Merge remote-tracking branch 'qmp/queue/qmp' into staging

* qmp/queue/qmp: (48 commits)
  target-ppc: add implementation of query-cpu-definitions (v2)
  target-i386: add implementation of query-cpu-definitions (v2)
  qapi: add query-cpu-definitions command (v2)
  compiler: add macro for GCC weak symbols
  qapi: add query-machines command
  qapi: mark QOM commands stable
  qmp: introduce device-list-properties command
  qmp: add SUSPEND_DISK event
  qmp: qmp-events.txt: add missing doc for the SUSPEND event
  qmp: qmp-events.txt: put events in alphabetical order
  qmp: emit the WAKEUP event when the guest is put to run
  qmp: don't emit the RESET event on wakeup from S3
  scripts: qapi-commands.py: qmp-commands.h: include qdict.h
  docs: writing-qmp-commands.txt: update error section
  error, qerror: drop QDict member
  qerror: drop qerror_table and qerror_format()
  error, qerror: pass desc string to error calls
  error: drop error_get_qobject()/error_set_qobject()
  qemu-ga: switch to the new error format on the wire
  qmp: switch to the new error format on the wire
  ...

35 files changed, 689 insertions, 1119 deletions

diff --git a/Makefile.objs b/Makefile.objs
index e0fb69b202..309d066286 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -212,6 +212,7 @@ common-obj-$(CONFIG_SMARTCARD_NSS) += $(libcacard-y)
 # qapi
 
 qapi-obj-y = qapi/
+qapi-obj-y += qapi-types.o qapi-visit.o
 
 common-obj-y += qmp-marshal.o qapi-visit.o qapi-types.o
 common-obj-y += qmp.o hmp.o
diff --git a/QMP/qmp-events.txt b/QMP/qmp-events.txt
index 9ba7079589..287805825f 100644
--- a/QMP/qmp-events.txt
+++ b/QMP/qmp-events.txt
@@ -1,6 +1,23 @@
                    QEMU Monitor Protocol Events
                    ============================
 
+BALLOON_CHANGE
+--------------
+
+Emitted when the guest changes the actual BALLOON level. This
+value is equivalent to the 'actual' field return by the
+'query-balloon' command
+
+Data:
+
+- "actual": actual level of the guest memory balloon in bytes (json-number)
+
+Example:
+
+{ "event": "BALLOON_CHANGE",
+    "data": { "actual": 944766976 },
+    "timestamp": { "seconds": 1267020223, "microseconds": 435656 } }
+
 BLOCK_IO_ERROR
 --------------
 
@@ -26,6 +43,57 @@ Example:
 Note: If action is "stop", a STOP event will eventually follow the
 BLOCK_IO_ERROR event.
 
+BLOCK_JOB_CANCELLED
+-------------------
+
+Emitted when a block job has been cancelled.
+
+Data:
+
+- "type":     Job type ("stream" for image streaming, json-string)
+- "device":   Device name (json-string)
+- "len":      Maximum progress value (json-int)
+- "offset":   Current progress value (json-int)
+              On success this is equal to len.
+              On failure this is less than len.
+- "speed":    Rate limit, bytes per second (json-int)
+
+Example:
+
+{ "event": "BLOCK_JOB_CANCELLED",
+     "data": { "type": "stream", "device": "virtio-disk0",
+               "len": 10737418240, "offset": 134217728,
+               "speed": 0 },
+     "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }
+
+BLOCK_JOB_COMPLETED
+-------------------
+
+Emitted when a block job has completed.
+
+Data:
+
+- "type":     Job type ("stream" for image streaming, json-string)
+- "device":   Device name (json-string)
+- "len":      Maximum progress value (json-int)
+- "offset":   Current progress value (json-int)
+              On success this is equal to len.
+              On failure this is less than len.
+- "speed":    Rate limit, bytes per second (json-int)
+- "error":    Error message (json-string, optional)
+              Only present on failure.  This field contains a human-readable
+              error message.  There are no semantics other than that streaming
+              has failed and clients should not try to interpret the error
+              string.
+
+Example:
+
+{ "event": "BLOCK_JOB_COMPLETED",
+     "data": { "type": "stream", "device": "virtio-disk0",
+               "len": 10737418240, "offset": 10737418240,
+               "speed": 0 },
+     "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }
+
 DEVICE_TRAY_MOVED
 -----------------
 
@@ -98,6 +166,68 @@ Example:
 Note: If the command-line option "-no-shutdown" has been specified, a STOP
 event will eventually follow the SHUTDOWN event.
 
+SPICE_CONNECTED, SPICE_DISCONNECTED
+-----------------------------------
+
+Emitted when a SPICE client connects or disconnects.
+
+Data:
+
+- "server": Server information (json-object)
+  - "host": IP address (json-string)
+  - "port": port number (json-string)
+  - "family": address family (json-string, "ipv4" or "ipv6")
+- "client": Client information (json-object)
+  - "host": IP address (json-string)
+  - "port": port number (json-string)
+  - "family": address family (json-string, "ipv4" or "ipv6")
+
+Example:
+
+{ "timestamp": {"seconds": 1290688046, "microseconds": 388707},
+  "event": "SPICE_CONNECTED",
+  "data": {
+    "server": { "port": "5920", "family": "ipv4", "host": "127.0.0.1"},
+    "client": {"port": "52873", "family": "ipv4", "host": "127.0.0.1"}
+}}
+
+SPICE_INITIALIZED
+-----------------
+
+Emitted after initial handshake and authentication takes place (if any)
+and the SPICE channel is up'n'running
+
+Data:
+
+- "server": Server information (json-object)
+  - "host": IP address (json-string)
+  - "port": port number (json-string)
+  - "family": address family (json-string, "ipv4" or "ipv6")
+  - "auth": authentication method (json-string, optional)
+- "client": Client information (json-object)
+  - "host": IP address (json-string)
+  - "port": port number (json-string)
+  - "family": address family (json-string, "ipv4" or "ipv6")
+  - "connection-id": spice connection id.  All channels with the same id
+                     belong to the same spice session (json-int)
+  - "channel-type": channel type.  "1" is the main control channel, filter for
+                    this one if you want track spice sessions only (json-int)
+  - "channel-id": channel id.  Usually "0", might be different needed when
+                  multiple channels of the same type exist, such as multiple
+                  display channels in a multihead setup (json-int)
+  - "tls": whevener the channel is encrypted (json-bool)
+
+Example:
+
+{ "timestamp": {"seconds": 1290688046, "microseconds": 417172},
+  "event": "SPICE_INITIALIZED",
+  "data": {"server": {"auth": "spice", "port": "5921",
+                      "family": "ipv4", "host": "127.0.0.1"},
+           "client": {"port": "49004", "family": "ipv4", "channel-type": 3,
+                      "connection-id": 1804289383, "host": "127.0.0.1",
+                      "channel-id": 0, "tls": true}
+}}
+
 STOP
 ----
 
@@ -110,6 +240,32 @@ Example:
 { "event": "STOP",
     "timestamp": { "seconds": 1267041730, "microseconds": 281295 } }
 
+SUSPEND
+-------
+
+Emitted when guest enters S3 state.
+
+Data: None.
+
+Example:
+
+{ "event": "SUSPEND",
+     "timestamp": { "seconds": 1344456160, "microseconds": 309119 } }
+
+SUSPEND_DISK
+------------
+
+Emitted when the guest makes a request to enter S4 state.
+
+Data: None.
+
+Example:
+
+{ "event": "SUSPEND_DISK",
+     "timestamp": { "seconds": 1344456160, "microseconds": 309119 } }
+
+Note: QEMU shuts down when entering S4 state.
+
 VNC_CONNECTED
 -------------
 
@@ -200,69 +356,17 @@ Example:
                     "host": "127.0.0.1", "sasl_username": "luiz" } },
         "timestamp": { "seconds": 1263475302, "microseconds": 150772 } }
 
-SPICE_CONNECTED, SPICE_DISCONNECTED
------------------------------------
-
-Emitted when a SPICE client connects or disconnects.
-
-Data:
-
-- "server": Server information (json-object)
-  - "host": IP address (json-string)
-  - "port": port number (json-string)
-  - "family": address family (json-string, "ipv4" or "ipv6")
-- "client": Client information (json-object)
-  - "host": IP address (json-string)
-  - "port": port number (json-string)
-  - "family": address family (json-string, "ipv4" or "ipv6")
-
-Example:
-
-{ "timestamp": {"seconds": 1290688046, "microseconds": 388707},
-  "event": "SPICE_CONNECTED",
-  "data": {
-    "server": { "port": "5920", "family": "ipv4", "host": "127.0.0.1"},
-    "client": {"port": "52873", "family": "ipv4", "host": "127.0.0.1"}
-}}
-
-
-SPICE_INITIALIZED
------------------
-
-Emitted after initial handshake and authentication takes place (if any)
-and the SPICE channel is up'n'running
+WAKEUP
+------
 
-Data:
+Emitted when the guest has woken up from S3 and is running.
 
-- "server": Server information (json-object)
-  - "host": IP address (json-string)
-  - "port": port number (json-string)
-  - "family": address family (json-string, "ipv4" or "ipv6")
-  - "auth": authentication method (json-string, optional)
-- "client": Client information (json-object)
-  - "host": IP address (json-string)
-  - "port": port number (json-string)
-  - "family": address family (json-string, "ipv4" or "ipv6")
-  - "connection-id": spice connection id.  All channels with the same id
-                     belong to the same spice session (json-int)
-  - "channel-type": channel type.  "1" is the main control channel, filter for
-                    this one if you want track spice sessions only (json-int)
-  - "channel-id": channel id.  Usually "0", might be different needed when
-                  multiple channels of the same type exist, such as multiple
-                  display channels in a multihead setup (json-int)
-  - "tls": whevener the channel is encrypted (json-bool)
+Data: None.
 
 Example:
 
-{ "timestamp": {"seconds": 1290688046, "microseconds": 417172},
-  "event": "SPICE_INITIALIZED",
-  "data": {"server": {"auth": "spice", "port": "5921",
-                      "family": "ipv4", "host": "127.0.0.1"},
-           "client": {"port": "49004", "family": "ipv4", "channel-type": 3,
-                      "connection-id": 1804289383, "host": "127.0.0.1",
-                      "channel-id": 0, "tls": true}
-}}
-
+{ "event": "WATCHDOG",
+     "timestamp": { "seconds": 1344522075, "microseconds": 745528 } }
 
 WATCHDOG
 --------
@@ -282,74 +386,3 @@ Example:
 
 Note: If action is "reset", "shutdown", or "pause" the WATCHDOG event is
 followed respectively by the RESET, SHUTDOWN, or STOP events.
-
-
-BLOCK_JOB_COMPLETED
--------------------
-
-Emitted when a block job has completed.
-
-Data:
-
-- "type":     Job type ("stream" for image streaming, json-string)
-- "device":   Device name (json-string)
-- "len":      Maximum progress value (json-int)
-- "offset":   Current progress value (json-int)
-              On success this is equal to len.
-              On failure this is less than len.
-- "speed":    Rate limit, bytes per second (json-int)
-- "error":    Error message (json-string, optional)
-              Only present on failure.  This field contains a human-readable
-              error message.  There are no semantics other than that streaming
-              has failed and clients should not try to interpret the error
-              string.
-
-Example:
-
-{ "event": "BLOCK_JOB_COMPLETED",
-     "data": { "type": "stream", "device": "virtio-disk0",
-               "len": 10737418240, "offset": 10737418240,
-               "speed": 0 },
-     "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }
-
-
-BLOCK_JOB_CANCELLED
--------------------
-
-Emitted when a block job has been cancelled.
-
-Data:
-
-- "type":     Job type ("stream" for image streaming, json-string)
-- "device":   Device name (json-string)
-- "len":      Maximum progress value (json-int)
-- "offset":   Current progress value (json-int)
-              On success this is equal to len.
-              On failure this is less than len.
-- "speed":    Rate limit, bytes per second (json-int)
-
-Example:
-
-{ "event": "BLOCK_JOB_CANCELLED",
-     "data": { "type": "stream", "device": "virtio-disk0",
-               "len": 10737418240, "offset": 134217728,
-               "speed": 0 },
-     "timestamp": { "seconds": 1267061043, "microseconds": 959568 } }
-
-
-BALLOON_CHANGE
-----------
-
-Emitted when the guest changes the actual BALLOON level. This
-value is equivalent to the 'actual' field return by the
-'query-balloon' command
-
-Data:
-
-- "actual": actual level of the guest memory balloon in bytes (json-number)
-
-Example:
-
-{ "event": "BALLOON_CHANGE",
-    "data": { "actual": 944766976 },
-    "timestamp": { "seconds": 1267020223, "microseconds": 435656 } }
diff --git a/QMP/qmp-spec.txt b/QMP/qmp-spec.txt
index 1ba916c9f2..a27789692b 100644
--- a/QMP/qmp-spec.txt
+++ b/QMP/qmp-spec.txt
@@ -106,14 +106,11 @@ completed because of an error condition.
 
 The format is:
 
-{ "error": { "class": json-string, "data": json-object, "desc": json-string },
-  "id": json-value }
+{ "error": { "class": json-string, "desc": json-string }, "id": json-value }
 
  Where,
 
-- The "class" member contains the error class name (eg. "ServiceUnavailable")
-- The "data" member contains specific error data and is defined in a
-  per-command basis, it will be an empty json-object if the error has no data
+- The "class" member contains the error class name (eg. "GenericError")
 - The "desc" member is a human-readable error message. Clients should
   not attempt to parse this message.
 - The "id" member contains the transaction identification associated with
@@ -173,8 +170,7 @@ S: {"return": {"enabled": true, "present": true}, "id": "example"}
 ------------------
 
 C: { "execute": }
-S: {"error": {"class": "JSONParsing", "desc": "Invalid JSON syntax", "data":
-{}}}
+S: {"error": {"class": "GenericError", "desc": "Invalid JSON syntax" } }
 
 3.5 Powerdown event
 -------------------
diff --git a/block.c b/block.c
index 24323c11d0..016858bf8c 100644
--- a/block.c
+++ b/block.c
@@ -2445,6 +2445,7 @@ BlockInfoList *qmp_query_block(Error **errp)
             info->value->inserted->ro = bs->read_only;
             info->value->inserted->drv = g_strdup(bs->drv->format_name);
             info->value->inserted->encrypted = bs->encrypted;
+            info->value->inserted->encryption_key_missing = bdrv_key_required(bs);
             if (bs->backing_file[0]) {
                 info->value->inserted->has_backing_file = true;
                 info->value->inserted->backing_file = g_strdup(bs->backing_file);
diff --git a/block_int.h b/block_int.h
index 6c1d9cafb1..4452f6f398 100644
--- a/block_int.h
+++ b/block_int.h
@@ -30,6 +30,7 @@
 #include "qemu-coroutine.h"
 #include "qemu-timer.h"
 #include "qapi-types.h"
+#include "qerror.h"
 
 #define BLOCK_FLAG_ENCRYPT          1
 #define BLOCK_FLAG_COMPAT6          4
diff --git a/compiler.h b/compiler.h
index 736e77075a..f76921e5b0 100644
--- a/compiler.h
+++ b/compiler.h
@@ -45,6 +45,7 @@
 #  define GCC_ATTR __attribute__((__unused__, format(gnu_printf, 1, 2)))
 #  define GCC_FMT_ATTR(n, m) __attribute__((format(gnu_printf, n, m)))
 # endif
+#define GCC_WEAK __attribute__((weak))
 #else
 #define GCC_ATTR /**/
 #define GCC_FMT_ATTR(n, m)
diff --git a/configure b/configure
index 97b69a0d73..fea62f1d29 100755
--- a/configure
+++ b/configure
@@ -171,7 +171,6 @@ vhost_net="no"
 kvm="no"
 gprof="no"
 debug_tcg="no"
-debug_mon="no"
 debug="no"
 strip_opt="yes"
 tcg_interpreter="no"
@@ -657,14 +656,9 @@ for opt do
   ;;
   --disable-debug-tcg) debug_tcg="no"
   ;;
-  --enable-debug-mon) debug_mon="yes"
-  ;;
-  --disable-debug-mon) debug_mon="no"
-  ;;
   --enable-debug)
       # Enable debugging options that aren't excessively noisy
       debug_tcg="yes"
-      debug_mon="yes"
       debug="yes"
       strip_opt="no"
   ;;
@@ -3064,7 +3058,6 @@ echo "host CPU          $cpu"
 echo "host big endian   $bigendian"
 echo "target list       $target_list"
 echo "tcg debug enabled $debug_tcg"
-echo "Mon debug enabled $debug_mon"
 echo "gprof enabled     $gprof"
 echo "sparse enabled    $sparse"
 echo "strip binaries    $strip_opt"
@@ -3157,9 +3150,6 @@ echo "ARCH=$ARCH" >> $config_host_mak
 if test "$debug_tcg" = "yes" ; then
   echo "CONFIG_DEBUG_TCG=y" >> $config_host_mak
 fi
-if test "$debug_mon" = "yes" ; then
-  echo "CONFIG_DEBUG_MONITOR=y" >> $config_host_mak
-fi
 if test "$debug" = "yes" ; then
   echo "CONFIG_DEBUG_EXEC=y" >> $config_host_mak
 fi
diff --git a/docs/writing-qmp-commands.txt b/docs/writing-qmp-commands.txt
index 0ad51aa22a..8349dec8af 100644
--- a/docs/writing-qmp-commands.txt
+++ b/docs/writing-qmp-commands.txt
@@ -210,19 +210,17 @@ if you don't see these strings, then something went wrong.
 === Errors ===
 
 QMP commands should use the error interface exported by the error.h header
-file. The basic function used to set an error is the error_set() one.
+file. Basically, errors are set by calling the error_set() function.
 
 Let's say we don't accept the string "message" to contain the word "love". If
-it does contain it, we want the "hello-world" command to the return the
-InvalidParameter error.
-
-Only one change is required, and it's in the C implementation:
+it does contain it, we want the "hello-world" command to return an error:
 
 void qmp_hello_world(bool has_message, const char *message, Error **errp)
 {
     if (has_message) {
         if (strstr(message, "love")) {
-            error_set(errp, QERR_INVALID_PARAMETER, "message");
+            error_set(errp, ERROR_CLASS_GENERIC_ERROR,
+                      "the word 'love' is not allowed");
             return;
         }
         printf("%s\n", message);
@@ -231,30 +229,40 @@ void qmp_hello_world(bool has_message, const char *message, Error **errp)
     }
 }
 
-Let's test it. Build qemu, run it as defined in the "Testing" section, and
-then issue the following command:
+The first argument to the error_set() function is the Error pointer to pointer,
+which is passed to all QMP functions. The second argument is a ErrorClass
+value, which should be ERROR_CLASS_GENERIC_ERROR most of the time (more
+details about error classes are given below). The third argument is a human
+description of the error, this is a free-form printf-like string.
+
+Let's test the example above. Build qemu, run it as defined in the "Testing"
+section, and then issue the following command:
 
-{ "execute": "hello-world", "arguments": { "message": "we love qemu" } }
+{ "execute": "hello-world", "arguments": { "message": "all you need is love" } }
 
 The QMP server's response should be:
 
 {
     "error": {
-        "class": "InvalidParameter",
-        "desc": "Invalid parameter 'message'",
-        "data": {
-            "name": "message"
-        }
+        "class": "GenericError",
+        "desc": "the word 'love' is not allowed"
     }
 }
 
-Which is the InvalidParameter error.
+As a general rule, all QMP errors should use ERROR_CLASS_GENERIC_ERROR. There
+are two exceptions to this rule:
+
+ 1. A non-generic ErrorClass value exists* for the failure you want to report
+    (eg. DeviceNotFound)
+
+ 2. Management applications have to take special action on the failure you
+    want to report, hence you have to add a new ErrorClass value so that they
+    can check for it
 
-When you have to return an error but you're unsure what error to return or
-which arguments an error takes, you should look at the qerror.h file. Note
-that you might be required to add new errors if needed.
+If the failure you want to report doesn't fall in one of the two cases above,
+just report ERROR_CLASS_GENERIC_ERROR.
 
-FIXME: describe better the error API and how to add new errors.
+ * All existing ErrorClass values are defined in the qapi-schema.json file
 
 === Command Documentation ===
 
@@ -275,7 +283,6 @@ here goes "hello-world"'s new entry for the qapi-schema.json file:
 # @message: #optional string to be printed
 #
 # Returns: Nothing on success.
-#          If @message contains "love", InvalidParameter
 #
 # Notes: if @message is not provided, the "Hello, world" string will
 #        be printed instead
diff --git a/error.c b/error.c
index 58f55a012e..1f05fc466e 100644
--- a/error.c
+++ b/error.c
@@ -14,17 +14,16 @@
 #include "error.h"
 #include "qjson.h"
 #include "qdict.h"
-#include "error_int.h"
+#include "qapi-types.h"
 #include "qerror.h"
 
 struct Error
 {
-    QDict *obj;
-    const char *fmt;
     char *msg;
+    ErrorClass err_class;
 };
 
-void error_set(Error **errp, const char *fmt, ...)
+void error_set(Error **errp, ErrorClass err_class, const char *fmt, ...)
 {
     Error *err;
     va_list ap;
@@ -37,9 +36,9 @@ void error_set(Error **errp, const char *fmt, ...)
     err = g_malloc0(sizeof(*err));
 
     va_start(ap, fmt);
-    err->obj = qobject_to_qdict(qobject_from_jsonv(fmt, &ap));
+    err->msg = g_strdup_vprintf(fmt, ap);
     va_end(ap);
-    err->fmt = fmt;
+    err->err_class = err_class;
 
     *errp = err;
 }
@@ -50,9 +49,7 @@ Error *error_copy(const Error *err)
 
     err_new = g_malloc0(sizeof(*err));
     err_new->msg = g_strdup(err->msg);
-    err_new->fmt = err->fmt;
-    err_new->obj = err->obj;
-    QINCREF(err_new->obj);
+    err_new->err_class = err->err_class;
 
     return err_new;
 }
@@ -62,75 +59,24 @@ bool error_is_set(Error **errp)
     return (errp && *errp);
 }
 
-const char *error_get_pretty(Error *err)
-{
-    if (err->msg == NULL) {
-        QString *str;
-        str = qerror_format(err->fmt, err->obj);
-        err->msg = g_strdup(qstring_get_str(str));
-        QDECREF(str);
-    }
-
-    return err->msg;
-}
-
-const char *error_get_field(Error *err, const char *field)
-{
-    if (strcmp(field, "class") == 0) {
-        return qdict_get_str(err->obj, field);
-    } else {
-        QDict *dict = qdict_get_qdict(err->obj, "data");
-        return qdict_get_str(dict, field);
-    }
-}
-
-QDict *error_get_data(Error *err)
+ErrorClass error_get_class(const Error *err)
 {
-    QDict *data = qdict_get_qdict(err->obj, "data");
-    QINCREF(data);
-    return data;
+    return err->err_class;
 }
 
-void error_set_field(Error *err, const char *field, const char *value)
+const char *error_get_pretty(Error *err)
 {
-    QDict *dict = qdict_get_qdict(err->obj, "data");
-    qdict_put(dict, field, qstring_from_str(value));
+    return err->msg;
 }
 
 void error_free(Error *err)
 {
     if (err) {
-        QDECREF(err->obj);
         g_free(err->msg);
         g_free(err);
     }
 }
 
-bool error_is_type(Error *err, const char *fmt)
-{
-    const char *error_class;
-    char *ptr;
-    char *end;
-
-    if (!err) {
-        return false;
-    }
-
-    ptr = strstr(fmt, "'class': '");
-    assert(ptr != NULL);
-    ptr += strlen("'class': '");
-
-    end = strchr(ptr, '\'');
-    assert(end != NULL);
-
-    error_class = error_get_field(err, "class");
-    if (strlen(error_class) != end - ptr) {
-        return false;
-    }
-
-    return strncmp(ptr, error_class, end - ptr) == 0;
-}
-
 void error_propagate(Error **dst_err, Error *local_err)
 {
     if (dst_err && !*dst_err) {
@@ -139,22 +85,3 @@ void error_propagate(Error **dst_err, Error *local_err)
         error_free(local_err);
     }
 }
-
-QObject *error_get_qobject(Error *err)
-{
-    QINCREF(err->obj);
-    return QOBJECT(err->obj);
-}
-
-void error_set_qobject(Error **errp, QObject *obj)
-{
-    Error *err;
-    if (errp == NULL) {
-        return;
-    }
-    err = g_malloc0(sizeof(*err));
-    err->obj = qobject_to_qdict(obj);
-    qobject_incref(obj);
-
-    *errp = err;
-}
diff --git a/error.h b/error.h
index 3d9d96def0..96fc20328f 100644
--- a/error.h
+++ b/error.h
@@ -13,20 +13,21 @@
 #define ERROR_H
 
 #include "compiler.h"
+#include "qapi-types.h"
 #include <stdbool.h>
 
 /**
- * A class representing internal errors within QEMU.  An error has a string
- * typename and optionally a set of named string parameters.
+ * A class representing internal errors within QEMU.  An error has a ErrorClass
+ * code and a human message.
  */
 typedef struct Error Error;
 
 /**
- * Set an indirect pointer to an error given a printf-style format parameter.
- * Currently, qerror.h defines these error formats.  This function is not
- * meant to be used outside of QEMU.
+ * Set an indirect pointer to an error given a ErrorClass value and a
+ * printf-style human message.  This function is not meant to be used outside
+ * of QEMU.
  */
-void error_set(Error **err, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
+void error_set(Error **err, ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(3, 4);
 
 /**
  * Returns true if an indirect pointer to an error is pointing to a valid
@@ -34,6 +35,11 @@ void error_set(Error **err, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
  */
 bool error_is_set(Error **err);
 
+/*
+ * Get the error class of an error object.
+ */
+ErrorClass error_get_class(const Error *err);
+
 /**
  * Returns an exact copy of the error passed as an argument.
  */
@@ -45,16 +51,6 @@ Error *error_copy(const Error *err);
 const char *error_get_pretty(Error *err);
 
 /**
- * Get an individual named error field.
- */
-const char *error_get_field(Error *err, const char *field);
-
-/**
- * Get an individual named error field.
- */
-void error_set_field(Error *err, const char *field, const char *value);
-
-/**
  * Propagate an error to an indirect pointer to an error.  This function will
  * always transfer ownership of the error reference and handles the case where
  * dst_err is NULL correctly.  Errors after the first are discarded.
@@ -66,10 +62,4 @@ void error_propagate(Error **dst_err, Error *local_err);
  */
 void error_free(Error *err);
 
-/**
- * Determine if an error is of a speific type (based on the qerror format).
- * Non-QEMU users should get the `class' field to identify the error type.
- */
-bool error_is_type(Error *err, const char *fmt);
-
 #endif
diff --git a/error_int.h b/error_int.h
deleted file mode 100644
index 5e3942405a..0000000000
--- a/error_int.h
+++ /dev/null
@@ -1,29 +0,0 @@
-/*
- * QEMU Error Objects
- *
- * Copyright IBM, Corp. 2011
- *
- * Authors:
- *  Anthony Liguori   <aliguori@us.ibm.com>
- *
- * This work is licensed under the terms of the GNU LGPL, version 2.  See
- * the COPYING.LIB file in the top-level directory.
- */
-#ifndef QEMU_ERROR_INT_H
-#define QEMU_ERROR_INT_H
-
-#include "qemu-common.h"
-#include "qobject.h"
-#include "qdict.h"
-#include "error.h"
-
-/**
- * Internal QEMU functions for working with Error.
- *
- * These are used to convert QErrors to Errors
- */
-QDict *error_get_data(Error *err);
-QObject *error_get_qobject(Error *err);
-void error_set_qobject(Error **errp, QObject *obj);
-  
-#endif
diff --git a/hmp.c b/hmp.c
index c13386b114..a9d5675fc8 100644
--- a/hmp.c
+++ b/hmp.c
@@ -670,34 +670,35 @@ void hmp_pmemsave(Monitor *mon, const QDict *qdict)
 
 static void hmp_cont_cb(void *opaque, int err)
 {
-    Monitor *mon = opaque;
-
     if (!err) {
-        hmp_cont(mon, NULL);
+        qmp_cont(NULL);
     }
 }
 
+static bool key_is_missing(const BlockInfo *bdev)
+{
+    return (bdev->inserted && bdev->inserted->encryption_key_missing);
+}
+
 void hmp_cont(Monitor *mon, const QDict *qdict)
 {
+    BlockInfoList *bdev_list, *bdev;
     Error *errp = NULL;
 
-    qmp_cont(&errp);
-    if (error_is_set(&errp)) {
-        if (error_is_type(errp, QERR_DEVICE_ENCRYPTED)) {
-            const char *device;
-
-            /* The device is encrypted. Ask the user for the password
-               and retry */
-
-            device = error_get_field(errp, "device");
-            assert(device != NULL);
-
-            monitor_read_block_device_key(mon, device, hmp_cont_cb, mon);
-            error_free(errp);
-            return;
+    bdev_list = qmp_query_block(NULL);
+    for (bdev = bdev_list; bdev; bdev = bdev->next) {
+        if (key_is_missing(bdev->value)) {
+            monitor_read_block_device_key(mon, bdev->value->device,
+                                          hmp_cont_cb, NULL);
+            goto out;
         }
-        hmp_handle_error(mon, &errp);
     }
+
+    qmp_cont(&errp);
+    hmp_handle_error(mon, &errp);
+
+out:
+    qapi_free_BlockInfoList(bdev_list);
 }
 
 void hmp_system_wakeup(Monitor *mon, const QDict *qdict)
@@ -878,22 +879,6 @@ static void hmp_change_read_arg(Monitor *mon, const char *password,
     monitor_read_command(mon, 1);
 }
 
-static void cb_hmp_change_bdrv_pwd(Monitor *mon, const char *password,
-                                   void *opaque)
-{
-    Error *encryption_err = opaque;
-    Error *err = NULL;
-    const char *device;
-
-    device = error_get_field(encryption_err, "device");
-
-    qmp_block_passwd(device, password, &err);
-    hmp_handle_error(mon, &err);
-    error_free(encryption_err);
-
-    monitor_read_command(mon, 1);
-}
-
 void hmp_change(Monitor *mon, const QDict *qdict)
 {
     const char *device = qdict_get_str(qdict, "device");
@@ -911,18 +896,10 @@ void hmp_change(Monitor *mon, const QDict *qdict)
     }
 
     qmp_change(device, target, !!arg, arg, &err);
-    if (error_is_type(err, QERR_DEVICE_ENCRYPTED)) {
-        monitor_printf(mon, "%s (%s) is encrypted.\n",
-                       error_get_field(err, "device"),
-                       error_get_field(err, "filename"));
-        if (!monitor_get_rs(mon)) {
-            monitor_printf(mon,
-                    "terminal does not support password prompting\n");
-            error_free(err);
-            return;
-        }
-        readline_start(monitor_get_rs(mon), "Password: ", 1,
-                       cb_hmp_change_bdrv_pwd, err);
+    if (error_is_set(&err) &&
+        error_get_class(err) == ERROR_CLASS_DEVICE_ENCRYPTED) {
+        error_free(err);
+        monitor_read_block_device_key(mon, device, NULL, NULL);
         return;
     }
     hmp_handle_error(mon, &err);
diff --git a/hmp.h b/hmp.h
index 6d6e53bd6e..7dd93bf0f4 100644
--- a/hmp.h
+++ b/hmp.h
@@ -16,6 +16,7 @@
 
 #include "qemu-common.h"
 #include "qapi-types.h"
+#include "qdict.h"
 
 void hmp_info_name(Monitor *mon);
 void hmp_info_version(Monitor *mon);
diff --git a/hw/acpi.c b/hw/acpi.c
index effc7ec23e..f7950be267 100644
--- a/hw/acpi.c
+++ b/hw/acpi.c
@@ -22,6 +22,7 @@
 #include "hw.h"
 #include "pc.h"
 #include "acpi.h"
+#include "monitor.h"
 
 struct acpi_table_header {
     uint16_t _length;         /* our length, not actual part of the hdr */
@@ -386,6 +387,7 @@ void acpi_pm1_cnt_write(ACPIREGS *ar, uint16_t val, char s4)
             break;
         default:
             if (sus_typ == s4) { /* S4 request */
+                monitor_protocol_event(QEVENT_SUSPEND_DISK, NULL);
                 qemu_system_shutdown_request();
             }
             break;
diff --git a/migration-tcp.c b/migration-tcp.c
index 440804db75..ac891c38a3 100644
--- a/migration-tcp.c
+++ b/migration-tcp.c
@@ -82,27 +82,23 @@ static void tcp_wait_for_connect(void *opaque)
 int tcp_start_outgoing_migration(MigrationState *s, const char *host_port,
                                  Error **errp)
 {
+    bool in_progress;
+
     s->get_error = socket_errno;
     s->write = socket_write;
     s->close = tcp_close;
 
-    s->fd = inet_connect(host_port, false, errp);
+    s->fd = inet_connect(host_port, false, &in_progress, errp);
+    if (error_is_set(errp)) {
+        migrate_fd_error(s);
+        return -1;
+    }
 
-    if (!error_is_set(errp)) {
-        migrate_fd_connect(s);
-    } else if (error_is_type(*errp, QERR_SOCKET_CONNECT_IN_PROGRESS)) {
+    if (in_progress) {
         DPRINTF("connect in progress\n");
         qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
-    } else if (error_is_type(*errp, QERR_SOCKET_CREATE_FAILED)) {
-        DPRINTF("connect failed\n");
-        return -1;
-    } else if (error_is_type(*errp, QERR_SOCKET_CONNECT_FAILED)) {
-        DPRINTF("connect failed\n");
-        migrate_fd_error(s);
-        return -1;
     } else {
-        DPRINTF("unknown error\n");
-        return -1;
+        migrate_fd_connect(s);
     }
 
     return 0;
diff --git a/monitor.c b/monitor.c
index 5227cf15e3..dd63f1d640 100644
--- a/monitor.c
+++ b/monitor.c
@@ -172,41 +172,11 @@ struct Monitor {
     CPUArchState *mon_cpu;
     BlockDriverCompletionFunc *password_completion_cb;
     void *password_opaque;
-#ifdef CONFIG_DEBUG_MONITOR
-    int print_calls_nr;
-#endif
     QError *error;
     QLIST_HEAD(,mon_fd_t) fds;
     QLIST_ENTRY(Monitor) entry;
 };
 
-#ifdef CONFIG_DEBUG_MONITOR
-#define MON_DEBUG(fmt, ...) do {    \
-    fprintf(stderr, "Monitor: ");       \
-    fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
-
-static inline void mon_print_count_inc(Monitor *mon)
-{
-    mon->print_calls_nr++;
-}
-
-static inline void mon_print_count_init(Monitor *mon)
-{
-    mon->print_calls_nr = 0;
-}
-
-static inline int mon_print_count_get(const Monitor *mon)
-{
-    return mon->print_calls_nr;
-}
-
-#else /* !CONFIG_DEBUG_MONITOR */
-#define MON_DEBUG(fmt, ...) do { } while (0)
-static inline void mon_print_count_inc(Monitor *mon) { }
-static inline void mon_print_count_init(Monitor *mon) { }
-static inline int mon_print_count_get(const Monitor *mon) { return 0; }
-#endif /* CONFIG_DEBUG_MONITOR */
-
 /* QMP checker flags */
 #define QMP_ACCEPT_UNKNOWNS 1
 
@@ -299,8 +269,6 @@ void monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
     if (!mon)
         return;
 
-    mon_print_count_inc(mon);
-
     if (monitor_ctrl_mode(mon)) {
         return;
     }
@@ -385,16 +353,26 @@ static void monitor_json_emitter(Monitor *mon, const QObject *data)
     QDECREF(json);
 }
 
+static QDict *build_qmp_error_dict(const QError *err)
+{
+    QObject *obj;
+
+    obj = qobject_from_jsonf("{ 'error': { 'class': %s, 'desc': %p } }",
+                             ErrorClass_lookup[err->err_class],
+                             qerror_human(err));
+
+    return qobject_to_qdict(obj);
+}
+
 static void monitor_protocol_emitter(Monitor *mon, QObject *data)
 {
     QDict *qmp;
 
     trace_monitor_protocol_emitter(mon);
 
-    qmp = qdict_new();
-
     if (!monitor_has_error(mon)) {
         /* success response */
+        qmp = qdict_new();
         if (data) {
             qobject_incref(data);
             qdict_put_obj(qmp, "return", data);
@@ -404,9 +382,7 @@ static void monitor_protocol_emitter(Monitor *mon, QObject *data)
         }
     } else {
         /* error response */
-        qdict_put(mon->error->error, "desc", qerror_human(mon->error));
-        qdict_put(qmp, "error", mon->error->error);
-        QINCREF(mon->error->error);
+        qmp = build_qmp_error_dict(mon->error);
         QDECREF(mon->error);
         mon->error = NULL;
     }
@@ -456,6 +432,7 @@ static const char *monitor_event_names[] = {
     [QEVENT_BLOCK_JOB_CANCELLED] = "BLOCK_JOB_CANCELLED",
     [QEVENT_DEVICE_TRAY_MOVED] = "DEVICE_TRAY_MOVED",
     [QEVENT_SUSPEND] = "SUSPEND",
+    [QEVENT_SUSPEND_DISK] = "SUSPEND_DISK",
     [QEVENT_WAKEUP] = "WAKEUP",
     [QEVENT_BALLOON_CHANGE] = "BALLOON_CHANGE",
 };
@@ -3874,8 +3851,6 @@ void monitor_set_error(Monitor *mon, QError *qerror)
     if (!mon->error) {
         mon->error = qerror;
     } else {
-        MON_DEBUG("Additional error report at %s:%d\n",
-                  qerror->file, qerror->linenr);
         QDECREF(qerror);
     }
 }
@@ -3889,36 +3864,7 @@ static void handler_audit(Monitor *mon, const mon_cmd_t *cmd, int ret)
          * Action: Report an internal error to the client if in QMP.
          */
         qerror_report(QERR_UNDEFINED_ERROR);
-        MON_DEBUG("command '%s' returned failure but did not pass an error\n",
-                  cmd->name);
-    }
-
-#ifdef CONFIG_DEBUG_MONITOR
-    if (!ret && monitor_has_error(mon)) {
-        /*
-         * If it returns success, it must not have passed an error.
-         *
-         * Action: Report the passed error to the client.
-         */
-        MON_DEBUG("command '%s' returned success but passed an error\n",
-                  cmd->name);
     }
-
-    if (mon_print_count_get(mon) > 0 && strcmp(cmd->name, "info") != 0) {
-        /*
-         * Handlers should not call Monitor print functions.
-         *
-         * Action: Ignore them in QMP.
-         *
-         * (XXX: we don't check any 'info' or 'query' command here
-         * because the user print function _is_ called by do_info(), hence
-         * we will trigger this check. This problem will go away when we
-         * make 'query' commands real and kill do_info())
-         */
-        MON_DEBUG("command '%s' called print functions %d time(s)\n",
-                  cmd->name, mon_print_count_get(mon));
-    }
-#endif
 }
 
 static void handle_user_command(Monitor *mon, const char *cmdline)
@@ -4447,8 +4393,6 @@ static void qmp_call_cmd(Monitor *mon, const mon_cmd_t *cmd,
     int ret;
     QObject *data = NULL;
 
-    mon_print_count_init(mon);
-
     ret = cmd->mhandler.cmd_new(mon, params, &data);
     handler_audit(mon, cmd, ret);
     monitor_protocol_emitter(mon, data);
diff --git a/monitor.h b/monitor.h
index 5f4de1b3da..4ef9a046f8 100644
--- a/monitor.h
+++ b/monitor.h
@@ -40,6 +40,7 @@ typedef enum MonitorEvent {
     QEVENT_BLOCK_JOB_CANCELLED,
     QEVENT_DEVICE_TRAY_MOVED,
     QEVENT_SUSPEND,
+    QEVENT_SUSPEND_DISK,
     QEVENT_WAKEUP,
     QEVENT_BALLOON_CHANGE,
 
diff --git a/nbd.c b/nbd.c
index dc0adf90ed..0dd60c5f4c 100644
--- a/nbd.c
+++ b/nbd.c
@@ -162,7 +162,7 @@ int tcp_socket_outgoing(const char *address, uint16_t port)
 
 int tcp_socket_outgoing_spec(const char *address_and_port)
 {
-    return inet_connect(address_and_port, true, NULL);
+    return inet_connect(address_and_port, true, NULL, NULL);
 }
 
 int tcp_socket_incoming(const char *address, uint16_t port)
diff --git a/qapi-schema.json b/qapi-schema.json
index 56d9d7b0e2..53bbe46e4d 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -3,6 +3,36 @@
 # QAPI Schema
 
 ##
+# @ErrorClass
+#
+# QEMU error classes
+#
+# @GenericError: this is used for errors that don't require a specific error
+#                class. This should be the default case for most errors
+#
+# @CommandNotFound: the requested command has not been found
+#
+# @DeviceEncrypted: the requested operation can't be fulfilled because the
+#                   selected device is encrypted
+#
+# @DeviceNotActive: a device has failed to be become active
+#
+# @DeviceNotFound: the requested device has not been found
+#
+# @KVMMissingCap: the requested operation can't be fulfilled because a
+#                 required KVM capability is missing
+#
+# @MigrationExpected: the requested operation can't be fulfilled because a
+#                     migration process is expected
+#
+# Since: 1.2
+##
+{ 'enum': 'ErrorClass',
+  'data': [ 'GenericError', 'CommandNotFound', 'DeviceEncrypted',
+            'DeviceNotActive', 'DeviceNotFound', 'KVMMissingCap',
+            'MigrationExpected' ] }
+
+##
 # @NameInfo:
 #
 # Guest name information.
@@ -486,6 +516,9 @@
 #
 # @encrypted: true if the backing device is encrypted
 #
+# @encryption_key_missing: true if the backing device is encrypted but an
+#                          valid encryption key is missing
+#
 # @bps: total throughput limit in bytes per second is specified
 #
 # @bps_rd: read throughput limit in bytes per second is specified
@@ -505,9 +538,9 @@
 { 'type': 'BlockDeviceInfo',
   'data': { 'file': 'str', 'ro': 'bool', 'drv': 'str',
             '*backing_file': 'str', 'backing_file_depth': 'int',
-            'encrypted': 'bool', 'bps': 'int', 'bps_rd': 'int',
-            'bps_wr': 'int', 'iops': 'int', 'iops_rd': 'int',
-            'iops_wr': 'int'} }
+            'encrypted': 'bool', 'encryption_key_missing': 'bool',
+            'bps': 'int', 'bps_rd': 'int', 'bps_wr': 'int',
+            'iops': 'int', 'iops_rd': 'int', 'iops_wr': 'int'} }
 
 ##
 # @BlockDeviceIoStatus:
@@ -709,7 +742,6 @@
 # Returns information about the current VNC server
 #
 # Returns: @VncInfo
-#          If VNC support is not compiled in, FeatureDisabled
 #
 # Since: 0.14.0
 ##
@@ -1093,9 +1125,6 @@
 #                       virtual address (defaults to CPU 0)
 #
 # Returns: Nothing on success
-#          If @cpu is not a valid VCPU, InvalidParameterValue
-#          If @filename cannot be opened, OpenFileFailed
-#          If an I/O error occurs while writing the file, IOError
 #
 # Since: 0.14.0
 #
@@ -1116,8 +1145,6 @@
 # @filename: the file to save the memory to as binary data
 #
 # Returns: Nothing on success
-#          If @filename cannot be opened, OpenFileFailed
-#          If an I/O error occurs while writing the file, IOError
 #
 # Since: 0.14.0
 #
@@ -1159,7 +1186,6 @@
 # Injects an Non-Maskable Interrupt into all guest's VCPUs.
 #
 # Returns:  If successful, nothing
-#           If the Virtual Machine doesn't support NMI injection, Unsupported
 #
 # Since:  0.14.0
 #
@@ -1210,7 +1236,6 @@
 # Returns: nothing on success
 #          If @device is not a valid block device, DeviceNotFound
 #          If @device is not encrypted, DeviceNotEncrypted
-#          If @password is not valid for this device, InvalidPassword
 #
 # Notes:  Not all block formats support encryption and some that do are not
 #         able to validate that a password is correct.  Disk corruption may
@@ -1251,11 +1276,6 @@
 #
 # Returns: nothing on success
 #          If @device is not a valid block device, DeviceNotFound
-#          If @size is negative, InvalidParameterValue
-#          If the block device has no medium inserted, DeviceHasNoMedium
-#          If the block device does not support resize, Unsupported
-#          If the block device is read-only, DeviceIsReadOnly
-#          If a long-running operation is using the device, DeviceInUse
 #
 # Since: 0.14.0
 ##
@@ -1317,10 +1337,6 @@
 #
 # Returns: nothing on success
 #          If @device is not a valid block device, DeviceNotFound
-#          If @device is busy, DeviceInUse will be returned
-#          If @snapshot-file can't be created, OpenFileFailed
-#          If @snapshot-file can't be opened, OpenFileFailed
-#          If @format is invalid, InvalidBlockFormat
 #
 # Note: The transaction aborts on the first failure.  Therefore, there will
 # be only one device or snapshot file returned in an error condition, and
@@ -1349,8 +1365,6 @@
 #
 # Returns: nothing on success
 #          If @device is not a valid block device, DeviceNotFound
-#          If @snapshot-file can't be opened, OpenFileFailed
-#          If @format is invalid, InvalidBlockFormat
 #
 # Since 0.14.0
 ##
@@ -1474,9 +1488,7 @@
 #        4) A link type in the form 'link<subtype>' where subtype is a qdev
 #           device type name.  Link properties form the device model graph.
 #
-# Since: 1.1
-#
-# Notes: This type is experimental.  Its syntax may change in future releases.
+# Since: 1.2
 ##
 { 'type': 'ObjectPropertyInfo',
   'data': { 'name': 'str', 'type': 'str' } }
@@ -1493,10 +1505,7 @@
 # Returns: a list of @ObjectPropertyInfo that describe the properties of the
 #          object.
 #
-# Since: 1.1
-#
-# Notes: This command is experimental.  It's syntax may change in future
-#        releases.
+# Since: 1.2
 ##
 { 'command': 'qom-list',
   'data': { 'path': 'str' },
@@ -1532,9 +1541,7 @@
 #          returns as #str pathnames.  All integer property types (u8, u16, etc)
 #          are returned as #int.
 #
-# Since: 1.1
-#
-# Notes: This command is experimental and may change syntax in future releases.
+# Since: 1.2
 ##
 { 'command': 'qom-get',
   'data': { 'path': 'str', 'property': 'str' },
@@ -1553,9 +1560,7 @@
 # @value: a value who's type is appropriate for the property type.  See @qom-get
 #         for a description of type mapping.
 #
-# Since: 1.1
-#
-# Notes: This command is experimental and may change syntax in future releases.
+# Since: 1.2
 ##
 { 'command': 'qom-set',
   'data': { 'path': 'str', 'property': 'str', 'value': 'visitor' },
@@ -1579,11 +1584,6 @@
 #
 # Returns: Nothing on success
 #          If Spice is not enabled, DeviceNotFound
-#          If @protocol does not support connected, InvalidParameter
-#          If @protocol is invalid, InvalidParameter
-#          If any other error occurs, SetPasswdFailed
-#
-# Notes: If VNC is not enabled, SetPasswdFailed is returned.
 #
 # Since: 0.14.0
 ##
@@ -1605,8 +1605,6 @@
 #
 # Returns: Nothing on success
 #          If @protocol is `spice' and Spice is not active, DeviceNotFound
-#          If an error occurs setting password expiration, SetPasswdFailed
-#          If @protocol is not `spice' or 'vnc', InvalidParameter
 #
 # Since: 0.14.0
 #
@@ -1629,8 +1627,6 @@
 #
 # Returns:  Nothing on success
 #           If @device is not a valid block device, DeviceNotFound
-#           If @device is not removable and @force is false, DeviceNotRemovable
-#           If @force is false and @device is locked, DeviceLocked
 #
 # Notes:    Ejecting a device will no media results in success
 #
@@ -1673,7 +1669,6 @@
 #
 # Returns: Nothing on success.
 #          If @device is not a valid block device, DeviceNotFound
-#          If @format is not a valid block format, InvalidBlockFormat
 #          If the new block device is encrypted, DeviceEncrypted.  Note that
 #          if this error is returned, the device has been opened successfully
 #          and an additional call to @block_passwd is required to set the
@@ -1709,7 +1704,6 @@
 #
 # Returns: Nothing on success
 #          If @device is not a valid block device, DeviceNotFound
-#          If the argument combination is invalid, InvalidParameterCombination
 #
 # Since: 1.1
 ##
@@ -1743,11 +1737,7 @@
 # @speed:  #optional the maximum speed, in bytes per second
 #
 # Returns: Nothing on success
-#          If streaming is already active on this device, DeviceInUse
 #          If @device does not exist, DeviceNotFound
-#          If image streaming is not supported by this device, NotSupported
-#          If @base does not exist, BaseNotFound
-#          If @speed is invalid, InvalidParameter
 #
 # Since: 1.1
 ##
@@ -1769,8 +1759,6 @@
 #          Defaults to 0.
 #
 # Returns: Nothing on success
-#          If the job type does not support throttling, NotSupported
-#          If the speed value is invalid, InvalidParameter
 #          If no background operation is active on this device, DeviceNotActive
 #
 # Since: 1.1
@@ -1800,7 +1788,6 @@
 #
 # Returns: Nothing on success
 #          If no background operation is active on this device, DeviceNotActive
-#          If cancellation already in progress, DeviceInUse
 #
 # Since: 1.1
 ##
@@ -1832,14 +1819,40 @@
 # Returns: a list of @ObjectTypeInfo or an empty list if no results are found
 #
 # Since: 1.1
-#
-# Notes: This command is experimental and may change syntax in future releases.
 ##
 { 'command': 'qom-list-types',
   'data': { '*implements': 'str', '*abstract': 'bool' },
   'returns': [ 'ObjectTypeInfo' ] }
 
 ##
+# @DevicePropertyInfo:
+#
+# Information about device properties.
+#
+# @name: the name of the property
+# @type: the typename of the property
+#
+# Since: 1.2
+##
+{ 'type': 'DevicePropertyInfo',
+  'data': { 'name': 'str', 'type': 'str' } }
+
+##
+# @device-list-properties:
+#
+# List properties associated with a device.
+#
+# @typename: the type name of a device
+#
+# Returns: a list of DevicePropertyInfo describing a devices properties
+#
+# Since: 1.2
+##
+{ 'command': 'device-list-properties',
+  'data': { 'typename': 'str'},
+  'returns': [ 'DevicePropertyInfo' ] }
+
+##
 # @migrate
 #
 # Migrates the current running guest to another Virtual Machine.
@@ -1870,8 +1883,6 @@
 # format.
 #
 # Returns: Nothing on success
-#          If @filename cannot be opened, OpenFileFailed
-#          If an I/O error occurs while writing the file, IOError
 #
 # Since: 1.1
 ##
@@ -1886,7 +1897,6 @@
 #
 # Returns: Nothing on success
 #          If @id is not a valid device, DeviceNotFound
-#          If the device does not support unplug, BusNoHotplug
 #
 # Notes: When this command completes, the device may not be removed from the
 #        guest.  Hot removal is an operation that requires guest cooperation.
@@ -1927,14 +1937,6 @@
 # want to dump all guest's memory, please specify the start @begin and @length
 #
 # Returns: nothing on success
-#          If @begin contains an invalid address, InvalidParameter
-#          If only one of @begin and @length is specified, MissingParameter
-#          If @protocol stats with "fd:", and the fd cannot be found, FdNotFound
-#          If @protocol starts with "file:", and the file cannot be
-#             opened, OpenFileFailed
-#          If @protocol does not start with "fd:" or "file:", InvalidParameter
-#          If an I/O error occurs while writing the file, IOError
-#          If the target does not support this command, Unsupported
 #
 # Since: 1.2
 ##
@@ -1961,10 +1963,6 @@
 #
 # Returns: Nothing on success
 #          If @type is not a valid network backend, DeviceNotFound
-#          If @id is not a valid identifier, InvalidParameterValue
-#          if @id already exists, DuplicateId
-#          If @props contains an invalid parameter for this backend,
-#            InvalidParameter
 ##
 { 'command': 'netdev_add',
   'data': {'type': 'str', 'id': 'str', '*props': '**'},
@@ -2284,8 +2282,6 @@
 # @fdname: file descriptor name
 #
 # Returns: Nothing on success
-#          If file descriptor was not received, FdNotSupplied
-#          If @fdname is not valid, InvalidParameterType
 #
 # Since: 0.14.0
 #
@@ -2305,8 +2301,58 @@
 # @fdname: file descriptor name
 #
 # Returns: Nothing on success
-#          If @fdname is not found, FdNotFound
 #
 # Since: 0.14.0
 ##
 { 'command': 'closefd', 'data': {'fdname': 'str'} }
+
+##
+# @MachineInfo:
+#
+# Information describing a machine.
+#
+# @name: the name of the machine
+#
+# @alias: #optional an alias for the machine name
+#
+# @default: #optional whether the machine is default
+#
+# Since: 1.2.0
+##
+{ 'type': 'MachineInfo',
+  'data': { 'name': 'str', '*alias': 'str',
+            '*is-default': 'bool' } }
+
+##
+# @query-machines:
+#
+# Return a list of supported machines
+#
+# Returns: a list of MachineInfo
+#
+# Since: 1.2.0
+##
+{ 'command': 'query-machines', 'returns': ['MachineInfo'] }
+
+##
+# @CpuDefinitionInfo:
+#
+# Virtual CPU definition.
+#
+# @name: the name of the CPU definition
+#
+# Since: 1.2.0
+##
+{ 'type': 'CpuDefinitionInfo',
+  'data': { 'name': 'str' } }
+
+##
+# @query-cpu-definitions:
+#
+# Return a list of supported virtual CPU definitions
+#
+# Returns: a list of CpuDefInfo
+#
+# Since: 1.2.0
+##
+{ 'command': 'query-cpu-definitions', 'returns': ['CpuDefinitionInfo'] }
diff --git a/qapi/qmp-core.h b/qapi/qmp-core.h
index b0f64ba1ee..00446cff9b 100644
--- a/qapi/qmp-core.h
+++ b/qapi/qmp-core.h
@@ -49,6 +49,7 @@ void qmp_disable_command(const char *name);
 void qmp_enable_command(const char *name);
 bool qmp_command_is_enabled(const char *name);
 char **qmp_get_command_list(void);
+QObject *qmp_build_error_object(Error *errp);
 
 #endif
 
diff --git a/qapi/qmp-dispatch.c b/qapi/qmp-dispatch.c
index 122c1a29ba..4085994686 100644
--- a/qapi/qmp-dispatch.c
+++ b/qapi/qmp-dispatch.c
@@ -14,8 +14,8 @@
 #include "qemu-objects.h"
 #include "qapi/qmp-core.h"
 #include "json-parser.h"
+#include "qapi-types.h"
 #include "error.h"
-#include "error_int.h"
 #include "qerror.h"
 
 static QDict *qmp_dispatch_check_obj(const QObject *request, Error **errp)
@@ -109,6 +109,13 @@ static QObject *do_qmp_dispatch(QObject *request, Error **errp)
     return ret;
 }
 
+QObject *qmp_build_error_object(Error *errp)
+{
+    return qobject_from_jsonf("{ 'class': %s, 'desc': %s }",
+                              ErrorClass_lookup[error_get_class(errp)],
+                              error_get_pretty(errp));
+}
+
 QObject *qmp_dispatch(QObject *request)
 {
     Error *err = NULL;
@@ -119,7 +126,7 @@ QObject *qmp_dispatch(QObject *request)
 
     rsp = qdict_new();
     if (err) {
-        qdict_put_obj(rsp, "error", error_get_qobject(err));
+        qdict_put_obj(rsp, "error", qmp_build_error_object(err));
         error_free(err);
     } else if (ret) {
         qdict_put_obj(rsp, "return", ret);
diff --git a/qemu-char.c b/qemu-char.c
index c2aaaeeb8f..382c71ebcd 100644
--- a/qemu-char.c
+++ b/qemu-char.c
@@ -2446,7 +2446,7 @@ static CharDriverState *qemu_chr_open_socket(QemuOpts *opts)
         if (is_listen) {
             fd = inet_listen_opts(opts, 0, NULL);
         } else {
-            fd = inet_connect_opts(opts, NULL);
+            fd = inet_connect_opts(opts, NULL, NULL);
         }
     }
     if (fd < 0) {
diff --git a/qemu-ga.c b/qemu-ga.c
index f1a39ec3a6..8f87621ae4 100644
--- a/qemu-ga.c
+++ b/qemu-ga.c
@@ -28,7 +28,6 @@
 #include "module.h"
 #include "signal.h"
 #include "qerror.h"
-#include "error_int.h"
 #include "qapi/qmp-core.h"
 #include "qga/channel.h"
 #ifdef _WIN32
@@ -515,7 +514,7 @@ static void process_event(JSONMessageParser *parser, QList *tokens)
         } else {
             g_warning("failed to parse event: %s", error_get_pretty(err));
         }
-        qdict_put_obj(qdict, "error", error_get_qobject(err));
+        qdict_put_obj(qdict, "error", qmp_build_error_object(err));
         error_free(err);
     } else {
         qdict = qobject_to_qdict(obj);
@@ -532,7 +531,7 @@ static void process_event(JSONMessageParser *parser, QList *tokens)
             qdict = qdict_new();
             g_warning("unrecognized payload format");
             error_set(&err, QERR_UNSUPPORTED);
-            qdict_put_obj(qdict, "error", error_get_qobject(err));
+            qdict_put_obj(qdict, "error", qmp_build_error_object(err));
             error_free(err);
         }
         ret = send_response(s, QOBJECT(qdict));
diff --git a/qemu-sockets.c b/qemu-sockets.c
index beb2bb6f4a..361d890da3 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -209,7 +209,7 @@ listen:
     return slisten;
 }
 
-int inet_connect_opts(QemuOpts *opts, Error **errp)
+int inet_connect_opts(QemuOpts *opts, bool *in_progress, Error **errp)
 {
     struct addrinfo ai,*res,*e;
     const char *addr;
@@ -224,6 +224,10 @@ int inet_connect_opts(QemuOpts *opts, Error **errp)
     ai.ai_family = PF_UNSPEC;
     ai.ai_socktype = SOCK_STREAM;
 
+    if (in_progress) {
+        *in_progress = false;
+    }
+
     addr = qemu_opt_get(opts, "host");
     port = qemu_opt_get(opts, "port");
     block = qemu_opt_get_bool(opts, "block", 0);
@@ -277,7 +281,9 @@ int inet_connect_opts(QemuOpts *opts, Error **errp)
   #else
         if (!block && (rc == -EINPROGRESS)) {
   #endif
-            error_set(errp, QERR_SOCKET_CONNECT_IN_PROGRESS);
+            if (in_progress) {
+                *in_progress = true;
+            }
         } else if (rc < 0) {
             if (NULL == e->ai_next)
                 fprintf(stderr, "%s: connect(%s,%s,%s,%s): %s\n", __FUNCTION__,
@@ -487,7 +493,7 @@ int inet_listen(const char *str, char *ostr, int olen,
     return sock;
 }
 
-int inet_connect(const char *str, bool block, Error **errp)
+int inet_connect(const char *str, bool block, bool *in_progress, Error **errp)
 {
     QemuOpts *opts;
     int sock = -1;
@@ -497,7 +503,7 @@ int inet_connect(const char *str, bool block, Error **errp)
         if (block) {
             qemu_opt_set(opts, "block", "on");
         }
-        sock = inet_connect_opts(opts, errp);
+        sock = inet_connect_opts(opts, in_progress, errp);
     } else {
         error_set(errp, QERR_SOCKET_CREATE_FAILED);
     }
diff --git a/qemu_socket.h b/qemu_socket.h
index 4689ff340d..30ae6af8b8 100644
--- a/qemu_socket.h
+++ b/qemu_socket.h
@@ -42,8 +42,8 @@ int send_all(int fd, const void *buf, int len1);
 int inet_listen_opts(QemuOpts *opts, int port_offset, Error **errp);
 int inet_listen(const char *str, char *ostr, int olen,
                 int socktype, int port_offset, Error **errp);
-int inet_connect_opts(QemuOpts *opts, Error **errp);
-int inet_connect(const char *str, bool block, Error **errp);
+int inet_connect_opts(QemuOpts *opts, bool *in_progress, Error **errp);
+int inet_connect(const char *str, bool block, bool *in_progress, Error **errp);
 int inet_dgram_opts(QemuOpts *opts);
 const char *inet_strfamily(int family);
 
diff --git a/qerror.c b/qerror.c
index 92c4eff179..08185047b4 100644
--- a/qerror.c
+++ b/qerror.c
@@ -23,320 +23,11 @@ static const QType qerror_type = {
 };
 
 /**
- * The 'desc' parameter is a printf-like string, the format of the format
- * string is:
- *
- * %(KEY)
- *
- * Where KEY is a QDict key, which has to be passed to qerror_from_info().
- *
- * Example:
- *
- * "foo error on device: %(device) slot: %(slot_nr)"
- *
- * A single percent sign can be printed if followed by a second one,
- * for example:
- *
- * "running out of foo: %(foo)%%"
- *
- * Please keep the entries in alphabetical order.
- * Use scripts/check-qerror.sh to check.
- */
-static const QErrorStringTable qerror_table[] = {
-    {
-        .error_fmt = QERR_ADD_CLIENT_FAILED,
-        .desc      = "Could not add client",
-    },
-    {
-        .error_fmt = QERR_AMBIGUOUS_PATH,
-        .desc      = "Path '%(path)' does not uniquely identify a %(object)"
-    },
-    {
-        .error_fmt = QERR_BAD_BUS_FOR_DEVICE,
-        .desc      = "Device '%(device)' can't go on a %(bad_bus_type) bus",
-    },
-    {
-        .error_fmt = QERR_BASE_NOT_FOUND,
-        .desc      = "Base '%(base)' not found",
-    },
-    {
-        .error_fmt = QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED,
-        .desc      = "Block format '%(format)' used by device '%(name)' does not support feature '%(feature)'",
-    },
-    {
-        .error_fmt = QERR_BUS_NO_HOTPLUG,
-        .desc      = "Bus '%(bus)' does not support hotplugging",
-    },
-    {
-        .error_fmt = QERR_BUS_NOT_FOUND,
-        .desc      = "Bus '%(bus)' not found",
-    },
-    {
-        .error_fmt = QERR_COMMAND_DISABLED,
-        .desc      = "The command %(name) has been disabled for this instance",
-    },
-    {
-        .error_fmt = QERR_COMMAND_NOT_FOUND,
-        .desc      = "The command %(name) has not been found",
-    },
-    {
-        .error_fmt = QERR_DEVICE_ENCRYPTED,
-        .desc      = "Device '%(device)' is encrypted",
-    },
-    {
-        .error_fmt = QERR_DEVICE_FEATURE_BLOCKS_MIGRATION,
-        .desc      = "Migration is disabled when using feature '%(feature)' in device '%(device)'",
-    },
-    {
-        .error_fmt = QERR_DEVICE_HAS_NO_MEDIUM,
-        .desc      = "Device '%(device)' has no medium",
-    },
-    {
-        .error_fmt = QERR_DEVICE_INIT_FAILED,
-        .desc      = "Device '%(device)' could not be initialized",
-    },
-    {
-        .error_fmt = QERR_DEVICE_IN_USE,
-        .desc      = "Device '%(device)' is in use",
-    },
-    {
-        .error_fmt = QERR_DEVICE_IS_READ_ONLY,
-        .desc      = "Device '%(device)' is read only",
-    },
-    {
-        .error_fmt = QERR_DEVICE_LOCKED,
-        .desc      = "Device '%(device)' is locked",
-    },
-    {
-        .error_fmt = QERR_DEVICE_MULTIPLE_BUSSES,
-        .desc      = "Device '%(device)' has multiple child busses",
-    },
-    {
-        .error_fmt = QERR_DEVICE_NO_BUS,
-        .desc      = "Device '%(device)' has no child bus",
-    },
-    {
-        .error_fmt = QERR_DEVICE_NO_HOTPLUG,
-        .desc      = "Device '%(device)' does not support hotplugging",
-    },
-    {
-        .error_fmt = QERR_DEVICE_NOT_ACTIVE,
-        .desc      = "Device '%(device)' has not been activated",
-    },
-    {
-        .error_fmt = QERR_DEVICE_NOT_ENCRYPTED,
-        .desc      = "Device '%(device)' is not encrypted",
-    },
-    {
-        .error_fmt = QERR_DEVICE_NOT_FOUND,
-        .desc      = "Device '%(device)' not found",
-    },
-    {
-        .error_fmt = QERR_DEVICE_NOT_REMOVABLE,
-        .desc      = "Device '%(device)' is not removable",
-    },
-    {
-        .error_fmt = QERR_DUPLICATE_ID,
-        .desc      = "Duplicate ID '%(id)' for %(object)",
-    },
-    {
-        .error_fmt = QERR_FD_NOT_FOUND,
-        .desc      = "File descriptor named '%(name)' not found",
-    },
-    {
-        .error_fmt = QERR_FD_NOT_SUPPLIED,
-        .desc      = "No file descriptor supplied via SCM_RIGHTS",
-    },
-    {
-        .error_fmt = QERR_FEATURE_DISABLED,
-        .desc      = "The feature '%(name)' is not enabled",
-    },
-    {
-        .error_fmt = QERR_INVALID_BLOCK_FORMAT,
-        .desc      = "Invalid block format '%(name)'",
-    },
-    {
-        .error_fmt = QERR_INVALID_OPTION_GROUP,
-        .desc      = "There is no option group '%(group)'",
-    },
-    {
-        .error_fmt = QERR_INVALID_PARAMETER,
-        .desc      = "Invalid parameter '%(name)'",
-    },
-    {
-        .error_fmt = QERR_INVALID_PARAMETER_COMBINATION,
-        .desc      = "Invalid parameter combination",
-    },
-    {
-        .error_fmt = QERR_INVALID_PARAMETER_TYPE,
-        .desc      = "Invalid parameter type for '%(name)', expected: %(expected)",
-    },
-    {
-        .error_fmt = QERR_INVALID_PARAMETER_VALUE,
-        .desc      = "Parameter '%(name)' expects %(expected)",
-    },
-    {
-        .error_fmt = QERR_INVALID_PASSWORD,
-        .desc      = "Password incorrect",
-    },
-    {
-        .error_fmt = QERR_IO_ERROR,
-        .desc      = "An IO error has occurred",
-    },
-    {
-        .error_fmt = QERR_JSON_PARSE_ERROR,
-        .desc      = "JSON parse error, %(message)",
-
-    },
-    {
-        .error_fmt = QERR_JSON_PARSING,
-        .desc      = "Invalid JSON syntax",
-    },
-    {
-        .error_fmt = QERR_KVM_MISSING_CAP,
-        .desc      = "Using KVM without %(capability), %(feature) unavailable",
-    },
-    {
-        .error_fmt = QERR_MIGRATION_ACTIVE,
-        .desc      = "There's a migration process in progress",
-    },
-    {
-        .error_fmt = QERR_MIGRATION_NOT_SUPPORTED,
-        .desc      = "State blocked by non-migratable device '%(device)'",
-    },
-    {
-        .error_fmt = QERR_MIGRATION_EXPECTED,
-        .desc      = "An incoming migration is expected before this command can be executed",
-    },
-    {
-        .error_fmt = QERR_MISSING_PARAMETER,
-        .desc      = "Parameter '%(name)' is missing",
-    },
-    {
-        .error_fmt = QERR_NO_BUS_FOR_DEVICE,
-        .desc      = "No '%(bus)' bus found for device '%(device)'",
-    },
-    {
-        .error_fmt = QERR_NOT_SUPPORTED,
-        .desc      = "Not supported",
-    },
-    {
-        .error_fmt = QERR_OPEN_FILE_FAILED,
-        .desc      = "Could not open '%(filename)'",
-    },
-    {
-        .error_fmt = QERR_PERMISSION_DENIED,
-        .desc      = "Insufficient permission to perform this operation",
-    },
-    {
-        .error_fmt = QERR_PROPERTY_NOT_FOUND,
-        .desc      = "Property '%(device).%(property)' not found",
-    },
-    {
-        .error_fmt = QERR_PROPERTY_VALUE_BAD,
-        .desc      = "Property '%(device).%(property)' doesn't take value '%(value)'",
-    },
-    {
-        .error_fmt = QERR_PROPERTY_VALUE_IN_USE,
-        .desc      = "Property '%(device).%(property)' can't take value '%(value)', it's in use",
-    },
-    {
-        .error_fmt = QERR_PROPERTY_VALUE_NOT_FOUND,
-        .desc      = "Property '%(device).%(property)' can't find value '%(value)'",
-    },
-    {
-        .error_fmt = QERR_PROPERTY_VALUE_NOT_POWER_OF_2,
-        .desc      = "Property '%(device).%(property)' doesn't take "
-                     "value '%(value)', it's not a power of 2",
-    },
-    {
-        .error_fmt = QERR_PROPERTY_VALUE_OUT_OF_RANGE,
-        .desc      = "Property '%(device).%(property)' doesn't take "
-                     "value %(value) (minimum: %(min), maximum: %(max))",
-    },
-    {
-        .error_fmt = QERR_QGA_COMMAND_FAILED,
-        .desc      = "Guest agent command failed, error was '%(message)'",
-    },
-    {
-        .error_fmt = QERR_QGA_LOGGING_FAILED,
-        .desc      = "Guest agent failed to log non-optional log statement",
-    },
-    {
-        .error_fmt = QERR_QMP_BAD_INPUT_OBJECT,
-        .desc      = "Expected '%(expected)' in QMP input",
-    },
-    {
-        .error_fmt = QERR_QMP_BAD_INPUT_OBJECT_MEMBER,
-        .desc      = "QMP input object member '%(member)' expects '%(expected)'",
-    },
-    {
-        .error_fmt = QERR_QMP_EXTRA_MEMBER,
-        .desc      = "QMP input object member '%(member)' is unexpected",
-    },
-    {
-        .error_fmt = QERR_RESET_REQUIRED,
-        .desc      = "Resetting the Virtual Machine is required",
-    },
-    {
-        .error_fmt = QERR_SET_PASSWD_FAILED,
-        .desc      = "Could not set password",
-    },
-    {
-        .error_fmt = QERR_TOO_MANY_FILES,
-        .desc      = "Too many open files",
-    },
-    {
-        .error_fmt = QERR_UNDEFINED_ERROR,
-        .desc      = "An undefined error has occurred",
-    },
-    {
-        .error_fmt = QERR_UNKNOWN_BLOCK_FORMAT_FEATURE,
-        .desc      = "'%(device)' uses a %(format) feature which is not "
-                     "supported by this qemu version: %(feature)",
-    },
-    {
-        .error_fmt = QERR_UNSUPPORTED,
-        .desc      = "this feature or command is not currently supported",
-    },
-    {
-        .error_fmt = QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION,
-        .desc      = "Migration is disabled when VirtFS export path '%(path)' "
-                     "is mounted in the guest using mount_tag '%(tag)'",
-    },
-    {
-        .error_fmt = QERR_VNC_SERVER_FAILED,
-        .desc      = "Could not start VNC server on %(target)",
-    },
-    {
-        .error_fmt = QERR_SOCKET_CONNECT_IN_PROGRESS,
-        .desc      = "Connection can not be completed immediately",
-    },
-    {
-        .error_fmt = QERR_SOCKET_CONNECT_FAILED,
-        .desc      = "Failed to connect to socket",
-    },
-    {
-        .error_fmt = QERR_SOCKET_LISTEN_FAILED,
-        .desc      = "Failed to set socket to listening mode",
-    },
-    {
-        .error_fmt = QERR_SOCKET_BIND_FAILED,
-        .desc      = "Failed to bind socket",
-    },
-    {
-        .error_fmt = QERR_SOCKET_CREATE_FAILED,
-        .desc      = "Failed to create socket",
-    },
-    {}
-};
-
-/**
  * qerror_new(): Create a new QError
  *
  * Return strong reference.
  */
-QError *qerror_new(void)
+static QError *qerror_new(void)
 {
     QError *qerr;
 
@@ -346,200 +37,31 @@ QError *qerror_new(void)
     return qerr;
 }
 
-static void GCC_FMT_ATTR(2, 3) qerror_abort(const QError *qerr,
-                                            const char *fmt, ...)
-{
-    va_list ap;
-
-    fprintf(stderr, "qerror: bad call in function '%s':\n", qerr->func);
-    fprintf(stderr, "qerror: -> ");
-
-    va_start(ap, fmt);
-    vfprintf(stderr, fmt, ap);
-    va_end(ap);
-
-    fprintf(stderr, "\nqerror: call at %s:%d\n", qerr->file, qerr->linenr);
-    abort();
-}
-
-static void GCC_FMT_ATTR(2, 0) qerror_set_data(QError *qerr,
-                                               const char *fmt, va_list *va)
-{
-    QObject *obj;
-
-    obj = qobject_from_jsonv(fmt, va);
-    if (!obj) {
-        qerror_abort(qerr, "invalid format '%s'", fmt);
-    }
-    if (qobject_type(obj) != QTYPE_QDICT) {
-        qerror_abort(qerr, "error format is not a QDict '%s'", fmt);
-    }
-
-    qerr->error = qobject_to_qdict(obj);
-
-    obj = qdict_get(qerr->error, "class");
-    if (!obj) {
-        qerror_abort(qerr, "missing 'class' key in '%s'", fmt);
-    }
-    if (qobject_type(obj) != QTYPE_QSTRING) {
-        qerror_abort(qerr, "'class' key value should be a QString");
-    }
-    
-    obj = qdict_get(qerr->error, "data");
-    if (!obj) {
-        qerror_abort(qerr, "missing 'data' key in '%s'", fmt);
-    }
-    if (qobject_type(obj) != QTYPE_QDICT) {
-        qerror_abort(qerr, "'data' key value should be a QDICT");
-    }
-}
-
-static void qerror_set_desc(QError *qerr, const char *fmt)
-{
-    int i;
-
-    // FIXME: inefficient loop
-
-    for (i = 0; qerror_table[i].error_fmt; i++) {
-        if (strcmp(qerror_table[i].error_fmt, fmt) == 0) {
-            qerr->entry = &qerror_table[i];
-            return;
-        }
-    }
-
-    qerror_abort(qerr, "error format '%s' not found", fmt);
-}
-
 /**
  * qerror_from_info(): Create a new QError from error information
  *
- * The information consists of:
- *
- * - file   the file name of where the error occurred
- * - linenr the line number of where the error occurred
- * - func   the function name of where the error occurred
- * - fmt    JSON printf-like dictionary, there must exist keys 'class' and
- *          'data'
- * - va     va_list of all arguments specified by fmt
- *
  * Return strong reference.
  */
-QError *qerror_from_info(const char *file, int linenr, const char *func,
-                         const char *fmt, va_list *va)
+static QError *qerror_from_info(ErrorClass err_class, const char *fmt,
+                                va_list *va)
 {
     QError *qerr;
 
     qerr = qerror_new();
     loc_save(&qerr->loc);
-    qerr->linenr = linenr;
-    qerr->file = file;
-    qerr->func = func;
-
-    if (!fmt) {
-        qerror_abort(qerr, "QDict not specified");
-    }
 
-    qerror_set_data(qerr, fmt, va);
-    qerror_set_desc(qerr, fmt);
+    qerr->err_msg = g_strdup_vprintf(fmt, *va);
+    qerr->err_class = err_class;
 
     return qerr;
 }
 
-static void parse_error(const QErrorStringTable *entry, int c)
-{
-    fprintf(stderr, "expected '%c' in '%s'", c, entry->desc);
-    abort();
-}
-
-static const char *append_field(QDict *error, QString *outstr,
-                                const QErrorStringTable *entry,
-                                const char *start)
-{
-    QObject *obj;
-    QDict *qdict;
-    QString *key_qs;
-    const char *end, *key;
-
-    if (*start != '%')
-        parse_error(entry, '%');
-    start++;
-    if (*start != '(')
-        parse_error(entry, '(');
-    start++;
-
-    end = strchr(start, ')');
-    if (!end)
-        parse_error(entry, ')');
-
-    key_qs = qstring_from_substr(start, 0, end - start - 1);
-    key = qstring_get_str(key_qs);
-
-    qdict = qobject_to_qdict(qdict_get(error, "data"));
-    obj = qdict_get(qdict, key);
-    if (!obj) {
-        abort();
-    }
-
-    switch (qobject_type(obj)) {
-        case QTYPE_QSTRING:
-            qstring_append(outstr, qdict_get_str(qdict, key));
-            break;
-        case QTYPE_QINT:
-            qstring_append_int(outstr, qdict_get_int(qdict, key));
-            break;
-        default:
-            abort();
-    }
-
-    QDECREF(key_qs);
-    return ++end;
-}
-
-static QString *qerror_format_desc(QDict *error,
-                                   const QErrorStringTable *entry)
-{
-    QString *qstring;
-    const char *p;
-
-    assert(entry != NULL);
-
-    qstring = qstring_new();
-
-    for (p = entry->desc; *p != '\0';) {
-        if (*p != '%') {
-            qstring_append_chr(qstring, *p++);
-        } else if (*(p + 1) == '%') {
-            qstring_append_chr(qstring, '%');
-            p += 2;
-        } else {
-            p = append_field(error, qstring, entry, p);
-        }
-    }
-
-    return qstring;
-}
-
-QString *qerror_format(const char *fmt, QDict *error)
-{
-    const QErrorStringTable *entry = NULL;
-    int i;
-
-    for (i = 0; qerror_table[i].error_fmt; i++) {
-        if (strcmp(qerror_table[i].error_fmt, fmt) == 0) {
-            entry = &qerror_table[i];
-            break;
-        }
-    }
-
-    return qerror_format_desc(error, entry);
-}
-
 /**
  * qerror_human(): Format QError data into human-readable string.
  */
 QString *qerror_human(const QError *qerror)
 {
-    return qerror_format_desc(qerror->error, qerror->entry);
+    return qstring_from_str(qerror->err_msg);
 }
 
 /**
@@ -549,7 +71,7 @@ QString *qerror_human(const QError *qerror)
  * it uses error_report() for this, so that the output is routed to the right
  * place (ie. stderr or Monitor's device).
  */
-void qerror_print(QError *qerror)
+static void qerror_print(QError *qerror)
 {
     QString *qstring = qerror_human(qerror);
     loc_push_restore(&qerror->loc);
@@ -558,14 +80,13 @@ void qerror_print(QError *qerror)
     QDECREF(qstring);
 }
 
-void qerror_report_internal(const char *file, int linenr, const char *func,
-                            const char *fmt, ...)
+void qerror_report(ErrorClass eclass, const char *fmt, ...)
 {
     va_list va;
     QError *qerror;
 
     va_start(va, fmt);
-    qerror = qerror_from_info(file, linenr, func, fmt, &va);
+    qerror = qerror_from_info(eclass, fmt, &va);
     va_end(va);
 
     if (monitor_cur_is_qmp()) {
@@ -579,27 +100,18 @@ void qerror_report_internal(const char *file, int linenr, const char *func,
 /* Evil... */
 struct Error
 {
-    QDict *obj;
-    const char *fmt;
     char *msg;
+    ErrorClass err_class;
 };
 
 void qerror_report_err(Error *err)
 {
     QError *qerr;
-    int i;
 
     qerr = qerror_new();
     loc_save(&qerr->loc);
-    QINCREF(err->obj);
-    qerr->error = err->obj;
-
-    for (i = 0; qerror_table[i].error_fmt; i++) {
-        if (strcmp(qerror_table[i].error_fmt, err->fmt) == 0) {
-            qerr->entry = &qerror_table[i];
-            break;
-        }
-    }
+    qerr->err_msg = g_strdup(err->msg);
+    qerr->err_class = err->err_class;
 
     if (monitor_cur_is_qmp()) {
         monitor_set_error(cur_mon, qerr);
@@ -620,7 +132,7 @@ void assert_no_error(Error *err)
 /**
  * qobject_to_qerror(): Convert a QObject into a QError
  */
-QError *qobject_to_qerror(const QObject *obj)
+static QError *qobject_to_qerror(const QObject *obj)
 {
     if (qobject_type(obj) != QTYPE_QERROR) {
         return NULL;
@@ -639,6 +151,6 @@ static void qerror_destroy_obj(QObject *obj)
     assert(obj != NULL);
     qerr = qobject_to_qerror(obj);
 
-    QDECREF(qerr->error);
+    g_free(qerr->err_msg);
     g_free(qerr);
 }
diff --git a/qerror.h b/qerror.h
index b4c8758f40..d0a76a4f71 100644
--- a/qerror.h
+++ b/qerror.h
@@ -16,36 +16,20 @@
 #include "qstring.h"
 #include "qemu-error.h"
 #include "error.h"
+#include "qapi-types.h"
 #include <stdarg.h>
 
-typedef struct QErrorStringTable {
-    const char *desc;
-    const char *error_fmt;
-} QErrorStringTable;
-
 typedef struct QError {
     QObject_HEAD;
-    QDict *error;
     Location loc;
-    int linenr;
-    const char *file;
-    const char *func;
-    const QErrorStringTable *entry;
+    char *err_msg;
+    ErrorClass err_class;
 } QError;
 
-QError *qerror_new(void);
-QError *qerror_from_info(const char *file, int linenr, const char *func,
-                         const char *fmt, va_list *va) GCC_FMT_ATTR(4, 0);
 QString *qerror_human(const QError *qerror);
-void qerror_print(QError *qerror);
-void qerror_report_internal(const char *file, int linenr, const char *func,
-                            const char *fmt, ...) GCC_FMT_ATTR(4, 5);
+void qerror_report(ErrorClass err_class, const char *fmt, ...) GCC_FMT_ATTR(2, 3);
 void qerror_report_err(Error *err);
 void assert_no_error(Error *err);
-QString *qerror_format(const char *fmt, QDict *error);
-#define qerror_report(fmt, ...) \
-    qerror_report_internal(__FILE__, __LINE__, __func__, fmt, ## __VA_ARGS__)
-QError *qobject_to_qerror(const QObject *obj);
 
 /*
  * QError class list
@@ -53,217 +37,213 @@ QError *qobject_to_qerror(const QObject *obj);
  * Use scripts/check-qerror.sh to check.
  */
 #define QERR_ADD_CLIENT_FAILED \
-    "{ 'class': 'AddClientFailed', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Could not add client"
 
 #define QERR_AMBIGUOUS_PATH \
-    "{ 'class': 'AmbiguousPath', 'data': { 'path': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Path '%s' does not uniquely identify an object"
 
 #define QERR_BAD_BUS_FOR_DEVICE \
-    "{ 'class': 'BadBusForDevice', 'data': { 'device': %s, 'bad_bus_type': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' can't go on a %s bus"
 
 #define QERR_BASE_NOT_FOUND \
-    "{ 'class': 'BaseNotFound', 'data': { 'base': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Base '%s' not found"
 
 #define QERR_BLOCK_FORMAT_FEATURE_NOT_SUPPORTED \
-    "{ 'class': 'BlockFormatFeatureNotSupported', 'data': { 'format': %s, 'name': %s, 'feature': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Block format '%s' used by device '%s' does not support feature '%s'"
 
 #define QERR_BUFFER_OVERRUN \
-    "{ 'class': 'BufferOverrun', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "An internal buffer overran"
 
 #define QERR_BUS_NO_HOTPLUG \
-    "{ 'class': 'BusNoHotplug', 'data': { 'bus': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Bus '%s' does not support hotplugging"
 
 #define QERR_BUS_NOT_FOUND \
-    "{ 'class': 'BusNotFound', 'data': { 'bus': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Bus '%s' not found"
 
 #define QERR_COMMAND_DISABLED \
-    "{ 'class': 'CommandDisabled', 'data': { 'name': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "The command %s has been disabled for this instance"
 
 #define QERR_COMMAND_NOT_FOUND \
-    "{ 'class': 'CommandNotFound', 'data': { 'name': %s } }"
+    ERROR_CLASS_COMMAND_NOT_FOUND, "The command %s has not been found"
 
 #define QERR_DEVICE_ENCRYPTED \
-    "{ 'class': 'DeviceEncrypted', 'data': { 'device': %s, 'filename': %s } }"
+    ERROR_CLASS_DEVICE_ENCRYPTED, "'%s' (%s) is encrypted"
 
 #define QERR_DEVICE_FEATURE_BLOCKS_MIGRATION \
-    "{ 'class': 'DeviceFeatureBlocksMigration', 'data': { 'device': %s, 'feature': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Migration is disabled when using feature '%s' in device '%s'"
 
 #define QERR_DEVICE_HAS_NO_MEDIUM \
-    "{ 'class': 'DeviceHasNoMedium', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' has no medium"
 
 #define QERR_DEVICE_INIT_FAILED \
-    "{ 'class': 'DeviceInitFailed', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' could not be initialized"
 
 #define QERR_DEVICE_IN_USE \
-    "{ 'class': 'DeviceInUse', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' is in use"
 
 #define QERR_DEVICE_IS_READ_ONLY \
-    "{ 'class': 'DeviceIsReadOnly', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' is read only"
 
 #define QERR_DEVICE_LOCKED \
-    "{ 'class': 'DeviceLocked', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' is locked"
 
 #define QERR_DEVICE_MULTIPLE_BUSSES \
-    "{ 'class': 'DeviceMultipleBusses', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' has multiple child busses"
 
 #define QERR_DEVICE_NO_BUS \
-    "{ 'class': 'DeviceNoBus', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' has no child bus"
 
 #define QERR_DEVICE_NO_HOTPLUG \
-    "{ 'class': 'DeviceNoHotplug', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' does not support hotplugging"
 
 #define QERR_DEVICE_NOT_ACTIVE \
-    "{ 'class': 'DeviceNotActive', 'data': { 'device': %s } }"
+    ERROR_CLASS_DEVICE_NOT_ACTIVE, "Device '%s' has not been activated"
 
 #define QERR_DEVICE_NOT_ENCRYPTED \
-    "{ 'class': 'DeviceNotEncrypted', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' is not encrypted"
 
 #define QERR_DEVICE_NOT_FOUND \
-    "{ 'class': 'DeviceNotFound', 'data': { 'device': %s } }"
+    ERROR_CLASS_DEVICE_NOT_FOUND, "Device '%s' not found"
 
 #define QERR_DEVICE_NOT_REMOVABLE \
-    "{ 'class': 'DeviceNotRemovable', 'data': { 'device': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Device '%s' is not removable"
 
 #define QERR_DUPLICATE_ID \
-    "{ 'class': 'DuplicateId', 'data': { 'id': %s, 'object': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Duplicate ID '%s' for %s"
 
 #define QERR_FD_NOT_FOUND \
-    "{ 'class': 'FdNotFound', 'data': { 'name': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "File descriptor named '%s' not found"
 
 #define QERR_FD_NOT_SUPPLIED \
-    "{ 'class': 'FdNotSupplied', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "No file descriptor supplied via SCM_RIGHTS"
 
 #define QERR_FEATURE_DISABLED \
-    "{ 'class': 'FeatureDisabled', 'data': { 'name': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "The feature '%s' is not enabled"
 
 #define QERR_INVALID_BLOCK_FORMAT \
-    "{ 'class': 'InvalidBlockFormat', 'data': { 'name': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Invalid block format '%s'"
 
 #define QERR_INVALID_OPTION_GROUP \
-    "{ 'class': 'InvalidOptionGroup', 'data': { 'group': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "There is no option group '%s'"
 
 #define QERR_INVALID_PARAMETER \
-    "{ 'class': 'InvalidParameter', 'data': { 'name': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Invalid parameter '%s'"
 
 #define QERR_INVALID_PARAMETER_COMBINATION \
-    "{ 'class': 'InvalidParameterCombination', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Invalid parameter combination"
 
 #define QERR_INVALID_PARAMETER_TYPE \
-    "{ 'class': 'InvalidParameterType', 'data': { 'name': %s,'expected': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Invalid parameter type for '%s', expected: %s"
 
 #define QERR_INVALID_PARAMETER_VALUE \
-    "{ 'class': 'InvalidParameterValue', 'data': { 'name': %s, 'expected': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Parameter '%s' expects %s"
 
 #define QERR_INVALID_PASSWORD \
-    "{ 'class': 'InvalidPassword', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Password incorrect"
 
 #define QERR_IO_ERROR \
-    "{ 'class': 'IOError', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "An IO error has occurred"
 
 #define QERR_JSON_PARSE_ERROR \
-    "{ 'class': 'JSONParseError', 'data': { 'message': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "JSON parse error, %s"
 
 #define QERR_JSON_PARSING \
-    "{ 'class': 'JSONParsing', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Invalid JSON syntax"
 
 #define QERR_KVM_MISSING_CAP \
-    "{ 'class': 'KVMMissingCap', 'data': { 'capability': %s, 'feature': %s } }"
+    ERROR_CLASS_K_V_M_MISSING_CAP, "Using KVM without %s, %s unavailable"
 
 #define QERR_MIGRATION_ACTIVE \
-    "{ 'class': 'MigrationActive', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "There's a migration process in progress"
 
 #define QERR_MIGRATION_NOT_SUPPORTED \
-    "{ 'class': 'MigrationNotSupported', 'data': {'device': %s} }"
+    ERROR_CLASS_GENERIC_ERROR, "State blocked by non-migratable device '%s'"
 
 #define QERR_MIGRATION_EXPECTED \
-    "{ 'class': 'MigrationExpected', 'data': {} }"
+    ERROR_CLASS_MIGRATION_EXPECTED, "An incoming migration is expected before this command can be executed"
 
 #define QERR_MISSING_PARAMETER \
-    "{ 'class': 'MissingParameter', 'data': { 'name': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Parameter '%s' is missing"
 
 #define QERR_NO_BUS_FOR_DEVICE \
-    "{ 'class': 'NoBusForDevice', 'data': { 'device': %s, 'bus': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "No '%s' bus found for device '%s'"
 
 #define QERR_NOT_SUPPORTED \
-    "{ 'class': 'NotSupported', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Not supported"
 
 #define QERR_OPEN_FILE_FAILED \
-    "{ 'class': 'OpenFileFailed', 'data': { 'filename': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Could not open '%s'"
 
 #define QERR_PERMISSION_DENIED \
-    "{ 'class': 'PermissionDenied', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Insufficient permission to perform this operation"
 
 #define QERR_PROPERTY_NOT_FOUND \
-    "{ 'class': 'PropertyNotFound', 'data': { 'device': %s, 'property': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Property '%s.%s' not found"
 
 #define QERR_PROPERTY_VALUE_BAD \
-    "{ 'class': 'PropertyValueBad', 'data': { 'device': %s, 'property': %s, 'value': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Property '%s.%s' doesn't take value '%s'"
 
 #define QERR_PROPERTY_VALUE_IN_USE \
-    "{ 'class': 'PropertyValueInUse', 'data': { 'device': %s, 'property': %s, 'value': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Property '%s.%s' can't take value '%s', it's in use"
 
 #define QERR_PROPERTY_VALUE_NOT_FOUND \
-    "{ 'class': 'PropertyValueNotFound', 'data': { 'device': %s, 'property': %s, 'value': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Property '%s.%s' can't find value '%s'"
 
 #define QERR_PROPERTY_VALUE_NOT_POWER_OF_2 \
-    "{ 'class': 'PropertyValueNotPowerOf2', 'data': { " \
-    "'device': %s, 'property': %s, 'value': %"PRId64" } }"
+    ERROR_CLASS_GENERIC_ERROR, "Property %s.%s doesn't take value '%" PRId64 "', it's not a power of 2"
 
 #define QERR_PROPERTY_VALUE_OUT_OF_RANGE \
-    "{ 'class': 'PropertyValueOutOfRange', 'data': { 'device': %s, 'property': %s, 'value': %"PRId64", 'min': %"PRId64", 'max': %"PRId64" } }"
+    ERROR_CLASS_GENERIC_ERROR, "Property %s.%s doesn't take value %" PRId64 " (minimum: %" PRId64 ", maximum: %" PRId64 ")"
 
 #define QERR_QGA_COMMAND_FAILED \
-    "{ 'class': 'QgaCommandFailed', 'data': { 'message': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Guest agent command failed, error was '%s'"
 
 #define QERR_QGA_LOGGING_FAILED \
-    "{ 'class': 'QgaLoggingFailed', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Guest agent failed to log non-optional log statement"
 
 #define QERR_QMP_BAD_INPUT_OBJECT \
-    "{ 'class': 'QMPBadInputObject', 'data': { 'expected': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Expected '%s' in QMP input"
 
 #define QERR_QMP_BAD_INPUT_OBJECT_MEMBER \
-    "{ 'class': 'QMPBadInputObjectMember', 'data': { 'member': %s, 'expected': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "QMP input object member '%s' expects '%s'"
 
 #define QERR_QMP_EXTRA_MEMBER \
-    "{ 'class': 'QMPExtraInputObjectMember', 'data': { 'member': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "QMP input object member '%s' is unexpected"
 
 #define QERR_RESET_REQUIRED \
-    "{ 'class': 'ResetRequired', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Resetting the Virtual Machine is required"
 
 #define QERR_SET_PASSWD_FAILED \
-    "{ 'class': 'SetPasswdFailed', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Could not set password"
 
 #define QERR_TOO_MANY_FILES \
-    "{ 'class': 'TooManyFiles', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Too many open files"
 
 #define QERR_UNDEFINED_ERROR \
-    "{ 'class': 'UndefinedError', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "An undefined error has occurred"
 
 #define QERR_UNKNOWN_BLOCK_FORMAT_FEATURE \
-    "{ 'class': 'UnknownBlockFormatFeature', 'data': { 'device': %s, 'format': %s, 'feature': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "'%s' uses a %s feature which is not supported by this qemu version: %s"
 
 #define QERR_UNSUPPORTED \
-    "{ 'class': 'Unsupported', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "this feature or command is not currently supported"
 
 #define QERR_VIRTFS_FEATURE_BLOCKS_MIGRATION \
-    "{ 'class': 'VirtFSFeatureBlocksMigration', 'data': { 'path': %s, 'tag': %s } }"
+    ERROR_CLASS_GENERIC_ERROR, "Migration is disabled when VirtFS export path '%s' is mounted in the guest using mount_tag '%s'"
 
 #define QERR_VNC_SERVER_FAILED \
-    "{ 'class': 'VNCServerFailed', 'data': { 'target': %s } }"
-
-#define QERR_SOCKET_CONNECT_IN_PROGRESS \
-    "{ 'class': 'SockConnectInprogress', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Could not start VNC server on %s"
 
 #define QERR_SOCKET_CONNECT_FAILED \
-    "{ 'class': 'SockConnectFailed', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Failed to connect to socket"
 
 #define QERR_SOCKET_LISTEN_FAILED \
-    "{ 'class': 'SockListenFailed', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Failed to set socket to listening mode"
 
 #define QERR_SOCKET_BIND_FAILED \
-    "{ 'class': 'SockBindFailed', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Failed to bind socket"
 
 #define QERR_SOCKET_CREATE_FAILED \
-    "{ 'class': 'SockCreateFailed', 'data': {} }"
+    ERROR_CLASS_GENERIC_ERROR, "Failed to create socket"
 
 #endif /* QERROR_H */
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 0363d7cca9..527b9f7c24 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -435,8 +435,8 @@ Example:
 -> { "execute": "inject-nmi" }
 <- { "return": {} }
 
-Note: inject-nmi is only supported for x86 guest currently, it will
-      returns "Unsupported" error for non-x86 guest.
+Note: inject-nmi fails when the guest doesn't support injecting.
+      Currently, only x86 guests do.
 
 EQMP
 
@@ -2368,3 +2368,22 @@ EQMP
         .args_type  = "implements:s?,abstract:b?",
         .mhandler.cmd_new = qmp_marshal_input_qom_list_types,
     },
+
+    {
+        .name       = "device-list-properties",
+        .args_type  = "typename:s",
+        .mhandler.cmd_new = qmp_marshal_input_device_list_properties,
+    },
+
+    {
+        .name       = "query-machines",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_machines,
+    },
+
+    {
+        .name       = "query-cpu-definitions",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_cpu_definitions,
+    },
+
diff --git a/qmp.c b/qmp.c
index fee9fb2a9d..6c1e4e8978 100644
--- a/qmp.c
+++ b/qmp.c
@@ -417,3 +417,59 @@ ObjectTypeInfoList *qmp_qom_list_types(bool has_implements,
 
     return ret;
 }
+
+DevicePropertyInfoList *qmp_device_list_properties(const char *typename,
+                                                   Error **errp)
+{
+    ObjectClass *klass;
+    Property *prop;
+    DevicePropertyInfoList *prop_list = NULL;
+
+    klass = object_class_by_name(typename);
+    if (klass == NULL) {
+        error_set(errp, QERR_DEVICE_NOT_FOUND, typename);
+        return NULL;
+    }
+
+    klass = object_class_dynamic_cast(klass, TYPE_DEVICE);
+    if (klass == NULL) {
+        error_set(errp, QERR_INVALID_PARAMETER_VALUE,
+                  "name", TYPE_DEVICE);
+        return NULL;
+    }
+
+    do {
+        for (prop = DEVICE_CLASS(klass)->props; prop && prop->name; prop++) {
+            DevicePropertyInfoList *entry;
+            DevicePropertyInfo *info;
+
+            /*
+             * TODO Properties without a parser are just for dirty hacks.
+             * qdev_prop_ptr is the only such PropertyInfo.  It's marked
+             * for removal.  This conditional should be removed along with
+             * it.
+             */
+            if (!prop->info->set) {
+                continue;           /* no way to set it, don't show */
+            }
+
+            info = g_malloc0(sizeof(*info));
+            info->name = g_strdup(prop->name);
+            info->type = g_strdup(prop->info->legacy_name ?: prop->info->name);
+
+            entry = g_malloc0(sizeof(*entry));
+            entry->value = info;
+            entry->next = prop_list;
+            prop_list = entry;
+        }
+        klass = object_class_get_parent(klass);
+    } while (klass != object_class_by_name(TYPE_DEVICE));
+
+    return prop_list;
+}
+
+CpuDefinitionInfoList GCC_WEAK *qmp_query_cpu_definitions(Error **errp)
+{
+    error_set(errp, QERR_NOT_SUPPORTED);
+    return NULL;
+}
diff --git a/scripts/qapi-commands.py b/scripts/qapi-commands.py
index 9eed40e18a..3c4678dbf1 100644
--- a/scripts/qapi-commands.py
+++ b/scripts/qapi-commands.py
@@ -342,6 +342,7 @@ def gen_command_decl_prologue(header, guard, prefix=""):
 #define %(guard)s
 
 #include "%(prefix)sqapi-types.h"
+#include "qdict.h"
 #include "error.h"
 
 ''',
diff --git a/scripts/qapi-types.py b/scripts/qapi-types.py
index 4a734f58d5..cf601ae2d2 100644
--- a/scripts/qapi-types.py
+++ b/scripts/qapi-types.py
@@ -70,7 +70,7 @@ const char *%(name)s_lookup[] = {
         ret += mcgen('''
     "%(value)s",
 ''',
-                     value=value.lower())
+                     value=value)
 
     ret += mcgen('''
     NULL,
@@ -79,6 +79,16 @@ const char *%(name)s_lookup[] = {
 ''')
     return ret
 
+def generate_enum_name(name):
+    if name.isupper():
+        return c_fun(name)
+    new_name = ''
+    for c in c_fun(name):
+        if c.isupper():
+            new_name += '_'
+        new_name += c
+    return new_name.lstrip('_').upper()
+
 def generate_enum(name, values):
     lookup_decl = mcgen('''
 extern const char *%(name)s_lookup[];
@@ -100,7 +110,7 @@ typedef enum %(name)s
     %(abbrev)s_%(value)s = %(i)d,
 ''',
                      abbrev=de_camel_case(name).upper(),
-                     value=c_fun(value).upper(),
+                     value=generate_enum_name(value),
                      i=i)
         i += 1
 
@@ -253,7 +263,8 @@ fdecl.write(mcgen('''
 #ifndef %(guard)s
 #define %(guard)s
 
-#include "qapi/qapi-types-core.h"
+#include "qemu-common.h"
+
 ''',
                   guard=guardname(h_file)))
 
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index 880cfea3f8..6d5d0d6e10 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -28,6 +28,7 @@
 #include "qemu-config.h"
 
 #include "qapi/qapi-visit-core.h"
+#include "qmp-commands.h"
 
 #include "hyperv.h"
 
@@ -1125,6 +1126,27 @@ void x86_cpu_list(FILE *f, fprintf_function cpu_fprintf, const char *optarg)
     }
 }
 
+CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
+{
+    CpuDefinitionInfoList *cpu_list = NULL;
+    x86_def_t *def;
+
+    for (def = x86_defs; def; def = def->next) {
+        CpuDefinitionInfoList *entry;
+        CpuDefinitionInfo *info;
+
+        info = g_malloc0(sizeof(*info));
+        info->name = g_strdup(def->name);
+
+        entry = g_malloc0(sizeof(*entry));
+        entry->value = info;
+        entry->next = cpu_list;
+        cpu_list = entry;
+    }
+
+    return cpu_list;
+}
+
 int cpu_x86_register(X86CPU *cpu, const char *cpu_model)
 {
     CPUX86State *env = &cpu->env;
diff --git a/target-ppc/translate_init.c b/target-ppc/translate_init.c
index 5742229197..6fe4168dc0 100644
--- a/target-ppc/translate_init.c
+++ b/target-ppc/translate_init.c
@@ -27,6 +27,7 @@
 #include "gdbstub.h"
 #include <kvm.h>
 #include "kvm_ppc.h"
+#include "qmp-commands.h"
 
 //#define PPC_DUMP_CPU
 //#define PPC_DEBUG_SPR
@@ -10345,6 +10346,31 @@ void ppc_cpu_list (FILE *f, fprintf_function cpu_fprintf)
     }
 }
 
+CpuDefinitionInfoList *qmp_query_cpu_definitions(Error **errp)
+{
+    CpuDefinitionInfoList *cpu_list = NULL;
+    int i;
+
+    for (i = 0; i < ARRAY_SIZE(ppc_defs); i++) {
+        CpuDefinitionInfoList *entry;
+        CpuDefinitionInfo *info;
+
+        if (!ppc_cpu_usable(&ppc_defs[i])) {
+            continue;
+        }
+
+        info = g_malloc0(sizeof(*info));
+        info->name = g_strdup(ppc_defs[i].name);
+
+        entry = g_malloc0(sizeof(*entry));
+        entry->value = info;
+        entry->next = cpu_list;
+        cpu_list = entry;
+    }
+
+    return cpu_list;
+}
+
 /* CPUClass::reset() */
 static void ppc_cpu_reset(CPUState *s)
 {
diff --git a/ui/vnc.c b/ui/vnc.c
index 312ad7fe36..385e345c31 100644
--- a/ui/vnc.c
+++ b/ui/vnc.c
@@ -3061,7 +3061,7 @@ int vnc_display_open(DisplayState *ds, const char *display)
         if (strncmp(display, "unix:", 5) == 0)
             vs->lsock = unix_connect(display+5);
         else
-            vs->lsock = inet_connect(display, true, NULL);
+            vs->lsock = inet_connect(display, true, NULL, NULL);
         if (-1 == vs->lsock) {
             g_free(vs->display);
             vs->display = NULL;
diff --git a/vl.c b/vl.c
index 91076f0e7c..d01256a6a3 100644
--- a/vl.c
+++ b/vl.c
@@ -1213,6 +1213,37 @@ QEMUMachine *find_default_machine(void)
     return NULL;
 }
 
+MachineInfoList *qmp_query_machines(Error **errp)
+{
+    MachineInfoList *mach_list = NULL;
+    QEMUMachine *m;
+
+    for (m = first_machine; m; m = m->next) {
+        MachineInfoList *entry;
+        MachineInfo *info;
+
+        info = g_malloc0(sizeof(*info));
+        if (m->is_default) {
+            info->has_is_default = true;
+            info->is_default = true;
+        }
+
+        if (m->alias) {
+            info->has_alias = true;
+            info->alias = g_strdup(m->alias);
+        }
+
+        info->name = g_strdup(m->name);
+
+        entry = g_malloc0(sizeof(*entry));
+        entry->value = info;
+        entry->next = mach_list;
+        mach_list = entry;
+    }
+
+    return mach_list;
+}
+
 /***********************************************************/
 /* main execution loop */
 
@@ -1298,6 +1329,7 @@ static pid_t shutdown_pid;
 static int powerdown_requested;
 static int debug_requested;
 static int suspend_requested;
+static int wakeup_requested;
 static NotifierList suspend_notifiers =
     NOTIFIER_LIST_INITIALIZER(suspend_notifiers);
 static NotifierList wakeup_notifiers =
@@ -1352,6 +1384,13 @@ static int qemu_suspend_requested(void)
     return r;
 }
 
+static int qemu_wakeup_requested(void)
+{
+    int r = wakeup_requested;
+    wakeup_requested = 0;
+    return r;
+}
+
 int qemu_powerdown_requested(void)
 {
     int r = powerdown_requested;
@@ -1457,9 +1496,8 @@ void qemu_system_wakeup_request(WakeupReason reason)
         return;
     }
     runstate_set(RUN_STATE_RUNNING);
-    monitor_protocol_event(QEVENT_WAKEUP, NULL);
     notifier_list_notify(&wakeup_notifiers, &reason);
-    reset_requested = 1;
+    wakeup_requested = 1;
     qemu_notify_event();
 }
 
@@ -1539,6 +1577,13 @@ static bool main_loop_should_exit(void)
             runstate_set(RUN_STATE_PAUSED);
         }
     }
+    if (qemu_wakeup_requested()) {
+        pause_all_vcpus();
+        cpu_synchronize_all_states();
+        qemu_system_reset(VMRESET_SILENT);
+        resume_all_vcpus();
+        monitor_protocol_event(QEVENT_WAKEUP, NULL);
+    }
     if (qemu_powerdown_requested()) {
         monitor_protocol_event(QEVENT_POWERDOWN, NULL);
         qemu_irq_raise(qemu_system_powerdown);