, host_features[0]),
     DEFINE_PROP_END_OF_LIST(),
 };
 
@@ -842,15 +845,16 @@
     VirtIOCCWDeviceClass *k = VIRTIO_CCW_DEVICE_CLASS(klass);
 
     k->init = virtio_ccw_scsi_init;
-    k->exit = virtio_ccw_scsi_exit;
+    k->exit = virtio_ccw_exit;
     dc->reset = virtio_ccw_reset;
     dc->props = virtio_ccw_scsi_properties;
 }
 
 static const TypeInfo virtio_ccw_scsi = {
-    .name          = "virtio-scsi-ccw",
+    .name          = TYPE_VIRTIO_SCSI_CCW,
     .parent        = TYPE_VIRTIO_CCW_DEVICE,
-    .instance_size = sizeof(VirtioCcwDevice),
+    .instance_size = sizeof(VirtIOSCSICcw),
+    .instance_init = virtio_ccw_scsi_instance_init,
     .class_init    = virtio_ccw_scsi_class_init,
 };
 
diff --git a/hw/s390x/virtio-ccw.h b/hw/s390x/virtio-ccw.h
index 3993bc5..d9f7399 100644
--- a/hw/s390x/virtio-ccw.h
+++ b/hw/s390x/virtio-ccw.h
@@ -76,7 +76,6 @@
     uint32_t host_features[VIRTIO_CCW_FEATURE_SIZE];
     virtio_serial_conf serial;
     virtio_net_conf net;
-    VirtIOSCSIConf scsi;
     VirtIORNGConf rng;
     VirtioBusState bus;
     /* Guest provided values: */
@@ -93,6 +92,17 @@
 #define VIRTUAL_CSS_BUS(obj) \
      OBJECT_CHECK(VirtualCssBus, (obj), TYPE_VIRTUAL_CSS_BUS)
 
+/* virtio-scsi-ccw */
+
+#define TYPE_VIRTIO_SCSI_CCW "virtio-scsi-ccw"
+#define VIRTIO_SCSI_CCW(obj) \
+        OBJECT_CHECK(VirtIOSCSICcw, (obj), TYPE_VIRTIO_SCSI_CCW)
+
+typedef struct VirtIOSCSICcw {
+    VirtioCcwDevice parent_obj;
+    VirtIOSCSI vdev;
+} VirtIOSCSICcw;
+
 /* virtio-blk-ccw */
 
 #define TYPE_VIRTIO_BLK_CCW "virtio-blk-ccw"
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index f3ece78..668060d 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -1190,63 +1190,6 @@
     .class_init    = virtio_rng_class_init,
 };
 
-static int virtio_scsi_init_pci(PCIDevice *pci_dev)
-{
-    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
-    VirtIODevice *vdev;
-
-    vdev = virtio_scsi_init(&pci_dev->qdev, &proxy->scsi);
-    if (!vdev) {
-        return -EINVAL;
-    }
-
-    vdev->nvectors = proxy->nvectors == DEV_NVECTORS_UNSPECIFIED
-                                        ? proxy->scsi.num_queues + 3
-                                        : proxy->nvectors;
-    virtio_init_pci(proxy, vdev);
-
-    /* make the actual value visible */
-    proxy->nvectors = vdev->nvectors;
-    return 0;
-}
-
-static void virtio_scsi_exit_pci(PCIDevice *pci_dev)
-{
-    VirtIOPCIProxy *proxy = DO_UPCAST(VirtIOPCIProxy, pci_dev, pci_dev);
-
-    virtio_scsi_exit(proxy->vdev);
-    virtio_exit_pci(pci_dev);
-}
-
-static Property virtio_scsi_properties[] = {
-    DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags, VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
-    DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors, DEV_NVECTORS_UNSPECIFIED),
-    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOPCIProxy, host_features, scsi),
-    DEFINE_PROP_END_OF_LIST(),
-};
-
-static void virtio_scsi_class_init(ObjectClass *klass, void *data)
-{
-    DeviceClass *dc = DEVICE_CLASS(klass);
-    PCIDeviceClass *k = PCI_DEVICE_CLASS(klass);
-
-    k->init = virtio_scsi_init_pci;
-    k->exit = virtio_scsi_exit_pci;
-    k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
-    k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
-    k->revision = 0x00;
-    k->class_id = PCI_CLASS_STORAGE_SCSI;
-    dc->reset = virtio_pci_reset;
-    dc->props = virtio_scsi_properties;
-}
-
-static const TypeInfo virtio_scsi_info = {
-    .name          = "virtio-scsi-pci",
-    .parent        = TYPE_PCI_DEVICE,
-    .instance_size = sizeof(VirtIOPCIProxy),
-    .class_init    = virtio_scsi_class_init,
-};
-
 #ifdef CONFIG_VIRTFS
 static int virtio_9p_init_pci(PCIDevice *pci_dev)
 {
@@ -1453,6 +1396,62 @@
     .class_init    = virtio_blk_pci_class_init,
 };
 
+/* virtio-scsi-pci */
+
+static Property virtio_scsi_pci_properties[] = {
+    DEFINE_PROP_BIT("ioeventfd", VirtIOPCIProxy, flags,
+                    VIRTIO_PCI_FLAG_USE_IOEVENTFD_BIT, true),
+    DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
+                       DEV_NVECTORS_UNSPECIFIED),
+    DEFINE_VIRTIO_SCSI_FEATURES(VirtIOPCIProxy, host_features),
+    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSIPCI, vdev.conf),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static int virtio_scsi_pci_init_pci(VirtIOPCIProxy *vpci_dev)
+{
+    VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(vpci_dev);
+    DeviceState *vdev = DEVICE(&dev->vdev);
+
+    if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
+        vpci_dev->nvectors = dev->vdev.conf.num_queues + 3;
+    }
+
+    qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
+    if (qdev_init(vdev) < 0) {
+        return -1;
+    }
+    return 0;
+}
+
+static void virtio_scsi_pci_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
+    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
+    k->init = virtio_scsi_pci_init_pci;
+    dc->props = virtio_scsi_pci_properties;
+    pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
+    pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
+    pcidev_k->revision = 0x00;
+    pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
+}
+
+static void virtio_scsi_pci_instance_init(Object *obj)
+{
+    VirtIOSCSIPCI *dev = VIRTIO_SCSI_PCI(obj);
+    object_initialize(OBJECT(&dev->vdev), TYPE_VIRTIO_SCSI);
+    object_property_add_child(obj, "virtio-backend", OBJECT(&dev->vdev), NULL);
+}
+
+static const TypeInfo virtio_scsi_pci_info = {
+    .name          = TYPE_VIRTIO_SCSI_PCI,
+    .parent        = TYPE_VIRTIO_PCI,
+    .instance_size = sizeof(VirtIOSCSIPCI),
+    .instance_init = virtio_scsi_pci_instance_init,
+    .class_init    = virtio_scsi_pci_class_init,
+};
+
 /* virtio-pci-bus */
 
 void virtio_pci_bus_new(VirtioBusState *bus, VirtIOPCIProxy *dev)
@@ -1494,7 +1493,6 @@
     type_register_static(&virtio_net_info);
     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_register_static(&virtio_pci_bus_info);
     type_register_static(&virtio_pci_info);
@@ -1502,6 +1500,7 @@
     type_register_static(&virtio_9p_info);
 #endif
     type_register_static(&virtio_blk_pci_info);
+    type_register_static(&virtio_scsi_pci_info);
 }
 
 type_init(virtio_pci_register_types)
diff --git a/hw/virtio-pci.h b/hw/virtio-pci.h
index a9dbfff..bfe7a8e 100644
--- a/hw/virtio-pci.h
+++ b/hw/virtio-pci.h
@@ -26,6 +26,7 @@
 
 typedef struct VirtIOPCIProxy VirtIOPCIProxy;
 typedef struct VirtIOBlkPCI VirtIOBlkPCI;
+typedef struct VirtIOSCSIPCI VirtIOSCSIPCI;
 
 /* virtio-pci-bus */
 
@@ -81,7 +82,6 @@
 #endif
     virtio_serial_conf serial;
     virtio_net_conf net;
-    VirtIOSCSIConf scsi;
     VirtIORNGConf rng;
     bool ioeventfd_disabled;
     bool ioeventfd_started;
@@ -90,6 +90,19 @@
     VirtioBusState bus;
 };
 
+
+/*
+ * virtio-scsi-pci: This extends VirtioPCIProxy.
+ */
+#define TYPE_VIRTIO_SCSI_PCI "virtio-scsi-pci"
+#define VIRTIO_SCSI_PCI(obj) \
+        OBJECT_CHECK(VirtIOSCSIPCI, (obj), TYPE_VIRTIO_SCSI_PCI)
+
+struct VirtIOSCSIPCI {
+    VirtIOPCIProxy parent_obj;
+    VirtIOSCSI vdev;
+};
+
 /*
  * virtio-blk-pci: This extends VirtioPCIProxy.
  */
diff --git a/hw/virtio-scsi.c b/hw/virtio-scsi.c
index 8620712..06a58a6 100644
--- a/hw/virtio-scsi.c
+++ b/hw/virtio-scsi.c
@@ -17,6 +17,7 @@
 #include "qemu/error-report.h"
 #include <hw/scsi.h>
 #include <hw/scsi-defs.h>
+#include "hw/virtio-bus.h"
 
 #define VIRTIO_SCSI_VQ_SIZE     128
 #define VIRTIO_SCSI_CDB_SIZE    32
@@ -171,6 +172,7 @@
 {
     VirtIOSCSI *s = req->dev;
     VirtQueue *vq = req->vq;
+    VirtIODevice *vdev = VIRTIO_DEVICE(s);
     virtqueue_push(vq, &req->elem, req->qsgl.size + req->elem.in_sg[0].iov_len);
     qemu_sglist_destroy(&req->qsgl);
     if (req->sreq) {
@@ -178,7 +180,7 @@
         scsi_req_unref(req->sreq);
     }
     g_free(req);
-    virtio_notify(&s->vdev, vq);
+    virtio_notify(vdev, vq);
 }
 
 static void virtio_scsi_bad_req(void)
@@ -237,7 +239,7 @@
     VirtIOSCSIReq *req = sreq->hba_private;
     uint32_t n = virtio_queue_get_id(req->vq) - 2;
 
-    assert(n < req->dev->conf->num_queues);
+    assert(n < req->dev->conf.num_queues);
     qemu_put_be32s(f, &n);
     qemu_put_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
 }
@@ -251,7 +253,7 @@
 
     req = g_malloc(sizeof(*req));
     qemu_get_be32s(f, &n);
-    assert(n < s->conf->num_queues);
+    assert(n < s->conf.num_queues);
     qemu_get_buffer(f, (unsigned char *)&req->elem, sizeof(req->elem));
     virtio_scsi_parse_req(s, s->cmd_vqs[n], req);
 
@@ -513,10 +515,10 @@
     VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config;
     VirtIOSCSI *s = (VirtIOSCSI *)vdev;
 
-    stl_raw(&scsiconf->num_queues, s->conf->num_queues);
+    stl_raw(&scsiconf->num_queues, s->conf.num_queues);
     stl_raw(&scsiconf->seg_max, 128 - 2);
-    stl_raw(&scsiconf->max_sectors, s->conf->max_sectors);
-    stl_raw(&scsiconf->cmd_per_lun, s->conf->cmd_per_lun);
+    stl_raw(&scsiconf->max_sectors, s->conf.max_sectors);
+    stl_raw(&scsiconf->cmd_per_lun, s->conf.cmd_per_lun);
     stl_raw(&scsiconf->event_info_size, sizeof(VirtIOSCSIEvent));
     stl_raw(&scsiconf->sense_size, s->sense_size);
     stl_raw(&scsiconf->cdb_size, s->cdb_size);
@@ -565,16 +567,16 @@
  */
 static void virtio_scsi_save(QEMUFile *f, void *opaque)
 {
-    VirtIOSCSI *s = opaque;
-    virtio_save(&s->vdev, f);
+    VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
+    virtio_save(vdev, f);
 }
 
 static int virtio_scsi_load(QEMUFile *f, void *opaque, int version_id)
 {
-    VirtIOSCSI *s = opaque;
+    VirtIODevice *vdev = VIRTIO_DEVICE(opaque);
     int ret;
 
-    ret = virtio_load(&s->vdev, f);
+    ret = virtio_load(vdev, f);
     if (ret) {
         return ret;
     }
@@ -586,9 +588,10 @@
 {
     VirtIOSCSIReq *req = virtio_scsi_pop_req(s, s->event_vq);
     VirtIOSCSIEvent *evt;
+    VirtIODevice *vdev = VIRTIO_DEVICE(s);
     int in_size;
 
-    if (!(s->vdev.status & VIRTIO_CONFIG_S_DRIVER_OK)) {
+    if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) {
         return;
     }
 
@@ -632,7 +635,7 @@
 
 static void virtio_scsi_handle_event(VirtIODevice *vdev, VirtQueue *vq)
 {
-    VirtIOSCSI *s = (VirtIOSCSI *)vdev;
+    VirtIOSCSI *s = VIRTIO_SCSI(vdev);
 
     if (s->events_dropped) {
         virtio_scsi_push_event(s, NULL, VIRTIO_SCSI_T_NO_EVENT, 0);
@@ -642,8 +645,9 @@
 static void virtio_scsi_change(SCSIBus *bus, SCSIDevice *dev, SCSISense sense)
 {
     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+    VirtIODevice *vdev = VIRTIO_DEVICE(s);
 
-    if (((s->vdev.guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) &&
+    if (((vdev->guest_features >> VIRTIO_SCSI_F_CHANGE) & 1) &&
         dev->type != TYPE_ROM) {
         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_PARAM_CHANGE,
                                sense.asc | (sense.ascq << 8));
@@ -653,8 +657,9 @@
 static void virtio_scsi_hotplug(SCSIBus *bus, SCSIDevice *dev)
 {
     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+    VirtIODevice *vdev = VIRTIO_DEVICE(s);
 
-    if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
+    if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
                                VIRTIO_SCSI_EVT_RESET_RESCAN);
     }
@@ -663,8 +668,9 @@
 static void virtio_scsi_hot_unplug(SCSIBus *bus, SCSIDevice *dev)
 {
     VirtIOSCSI *s = container_of(bus, VirtIOSCSI, bus);
+    VirtIODevice *vdev = VIRTIO_DEVICE(s);
 
-    if ((s->vdev.guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
+    if ((vdev->guest_features >> VIRTIO_SCSI_F_HOTPLUG) & 1) {
         virtio_scsi_push_event(s, dev, VIRTIO_SCSI_T_TRANSPORT_RESET,
                                VIRTIO_SCSI_EVT_RESET_REMOVED);
     }
@@ -686,49 +692,83 @@
     .load_request = virtio_scsi_load_request,
 };
 
-VirtIODevice *virtio_scsi_init(DeviceState *dev, VirtIOSCSIConf *proxyconf)
+static int virtio_scsi_device_init(VirtIODevice *vdev)
 {
-    VirtIOSCSI *s;
+    DeviceState *qdev = DEVICE(vdev);
+    VirtIOSCSI *s = VIRTIO_SCSI(vdev);
     static int virtio_scsi_id;
-    size_t sz;
     int i;
 
-    sz = sizeof(VirtIOSCSI) + proxyconf->num_queues * sizeof(VirtQueue *);
-    s = (VirtIOSCSI *)virtio_common_init("virtio-scsi", VIRTIO_ID_SCSI,
-                                         sizeof(VirtIOSCSIConfig), sz);
+    virtio_init(VIRTIO_DEVICE(s), "virtio-scsi", VIRTIO_ID_SCSI,
+                sizeof(VirtIOSCSIConfig));
 
-    s->qdev = dev;
-    s->conf = proxyconf;
+    s->cmd_vqs = g_malloc0(s->conf.num_queues * sizeof(VirtQueue *));
 
     /* TODO set up vdev function pointers */
-    s->vdev.get_config = virtio_scsi_get_config;
-    s->vdev.set_config = virtio_scsi_set_config;
-    s->vdev.get_features = virtio_scsi_get_features;
-    s->vdev.reset = virtio_scsi_reset;
+    vdev->get_config = virtio_scsi_get_config;
+    vdev->set_config = virtio_scsi_set_config;
+    vdev->get_features = virtio_scsi_get_features;
+    vdev->reset = virtio_scsi_reset;
 
-    s->ctrl_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
-                                   virtio_scsi_handle_ctrl);
-    s->event_vq = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
+    s->ctrl_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
+                                  virtio_scsi_handle_ctrl);
+    s->event_vq = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
                                    virtio_scsi_handle_event);
-    for (i = 0; i < s->conf->num_queues; i++) {
-        s->cmd_vqs[i] = virtio_add_queue(&s->vdev, VIRTIO_SCSI_VQ_SIZE,
+    for (i = 0; i < s->conf.num_queues; i++) {
+        s->cmd_vqs[i] = virtio_add_queue(vdev, VIRTIO_SCSI_VQ_SIZE,
                                          virtio_scsi_handle_cmd);
     }
 
-    scsi_bus_new(&s->bus, dev, &virtio_scsi_scsi_info);
-    if (!dev->hotplugged) {
+    scsi_bus_new(&s->bus, qdev, &virtio_scsi_scsi_info);
+    if (!qdev->hotplugged) {
         scsi_bus_legacy_handle_cmdline(&s->bus);
     }
 
-    register_savevm(dev, "virtio-scsi", virtio_scsi_id++, 1,
+    register_savevm(qdev, "virtio-scsi", virtio_scsi_id++, 1,
                     virtio_scsi_save, virtio_scsi_load, s);
 
-    return &s->vdev;
+    return 0;
 }
 
-void virtio_scsi_exit(VirtIODevice *vdev)
+static int virtio_scsi_device_exit(DeviceState *qdev)
 {
-    VirtIOSCSI *s = (VirtIOSCSI *)vdev;
-    unregister_savevm(s->qdev, "virtio-scsi", s);
-    virtio_cleanup(vdev);
+    VirtIOSCSI *s = VIRTIO_SCSI(qdev);
+    VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
+
+    unregister_savevm(qdev, "virtio-scsi", s);
+    g_free(s->cmd_vqs);
+    virtio_common_cleanup(vdev);
+    return 0;
 }
+
+static Property virtio_scsi_properties[] = {
+    DEFINE_VIRTIO_SCSI_PROPERTIES(VirtIOSCSI, conf),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void virtio_scsi_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+    dc->exit = virtio_scsi_device_exit;
+    dc->props = virtio_scsi_properties;
+    vdc->init = virtio_scsi_device_init;
+    vdc->get_config = virtio_scsi_get_config;
+    vdc->set_config = virtio_scsi_set_config;
+    vdc->get_features = virtio_scsi_get_features;
+    vdc->reset = virtio_scsi_reset;
+}
+
+static const TypeInfo virtio_scsi_info = {
+    .name = TYPE_VIRTIO_SCSI,
+    .parent = TYPE_VIRTIO_DEVICE,
+    .instance_size = sizeof(VirtIOSCSI),
+    .class_init = virtio_scsi_class_init,
+};
+
+static void virtio_register_types(void)
+{
+    type_register_static(&virtio_scsi_info);
+}
+
+type_init(virtio_register_types)
diff --git a/hw/virtio-scsi.h b/hw/virtio-scsi.h
index ccf1e42..31e97bb 100644
--- a/hw/virtio-scsi.h
+++ b/hw/virtio-scsi.h
@@ -18,6 +18,11 @@
 #include "hw/pci/pci.h"
 #include "hw/scsi.h"
 
+#define TYPE_VIRTIO_SCSI "virtio-scsi"
+#define VIRTIO_SCSI(obj) \
+        OBJECT_CHECK(VirtIOSCSI, (obj), TYPE_VIRTIO_SCSI)
+
+
 /* The ID for virtio_scsi */
 #define VIRTIO_ID_SCSI  8
 
@@ -33,9 +38,8 @@
 };
 
 typedef struct VirtIOSCSI {
-    VirtIODevice vdev;
-    DeviceState *qdev;
-    VirtIOSCSIConf *conf;
+    VirtIODevice parent_obj;
+    VirtIOSCSIConf conf;
 
     SCSIBus bus;
     uint32_t sense_size;
@@ -44,15 +48,19 @@
     bool events_dropped;
     VirtQueue *ctrl_vq;
     VirtQueue *event_vq;
-    VirtQueue *cmd_vqs[0];
+    VirtQueue **cmd_vqs;
 } VirtIOSCSI;
 
-#define DEFINE_VIRTIO_SCSI_PROPERTIES(_state, _features_field, _conf_field) \
-    DEFINE_VIRTIO_COMMON_FEATURES(_state, _features_field), \
-    DEFINE_PROP_UINT32("num_queues", _state, _conf_field.num_queues, 1), \
-    DEFINE_PROP_UINT32("max_sectors", _state, _conf_field.max_sectors, 0xFFFF), \
-    DEFINE_PROP_UINT32("cmd_per_lun", _state, _conf_field.cmd_per_lun, 128), \
-    DEFINE_PROP_BIT("hotplug", _state, _features_field, VIRTIO_SCSI_F_HOTPLUG, true), \
-    DEFINE_PROP_BIT("param_change", _state, _features_field, VIRTIO_SCSI_F_CHANGE, true)
+#define DEFINE_VIRTIO_SCSI_PROPERTIES(_state, _conf_field)                     \
+    DEFINE_PROP_UINT32("num_queues", _state, _conf_field.num_queues, 1),       \
+    DEFINE_PROP_UINT32("max_sectors", _state, _conf_field.max_sectors, 0xFFFF),\
+    DEFINE_PROP_UINT32("cmd_per_lun", _state, _conf_field.cmd_per_lun, 128)
+
+#define DEFINE_VIRTIO_SCSI_FEATURES(_state, _feature_field)                    \
+    DEFINE_VIRTIO_COMMON_FEATURES(_state, _feature_field),                     \
+    DEFINE_PROP_BIT("hotplug", _state, _feature_field, VIRTIO_SCSI_F_HOTPLUG,  \
+                                                       true),                  \
+    DEFINE_PROP_BIT("param_change", _state, _feature_field,                    \
+                                            VIRTIO_SCSI_F_CHANGE, true)
 
 #endif /* _QEMU_VIRTIO_SCSI_H */
diff --git a/include/char/char.h b/include/char/char.h
index 0326b2a..5c3a7a5 100644
--- a/include/char/char.h
+++ b/include/char/char.h
@@ -170,6 +170,21 @@
 int qemu_chr_fe_write(CharDriverState *s, const uint8_t *buf, int len);
 
 /**
+ * @qemu_chr_fe_write_all:
+ *
+ * Write data to a character backend from the front end.  This function will
+ * send data from the front end to the back end.  Unlike @qemu_chr_fe_write,
+ * this function will block if the back end cannot consume all of the data
+ * attempted to be written.
+ *
+ * @buf the data
+ * @len the number of bytes to send
+ *
+ * Returns: the number of bytes consumed
+ */
+int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len);
+
+/**
  * @qemu_chr_fe_ioctl:
  *
  * Issue a device specific ioctl to a backend.
diff --git a/monitor.c b/monitor.c
index 2d9e887..e450919 100644
--- a/monitor.c
+++ b/monitor.c
@@ -2746,6 +2746,13 @@
         .mhandler.cmd = hmp_info_tpm,
     },
     {
+        .name       = "cpu_max",
+        .args_type  = "",
+        .params     = "",
+        .help       = "Get maximum number of VCPUs supported by machine",
+        .mhandler.cmd = hmp_query_cpu_max,
+    },
+    {
         .name       = NULL,
     },
 };
diff --git a/qapi-schema.json b/qapi-schema.json
index 6c4966b..6494787 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1834,6 +1834,17 @@
 { 'command': 'query-migrate-cache-size', 'returns': 'int' }
 
 ##
+## @query-cpu-max
+##
+## query maximum number of CPUs supported by machine
+##
+## Returns: number of CPUs
+##
+## Since: 1.5
+###
+{ 'command': 'query-cpu-max', 'returns': 'int' }
+
+##
 # @ObjectPropertyInfo:
 #
 # @name: the name of the property
@@ -3405,13 +3416,12 @@
 #
 # A union referencing different TPM backend types' configuration options
 #
-# @tpm-passthough-options: TPMPassthroughOptions describing the TPM
-#                          passthrough configuration options
+# @passthrough: The configuration options for the TPM passthrough type
 #
 # Since: 1.5
 ##
 { 'union': 'TpmTypeOptions',
-   'data': { 'tpm-passthrough-options' : 'TPMPassthroughOptions' } }
+   'data': { 'passthrough' : 'TPMPassthroughOptions' } }
 
 ##
 # @TpmInfo:
@@ -3422,17 +3432,14 @@
 #
 # @model: The TPM frontend model
 #
-# @type: The TPM (backend) type being used
-#
-# @tpm-options: The TPM (backend) type configuration options
+# @options: The TPM (backend) type configuration options
 #
 # Since: 1.5
 ##
 { 'type': 'TPMInfo',
   'data': {'id': 'str',
            'model': 'TpmModel',
-           'type': 'TpmType',
-           'tpm-options': 'TpmTypeOptions' } }
+           'options': 'TpmTypeOptions' } }
 
 ##
 # @query-tpm:
diff --git a/qemu-char.c b/qemu-char.c
index 4e011df..936150f 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -140,6 +140,33 @@
     return s->chr_write(s, buf, len);
 }
 
+int qemu_chr_fe_write_all(CharDriverState *s, const uint8_t *buf, int len)
+{
+    int offset = 0;
+    int res;
+
+    while (offset < len) {
+        do {
+            res = s->chr_write(s, buf + offset, len - offset);
+            if (res == -1 && errno == EAGAIN) {
+                g_usleep(100);
+            }
+        } while (res == -1 && errno == EAGAIN);
+
+        if (res == 0) {
+            break;
+        }
+
+        if (res < 0) {
+            return res;
+        }
+
+        offset += res;
+    }
+
+    return offset;
+}
+
 int qemu_chr_fe_ioctl(CharDriverState *s, int cmd, void *arg)
 {
     if (!s->chr_ioctl)
diff --git a/qemu-options.hx b/qemu-options.hx
index d7afeab..c40ba55 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2241,7 +2241,8 @@
 @option{passthrough}.
 
 The specific backend type will determine the applicable options.
-The @code{-tpmdev} option requires a @code{-device} option.
+The @code{-tpmdev} option creates the TPM backend and requires a
+@code{-device} option that specifies the TPM frontend interface model.
 
 Options to each backend are described below.
 
diff --git a/qmp-commands.hx b/qmp-commands.hx
index fdc4048..1e0e11e 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -385,6 +385,28 @@
 EQMP
 
     {
+        .name       = "query-cpu-max",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_cpu_max,
+    },
+
+SQMP
+query-cpu-max
+-------------
+
+Get the maximum CPUs supported by the machine being currently
+emulated.
+
+Returns json-int.
+
+Example:
+
+-> { "execute": "query-cpu-max" }
+<- { "return": 255 }
+
+EQMP
+
+    {
         .name       = "memsave",
         .args_type  = "val:l,size:i,filename:s,cpu:i?",
         .mhandler.cmd_new = qmp_marshal_input_memsave,
@@ -2732,18 +2754,76 @@
         .mhandler.cmd_new = qmp_marshal_input_query_tpm,
     },
 
+SQMP
+query-tpm
+---------
+
+Return information about the TPM device.
+
+Arguments: None
+
+Example:
+
+-> { "execute": "query-tpm" }
+<- { "return":
+     [
+       { "model": "tpm-tis",
+         "options":
+           { "type": "passthrough",
+             "data":
+               { "cancel-path": "/sys/class/misc/tpm0/device/cancel",
+                 "path": "/dev/tpm0"
+               }
+           },
+         "id": "tpm0"
+       }
+     ]
+   }
+
+EQMP
+
     {
         .name       = "query-tpm-models",
         .args_type  = "",
         .mhandler.cmd_new = qmp_marshal_input_query_tpm_models,
     },
 
+SQMP
+query-tpm-models
+----------------
+
+Return a list of supported TPM models.
+
+Arguments: None
+
+Example:
+
+-> { "execute": "query-tpm-models" }
+<- { "return": [ "tpm-tis" ] }
+
+EQMP
+
     {
         .name       = "query-tpm-types",
         .args_type  = "",
         .mhandler.cmd_new = qmp_marshal_input_query_tpm_types,
     },
 
+SQMP
+query-tpm-types
+---------------
+
+Return a list of supported TPM types.
+
+Arguments: None
+
+Example:
+
+-> { "execute": "query-tpm-types" }
+<- { "return": [ "passthrough" ] }
+
+EQMP
+
     {
         .name       = "chardev-add",
         .args_type  = "id:s,backend:q",
diff --git a/qom/object.c b/qom/object.c
index 3d638ff..3f77968 100644
--- a/qom/object.c
+++ b/qom/object.c
@@ -629,7 +629,18 @@
                          ObjectPropertyRelease *release,
                          void *opaque, Error **errp)
 {
-    ObjectProperty *prop = g_malloc0(sizeof(*prop));
+    ObjectProperty *prop;
+
+    QTAILQ_FOREACH(prop, &obj->properties, node) {
+        if (strcmp(prop->name, name) == 0) {
+            error_setg(errp, "attempt to add duplicate property '%s'"
+                       " to object (type '%s')", name,
+                       object_get_typename(obj));
+            return;
+        }
+    }
+
+    prop = g_malloc0(sizeof(*prop));
 
     prop->name = g_strdup(name);
     prop->type = g_strdup(type);
diff --git a/qtest.c b/qtest.c
index 5e0e9ec..b03b68a 100644
--- a/qtest.c
+++ b/qtest.c
@@ -191,7 +191,7 @@
     len = vsnprintf(buffer, sizeof(buffer), fmt, ap);
     va_end(ap);
 
-    qemu_chr_fe_write(chr, (uint8_t *)buffer, len);
+    qemu_chr_fe_write_all(chr, (uint8_t *)buffer, len);
     if (qtest_log_fp && qtest_opened) {
         fprintf(qtest_log_fp, "%s", buffer);
     }
diff --git a/tpm/tpm.c b/tpm/tpm.c
index ffd2495..ae00eae 100644
--- a/tpm/tpm.c
+++ b/tpm/tpm.c
@@ -257,14 +257,13 @@
 
     res->id = g_strdup(drv->id);
     res->model = drv->fe_model;
-    res->type = drv->ops->type;
-    res->tpm_options = g_new0(TpmTypeOptions, 1);
+    res->options = g_new0(TpmTypeOptions, 1);
 
-    switch (res->type) {
+    switch (drv->ops->type) {
     case TPM_TYPE_PASSTHROUGH:
-        res->tpm_options->kind = TPM_TYPE_OPTIONS_KIND_TPM_PASSTHROUGH_OPTIONS;
+        res->options->kind = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
         tpo = g_new0(TPMPassthroughOptions, 1);
-        res->tpm_options->tpm_passthrough_options = tpo;
+        res->options->passthrough = tpo;
         if (drv->path) {
             tpo->path = g_strdup(drv->path);
             tpo->has_path = true;
diff --git a/vl.c b/vl.c
index aeed7f4..7643f16 100644
--- a/vl.c
+++ b/vl.c
@@ -662,6 +662,11 @@
     return info;
 }
 
+int64_t qmp_query_cpu_max(Error **errp)
+{
+    return current_machine->max_cpus;
+}
+
 /***********************************************************/
 /* real time host monotonic timer */