diff mbox

[v6,12/16] qapi: Don't special-case simple union wrappers

Message ID 1458254921-17042-13-git-send-email-eblake@redhat.com
State New, archived
Headers show

Commit Message

Eric Blake March 17, 2016, 10:48 p.m. UTC
Simple unions were carrying a special case that hid their 'data'
QMP member from the resulting C struct, via the hack method
QAPISchemaObjectTypeVariant.simple_union_type().  But by using
the work we started by unboxing flat union and alternate
branches, coupled with the ability to visit the members of an
implicit type, we can now expose the simple union's implicit
type in qapi-types.h:

| struct q_obj_ImageInfoSpecificQCow2_wrapper {
|     ImageInfoSpecificQCow2 *data;
| };
|
| struct q_obj_ImageInfoSpecificVmdk_wrapper {
|     ImageInfoSpecificVmdk *data;
| };
...
| struct ImageInfoSpecific {
|     ImageInfoSpecificKind type;
|     union { /* union tag is @type */
|         void *data;
|-        ImageInfoSpecificQCow2 *qcow2;
|-        ImageInfoSpecificVmdk *vmdk;
|+        q_obj_ImageInfoSpecificQCow2_wrapper qcow2;
|+        q_obj_ImageInfoSpecificVmdk_wrapper vmdk;
|     } u;
| };

Doing this removes asymmetry between QAPI's QMP side and its
C side (both sides now expose 'data'), and means that the
treatment of a simple union as sugar for a flat union is now
equivalent in both languages (previously the two approaches used
a different layer of dereferencing, where the simple union could
be converted to a flat union with equivalent C layout but
different {} on the wire, or to an equivalent QMP wire form
but with different C representation).  Using the implicit type
also lets us get rid of the simple_union_type() hack.

Of course, now all clients of simple unions have to adjust from
using su->u.member to using su->u.member.data; while this touches
a number of files in the tree, some earlier cleanup patches
helped minimize the change to the initialization of a temporary
variable rather than every single member access.  The generated
qapi-visit.c code is also affected by the layout change:

|@@ -7393,10 +7393,10 @@ void visit_type_ImageInfoSpecific_member
|     }
|     switch (obj->type) {
|     case IMAGE_INFO_SPECIFIC_KIND_QCOW2:
|-        visit_type_ImageInfoSpecificQCow2(v, "data", &obj->u.qcow2, &err);
|+        visit_type_q_obj_ImageInfoSpecificQCow2_wrapper_members(v, &obj->u.qcow2, &err);
|         break;
|     case IMAGE_INFO_SPECIFIC_KIND_VMDK:
|-        visit_type_ImageInfoSpecificVmdk(v, "data", &obj->u.vmdk, &err);
|+        visit_type_q_obj_ImageInfoSpecificVmdk_wrapper_members(v, &obj->u.vmdk, &err);
|         break;
|     default:
|         abort();

Signed-off-by: Eric Blake <eblake@redhat.com>

---
v6: no change
v5: rebase to q_obj naming change, hoist assertion earlier in series
v4: improve commit message, rebase onto exposed implicit types
[no v3]
v2: rebase onto s/fields/members/ change, changes in master; pick
up missing net/ files
---
 scripts/qapi.py                 | 10 -----
 scripts/qapi-types.py           |  8 +---
 scripts/qapi-visit.py           | 22 ++---------
 backends/baum.c                 |  2 +-
 backends/msmouse.c              |  2 +-
 block/nbd.c                     |  6 +--
 block/qcow2.c                   |  6 +--
 block/vmdk.c                    |  8 ++--
 blockdev.c                      | 24 ++++++------
 hmp.c                           |  8 ++--
 hw/char/escc.c                  |  2 +-
 hw/input/hid.c                  |  8 ++--
 hw/input/ps2.c                  |  6 +--
 hw/input/virtio-input-hid.c     |  8 ++--
 hw/mem/pc-dimm.c                |  2 +-
 net/dump.c                      |  2 +-
 net/hub.c                       |  2 +-
 net/l2tpv3.c                    |  2 +-
 net/net.c                       |  4 +-
 net/netmap.c                    |  2 +-
 net/slirp.c                     |  2 +-
 net/socket.c                    |  2 +-
 net/tap-win32.c                 |  2 +-
 net/tap.c                       |  4 +-
 net/vde.c                       |  2 +-
 net/vhost-user.c                |  2 +-
 numa.c                          |  4 +-
 qemu-char.c                     | 82 +++++++++++++++++++++--------------------
 qemu-nbd.c                      |  6 +--
 replay/replay-input.c           | 44 +++++++++++-----------
 spice-qemu-char.c               | 14 ++++---
 tests/test-io-channel-socket.c  | 40 ++++++++++----------
 tests/test-qmp-commands.c       |  2 +-
 tests/test-qmp-input-visitor.c  | 25 +++++++------
 tests/test-qmp-output-visitor.c | 24 ++++++------
 tpm.c                           |  2 +-
 ui/console.c                    |  4 +-
 ui/input-keymap.c               | 10 ++---
 ui/input-legacy.c               |  8 ++--
 ui/input.c                      | 34 ++++++++---------
 ui/vnc-auth-sasl.c              |  3 +-
 ui/vnc.c                        | 29 ++++++++-------
 util/qemu-sockets.c             | 35 +++++++++---------
 43 files changed, 246 insertions(+), 268 deletions(-)
diff mbox

Patch

diff --git a/scripts/qapi.py b/scripts/qapi.py
index 08d63bf..d91af94 100644
--- a/scripts/qapi.py
+++ b/scripts/qapi.py
@@ -1115,16 +1115,6 @@  class QAPISchemaObjectTypeVariant(QAPISchemaObjectTypeMember):
     def __init__(self, name, typ):
         QAPISchemaObjectTypeMember.__init__(self, name, typ, False)

-    # This function exists to support ugly simple union special cases
-    # TODO get rid of them, and drop the function
-    def simple_union_type(self):
-        if (self.type.is_implicit() and
-                isinstance(self.type, QAPISchemaObjectType)):
-            assert len(self.type.members) == 1
-            assert not self.type.variants
-            return self.type.members[0].type
-        return None
-

 class QAPISchemaAlternateType(QAPISchemaType):
     def __init__(self, name, info, variants):
diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index 79416b2..92ae619 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -121,16 +121,10 @@  def gen_variants(variants):
                 c_name=c_name(variants.tag_member.name))

     for var in variants.variants:
-        # Ugly special case for simple union TODO get rid of it
-        simple_union_type = var.simple_union_type()
-        if simple_union_type:
-            typ = simple_union_type.c_type()
-        else:
-            typ = var.type.c_unboxed_type()
         ret += mcgen('''
         %(c_type)s %(c_name)s;
 ''',
-                     c_type=typ,
+                     c_type=var.type.c_unboxed_type(),
                      c_name=c_name(var.name))

     ret += mcgen('''
diff --git a/scripts/qapi-visit.py b/scripts/qapi-visit.py
index 5220bad..c147990 100644
--- a/scripts/qapi-visit.py
+++ b/scripts/qapi-visit.py
@@ -77,29 +77,15 @@  void visit_type_%(c_name)s_members(Visitor *v, %(c_name)s *obj, Error **errp)
                      c_name=c_name(variants.tag_member.name))

         for var in variants.variants:
-            # TODO ugly special case for simple union
-            simple_union_type = var.simple_union_type()
             ret += mcgen('''
     case %(case)s:
+        visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, &err);
+        break;
 ''',
                          case=c_enum_const(variants.tag_member.type.name,
                                            var.name,
-                                           variants.tag_member.type.prefix))
-            if simple_union_type:
-                ret += mcgen('''
-        visit_type_%(c_type)s(v, "data", &obj->u.%(c_name)s, &err);
-''',
-                             c_type=simple_union_type.c_name(),
-                             c_name=c_name(var.name))
-            else:
-                ret += mcgen('''
-        visit_type_%(c_type)s_members(v, &obj->u.%(c_name)s, &err);
-''',
-                             c_type=var.type.c_name(),
-                             c_name=c_name(var.name))
-            ret += mcgen('''
-        break;
-''')
+                                           variants.tag_member.type.prefix),
+                         c_type=var.type.c_name(), c_name=c_name(var.name))

         ret += mcgen('''
     default:
diff --git a/backends/baum.c b/backends/baum.c
index c11320e..eef3467 100644
--- a/backends/baum.c
+++ b/backends/baum.c
@@ -567,7 +567,7 @@  static CharDriverState *chr_baum_init(const char *id,
                                       ChardevReturn *ret,
                                       Error **errp)
 {
-    ChardevCommon *common = backend->u.braille;
+    ChardevCommon *common = backend->u.braille.data;
     BaumDriverState *baum;
     CharDriverState *chr;
     brlapi_handle_t *handle;
diff --git a/backends/msmouse.c b/backends/msmouse.c
index 5e1833c..8dea5a1 100644
--- a/backends/msmouse.c
+++ b/backends/msmouse.c
@@ -68,7 +68,7 @@  static CharDriverState *qemu_chr_open_msmouse(const char *id,
                                               ChardevReturn *ret,
                                               Error **errp)
 {
-    ChardevCommon *common = backend->u.msmouse;
+    ChardevCommon *common = backend->u.msmouse.data;
     CharDriverState *chr;

     chr = qemu_chr_alloc(common, errp);
diff --git a/block/nbd.c b/block/nbd.c
index 9f333c9..836424c 100644
--- a/block/nbd.c
+++ b/block/nbd.c
@@ -206,13 +206,13 @@  static SocketAddress *nbd_config(BDRVNBDState *s, QDict *options, char **export,
     if (qdict_haskey(options, "path")) {
         UnixSocketAddress *q_unix;
         saddr->type = SOCKET_ADDRESS_KIND_UNIX;
-        q_unix = saddr->u.q_unix = g_new0(UnixSocketAddress, 1);
+        q_unix = saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
         q_unix->path = g_strdup(qdict_get_str(options, "path"));
         qdict_del(options, "path");
     } else {
         InetSocketAddress *inet;
         saddr->type = SOCKET_ADDRESS_KIND_INET;
-        inet = saddr->u.inet = g_new0(InetSocketAddress, 1);
+        inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
         inet->host = g_strdup(qdict_get_str(options, "host"));
         if (!qdict_get_try_str(options, "port")) {
             inet->port = g_strdup_printf("%d", NBD_DEFAULT_PORT);
@@ -321,7 +321,7 @@  static int nbd_open(BlockDriverState *bs, QDict *options, int flags,
             error_setg(errp, "TLS only supported over IP sockets");
             goto error;
         }
-        hostname = saddr->u.inet->host;
+        hostname = saddr->u.inet.data->host;
     }

     /* establish TCP connection, return error if it fails
diff --git a/block/qcow2.c b/block/qcow2.c
index 5f4fea6..cec5bd0 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2800,15 +2800,15 @@  static ImageInfoSpecific *qcow2_get_specific_info(BlockDriverState *bs)

     *spec_info = (ImageInfoSpecific){
         .type  = IMAGE_INFO_SPECIFIC_KIND_QCOW2,
-        .u.qcow2 = g_new(ImageInfoSpecificQCow2, 1),
+        .u.qcow2.data = g_new(ImageInfoSpecificQCow2, 1),
     };
     if (s->qcow_version == 2) {
-        *spec_info->u.qcow2 = (ImageInfoSpecificQCow2){
+        *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){
             .compat             = g_strdup("0.10"),
             .refcount_bits      = s->refcount_bits,
         };
     } else if (s->qcow_version == 3) {
-        *spec_info->u.qcow2 = (ImageInfoSpecificQCow2){
+        *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){
             .compat             = g_strdup("1.1"),
             .lazy_refcounts     = s->compatible_features &
                                   QCOW2_COMPAT_LAZY_REFCOUNTS,
diff --git a/block/vmdk.c b/block/vmdk.c
index 80f0338..29c8fc3 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -2203,18 +2203,18 @@  static ImageInfoSpecific *vmdk_get_specific_info(BlockDriverState *bs)

     *spec_info = (ImageInfoSpecific){
         .type = IMAGE_INFO_SPECIFIC_KIND_VMDK,
-        {
-            .vmdk = g_new0(ImageInfoSpecificVmdk, 1),
+        .u = {
+            .vmdk.data = g_new0(ImageInfoSpecificVmdk, 1),
         },
     };

-    *spec_info->u.vmdk = (ImageInfoSpecificVmdk) {
+    *spec_info->u.vmdk.data = (ImageInfoSpecificVmdk) {
         .create_type = g_strdup(s->create_type),
         .cid = s->cid,
         .parent_cid = s->parent_cid,
     };

-    next = &spec_info->u.vmdk->extents;
+    next = &spec_info->u.vmdk.data->extents;
     for (i = 0; i < s->num_extents; i++) {
         *next = g_new0(ImageInfoList, 1);
         (*next)->value = vmdk_get_extent_info(&s->extents[i]);
diff --git a/blockdev.c b/blockdev.c
index 85dee57..24c8861 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -1247,7 +1247,7 @@  void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
     };
     TransactionAction action = {
         .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC,
-        .u.blockdev_snapshot_sync = &snapshot,
+        .u.blockdev_snapshot_sync.data = &snapshot,
     };
     blockdev_do_action(&action, errp);
 }
@@ -1261,7 +1261,7 @@  void qmp_blockdev_snapshot(const char *node, const char *overlay,
     };
     TransactionAction action = {
         .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT,
-        .u.blockdev_snapshot = &snapshot_data,
+        .u.blockdev_snapshot.data = &snapshot_data,
     };
     blockdev_do_action(&action, errp);
 }
@@ -1276,7 +1276,7 @@  void qmp_blockdev_snapshot_internal_sync(const char *device,
     };
     TransactionAction action = {
         .type = TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC,
-        .u.blockdev_snapshot_internal_sync = &snapshot,
+        .u.blockdev_snapshot_internal_sync.data = &snapshot,
     };
     blockdev_do_action(&action, errp);
 }
@@ -1515,7 +1515,7 @@  static void internal_snapshot_prepare(BlkActionState *common,

     g_assert(common->action->type ==
              TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_INTERNAL_SYNC);
-    internal = common->action->u.blockdev_snapshot_internal_sync;
+    internal = common->action->u.blockdev_snapshot_internal_sync.data;
     state = DO_UPCAST(InternalSnapshotState, common, common);

     /* 1. parse input */
@@ -1665,7 +1665,7 @@  static void external_snapshot_prepare(BlkActionState *common,
     switch (action->type) {
     case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT:
         {
-            BlockdevSnapshot *s = action->u.blockdev_snapshot;
+            BlockdevSnapshot *s = action->u.blockdev_snapshot.data;
             device = s->node;
             node_name = s->node;
             new_image_file = NULL;
@@ -1674,7 +1674,7 @@  static void external_snapshot_prepare(BlkActionState *common,
         break;
     case TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC:
         {
-            BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
+            BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
             device = s->has_device ? s->device : NULL;
             node_name = s->has_node_name ? s->node_name : NULL;
             new_image_file = s->snapshot_file;
@@ -1723,7 +1723,7 @@  static void external_snapshot_prepare(BlkActionState *common,
     }

     if (action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC) {
-        BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync;
+        BlockdevSnapshotSync *s = action->u.blockdev_snapshot_sync.data;
         const char *format = s->has_format ? s->format : "qcow2";
         enum NewImageMode mode;
         const char *snapshot_node_name =
@@ -1861,7 +1861,7 @@  static void drive_backup_prepare(BlkActionState *common, Error **errp)
     Error *local_err = NULL;

     assert(common->action->type == TRANSACTION_ACTION_KIND_DRIVE_BACKUP);
-    backup = common->action->u.drive_backup;
+    backup = common->action->u.drive_backup.data;

     blk = blk_by_name(backup->device);
     if (!blk) {
@@ -1943,7 +1943,7 @@  static void blockdev_backup_prepare(BlkActionState *common, Error **errp)
     Error *local_err = NULL;

     assert(common->action->type == TRANSACTION_ACTION_KIND_BLOCKDEV_BACKUP);
-    backup = common->action->u.blockdev_backup;
+    backup = common->action->u.blockdev_backup.data;

     blk = blk_by_name(backup->device);
     if (!blk) {
@@ -2029,7 +2029,7 @@  static void block_dirty_bitmap_add_prepare(BlkActionState *common,
         return;
     }

-    action = common->action->u.block_dirty_bitmap_add;
+    action = common->action->u.block_dirty_bitmap_add.data;
     /* AIO context taken and released within qmp_block_dirty_bitmap_add */
     qmp_block_dirty_bitmap_add(action->node, action->name,
                                action->has_granularity, action->granularity,
@@ -2048,7 +2048,7 @@  static void block_dirty_bitmap_add_abort(BlkActionState *common)
     BlockDirtyBitmapState *state = DO_UPCAST(BlockDirtyBitmapState,
                                              common, common);

-    action = common->action->u.block_dirty_bitmap_add;
+    action = common->action->u.block_dirty_bitmap_add.data;
     /* Should not be able to fail: IF the bitmap was added via .prepare(),
      * then the node reference and bitmap name must have been valid.
      */
@@ -2068,7 +2068,7 @@  static void block_dirty_bitmap_clear_prepare(BlkActionState *common,
         return;
     }

-    action = common->action->u.block_dirty_bitmap_clear;
+    action = common->action->u.block_dirty_bitmap_clear.data;
     state->bitmap = block_dirty_bitmap_lookup(action->node,
                                               action->name,
                                               &state->bs,
diff --git a/hmp.c b/hmp.c
index 5b6084a..6ace227 100644
--- a/hmp.c
+++ b/hmp.c
@@ -857,7 +857,7 @@  void hmp_info_tpm(Monitor *mon, const QDict *qdict)

         switch (ti->options->type) {
         case TPM_TYPE_OPTIONS_KIND_PASSTHROUGH:
-            tpo = ti->options->u.passthrough;
+            tpo = ti->options->u.passthrough.data;
             monitor_printf(mon, "%s%s%s%s",
                            tpo->has_path ? ",path=" : "",
                            tpo->has_path ? tpo->path : "",
@@ -1753,14 +1753,14 @@  void hmp_sendkey(Monitor *mon, const QDict *qdict)
                 goto err_out;
             }
             keylist->value->type = KEY_VALUE_KIND_NUMBER;
-            keylist->value->u.number = value;
+            keylist->value->u.number.data = value;
         } else {
             int idx = index_from_key(keys, keyname_len);
             if (idx == Q_KEY_CODE__MAX) {
                 goto err_out;
             }
             keylist->value->type = KEY_VALUE_KIND_QCODE;
-            keylist->value->u.qcode = idx;
+            keylist->value->u.qcode.data = idx;
         }

         if (!separator) {
@@ -1977,7 +1977,7 @@  void hmp_info_memory_devices(Monitor *mon, const QDict *qdict)
         if (value) {
             switch (value->type) {
             case MEMORY_DEVICE_INFO_KIND_DIMM:
-                di = value->u.dimm;
+                di = value->u.dimm.data;

                 monitor_printf(mon, "Memory device [%s]: \"%s\"\n",
                                MemoryDeviceInfoKind_lookup[value->type],
diff --git a/hw/char/escc.c b/hw/char/escc.c
index c7a24ac..7bf09a0 100644
--- a/hw/char/escc.c
+++ b/hw/char/escc.c
@@ -845,7 +845,7 @@  static void sunkbd_handle_event(DeviceState *dev, QemuConsole *src,
     InputKeyEvent *key;

     assert(evt->type == INPUT_EVENT_KIND_KEY);
-    key = evt->u.key;
+    key = evt->u.key.data;
     qcode = qemu_input_key_value_to_qcode(key->key);
     trace_escc_sunkbd_event_in(qcode, QKeyCode_lookup[qcode],
                                key->down);
diff --git a/hw/input/hid.c b/hw/input/hid.c
index 41a9387..5912677 100644
--- a/hw/input/hid.c
+++ b/hw/input/hid.c
@@ -124,7 +124,7 @@  static void hid_pointer_event(DeviceState *dev, QemuConsole *src,

     switch (evt->type) {
     case INPUT_EVENT_KIND_REL:
-        move = evt->u.rel;
+        move = evt->u.rel.data;
         if (move->axis == INPUT_AXIS_X) {
             e->xdx += move->value;
         } else if (move->axis == INPUT_AXIS_Y) {
@@ -133,7 +133,7 @@  static void hid_pointer_event(DeviceState *dev, QemuConsole *src,
         break;

     case INPUT_EVENT_KIND_ABS:
-        move = evt->u.abs;
+        move = evt->u.abs.data;
         if (move->axis == INPUT_AXIS_X) {
             e->xdx = move->value;
         } else if (move->axis == INPUT_AXIS_Y) {
@@ -142,7 +142,7 @@  static void hid_pointer_event(DeviceState *dev, QemuConsole *src,
         break;

     case INPUT_EVENT_KIND_BTN:
-        btn = evt->u.btn;
+        btn = evt->u.btn.data;
         if (btn->down) {
             e->buttons_state |= bmap[btn->button];
             if (btn->button == INPUT_BUTTON_WHEEL_UP) {
@@ -228,7 +228,7 @@  static void hid_keyboard_event(DeviceState *dev, QemuConsole *src,
     HIDState *hs = (HIDState *)dev;
     int scancodes[3], i, count;
     int slot;
-    InputKeyEvent *key = evt->u.key;
+    InputKeyEvent *key = evt->u.key.data;

     count = qemu_input_key_value_to_scancode(key->key,
                                              key->down,
diff --git a/hw/input/ps2.c b/hw/input/ps2.c
index 86df1a0..58892d5 100644
--- a/hw/input/ps2.c
+++ b/hw/input/ps2.c
@@ -182,7 +182,7 @@  static void ps2_keyboard_event(DeviceState *dev, QemuConsole *src,
 {
     PS2KbdState *s = (PS2KbdState *)dev;
     int scancodes[3], i, count;
-    InputKeyEvent *key = evt->u.key;
+    InputKeyEvent *key = evt->u.key.data;

     qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER);
     count = qemu_input_key_value_to_scancode(key->key,
@@ -399,7 +399,7 @@  static void ps2_mouse_event(DeviceState *dev, QemuConsole *src,

     switch (evt->type) {
     case INPUT_EVENT_KIND_REL:
-        move = evt->u.rel;
+        move = evt->u.rel.data;
         if (move->axis == INPUT_AXIS_X) {
             s->mouse_dx += move->value;
         } else if (move->axis == INPUT_AXIS_Y) {
@@ -408,7 +408,7 @@  static void ps2_mouse_event(DeviceState *dev, QemuConsole *src,
         break;

     case INPUT_EVENT_KIND_BTN:
-        btn = evt->u.btn;
+        btn = evt->u.btn.data;
         if (btn->down) {
             s->mouse_buttons |= bmap[btn->button];
             if (btn->button == INPUT_BUTTON_WHEEL_UP) {
diff --git a/hw/input/virtio-input-hid.c b/hw/input/virtio-input-hid.c
index e5480c3..5d12157 100644
--- a/hw/input/virtio-input-hid.c
+++ b/hw/input/virtio-input-hid.c
@@ -197,7 +197,7 @@  static void virtio_input_handle_event(DeviceState *dev, QemuConsole *src,

     switch (evt->type) {
     case INPUT_EVENT_KIND_KEY:
-        key = evt->u.key;
+        key = evt->u.key.data;
         qcode = qemu_input_key_value_to_qcode(key->key);
         if (qcode && keymap_qcode[qcode]) {
             event.type  = cpu_to_le16(EV_KEY);
@@ -212,7 +212,7 @@  static void virtio_input_handle_event(DeviceState *dev, QemuConsole *src,
         }
         break;
     case INPUT_EVENT_KIND_BTN:
-        btn = evt->u.btn;
+        btn = evt->u.btn.data;
         if (keymap_button[btn->button]) {
             event.type  = cpu_to_le16(EV_KEY);
             event.code  = cpu_to_le16(keymap_button[btn->button]);
@@ -227,14 +227,14 @@  static void virtio_input_handle_event(DeviceState *dev, QemuConsole *src,
         }
         break;
     case INPUT_EVENT_KIND_REL:
-        move = evt->u.rel;
+        move = evt->u.rel.data;
         event.type  = cpu_to_le16(EV_REL);
         event.code  = cpu_to_le16(axismap_rel[move->axis]);
         event.value = cpu_to_le32(move->value);
         virtio_input_send(vinput, &event);
         break;
     case INPUT_EVENT_KIND_ABS:
-        move = evt->u.abs;
+        move = evt->u.abs.data;
         event.type  = cpu_to_le16(EV_ABS);
         event.code  = cpu_to_le16(axismap_abs[move->axis]);
         event.value = cpu_to_le32(move->value);
diff --git a/hw/mem/pc-dimm.c b/hw/mem/pc-dimm.c
index 973bf20..c4b4430 100644
--- a/hw/mem/pc-dimm.c
+++ b/hw/mem/pc-dimm.c
@@ -180,7 +180,7 @@  int qmp_pc_dimm_device_list(Object *obj, void *opaque)
                                                NULL);
             di->memdev = object_get_canonical_path(OBJECT(dimm->hostmem));

-            info->u.dimm = di;
+            info->u.dimm.data = di;
             elem->value = info;
             elem->next = NULL;
             **prev = elem;
diff --git a/net/dump.c b/net/dump.c
index 61dec9d..94ac32a 100644
--- a/net/dump.c
+++ b/net/dump.c
@@ -189,7 +189,7 @@  int net_init_dump(const NetClientOptions *opts, const char *name,
     DumpNetClient *dnc;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_DUMP);
-    dump = opts->u.dump;
+    dump = opts->u.dump.data;

     assert(peer);

diff --git a/net/hub.c b/net/hub.c
index b6d44fd..6d90c6e 100644
--- a/net/hub.c
+++ b/net/hub.c
@@ -288,7 +288,7 @@  int net_init_hubport(const NetClientOptions *opts, const char *name,

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_HUBPORT);
     assert(!peer);
-    hubport = opts->u.hubport;
+    hubport = opts->u.hubport.data;

     net_hub_add_port(hubport->hubid, name);
     return 0;
diff --git a/net/l2tpv3.c b/net/l2tpv3.c
index 824161c..5c668f7 100644
--- a/net/l2tpv3.c
+++ b/net/l2tpv3.c
@@ -546,7 +546,7 @@  int net_init_l2tpv3(const NetClientOptions *opts,
     s->header_mismatch = false;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_L2TPV3);
-    l2tpv3 = opts->u.l2tpv3;
+    l2tpv3 = opts->u.l2tpv3.data;

     if (l2tpv3->has_ipv6 && l2tpv3->ipv6) {
         s->ipv6 = l2tpv3->ipv6;
diff --git a/net/net.c b/net/net.c
index 73cefbc..1a78edf 100644
--- a/net/net.c
+++ b/net/net.c
@@ -893,7 +893,7 @@  static int net_init_nic(const NetClientOptions *opts, const char *name,
     const NetLegacyNicOptions *nic;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_NIC);
-    nic = opts->u.nic;
+    nic = opts->u.nic.data;

     idx = nic_get_free_idx();
     if (idx == -1 || nb_nics >= MAX_NICS) {
@@ -1025,7 +1025,7 @@  static int net_client_init1(const void *object, int is_netdev, Error **errp)

         /* Do not add to a vlan if it's a nic with a netdev= parameter. */
         if (opts->type != NET_CLIENT_OPTIONS_KIND_NIC ||
-            !opts->u.nic->has_netdev) {
+            !opts->u.nic.data->has_netdev) {
             peer = net_hub_add_port(net->has_vlan ? net->vlan : 0, NULL);
         }
     }
diff --git a/net/netmap.c b/net/netmap.c
index 1b42728..6fa2c41 100644
--- a/net/netmap.c
+++ b/net/netmap.c
@@ -420,7 +420,7 @@  static NetClientInfo net_netmap_info = {
 int net_init_netmap(const NetClientOptions *opts,
                     const char *name, NetClientState *peer, Error **errp)
 {
-    const NetdevNetmapOptions *netmap_opts = opts->u.netmap;
+    const NetdevNetmapOptions *netmap_opts = opts->u.netmap.data;
     struct nm_desc *nmd;
     NetClientState *nc;
     Error *err = NULL;
diff --git a/net/slirp.c b/net/slirp.c
index 9954160..95239bc 100644
--- a/net/slirp.c
+++ b/net/slirp.c
@@ -814,7 +814,7 @@  int net_init_slirp(const NetClientOptions *opts, const char *name,
     const char **dnssearch;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_USER);
-    user = opts->u.user;
+    user = opts->u.user.data;

     vnet = user->has_net ? g_strdup(user->net) :
            user->has_ip  ? g_strdup_printf("%s/24", user->ip) :
diff --git a/net/socket.c b/net/socket.c
index 73dc49a..9826efb 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -704,7 +704,7 @@  int net_init_socket(const NetClientOptions *opts, const char *name,
     const NetdevSocketOptions *sock;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_SOCKET);
-    sock = opts->u.socket;
+    sock = opts->u.socket.data;

     if (sock->has_fd + sock->has_listen + sock->has_connect + sock->has_mcast +
         sock->has_udp != 1) {
diff --git a/net/tap-win32.c b/net/tap-win32.c
index 38bbac0..f1e142a 100644
--- a/net/tap-win32.c
+++ b/net/tap-win32.c
@@ -795,7 +795,7 @@  int net_init_tap(const NetClientOptions *opts, const char *name,
     const NetdevTapOptions *tap;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_TAP);
-    tap = opts->u.tap;
+    tap = opts->u.tap.data;

     if (!tap->has_ifname) {
         error_report("tap: no interface name");
diff --git a/net/tap.c b/net/tap.c
index cd7a7fc..8f790d1 100644
--- a/net/tap.c
+++ b/net/tap.c
@@ -565,7 +565,7 @@  int net_init_bridge(const NetClientOptions *opts, const char *name,
     int fd, vnet_hdr;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_BRIDGE);
-    bridge = opts->u.bridge;
+    bridge = opts->u.bridge.data;

     helper = bridge->has_helper ? bridge->helper : DEFAULT_BRIDGE_HELPER;
     br     = bridge->has_br     ? bridge->br     : DEFAULT_BRIDGE_INTERFACE;
@@ -728,7 +728,7 @@  int net_init_tap(const NetClientOptions *opts, const char *name,
     char ifname[128];

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_TAP);
-    tap = opts->u.tap;
+    tap = opts->u.tap.data;
     queues = tap->has_queues ? tap->queues : 1;
     vhostfdname = tap->has_vhostfd ? tap->vhostfd : NULL;

diff --git a/net/vde.c b/net/vde.c
index 973faf5..9427eaa 100644
--- a/net/vde.c
+++ b/net/vde.c
@@ -116,7 +116,7 @@  int net_init_vde(const NetClientOptions *opts, const char *name,
     const NetdevVdeOptions *vde;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_VDE);
-    vde = opts->u.vde;
+    vde = opts->u.vde.data;

     /* missing optional values have been initialized to "all bits zero" */
     if (net_vde_init(peer, "vde", name, vde->sock, vde->port, vde->group,
diff --git a/net/vhost-user.c b/net/vhost-user.c
index 58b8dae..1b9e73a 100644
--- a/net/vhost-user.c
+++ b/net/vhost-user.c
@@ -306,7 +306,7 @@  int net_init_vhost_user(const NetClientOptions *opts, const char *name,
     CharDriverState *chr;

     assert(opts->type == NET_CLIENT_OPTIONS_KIND_VHOST_USER);
-    vhost_user_opts = opts->u.vhost_user;
+    vhost_user_opts = opts->u.vhost_user.data;

     chr = net_vhost_parse_chardev(vhost_user_opts, errp);
     if (!chr) {
diff --git a/numa.c b/numa.c
index da27bf8..572712c 100644
--- a/numa.c
+++ b/numa.c
@@ -228,7 +228,7 @@  static int parse_numa(void *opaque, QemuOpts *opts, Error **errp)

     switch (object->type) {
     case NUMA_OPTIONS_KIND_NODE:
-        numa_node_parse(object->u.node, opts, &err);
+        numa_node_parse(object->u.node.data, opts, &err);
         if (err) {
             goto error;
         }
@@ -482,7 +482,7 @@  static void numa_stat_memory_devices(uint64_t node_mem[])
         if (value) {
             switch (value->type) {
             case MEMORY_DEVICE_INFO_KIND_DIMM:
-                node_mem[value->u.dimm->node] += value->u.dimm->size;
+                node_mem[value->u.dimm.data->node] += value->u.dimm.data->size;
                 break;
             default:
                 break;
diff --git a/qemu-char.c b/qemu-char.c
index bfcf80d..f90e4c1 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -98,16 +98,18 @@  static char *SocketAddress_to_str(const char *prefix, SocketAddress *addr,
     switch (addr->type) {
     case SOCKET_ADDRESS_KIND_INET:
         return g_strdup_printf("%s%s:%s:%s%s", prefix,
-                               is_telnet ? "telnet" : "tcp", addr->u.inet->host,
-                               addr->u.inet->port, is_listen ? ",server" : "");
+                               is_telnet ? "telnet" : "tcp",
+                               addr->u.inet.data->host,
+                               addr->u.inet.data->port,
+                               is_listen ? ",server" : "");
         break;
     case SOCKET_ADDRESS_KIND_UNIX:
         return g_strdup_printf("%sunix:%s%s", prefix,
-                               addr->u.q_unix->path,
+                               addr->u.q_unix.data->path,
                                is_listen ? ",server" : "");
         break;
     case SOCKET_ADDRESS_KIND_FD:
-        return g_strdup_printf("%sfd:%s%s", prefix, addr->u.fd->str,
+        return g_strdup_printf("%sfd:%s%s", prefix, addr->u.fd.data->str,
                                is_listen ? ",server" : "");
         break;
     default:
@@ -488,7 +490,7 @@  static CharDriverState *qemu_chr_open_null(const char *id,
                                            Error **errp)
 {
     CharDriverState *chr;
-    ChardevCommon *common = backend->u.null;
+    ChardevCommon *common = backend->u.null.data;

     chr = qemu_chr_alloc(common, errp);
     if (!chr) {
@@ -789,7 +791,7 @@  static CharDriverState *qemu_chr_open_mux(const char *id,
                                           ChardevBackend *backend,
                                           ChardevReturn *ret, Error **errp)
 {
-    ChardevMux *mux = backend->u.mux;
+    ChardevMux *mux = backend->u.mux.data;
     CharDriverState *chr, *drv;
     MuxDriver *d;
     ChardevCommon *common = qapi_ChardevMux_base(mux);
@@ -1106,7 +1108,7 @@  static CharDriverState *qemu_chr_open_pipe(const char *id,
                                            ChardevReturn *ret,
                                            Error **errp)
 {
-    ChardevHostdev *opts = backend->u.pipe;
+    ChardevHostdev *opts = backend->u.pipe.data;
     int fd_in, fd_out;
     char *filename_in;
     char *filename_out;
@@ -1188,7 +1190,7 @@  static CharDriverState *qemu_chr_open_stdio(const char *id,
                                             ChardevReturn *ret,
                                             Error **errp)
 {
-    ChardevStdio *opts = backend->u.stdio;
+    ChardevStdio *opts = backend->u.stdio.data;
     CharDriverState *chr;
     struct sigaction act;
     ChardevCommon *common = qapi_ChardevStdio_base(opts);
@@ -1434,7 +1436,7 @@  static CharDriverState *qemu_chr_open_pty(const char *id,
     PtyCharDriver *s;
     int master_fd, slave_fd;
     char pty_name[PATH_MAX];
-    ChardevCommon *common = backend->u.pty;
+    ChardevCommon *common = backend->u.pty.data;

     master_fd = qemu_openpty_raw(&slave_fd, pty_name);
     if (master_fd < 0) {
@@ -2205,7 +2207,7 @@  static CharDriverState *qemu_chr_open_pipe(const char *id,
                                            ChardevReturn *ret,
                                            Error **errp)
 {
-    ChardevHostdev *opts = backend->u.pipe;
+    ChardevHostdev *opts = backend->u.pipe.data;
     const char *filename = opts->device;
     CharDriverState *chr;
     WinCharState *s;
@@ -2251,7 +2253,7 @@  static CharDriverState *qemu_chr_open_win_con(const char *id,
                                               ChardevReturn *ret,
                                               Error **errp)
 {
-    ChardevCommon *common = backend->u.console;
+    ChardevCommon *common = backend->u.console.data;
     return qemu_chr_open_win_file(GetStdHandle(STD_OUTPUT_HANDLE),
                                   common, errp);
 }
@@ -2401,7 +2403,7 @@  static CharDriverState *qemu_chr_open_stdio(const char *id,
     WinStdioCharState *stdio;
     DWORD              dwMode;
     int                is_console = 0;
-    ChardevCommon *common = qapi_ChardevStdio_base(backend->u.stdio);
+    ChardevCommon *common = qapi_ChardevStdio_base(backend->u.stdio.data);

     chr   = qemu_chr_alloc(common, errp);
     if (!chr) {
@@ -3042,7 +3044,7 @@  static void tcp_chr_tls_init(CharDriverState *chr)
     } else {
         tioc = qio_channel_tls_new_client(
             s->ioc, s->tls_creds,
-            s->addr->u.inet->host,
+            s->addr->u.inet.data->host,
             &err);
     }
     if (tioc == NULL) {
@@ -3249,7 +3251,7 @@  static CharDriverState *qemu_chr_open_ringbuf(const char *id,
                                               ChardevReturn *ret,
                                               Error **errp)
 {
-    ChardevRingbuf *opts = backend->u.ringbuf;
+    ChardevRingbuf *opts = backend->u.ringbuf.data;
     ChardevCommon *common = qapi_ChardevRingbuf_base(opts);
     CharDriverState *chr;
     RingBufCharDriver *d;
@@ -3546,7 +3548,7 @@  static void qemu_chr_parse_file_out(QemuOpts *opts, ChardevBackend *backend,
         error_setg(errp, "chardev: file: no filename given");
         return;
     }
-    file = backend->u.file = g_new0(ChardevFile, 1);
+    file = backend->u.file.data = g_new0(ChardevFile, 1);
     qemu_chr_parse_common(opts, qapi_ChardevFile_base(file));
     file->out = g_strdup(path);

@@ -3559,7 +3561,7 @@  static void qemu_chr_parse_stdio(QemuOpts *opts, ChardevBackend *backend,
 {
     ChardevStdio *stdio;

-    stdio = backend->u.stdio = g_new0(ChardevStdio, 1);
+    stdio = backend->u.stdio.data = g_new0(ChardevStdio, 1);
     qemu_chr_parse_common(opts, qapi_ChardevStdio_base(stdio));
     stdio->has_signal = true;
     stdio->signal = qemu_opt_get_bool(opts, "signal", true);
@@ -3576,7 +3578,7 @@  static void qemu_chr_parse_serial(QemuOpts *opts, ChardevBackend *backend,
         error_setg(errp, "chardev: serial/tty: no device path given");
         return;
     }
-    serial = backend->u.serial = g_new0(ChardevHostdev, 1);
+    serial = backend->u.serial.data = g_new0(ChardevHostdev, 1);
     qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(serial));
     serial->device = g_strdup(device);
 }
@@ -3593,7 +3595,7 @@  static void qemu_chr_parse_parallel(QemuOpts *opts, ChardevBackend *backend,
         error_setg(errp, "chardev: parallel: no device path given");
         return;
     }
-    parallel = backend->u.parallel = g_new0(ChardevHostdev, 1);
+    parallel = backend->u.parallel.data = g_new0(ChardevHostdev, 1);
     qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(parallel));
     parallel->device = g_strdup(device);
 }
@@ -3609,7 +3611,7 @@  static void qemu_chr_parse_pipe(QemuOpts *opts, ChardevBackend *backend,
         error_setg(errp, "chardev: pipe: no device path given");
         return;
     }
-    dev = backend->u.pipe = g_new0(ChardevHostdev, 1);
+    dev = backend->u.pipe.data = g_new0(ChardevHostdev, 1);
     qemu_chr_parse_common(opts, qapi_ChardevHostdev_base(dev));
     dev->device = g_strdup(device);
 }
@@ -3620,7 +3622,7 @@  static void qemu_chr_parse_ringbuf(QemuOpts *opts, ChardevBackend *backend,
     int val;
     ChardevRingbuf *ringbuf;

-    ringbuf = backend->u.ringbuf = g_new0(ChardevRingbuf, 1);
+    ringbuf = backend->u.ringbuf.data = g_new0(ChardevRingbuf, 1);
     qemu_chr_parse_common(opts, qapi_ChardevRingbuf_base(ringbuf));

     val = qemu_opt_get_size(opts, "size", 0);
@@ -3640,7 +3642,7 @@  static void qemu_chr_parse_mux(QemuOpts *opts, ChardevBackend *backend,
         error_setg(errp, "chardev: mux: no chardev given");
         return;
     }
-    mux = backend->u.mux = g_new0(ChardevMux, 1);
+    mux = backend->u.mux.data = g_new0(ChardevMux, 1);
     qemu_chr_parse_common(opts, qapi_ChardevMux_base(mux));
     mux->chardev = g_strdup(chardev);
 }
@@ -3676,7 +3678,7 @@  static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
         }
     }

-    sock = backend->u.socket = g_new0(ChardevSocket, 1);
+    sock = backend->u.socket.data = g_new0(ChardevSocket, 1);
     qemu_chr_parse_common(opts, qapi_ChardevSocket_base(sock));

     sock->has_nodelay = true;
@@ -3695,12 +3697,12 @@  static void qemu_chr_parse_socket(QemuOpts *opts, ChardevBackend *backend,
     if (path) {
         UnixSocketAddress *q_unix;
         addr->type = SOCKET_ADDRESS_KIND_UNIX;
-        q_unix = addr->u.q_unix = g_new0(UnixSocketAddress, 1);
+        q_unix = addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
         q_unix->path = g_strdup(path);
     } else {
         addr->type = SOCKET_ADDRESS_KIND_INET;
-        addr->u.inet = g_new(InetSocketAddress, 1);
-        *addr->u.inet = (InetSocketAddress) {
+        addr->u.inet.data = g_new(InetSocketAddress, 1);
+        *addr->u.inet.data = (InetSocketAddress) {
             .host = g_strdup(host),
             .port = g_strdup(port),
             .has_to = qemu_opt_get(opts, "to"),
@@ -3743,13 +3745,13 @@  static void qemu_chr_parse_udp(QemuOpts *opts, ChardevBackend *backend,
         has_local = true;
     }

-    udp = backend->u.udp = g_new0(ChardevUdp, 1);
+    udp = backend->u.udp.data = g_new0(ChardevUdp, 1);
     qemu_chr_parse_common(opts, qapi_ChardevUdp_base(udp));

     addr = g_new0(SocketAddress, 1);
     addr->type = SOCKET_ADDRESS_KIND_INET;
-    addr->u.inet = g_new(InetSocketAddress, 1);
-    *addr->u.inet = (InetSocketAddress) {
+    addr->u.inet.data = g_new(InetSocketAddress, 1);
+    *addr->u.inet.data = (InetSocketAddress) {
         .host = g_strdup(host),
         .port = g_strdup(port),
         .has_ipv4 = qemu_opt_get(opts, "ipv4"),
@@ -3763,8 +3765,8 @@  static void qemu_chr_parse_udp(QemuOpts *opts, ChardevBackend *backend,
         udp->has_local = true;
         addr = g_new0(SocketAddress, 1);
         addr->type = SOCKET_ADDRESS_KIND_INET;
-        addr->u.inet = g_new(InetSocketAddress, 1);
-        *addr->u.inet = (InetSocketAddress) {
+        addr->u.inet.data = g_new(InetSocketAddress, 1);
+        *addr->u.inet.data = (InetSocketAddress) {
             .host = g_strdup(localaddr),
             .port = g_strdup(localport),
         };
@@ -3851,7 +3853,7 @@  CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
     } else {
         ChardevCommon *cc = g_new0(ChardevCommon, 1);
         qemu_chr_parse_common(opts, cc);
-        backend->u.null = cc; /* Any ChardevCommon member would work */
+        backend->u.null.data = cc; /* Any ChardevCommon member would work */
     }

     ret = qmp_chardev_add(bid ? bid : id, backend, errp);
@@ -3863,9 +3865,9 @@  CharDriverState *qemu_chr_new_from_opts(QemuOpts *opts,
         qapi_free_ChardevBackend(backend);
         qapi_free_ChardevReturn(ret);
         backend = g_new0(ChardevBackend, 1);
-        backend->u.mux = g_new0(ChardevMux, 1);
+        backend->u.mux.data = g_new0(ChardevMux, 1);
         backend->type = CHARDEV_BACKEND_KIND_MUX;
-        backend->u.mux->chardev = g_strdup(bid);
+        backend->u.mux.data->chardev = g_strdup(bid);
         ret = qmp_chardev_add(id, backend, errp);
         if (!ret) {
             chr = qemu_chr_find(bid);
@@ -4194,7 +4196,7 @@  static CharDriverState *qmp_chardev_open_file(const char *id,
                                               ChardevReturn *ret,
                                               Error **errp)
 {
-    ChardevFile *file = backend->u.file;
+    ChardevFile *file = backend->u.file.data;
     ChardevCommon *common = qapi_ChardevFile_base(file);
     HANDLE out;

@@ -4217,7 +4219,7 @@  static CharDriverState *qmp_chardev_open_serial(const char *id,
                                                 ChardevReturn *ret,
                                                 Error **errp)
 {
-    ChardevHostdev *serial = backend->u.serial;
+    ChardevHostdev *serial = backend->u.serial.data;
     ChardevCommon *common = qapi_ChardevHostdev_base(serial);
     return qemu_chr_open_win_path(serial->device, common, errp);
 }
@@ -4241,7 +4243,7 @@  static CharDriverState *qmp_chardev_open_file(const char *id,
                                               ChardevReturn *ret,
                                               Error **errp)
 {
-    ChardevFile *file = backend->u.file;
+    ChardevFile *file = backend->u.file.data;
     ChardevCommon *common = qapi_ChardevFile_base(file);
     int flags, in = -1, out;

@@ -4275,7 +4277,7 @@  static CharDriverState *qmp_chardev_open_serial(const char *id,
                                                 ChardevReturn *ret,
                                                 Error **errp)
 {
-    ChardevHostdev *serial = backend->u.serial;
+    ChardevHostdev *serial = backend->u.serial.data;
     ChardevCommon *common = qapi_ChardevHostdev_base(serial);
     int fd;

@@ -4294,7 +4296,7 @@  static CharDriverState *qmp_chardev_open_parallel(const char *id,
                                                   ChardevReturn *ret,
                                                   Error **errp)
 {
-    ChardevHostdev *parallel = backend->u.parallel;
+    ChardevHostdev *parallel = backend->u.parallel.data;
     ChardevCommon *common = qapi_ChardevHostdev_base(parallel);
     int fd;

@@ -4335,7 +4337,7 @@  static CharDriverState *qmp_chardev_open_socket(const char *id,
 {
     CharDriverState *chr;
     TCPCharDriver *s;
-    ChardevSocket *sock = backend->u.socket;
+    ChardevSocket *sock = backend->u.socket.data;
     SocketAddress *addr = sock->addr;
     bool do_nodelay     = sock->has_nodelay ? sock->nodelay : false;
     bool is_listen      = sock->has_server  ? sock->server  : true;
@@ -4460,7 +4462,7 @@  static CharDriverState *qmp_chardev_open_udp(const char *id,
                                              ChardevReturn *ret,
                                              Error **errp)
 {
-    ChardevUdp *udp = backend->u.udp;
+    ChardevUdp *udp = backend->u.udp.data;
     ChardevCommon *common = qapi_ChardevUdp_base(udp);
     QIOChannelSocket *sioc = qio_channel_socket_new();

diff --git a/qemu-nbd.c b/qemu-nbd.c
index d5f8473..f3528c8 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -377,12 +377,12 @@  static SocketAddress *nbd_build_socket_address(const char *sockpath,
     saddr = g_new0(SocketAddress, 1);
     if (sockpath) {
         saddr->type = SOCKET_ADDRESS_KIND_UNIX;
-        saddr->u.q_unix = g_new0(UnixSocketAddress, 1);
-        saddr->u.q_unix->path = g_strdup(sockpath);
+        saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
+        saddr->u.q_unix.data->path = g_strdup(sockpath);
     } else {
         InetSocketAddress *inet;
         saddr->type = SOCKET_ADDRESS_KIND_INET;
-        inet = saddr->u.inet = g_new0(InetSocketAddress, 1);
+        inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
         inet->host = g_strdup(bindto);
         if (port) {
             inet->port = g_strdup(port);
diff --git a/replay/replay-input.c b/replay/replay-input.c
index c38af50..2d5d919 100644
--- a/replay/replay-input.c
+++ b/replay/replay-input.c
@@ -54,16 +54,16 @@  void replay_save_input_event(InputEvent *evt)

     switch (evt->type) {
     case INPUT_EVENT_KIND_KEY:
-        key = evt->u.key;
+        key = evt->u.key.data;
         replay_put_dword(key->key->type);

         switch (key->key->type) {
         case KEY_VALUE_KIND_NUMBER:
-            replay_put_qword(key->key->u.number);
+            replay_put_qword(key->key->u.number.data);
             replay_put_byte(key->down);
             break;
         case KEY_VALUE_KIND_QCODE:
-            replay_put_dword(key->key->u.qcode);
+            replay_put_dword(key->key->u.qcode.data);
             replay_put_byte(key->down);
             break;
         case KEY_VALUE_KIND__MAX:
@@ -72,17 +72,17 @@  void replay_save_input_event(InputEvent *evt)
         }
         break;
     case INPUT_EVENT_KIND_BTN:
-        btn = evt->u.btn;
+        btn = evt->u.btn.data;
         replay_put_dword(btn->button);
         replay_put_byte(btn->down);
         break;
     case INPUT_EVENT_KIND_REL:
-        move = evt->u.rel;
+        move = evt->u.rel.data;
         replay_put_dword(move->axis);
         replay_put_qword(move->value);
         break;
     case INPUT_EVENT_KIND_ABS:
-        move = evt->u.abs;
+        move = evt->u.abs.data;
         replay_put_dword(move->axis);
         replay_put_qword(move->value);
         break;
@@ -105,17 +105,17 @@  InputEvent *replay_read_input_event(void)
     evt.type = replay_get_dword();
     switch (evt.type) {
     case INPUT_EVENT_KIND_KEY:
-        evt.u.key = &key;
-        evt.u.key->key->type = replay_get_dword();
+        evt.u.key.data = &key;
+        evt.u.key.data->key->type = replay_get_dword();

-        switch (evt.u.key->key->type) {
+        switch (evt.u.key.data->key->type) {
         case KEY_VALUE_KIND_NUMBER:
-            evt.u.key->key->u.number = replay_get_qword();
-            evt.u.key->down = replay_get_byte();
+            evt.u.key.data->key->u.number.data = replay_get_qword();
+            evt.u.key.data->down = replay_get_byte();
             break;
         case KEY_VALUE_KIND_QCODE:
-            evt.u.key->key->u.qcode = (QKeyCode)replay_get_dword();
-            evt.u.key->down = replay_get_byte();
+            evt.u.key.data->key->u.qcode.data = (QKeyCode)replay_get_dword();
+            evt.u.key.data->down = replay_get_byte();
             break;
         case KEY_VALUE_KIND__MAX:
             /* keep gcc happy */
@@ -123,19 +123,19 @@  InputEvent *replay_read_input_event(void)
         }
         break;
     case INPUT_EVENT_KIND_BTN:
-        evt.u.btn = &btn;
-        evt.u.btn->button = (InputButton)replay_get_dword();
-        evt.u.btn->down = replay_get_byte();
+        evt.u.btn.data = &btn;
+        evt.u.btn.data->button = (InputButton)replay_get_dword();
+        evt.u.btn.data->down = replay_get_byte();
         break;
     case INPUT_EVENT_KIND_REL:
-        evt.u.rel = &rel;
-        evt.u.rel->axis = (InputAxis)replay_get_dword();
-        evt.u.rel->value = replay_get_qword();
+        evt.u.rel.data = &rel;
+        evt.u.rel.data->axis = (InputAxis)replay_get_dword();
+        evt.u.rel.data->value = replay_get_qword();
         break;
     case INPUT_EVENT_KIND_ABS:
-        evt.u.abs = &abs;
-        evt.u.abs->axis = (InputAxis)replay_get_dword();
-        evt.u.abs->value = replay_get_qword();
+        evt.u.abs.data = &abs;
+        evt.u.abs.data->axis = (InputAxis)replay_get_dword();
+        evt.u.abs.data->value = replay_get_qword();
         break;
     case INPUT_EVENT_KIND__MAX:
         /* keep gcc happy */
diff --git a/spice-qemu-char.c b/spice-qemu-char.c
index 21885c5..351fcaa 100644
--- a/spice-qemu-char.c
+++ b/spice-qemu-char.c
@@ -305,9 +305,10 @@  static CharDriverState *qemu_chr_open_spice_vmc(const char *id,
                                                 ChardevReturn *ret,
                                                 Error **errp)
 {
-    const char *type = backend->u.spicevmc->type;
+    ChardevSpiceChannel *spicevmc = backend->u.spicevmc.data;
+    const char *type = spicevmc->type;
     const char **psubtype = spice_server_char_device_recognized_subtypes();
-    ChardevCommon *common = qapi_ChardevSpiceChannel_base(backend->u.spicevmc);
+    ChardevCommon *common = qapi_ChardevSpiceChannel_base(spicevmc);

     for (; *psubtype != NULL; ++psubtype) {
         if (strcmp(type, *psubtype) == 0) {
@@ -329,8 +330,9 @@  static CharDriverState *qemu_chr_open_spice_port(const char *id,
                                                  ChardevReturn *ret,
                                                  Error **errp)
 {
-    const char *name = backend->u.spiceport->fqdn;
-    ChardevCommon *common = qapi_ChardevSpicePort_base(backend->u.spiceport);
+    ChardevSpicePort *spiceport = backend->u.spiceport.data;
+    const char *name = spiceport->fqdn;
+    ChardevCommon *common = qapi_ChardevSpicePort_base(spiceport);
     CharDriverState *chr;
     SpiceCharDriver *s;

@@ -372,7 +374,7 @@  static void qemu_chr_parse_spice_vmc(QemuOpts *opts, ChardevBackend *backend,
         error_setg(errp, "chardev: spice channel: no name given");
         return;
     }
-    spicevmc = backend->u.spicevmc = g_new0(ChardevSpiceChannel, 1);
+    spicevmc = backend->u.spicevmc.data = g_new0(ChardevSpiceChannel, 1);
     qemu_chr_parse_common(opts, qapi_ChardevSpiceChannel_base(spicevmc));
     spicevmc->type = g_strdup(name);
 }
@@ -387,7 +389,7 @@  static void qemu_chr_parse_spice_port(QemuOpts *opts, ChardevBackend *backend,
         error_setg(errp, "chardev: spice port: no name given");
         return;
     }
-    spiceport = backend->u.spiceport = g_new0(ChardevSpicePort, 1);
+    spiceport = backend->u.spiceport.data = g_new0(ChardevSpicePort, 1);
     qemu_chr_parse_common(opts, qapi_ChardevSpicePort_base(spiceport));
     spiceport->fqdn = g_strdup(name);
 }
diff --git a/tests/test-io-channel-socket.c b/tests/test-io-channel-socket.c
index 87018ac..be0c300 100644
--- a/tests/test-io-channel-socket.c
+++ b/tests/test-io-channel-socket.c
@@ -131,8 +131,8 @@  static void test_io_channel_setup_sync(SocketAddress *listen_addr,
         SocketAddress *laddr = qio_channel_socket_get_local_address(
             lioc, &error_abort);

-        g_free(connect_addr->u.inet->port);
-        connect_addr->u.inet->port = g_strdup(laddr->u.inet->port);
+        g_free(connect_addr->u.inet.data->port);
+        connect_addr->u.inet.data->port = g_strdup(laddr->u.inet.data->port);

         qapi_free_SocketAddress(laddr);
     }
@@ -193,8 +193,8 @@  static void test_io_channel_setup_async(SocketAddress *listen_addr,
         SocketAddress *laddr = qio_channel_socket_get_local_address(
             lioc, &error_abort);

-        g_free(connect_addr->u.inet->port);
-        connect_addr->u.inet->port = g_strdup(laddr->u.inet->port);
+        g_free(connect_addr->u.inet.data->port);
+        connect_addr->u.inet.data->port = g_strdup(laddr->u.inet.data->port);

         qapi_free_SocketAddress(laddr);
     }
@@ -296,15 +296,15 @@  static void test_io_channel_ipv4(bool async)
     SocketAddress *connect_addr = g_new0(SocketAddress, 1);

     listen_addr->type = SOCKET_ADDRESS_KIND_INET;
-    listen_addr->u.inet = g_new(InetSocketAddress, 1);
-    *listen_addr->u.inet = (InetSocketAddress) {
+    listen_addr->u.inet.data = g_new(InetSocketAddress, 1);
+    *listen_addr->u.inet.data = (InetSocketAddress) {
         .host = g_strdup("127.0.0.1"),
         .port = NULL, /* Auto-select */
     };

     connect_addr->type = SOCKET_ADDRESS_KIND_INET;
-    connect_addr->u.inet = g_new(InetSocketAddress, 1);
-    *connect_addr->u.inet = (InetSocketAddress) {
+    connect_addr->u.inet.data = g_new(InetSocketAddress, 1);
+    *connect_addr->u.inet.data = (InetSocketAddress) {
         .host = g_strdup("127.0.0.1"),
         .port = NULL, /* Filled in later */
     };
@@ -334,15 +334,15 @@  static void test_io_channel_ipv6(bool async)
     SocketAddress *connect_addr = g_new0(SocketAddress, 1);

     listen_addr->type = SOCKET_ADDRESS_KIND_INET;
-    listen_addr->u.inet = g_new(InetSocketAddress, 1);
-    *listen_addr->u.inet = (InetSocketAddress) {
+    listen_addr->u.inet.data = g_new(InetSocketAddress, 1);
+    *listen_addr->u.inet.data = (InetSocketAddress) {
         .host = g_strdup("::1"),
         .port = NULL, /* Auto-select */
     };

     connect_addr->type = SOCKET_ADDRESS_KIND_INET;
-    connect_addr->u.inet = g_new(InetSocketAddress, 1);
-    *connect_addr->u.inet = (InetSocketAddress) {
+    connect_addr->u.inet.data = g_new(InetSocketAddress, 1);
+    *connect_addr->u.inet.data = (InetSocketAddress) {
         .host = g_strdup("::1"),
         .port = NULL, /* Filled in later */
     };
@@ -374,12 +374,12 @@  static void test_io_channel_unix(bool async)

 #define TEST_SOCKET "test-io-channel-socket.sock"
     listen_addr->type = SOCKET_ADDRESS_KIND_UNIX;
-    listen_addr->u.q_unix = g_new0(UnixSocketAddress, 1);
-    listen_addr->u.q_unix->path = g_strdup(TEST_SOCKET);
+    listen_addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
+    listen_addr->u.q_unix.data->path = g_strdup(TEST_SOCKET);

     connect_addr->type = SOCKET_ADDRESS_KIND_UNIX;
-    connect_addr->u.q_unix = g_new0(UnixSocketAddress, 1);
-    connect_addr->u.q_unix->path = g_strdup(TEST_SOCKET);
+    connect_addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
+    connect_addr->u.q_unix.data->path = g_strdup(TEST_SOCKET);

     test_io_channel(async, listen_addr, connect_addr, true);

@@ -423,12 +423,12 @@  static void test_io_channel_unix_fd_pass(void)
     fdsend[2] = testfd;

     listen_addr->type = SOCKET_ADDRESS_KIND_UNIX;
-    listen_addr->u.q_unix = g_new0(UnixSocketAddress, 1);
-    listen_addr->u.q_unix->path = g_strdup(TEST_SOCKET);
+    listen_addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
+    listen_addr->u.q_unix.data->path = g_strdup(TEST_SOCKET);

     connect_addr->type = SOCKET_ADDRESS_KIND_UNIX;
-    connect_addr->u.q_unix = g_new0(UnixSocketAddress, 1);
-    connect_addr->u.q_unix->path = g_strdup(TEST_SOCKET);
+    connect_addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
+    connect_addr->u.q_unix.data->path = g_strdup(TEST_SOCKET);

     test_io_channel_setup_sync(listen_addr, connect_addr, &src, &dst);

diff --git a/tests/test-qmp-commands.c b/tests/test-qmp-commands.c
index 650ba46..14a9ebb 100644
--- a/tests/test-qmp-commands.c
+++ b/tests/test-qmp-commands.c
@@ -69,7 +69,7 @@  __org_qemu_x_Union1 *qmp___org_qemu_x_command(__org_qemu_x_EnumList *a,
     __org_qemu_x_Union1 *ret = g_new0(__org_qemu_x_Union1, 1);

     ret->type = ORG_QEMU_X_UNION1_KIND___ORG_QEMU_X_BRANCH;
-    ret->u.__org_qemu_x_branch = strdup("blah1");
+    ret->u.__org_qemu_x_branch.data = strdup("blah1");

     /* Also test that 'wchar-t' was munged to 'q_wchar_t' */
     if (b && b->value && !b->value->has_q_wchar_t) {
diff --git a/tests/test-qmp-input-visitor.c b/tests/test-qmp-input-visitor.c
index b05da5b..5941e90 100644
--- a/tests/test-qmp-input-visitor.c
+++ b/tests/test-qmp-input-visitor.c
@@ -477,63 +477,64 @@  static void test_native_list_integer_helper(TestInputVisitorData *data,
     switch (kind) {
     case USER_DEF_NATIVE_LIST_UNION_KIND_INTEGER: {
         intList *elem = NULL;
-        for (i = 0, elem = cvalue->u.integer; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.integer.data;
+             elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S8: {
         int8List *elem = NULL;
-        for (i = 0, elem = cvalue->u.s8; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s8.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S16: {
         int16List *elem = NULL;
-        for (i = 0, elem = cvalue->u.s16; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s16.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S32: {
         int32List *elem = NULL;
-        for (i = 0, elem = cvalue->u.s32; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s32.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S64: {
         int64List *elem = NULL;
-        for (i = 0, elem = cvalue->u.s64; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.s64.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U8: {
         uint8List *elem = NULL;
-        for (i = 0, elem = cvalue->u.u8; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u8.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U16: {
         uint16List *elem = NULL;
-        for (i = 0, elem = cvalue->u.u16; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u16.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U32: {
         uint32List *elem = NULL;
-        for (i = 0, elem = cvalue->u.u32; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u32.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U64: {
         uint64List *elem = NULL;
-        for (i = 0, elem = cvalue->u.u64; elem; elem = elem->next, i++) {
+        for (i = 0, elem = cvalue->u.u64.data; elem; elem = elem->next, i++) {
             g_assert_cmpint(elem->value, ==, i);
         }
         break;
@@ -635,7 +636,7 @@  static void test_visitor_in_native_list_bool(TestInputVisitorData *data,
     g_assert(cvalue != NULL);
     g_assert_cmpint(cvalue->type, ==, USER_DEF_NATIVE_LIST_UNION_KIND_BOOLEAN);

-    for (i = 0, elem = cvalue->u.boolean; elem; elem = elem->next, i++) {
+    for (i = 0, elem = cvalue->u.boolean.data; elem; elem = elem->next, i++) {
         g_assert_cmpint(elem->value, ==, (i % 3 == 0) ? 1 : 0);
     }

@@ -668,7 +669,7 @@  static void test_visitor_in_native_list_string(TestInputVisitorData *data,
     g_assert(cvalue != NULL);
     g_assert_cmpint(cvalue->type, ==, USER_DEF_NATIVE_LIST_UNION_KIND_STRING);

-    for (i = 0, elem = cvalue->u.string; elem; elem = elem->next, i++) {
+    for (i = 0, elem = cvalue->u.string.data; elem; elem = elem->next, i++) {
         gchar str[8];
         sprintf(str, "%d", i);
         g_assert_cmpstr(elem->value, ==, str);
@@ -705,7 +706,7 @@  static void test_visitor_in_native_list_number(TestInputVisitorData *data,
     g_assert(cvalue != NULL);
     g_assert_cmpint(cvalue->type, ==, USER_DEF_NATIVE_LIST_UNION_KIND_NUMBER);

-    for (i = 0, elem = cvalue->u.number; elem; elem = elem->next, i++) {
+    for (i = 0, elem = cvalue->u.number.data; elem; elem = elem->next, i++) {
         GString *double_expected = g_string_new("");
         GString *double_actual = g_string_new("");

diff --git a/tests/test-qmp-output-visitor.c b/tests/test-qmp-output-visitor.c
index a7f8b45..dc35752 100644
--- a/tests/test-qmp-output-visitor.c
+++ b/tests/test-qmp-output-visitor.c
@@ -493,7 +493,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
     int i;
     switch (cvalue->type) {
     case USER_DEF_NATIVE_LIST_UNION_KIND_INTEGER: {
-        intList **list = &cvalue->u.integer;
+        intList **list = &cvalue->u.integer.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(intList, 1);
             (*list)->value = i;
@@ -503,7 +503,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S8: {
-        int8List **list = &cvalue->u.s8;
+        int8List **list = &cvalue->u.s8.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int8List, 1);
             (*list)->value = i;
@@ -513,7 +513,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S16: {
-        int16List **list = &cvalue->u.s16;
+        int16List **list = &cvalue->u.s16.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int16List, 1);
             (*list)->value = i;
@@ -523,7 +523,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S32: {
-        int32List **list = &cvalue->u.s32;
+        int32List **list = &cvalue->u.s32.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int32List, 1);
             (*list)->value = i;
@@ -533,7 +533,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_S64: {
-        int64List **list = &cvalue->u.s64;
+        int64List **list = &cvalue->u.s64.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(int64List, 1);
             (*list)->value = i;
@@ -543,7 +543,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U8: {
-        uint8List **list = &cvalue->u.u8;
+        uint8List **list = &cvalue->u.u8.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint8List, 1);
             (*list)->value = i;
@@ -553,7 +553,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U16: {
-        uint16List **list = &cvalue->u.u16;
+        uint16List **list = &cvalue->u.u16.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint16List, 1);
             (*list)->value = i;
@@ -563,7 +563,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U32: {
-        uint32List **list = &cvalue->u.u32;
+        uint32List **list = &cvalue->u.u32.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint32List, 1);
             (*list)->value = i;
@@ -573,7 +573,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_U64: {
-        uint64List **list = &cvalue->u.u64;
+        uint64List **list = &cvalue->u.u64.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(uint64List, 1);
             (*list)->value = i;
@@ -583,7 +583,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_BOOLEAN: {
-        boolList **list = &cvalue->u.boolean;
+        boolList **list = &cvalue->u.boolean.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(boolList, 1);
             (*list)->value = (i % 3 == 0);
@@ -593,7 +593,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_STRING: {
-        strList **list = &cvalue->u.string;
+        strList **list = &cvalue->u.string.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(strList, 1);
             (*list)->value = g_strdup_printf("%d", i);
@@ -603,7 +603,7 @@  static void init_native_list(UserDefNativeListUnion *cvalue)
         break;
     }
     case USER_DEF_NATIVE_LIST_UNION_KIND_NUMBER: {
-        numberList **list = &cvalue->u.number;
+        numberList **list = &cvalue->u.number.data;
         for (i = 0; i < 32; i++) {
             *list = g_new0(numberList, 1);
             (*list)->value = (double)i / 3;
diff --git a/tpm.c b/tpm.c
index 9ed708e..9a7c711 100644
--- a/tpm.c
+++ b/tpm.c
@@ -262,7 +262,7 @@  static TPMInfo *qmp_query_tpm_inst(TPMBackend *drv)
     case TPM_TYPE_PASSTHROUGH:
         res->options->type = TPM_TYPE_OPTIONS_KIND_PASSTHROUGH;
         tpo = g_new0(TPMPassthroughOptions, 1);
-        res->options->u.passthrough = tpo;
+        res->options->u.passthrough.data = tpo;
         if (drv->path) {
             tpo->path = g_strdup(drv->path);
             tpo->has_path = true;
diff --git a/ui/console.c b/ui/console.c
index 8027ba7..1fd4ea4 100644
--- a/ui/console.c
+++ b/ui/console.c
@@ -2069,7 +2069,7 @@  static VcHandler *vc_handler = text_console_init;
 static CharDriverState *vc_init(const char *id, ChardevBackend *backend,
                                 ChardevReturn *ret, Error **errp)
 {
-    return vc_handler(backend->u.vc, errp);
+    return vc_handler(backend->u.vc.data, errp);
 }

 void register_vc_handler(VcHandler *handler)
@@ -2111,7 +2111,7 @@  static void qemu_chr_parse_vc(QemuOpts *opts, ChardevBackend *backend,
     int val;
     ChardevVC *vc;

-    vc = backend->u.vc = g_new0(ChardevVC, 1);
+    vc = backend->u.vc.data = g_new0(ChardevVC, 1);
     qemu_chr_parse_common(opts, qapi_ChardevVC_base(vc));

     val = qemu_opt_get_number(opts, "width", 0);
diff --git a/ui/input-keymap.c b/ui/input-keymap.c
index fd2c09d..f1e700d 100644
--- a/ui/input-keymap.c
+++ b/ui/input-keymap.c
@@ -141,10 +141,10 @@  static int number_to_qcode[0x100];
 int qemu_input_key_value_to_number(const KeyValue *value)
 {
     if (value->type == KEY_VALUE_KIND_QCODE) {
-        return qcode_to_number[value->u.qcode];
+        return qcode_to_number[value->u.qcode.data];
     } else {
         assert(value->type == KEY_VALUE_KIND_NUMBER);
-        return value->u.number;
+        return value->u.number.data;
     }
 }

@@ -168,10 +168,10 @@  int qemu_input_key_number_to_qcode(uint8_t nr)
 int qemu_input_key_value_to_qcode(const KeyValue *value)
 {
     if (value->type == KEY_VALUE_KIND_QCODE) {
-        return value->u.qcode;
+        return value->u.qcode.data;
     } else {
         assert(value->type == KEY_VALUE_KIND_NUMBER);
-        return qemu_input_key_number_to_qcode(value->u.number);
+        return qemu_input_key_number_to_qcode(value->u.number.data);
     }
 }

@@ -182,7 +182,7 @@  int qemu_input_key_value_to_scancode(const KeyValue *value, bool down,
     int count = 0;

     if (value->type == KEY_VALUE_KIND_QCODE &&
-        value->u.qcode == Q_KEY_CODE_PAUSE) {
+        value->u.qcode.data == Q_KEY_CODE_PAUSE) {
         /* specific case */
         int v = down ? 0 : 0x80;
         codes[count++] = 0xe1;
diff --git a/ui/input-legacy.c b/ui/input-legacy.c
index f1c5cb4..7159747 100644
--- a/ui/input-legacy.c
+++ b/ui/input-legacy.c
@@ -110,7 +110,7 @@  static void legacy_kbd_event(DeviceState *dev, QemuConsole *src,
 {
     QEMUPutKbdEntry *entry = (QEMUPutKbdEntry *)dev;
     int scancodes[3], i, count;
-    InputKeyEvent *key = evt->u.key;
+    InputKeyEvent *key = evt->u.key.data;

     if (!entry || !entry->put_kbd) {
         return;
@@ -156,7 +156,7 @@  static void legacy_mouse_event(DeviceState *dev, QemuConsole *src,

     switch (evt->type) {
     case INPUT_EVENT_KIND_BTN:
-        btn = evt->u.btn;
+        btn = evt->u.btn.data;
         if (btn->down) {
             s->buttons |= bmap[btn->button];
         } else {
@@ -178,11 +178,11 @@  static void legacy_mouse_event(DeviceState *dev, QemuConsole *src,
         }
         break;
     case INPUT_EVENT_KIND_ABS:
-        move = evt->u.abs;
+        move = evt->u.abs.data;
         s->axis[move->axis] = move->value;
         break;
     case INPUT_EVENT_KIND_REL:
-        move = evt->u.rel;
+        move = evt->u.rel.data;
         s->axis[move->axis] += move->value;
         break;
     default:
diff --git a/ui/input.c b/ui/input.c
index b035f86..ed88cda 100644
--- a/ui/input.c
+++ b/ui/input.c
@@ -166,7 +166,7 @@  void qmp_input_send_event(bool has_device, const char *device,

 static void qemu_input_transform_abs_rotate(InputEvent *evt)
 {
-    InputMoveEvent *move = evt->u.abs;
+    InputMoveEvent *move = evt->u.abs.data;
     switch (graphic_rotate) {
     case 90:
         if (move->axis == INPUT_AXIS_X) {
@@ -203,16 +203,16 @@  static void qemu_input_event_trace(QemuConsole *src, InputEvent *evt)
     }
     switch (evt->type) {
     case INPUT_EVENT_KIND_KEY:
-        key = evt->u.key;
+        key = evt->u.key.data;
         switch (key->key->type) {
         case KEY_VALUE_KIND_NUMBER:
-            qcode = qemu_input_key_number_to_qcode(key->key->u.number);
+            qcode = qemu_input_key_number_to_qcode(key->key->u.number.data);
             name = QKeyCode_lookup[qcode];
-            trace_input_event_key_number(idx, key->key->u.number,
+            trace_input_event_key_number(idx, key->key->u.number.data,
                                          name, key->down);
             break;
         case KEY_VALUE_KIND_QCODE:
-            name = QKeyCode_lookup[key->key->u.qcode];
+            name = QKeyCode_lookup[key->key->u.qcode.data];
             trace_input_event_key_qcode(idx, name, key->down);
             break;
         case KEY_VALUE_KIND__MAX:
@@ -221,17 +221,17 @@  static void qemu_input_event_trace(QemuConsole *src, InputEvent *evt)
         }
         break;
     case INPUT_EVENT_KIND_BTN:
-        btn = evt->u.btn;
+        btn = evt->u.btn.data;
         name = InputButton_lookup[btn->button];
         trace_input_event_btn(idx, name, btn->down);
         break;
     case INPUT_EVENT_KIND_REL:
-        move = evt->u.rel;
+        move = evt->u.rel.data;
         name = InputAxis_lookup[move->axis];
         trace_input_event_rel(idx, name, move->value);
         break;
     case INPUT_EVENT_KIND_ABS:
-        move = evt->u.abs;
+        move = evt->u.abs.data;
         name = InputAxis_lookup[move->axis];
         trace_input_event_abs(idx, name, move->value);
         break;
@@ -366,10 +366,10 @@  void qemu_input_event_sync(void)
 InputEvent *qemu_input_event_new_key(KeyValue *key, bool down)
 {
     InputEvent *evt = g_new0(InputEvent, 1);
-    evt->u.key = g_new0(InputKeyEvent, 1);
+    evt->u.key.data = g_new0(InputKeyEvent, 1);
     evt->type = INPUT_EVENT_KIND_KEY;
-    evt->u.key->key = key;
-    evt->u.key->down = down;
+    evt->u.key.data->key = key;
+    evt->u.key.data->down = down;
     return evt;
 }

@@ -391,7 +391,7 @@  void qemu_input_event_send_key_number(QemuConsole *src, int num, bool down)
 {
     KeyValue *key = g_new0(KeyValue, 1);
     key->type = KEY_VALUE_KIND_NUMBER;
-    key->u.number = num;
+    key->u.number.data = num;
     qemu_input_event_send_key(src, key, down);
 }

@@ -399,7 +399,7 @@  void qemu_input_event_send_key_qcode(QemuConsole *src, QKeyCode q, bool down)
 {
     KeyValue *key = g_new0(KeyValue, 1);
     key->type = KEY_VALUE_KIND_QCODE;
-    key->u.qcode = q;
+    key->u.qcode.data = q;
     qemu_input_event_send_key(src, key, down);
 }

@@ -416,10 +416,10 @@  void qemu_input_event_send_key_delay(uint32_t delay_ms)
 InputEvent *qemu_input_event_new_btn(InputButton btn, bool down)
 {
     InputEvent *evt = g_new0(InputEvent, 1);
-    evt->u.btn = g_new0(InputBtnEvent, 1);
+    evt->u.btn.data = g_new0(InputBtnEvent, 1);
     evt->type = INPUT_EVENT_KIND_BTN;
-    evt->u.btn->button = btn;
-    evt->u.btn->down = down;
+    evt->u.btn.data->button = btn;
+    evt->u.btn.data->down = down;
     return evt;
 }

@@ -470,7 +470,7 @@  InputEvent *qemu_input_event_new_move(InputEventKind kind,
     InputMoveEvent *move = g_new0(InputMoveEvent, 1);

     evt->type = kind;
-    evt->u.rel = move; /* evt->u.rel is the same as evt->u.abs */
+    evt->u.rel.data = move; /* evt->u.rel is the same as evt->u.abs */
     move->axis = axis;
     move->value = value;
     return evt;
diff --git a/ui/vnc-auth-sasl.c b/ui/vnc-auth-sasl.c
index 13a59f5..56e45e3 100644
--- a/ui/vnc-auth-sasl.c
+++ b/ui/vnc-auth-sasl.c
@@ -513,7 +513,8 @@  vnc_socket_ip_addr_string(QIOChannelSocket *ioc,
         error_setg(errp, "Not an inet socket type");
         return NULL;
     }
-    ret = g_strdup_printf("%s;%s", addr->u.inet->host, addr->u.inet->port);
+    ret = g_strdup_printf("%s;%s", addr->u.inet.data->host,
+                          addr->u.inet.data->port);
     qapi_free_SocketAddress(addr);
     return ret;
 }
diff --git a/ui/vnc.c b/ui/vnc.c
index 9494a19..6d39ddd 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -112,9 +112,9 @@  static void vnc_init_basic_info(SocketAddress *addr,
 {
     switch (addr->type) {
     case SOCKET_ADDRESS_KIND_INET:
-        info->host = g_strdup(addr->u.inet->host);
-        info->service = g_strdup(addr->u.inet->port);
-        if (addr->u.inet->ipv6) {
+        info->host = g_strdup(addr->u.inet.data->host);
+        info->service = g_strdup(addr->u.inet.data->port);
+        if (addr->u.inet.data->ipv6) {
             info->family = NETWORK_ADDRESS_FAMILY_IPV6;
         } else {
             info->family = NETWORK_ADDRESS_FAMILY_IPV4;
@@ -123,7 +123,7 @@  static void vnc_init_basic_info(SocketAddress *addr,

     case SOCKET_ADDRESS_KIND_UNIX:
         info->host = g_strdup("");
-        info->service = g_strdup(addr->u.q_unix->path);
+        info->service = g_strdup(addr->u.q_unix.data->path);
         info->family = NETWORK_ADDRESS_FAMILY_UNIX;
         break;

@@ -385,9 +385,9 @@  VncInfo *qmp_query_vnc(Error **errp)

         switch (addr->type) {
         case SOCKET_ADDRESS_KIND_INET:
-            info->host = g_strdup(addr->u.inet->host);
-            info->service = g_strdup(addr->u.inet->port);
-            if (addr->u.inet->ipv6) {
+            info->host = g_strdup(addr->u.inet.data->host);
+            info->service = g_strdup(addr->u.inet.data->port);
+            if (addr->u.inet.data->ipv6) {
                 info->family = NETWORK_ADDRESS_FAMILY_IPV6;
             } else {
                 info->family = NETWORK_ADDRESS_FAMILY_IPV4;
@@ -396,7 +396,7 @@  VncInfo *qmp_query_vnc(Error **errp)

         case SOCKET_ADDRESS_KIND_UNIX:
             info->host = g_strdup("");
-            info->service = g_strdup(addr->u.q_unix->path);
+            info->service = g_strdup(addr->u.q_unix.data->path);
             info->family = NETWORK_ADDRESS_FAMILY_UNIX;
             break;

@@ -3192,7 +3192,8 @@  char *vnc_display_local_addr(const char *id)
         qapi_free_SocketAddress(addr);
         return NULL;
     }
-    ret = g_strdup_printf("%s;%s", addr->u.inet->host, addr->u.inet->port);
+    ret = g_strdup_printf("%s;%s", addr->u.inet.data->host,
+                          addr->u.inet.data->port);
     qapi_free_SocketAddress(addr);

     return ret;
@@ -3524,8 +3525,8 @@  void vnc_display_open(const char *id, Error **errp)

         if (strncmp(vnc, "unix:", 5) == 0) {
             saddr->type = SOCKET_ADDRESS_KIND_UNIX;
-            saddr->u.q_unix = g_new0(UnixSocketAddress, 1);
-            saddr->u.q_unix->path = g_strdup(vnc + 5);
+            saddr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
+            saddr->u.q_unix.data->path = g_strdup(vnc + 5);

             if (vs->ws_enabled) {
                 error_setg(errp, "UNIX sockets not supported with websock");
@@ -3535,7 +3536,7 @@  void vnc_display_open(const char *id, Error **errp)
             unsigned long long baseport;
             InetSocketAddress *inet;
             saddr->type = SOCKET_ADDRESS_KIND_INET;
-            inet = saddr->u.inet = g_new0(InetSocketAddress, 1);
+            inet = saddr->u.inet.data = g_new0(InetSocketAddress, 1);
             if (vnc[0] == '[' && vnc[hlen - 1] == ']') {
                 inet->host = g_strndup(vnc + 1, hlen - 2);
             } else {
@@ -3564,8 +3565,8 @@  void vnc_display_open(const char *id, Error **errp)

             if (vs->ws_enabled) {
                 wsaddr->type = SOCKET_ADDRESS_KIND_INET;
-                inet = wsaddr->u.inet = g_new0(InetSocketAddress, 1);
-                inet->host = g_strdup(saddr->u.inet->host);
+                inet = wsaddr->u.inet.data = g_new0(InetSocketAddress, 1);
+                inet->host = g_strdup(saddr->u.inet.data->host);
                 inet->port = g_strdup(websocket);

                 if (to) {
diff --git a/util/qemu-sockets.c b/util/qemu-sockets.c
index fd37ac2..540649a 100644
--- a/util/qemu-sockets.c
+++ b/util/qemu-sockets.c
@@ -901,8 +901,8 @@  SocketAddress *socket_parse(const char *str, Error **errp)
             goto fail;
         } else {
             addr->type = SOCKET_ADDRESS_KIND_UNIX;
-            addr->u.q_unix = g_new(UnixSocketAddress, 1);
-            addr->u.q_unix->path = g_strdup(str + 5);
+            addr->u.q_unix.data = g_new(UnixSocketAddress, 1);
+            addr->u.q_unix.data->path = g_strdup(str + 5);
         }
     } else if (strstart(str, "fd:", NULL)) {
         if (str[3] == '\0') {
@@ -910,13 +910,13 @@  SocketAddress *socket_parse(const char *str, Error **errp)
             goto fail;
         } else {
             addr->type = SOCKET_ADDRESS_KIND_FD;
-            addr->u.fd = g_new(String, 1);
-            addr->u.fd->str = g_strdup(str + 3);
+            addr->u.fd.data = g_new(String, 1);
+            addr->u.fd.data->str = g_strdup(str + 3);
         }
     } else {
         addr->type = SOCKET_ADDRESS_KIND_INET;
-        addr->u.inet = inet_parse(str, errp);
-        if (addr->u.inet == NULL) {
+        addr->u.inet.data = inet_parse(str, errp);
+        if (addr->u.inet.data == NULL) {
             goto fail;
         }
     }
@@ -934,15 +934,15 @@  int socket_connect(SocketAddress *addr, Error **errp,

     switch (addr->type) {
     case SOCKET_ADDRESS_KIND_INET:
-        fd = inet_connect_saddr(addr->u.inet, errp, callback, opaque);
+        fd = inet_connect_saddr(addr->u.inet.data, errp, callback, opaque);
         break;

     case SOCKET_ADDRESS_KIND_UNIX:
-        fd = unix_connect_saddr(addr->u.q_unix, errp, callback, opaque);
+        fd = unix_connect_saddr(addr->u.q_unix.data, errp, callback, opaque);
         break;

     case SOCKET_ADDRESS_KIND_FD:
-        fd = monitor_get_fd(cur_mon, addr->u.fd->str, errp);
+        fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
         if (fd >= 0 && callback) {
             qemu_set_nonblock(fd);
             callback(fd, NULL, opaque);
@@ -961,15 +961,15 @@  int socket_listen(SocketAddress *addr, Error **errp)

     switch (addr->type) {
     case SOCKET_ADDRESS_KIND_INET:
-        fd = inet_listen_saddr(addr->u.inet, 0, false, errp);
+        fd = inet_listen_saddr(addr->u.inet.data, 0, false, errp);
         break;

     case SOCKET_ADDRESS_KIND_UNIX:
-        fd = unix_listen_saddr(addr->u.q_unix, false, errp);
+        fd = unix_listen_saddr(addr->u.q_unix.data, false, errp);
         break;

     case SOCKET_ADDRESS_KIND_FD:
-        fd = monitor_get_fd(cur_mon, addr->u.fd->str, errp);
+        fd = monitor_get_fd(cur_mon, addr->u.fd.data->str, errp);
         break;

     default:
@@ -984,7 +984,8 @@  int socket_dgram(SocketAddress *remote, SocketAddress *local, Error **errp)

     switch (remote->type) {
     case SOCKET_ADDRESS_KIND_INET:
-        fd = inet_dgram_saddr(remote->u.inet, local ? local->u.inet : NULL, errp);
+        fd = inet_dgram_saddr(remote->u.inet.data,
+                              local ? local->u.inet.data : NULL, errp);
         break;

     default:
@@ -1018,7 +1019,7 @@  socket_sockaddr_to_address_inet(struct sockaddr_storage *sa,

     addr = g_new0(SocketAddress, 1);
     addr->type = SOCKET_ADDRESS_KIND_INET;
-    inet = addr->u.inet = g_new0(InetSocketAddress, 1);
+    inet = addr->u.inet.data = g_new0(InetSocketAddress, 1);
     inet->host = g_strdup(host);
     inet->port = g_strdup(serv);
     if (sa->ss_family == AF_INET) {
@@ -1042,10 +1043,10 @@  socket_sockaddr_to_address_unix(struct sockaddr_storage *sa,

     addr = g_new0(SocketAddress, 1);
     addr->type = SOCKET_ADDRESS_KIND_UNIX;
-    addr->u.q_unix = g_new0(UnixSocketAddress, 1);
+    addr->u.q_unix.data = g_new0(UnixSocketAddress, 1);
     if (su->sun_path[0]) {
-        addr->u.q_unix->path = g_strndup(su->sun_path,
-                                         sizeof(su->sun_path));
+        addr->u.q_unix.data->path = g_strndup(su->sun_path,
+                                              sizeof(su->sun_path));
     }

     return addr;