[Qemu-devel] [PATCH v3 00/21] monitor: Wean core off QError, and other cleanups

[Qemu-devel] [PATCH v3 00/21] monitor: Wean core off QError, and other cleanups

[Markus Armbruster]

Command handlers still use QError.  Left for another day.

v3:
* Trivially rebased, R-bys retained.
* PATCH 11: New [Luiz]

v2:
* Trivially rebased, R-bys retained.
* PATCH 01: Drop another async remnant [Eric]
* PATCH 01+02+18: Improve commit messages
* PATCH 03+04: client_migrate_info still hasn't been implemented VNC,
  de-document [Eric, Gerd]
* PATCH 16+19: Don't inline monitor_ctrl_mode() into monitor_init() [Eric]
* PATCH 20: Use false instead of 0 [Eric]

Markus Armbruster (21):
  monitor: Drop broken, unused asynchronous command interface
  monitor: Clean up after previous commit
  monitor: Improve and document client_migrate_info protocol error
  monitor: Convert client_migrate_info to QAPI
  monitor: Use traditional command interface for HMP drive_del
  monitor: Use traditional command interface for HMP device_add
  monitor: Use trad. command interface for HMP pcie_aer_inject_error
  monitor: Drop unused "new" HMP command interface
  monitor: Propagate errors through qmp_check_client_args()
  monitor: Propagate errors through qmp_check_input_obj()
  monitor: Propagate errors through invalid_qmp_mode()
  monitor: Wean monitor_protocol_emitter() off mon->error
  monitor: Inline monitor_has_error() into its only caller
  monitor: Limit QError use to command handlers
  monitor: Rename handle_user_command() to handle_hmp_command()
  monitor: Rename monitor_control_read(), monitor_control_event()
  monitor: Unbox Monitor member mc and rename to qmp
  monitor: Drop do_qmp_capabilities()'s superfluous QMP check
  monitor: Turn int command_mode into bool in_command_mode
  monitor: Rename monitor_ctrl_mode() to monitor_is_qmp()
  monitor: Change return type of monitor_cur_is_qmp() to bool

 blockdev.c                |   9 +-
 hmp-commands.hx           |  20 +--
 hmp.c                     |  23 +++
 hmp.h                     |   2 +
 hw/pci/pci-stub.c         |  14 +-
 hw/pci/pcie_aer.c         |  39 +++--
 include/monitor/monitor.h |   7 +-
 include/sysemu/blockdev.h |   2 +-
 include/sysemu/sysemu.h   |   4 +-
 monitor.c                 | 398 ++++++++++++++++------------------------------
 qapi-schema.json          |  19 +++
 qmp-commands.hx           |  16 +-
 stubs/mon-is-qmp.c        |   4 +-
 13 files changed, 232 insertions(+), 325 deletions(-)

-- 
1.9.3

[Qemu-devel] [PATCH v3 01/21] monitor: Drop broken, unused asynchronous command interface

[Markus Armbruster]

The asynchronous monitor command interface goes back to commit 940cc30
(Jan 2010).  Added a third case to command execution.  The hope back
then according to the commit message was that all commands get
converted to the asynchronous interface, killing off the other two
cases.  Didn't happen.

The initial asynchronous commands balloon and info balloon were
converted back to synchronous long ago (commit 96637bc and d72f32),
with commit messages calling the asynchronous interface "not fully
working" and "deprecated".  The only other user went away in commit
3b5704b.

New code generally uses synchronous commands and asynchronous events.

What exactly is still "not fully working" with asynchronous commands?
Well, here's a bug that defeats actual asynchronous use pretty
reliably: the reply's ID is wrong (and has always been wrong) unless
you use the command synchronously!  To reproduce, we need an
asynchronous command, so we have to go back before commit 3b5704b.
Run QEMU with spice:

    $ qemu-system-x86_64 -nodefaults -S -spice port=5900,disable-ticketing -qmp stdio
    {"QMP": {"version": {"qemu": {"micro": 94, "minor": 2, "major": 2}, "package": ""}, "capabilities": []}}

Connect a spice client in another terminal:

    $ remote-viewer spice://localhost:5900

Set up a migration destination dummy in a third terminal:

    $ socat TCP-LISTEN:12345 STDIO

Now paste the following into the QMP monitor:

    { "execute": "qmp_capabilities", "id": "i0" }
    { "execute": "client_migrate_info", "id": "i1", "arguments": { "protocol": "spice", "hostname": "localhost", "port": 12345 } }
    { "execute": "query-kvm", "id": "i2" }

Produces two replies immediately, one to qmp_capabilities, and one to
query-kvm:

    {"return": {}, "id": "i0"}
    {"return": {"enabled": false, "present": true}, "id": "i2"}

Both are correct.  Two lines of debug output from libspice-server not
shown.

Now EOF socat's standard input to make it close the connection.  This
makes the asynchronous client_migrate_info complete.  It replies:

    {"return": {}}

Bug: "id": "i1" is missing.  Two lines of debug output from
libspice-server not shown.  Cherry on top: storage for the missing ID
is leaked.

Get rid of this stuff before somebody hurts himself with it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 include/monitor/monitor.h |  5 ----
 monitor.c                 | 70 ++---------------------------------------------
 2 files changed, 2 insertions(+), 73 deletions(-)

diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index df67d56..d409b6a 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -16,9 +16,6 @@ extern Monitor *default_mon;
 #define MONITOR_USE_CONTROL   0x04
 #define MONITOR_USE_PRETTY    0x08
 
-/* flags for monitor commands */
-#define MONITOR_CMD_ASYNC       0x0001
-
 int monitor_cur_is_qmp(void);
 
 void monitor_init(CharDriverState *chr, int flags);
@@ -43,8 +40,6 @@ void monitor_flush(Monitor *mon);
 int monitor_set_cpu(int cpu_index);
 int monitor_get_cpu_index(void);
 
-typedef void (MonitorCompletion)(void *opaque, QObject *ret_data);
-
 void monitor_set_error(Monitor *mon, QError *qerror);
 void monitor_read_command(Monitor *mon, int show_prompt);
 int monitor_read_password(Monitor *mon, ReadLineFunc *readline_func,
diff --git a/monitor.c b/monitor.c
index b2561e1..27efeb6 100644
--- a/monitor.c
+++ b/monitor.c
@@ -118,12 +118,6 @@
  *
  */
 
-typedef struct MonitorCompletionData MonitorCompletionData;
-struct MonitorCompletionData {
-    Monitor *mon;
-    void (*user_print)(Monitor *mon, const QObject *data);
-};
-
 typedef struct mon_cmd_t {
     const char *name;
     const char *args_type;
@@ -133,10 +127,7 @@ typedef struct mon_cmd_t {
     union {
         void (*cmd)(Monitor *mon, const QDict *qdict);
         int  (*cmd_new)(Monitor *mon, const QDict *params, QObject **ret_data);
-        int  (*cmd_async)(Monitor *mon, const QDict *params,
-                          MonitorCompletion *cb, void *opaque);
     } mhandler;
-    int flags;
     /* @sub_table is a list of 2nd level of commands. If it do not exist,
      * mhandler should be used. If it exist, sub_table[?].mhandler should be
      * used, and mhandler of 1st level plays the role of help function.
@@ -394,11 +385,6 @@ static inline int handler_is_qobject(const mon_cmd_t *cmd)
     return cmd->user_print != NULL;
 }
 
-static inline bool handler_is_async(const mon_cmd_t *cmd)
-{
-    return cmd->flags & MONITOR_CMD_ASYNC;
-}
-
 static inline int monitor_has_error(const Monitor *mon)
 {
     return mon->error != NULL;
@@ -917,45 +903,6 @@ static void hmp_trace_file(Monitor *mon, const QDict *qdict)
 }
 #endif
 
-static void user_monitor_complete(void *opaque, QObject *ret_data)
-{
-    MonitorCompletionData *data = (MonitorCompletionData *)opaque; 
-
-    if (ret_data) {
-        data->user_print(data->mon, ret_data);
-    }
-    monitor_resume(data->mon);
-    g_free(data);
-}
-
-static void qmp_monitor_complete(void *opaque, QObject *ret_data)
-{
-    monitor_protocol_emitter(opaque, ret_data);
-}
-
-static int qmp_async_cmd_handler(Monitor *mon, const mon_cmd_t *cmd,
-                                 const QDict *params)
-{
-    return cmd->mhandler.cmd_async(mon, params, qmp_monitor_complete, mon);
-}
-
-static void user_async_cmd_handler(Monitor *mon, const mon_cmd_t *cmd,
-                                   const QDict *params)
-{
-    int ret;
-
-    MonitorCompletionData *cb_data = g_malloc(sizeof(*cb_data));
-    cb_data->mon = mon;
-    cb_data->user_print = cmd->user_print;
-    monitor_suspend(mon);
-    ret = cmd->mhandler.cmd_async(mon, params,
-                                  user_monitor_complete, cb_data);
-    if (ret < 0) {
-        monitor_resume(mon);
-        g_free(cb_data);
-    }
-}
-
 static void hmp_info_help(Monitor *mon, const QDict *qdict)
 {
     help_cmd(mon, "info");
@@ -4121,9 +4068,7 @@ static void handle_user_command(Monitor *mon, const char *cmdline)
     if (!cmd)
         goto out;
 
-    if (handler_is_async(cmd)) {
-        user_async_cmd_handler(mon, cmd, qdict);
-    } else if (handler_is_qobject(cmd)) {
+    if (handler_is_qobject(cmd)) {
         QObject *data = NULL;
 
         /* XXX: ignores the error code */
@@ -5054,8 +4999,6 @@ static QDict *qmp_check_input_obj(QObject *input_obj)
                               "object");
                 return NULL;
             }
-        } else if (!strcmp(arg_name, "id")) {
-            /* FIXME: check duplicated IDs for async commands */
         } else {
             qerror_report(QERR_QMP_EXTRA_MEMBER, arg_name);
             return NULL;
@@ -5134,16 +5077,7 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         goto err_out;
     }
 
-    if (handler_is_async(cmd)) {
-        err = qmp_async_cmd_handler(mon, cmd, args);
-        if (err) {
-            /* emit the error response */
-            goto err_out;
-        }
-    } else {
-        qmp_call_cmd(mon, cmd, args);
-    }
-
+    qmp_call_cmd(mon, cmd, args);
     goto out;
 
 err_out:
-- 
1.9.3

[Qemu-devel] [PATCH v3 02/21] monitor: Clean up after previous commit

[Markus Armbruster]

Inline qmp_call_cmd() along with its helper handler_audit() into its
only caller handle_qmp_command(), and simplify the result.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 40 +++++++++++-----------------------------
 1 file changed, 11 insertions(+), 29 deletions(-)

diff --git a/monitor.c b/monitor.c
index 27efeb6..416ba10 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4045,18 +4045,6 @@ void monitor_set_error(Monitor *mon, QError *qerror)
     }
 }
 
-static void handler_audit(Monitor *mon, const mon_cmd_t *cmd, int ret)
-{
-    if (ret && !monitor_has_error(mon)) {
-        /*
-         * If it returns failure, it must have passed on error.
-         *
-         * Action: Report an internal error to the client if in QMP.
-         */
-        qerror_report(QERR_UNDEFINED_ERROR);
-    }
-}
-
 static void handle_user_command(Monitor *mon, const char *cmdline)
 {
     QDict *qdict;
@@ -5013,28 +5001,17 @@ static QDict *qmp_check_input_obj(QObject *input_obj)
     return input_dict;
 }
 
-static void qmp_call_cmd(Monitor *mon, const mon_cmd_t *cmd,
-                         const QDict *params)
-{
-    int ret;
-    QObject *data = NULL;
-
-    ret = cmd->mhandler.cmd_new(mon, params, &data);
-    handler_audit(mon, cmd, ret);
-    monitor_protocol_emitter(mon, data);
-    qobject_decref(data);
-}
-
 static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
 {
     int err;
-    QObject *obj;
+    QObject *obj, *data;
     QDict *input, *args;
     const mon_cmd_t *cmd;
     const char *cmd_name;
     Monitor *mon = cur_mon;
 
     args = input = NULL;
+    data = NULL;
 
     obj = json_parser_parse(tokens, NULL);
     if (!obj) {
@@ -5077,12 +5054,17 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         goto err_out;
     }
 
-    qmp_call_cmd(mon, cmd, args);
-    goto out;
+    if (cmd->mhandler.cmd_new(mon, args, &data)) {
+        /* Command failed... */
+        if (!monitor_has_error(mon)) {
+            /* ... without setting an error, so make one up */
+            qerror_report(QERR_UNDEFINED_ERROR);
+        }
+    }
 
 err_out:
-    monitor_protocol_emitter(mon, NULL);
-out:
+    monitor_protocol_emitter(mon, data);
+    qobject_decref(data);
     QDECREF(input);
     QDECREF(args);
 }
-- 
1.9.3

[Qemu-devel] [PATCH v3 03/21] monitor: Improve and document client_migrate_info protocol error

[Markus Armbruster]

Protocol must be spice, vnc isn't implemented.  Fix up documentation.

Attempts to use vnc or any other unknown protocol yield the misleading
error message "Invalid parameter 'protocol'".  Improve it to
"Parameter 'protocol' expects spice".

Cc: Gerd Hoffmann <kraxel@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by. Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 hmp-commands.hx |  8 ++++----
 monitor.c       |  2 +-
 qmp-commands.hx | 14 +++++++-------
 3 files changed, 12 insertions(+), 12 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index e864a6c..0cf592b 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1011,7 +1011,7 @@ ETEXI
         .name       = "client_migrate_info",
         .args_type  = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
         .params     = "protocol hostname port tls-port cert-subject",
-        .help       = "send migration info to spice/vnc client",
+        .help       = "set migration information for remote display",
         .user_print = monitor_user_noop,
         .mhandler.cmd_new = client_migrate_info,
     },
@@ -1019,9 +1019,9 @@ ETEXI
 STEXI
 @item client_migrate_info @var{protocol} @var{hostname} @var{port} @var{tls-port} @var{cert-subject}
 @findex client_migrate_info
-Set the spice/vnc connection info for the migration target.  The spice/vnc
-server will ask the spice/vnc client to automatically reconnect using the
-new parameters (if specified) once the vm migration finished successfully.
+Set migration information for remote display.  This makes the server
+ask the client to automatically reconnect using the new parameters
+once migration finished successfully.  Only implemented for SPICE.
 ETEXI
 
     {
diff --git a/monitor.c b/monitor.c
index 416ba10..8170309 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1063,7 +1063,7 @@ static int client_migrate_info(Monitor *mon, const QDict *qdict,
         return 0;
     }
 
-    qerror_report(QERR_INVALID_PARAMETER, "protocol");
+    qerror_report(QERR_INVALID_PARAMETER_VALUE, "protocol", "spice");
     return -1;
 }
 
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 14e109e..a9768a2 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -784,23 +784,23 @@ EQMP
         .name       = "client_migrate_info",
         .args_type  = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
         .params     = "protocol hostname port tls-port cert-subject",
-        .help       = "send migration info to spice/vnc client",
+        .help       = "set migration information for remote display",
         .mhandler.cmd_new = client_migrate_info,
     },
 
 SQMP
 client_migrate_info
-------------------
+-------------------
 
-Set the spice/vnc connection info for the migration target.  The spice/vnc
-server will ask the spice/vnc client to automatically reconnect using the
-new parameters (if specified) once the vm migration finished successfully.
+Set migration information for remote display.  This makes the server
+ask the client to automatically reconnect using the new parameters
+once migration finished successfully.  Only implemented for SPICE.
 
 Arguments:
 
-- "protocol":     protocol: "spice" or "vnc" (json-string)
+- "protocol":     must be "spice" (json-string)
 - "hostname":     migration target hostname (json-string)
-- "port":         spice/vnc tcp port for plaintext channels (json-int, optional)
+- "port":         spice tcp port for plaintext channels (json-int, optional)
 - "tls-port":     spice tcp port for tls-secured channels (json-int, optional)
 - "cert-subject": server certificate subject (json-string, optional)
 
-- 
1.9.3

[Qemu-devel] [PATCH v3 04/21] monitor: Convert client_migrate_info to QAPI

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 hmp-commands.hx  |  3 +--
 hmp.c            | 17 +++++++++++++++++
 hmp.h            |  1 +
 monitor.c        | 42 ++++++++++++++++++------------------------
 qapi-schema.json | 19 +++++++++++++++++++
 qmp-commands.hx  |  2 +-
 6 files changed, 57 insertions(+), 27 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 0cf592b..af2de61 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1012,8 +1012,7 @@ ETEXI
         .args_type  = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
         .params     = "protocol hostname port tls-port cert-subject",
         .help       = "set migration information for remote display",
-        .user_print = monitor_user_noop,
-        .mhandler.cmd_new = client_migrate_info,
+        .mhandler.cmd = hmp_client_migrate_info,
     },
 
 STEXI
diff --git a/hmp.c b/hmp.c
index e17852d..5a43f9d 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1250,6 +1250,23 @@ void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict)
     }
 }
 
+void hmp_client_migrate_info(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+    const char *protocol = qdict_get_str(qdict, "protocol");
+    const char *hostname = qdict_get_str(qdict, "hostname");
+    bool has_port        = qdict_haskey(qdict, "port");
+    int port             = qdict_get_try_int(qdict, "port", -1);
+    bool has_tls_port    = qdict_haskey(qdict, "tls-port");
+    int tls_port         = qdict_get_try_int(qdict, "tls-port", -1);
+    const char *cert_subject = qdict_get_try_str(qdict, "cert-subject");
+
+    qmp_client_migrate_info(protocol, hostname,
+                            has_port, port, has_tls_port, tls_port,
+                            !!cert_subject, cert_subject, &err);
+    hmp_handle_error(mon, &err);
+}
+
 void hmp_set_password(Monitor *mon, const QDict *qdict)
 {
     const char *protocol  = qdict_get_str(qdict, "protocol");
diff --git a/hmp.h b/hmp.h
index a158e3f..b81439c 100644
--- a/hmp.h
+++ b/hmp.h
@@ -67,6 +67,7 @@ void hmp_migrate_set_speed(Monitor *mon, const QDict *qdict);
 void hmp_migrate_set_capability(Monitor *mon, const QDict *qdict);
 void hmp_migrate_set_parameter(Monitor *mon, const QDict *qdict);
 void hmp_migrate_set_cache_size(Monitor *mon, const QDict *qdict);
+void hmp_client_migrate_info(Monitor *mon, const QDict *qdict);
 void hmp_set_password(Monitor *mon, const QDict *qdict);
 void hmp_expire_password(Monitor *mon, const QDict *qdict);
 void hmp_eject(Monitor *mon, const QDict *qdict);
diff --git a/monitor.c b/monitor.c
index 8170309..38ff972 100644
--- a/monitor.c
+++ b/monitor.c
@@ -1032,39 +1032,33 @@ static void hmp_info_trace_events(Monitor *mon, const QDict *qdict)
     qapi_free_TraceEventInfoList(events);
 }
 
-static int client_migrate_info(Monitor *mon, const QDict *qdict,
-                               QObject **ret_data)
+void qmp_client_migrate_info(const char *protocol, const char *hostname,
+                             bool has_port, int64_t port,
+                             bool has_tls_port, int64_t tls_port,
+                             bool has_cert_subject, const char *cert_subject,
+                             Error **errp)
 {
-    const char *protocol = qdict_get_str(qdict, "protocol");
-    const char *hostname = qdict_get_str(qdict, "hostname");
-    const char *subject  = qdict_get_try_str(qdict, "cert-subject");
-    int port             = qdict_get_try_int(qdict, "port", -1);
-    int tls_port         = qdict_get_try_int(qdict, "tls-port", -1);
-    Error *err = NULL;
-    int ret;
-
     if (strcmp(protocol, "spice") == 0) {
-        if (!qemu_using_spice(&err)) {
-            qerror_report_err(err);
-            error_free(err);
-            return -1;
+        if (!qemu_using_spice(errp)) {
+            return;
         }
 
-        if (port == -1 && tls_port == -1) {
-            qerror_report(QERR_MISSING_PARAMETER, "port/tls-port");
-            return -1;
+        if (!has_port && !has_tls_port) {
+            error_set(errp, QERR_MISSING_PARAMETER, "port/tls-port");
+            return;
         }
 
-        ret = qemu_spice_migrate_info(hostname, port, tls_port, subject);
-        if (ret != 0) {
-            qerror_report(QERR_UNDEFINED_ERROR);
-            return -1;
+        if (qemu_spice_migrate_info(hostname,
+                                    has_port ? port : -1,
+                                    has_tls_port ? tls_port : -1,
+                                    cert_subject)) {
+            error_set(errp, QERR_UNDEFINED_ERROR);
+            return;
         }
-        return 0;
+        return;
     }
 
-    qerror_report(QERR_INVALID_PARAMETER_VALUE, "protocol", "spice");
-    return -1;
+    error_set(errp, QERR_INVALID_PARAMETER_VALUE, "protocol", "spice");
 }
 
 static void hmp_logfile(Monitor *mon, const QDict *qdict)
diff --git a/qapi-schema.json b/qapi-schema.json
index f97ffa1..d052f10 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -638,6 +638,25 @@
   'returns': 'MigrationParameters' }
 
 ##
+# @client_migrate_info
+#
+# Set migration information for remote display.  This makes the server
+# ask the client to automatically reconnect using the new parameters
+# once migration finished successfully.  Only implemented for SPICE.
+#
+# @protocol:     must be "spice"
+# @hostname:     migration target hostname
+# @port:         #optional spice tcp port for plaintext channels
+# @tls-port:     #optional spice tcp port for tls-secured channels
+# @cert-subject: #optional server certificate subject
+#
+# Since: 0.14.0
+##
+{ 'command': 'client_migrate_info',
+  'data': { 'protocol': 'str', 'hostname': 'str', '*port': 'int',
+            '*tls-port': 'int', '*cert-subject': 'str' } }
+
+##
 # @MouseInfo:
 #
 # Information about a mouse device.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index a9768a2..867a21f 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -785,7 +785,7 @@ EQMP
         .args_type  = "protocol:s,hostname:s,port:i?,tls-port:i?,cert-subject:s?",
         .params     = "protocol hostname port tls-port cert-subject",
         .help       = "set migration information for remote display",
-        .mhandler.cmd_new = client_migrate_info,
+        .mhandler.cmd_new = qmp_marshal_input_client_migrate_info,
     },
 
 SQMP
-- 
1.9.3

[Qemu-devel] [PATCH v3 05/21] monitor: Use traditional command interface for HMP drive_del

[Markus Armbruster]

All QMP commands use the "new" handler interface (mhandler.cmd_new).
Most HMP commands still use the traditional interface (mhandler.cmd),
but a few use the "new" one.  Complicates handle_user_command() for no
gain, so I'm converting these to the traditional interface.

For drive_del, that's easy: hmp_drive_del() sheds its unused last
parameter, and its return value, which the caller ignored anyway.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 blockdev.c                | 9 ++++-----
 hmp-commands.hx           | 3 +--
 include/sysemu/blockdev.h | 2 +-
 3 files changed, 6 insertions(+), 8 deletions(-)

diff --git a/blockdev.c b/blockdev.c
index 5eaf77e..de94a8b 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -2113,7 +2113,7 @@ void qmp_block_dirty_bitmap_clear(const char *node, const char *name,
     aio_context_release(aio_context);
 }
 
-int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
+void hmp_drive_del(Monitor *mon, const QDict *qdict)
 {
     const char *id = qdict_get_str(qdict, "id");
     BlockBackend *blk;
@@ -2124,14 +2124,14 @@ int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
     blk = blk_by_name(id);
     if (!blk) {
         error_report("Device '%s' not found", id);
-        return -1;
+        return;
     }
     bs = blk_bs(blk);
 
     if (!blk_legacy_dinfo(blk)) {
         error_report("Deleting device added with blockdev-add"
                      " is not supported");
-        return -1;
+        return;
     }
 
     aio_context = bdrv_get_aio_context(bs);
@@ -2140,7 +2140,7 @@ int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
     if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_DRIVE_DEL, &local_err)) {
         error_report_err(local_err);
         aio_context_release(aio_context);
-        return -1;
+        return;
     }
 
     /* quiesce block driver; prevent further io */
@@ -2163,7 +2163,6 @@ int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data)
     }
 
     aio_context_release(aio_context);
-    return 0;
 }
 
 void qmp_block_resize(bool has_device, const char *device,
diff --git a/hmp-commands.hx b/hmp-commands.hx
index af2de61..5257969 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -178,8 +178,7 @@ ETEXI
         .args_type  = "id:B",
         .params     = "device",
         .help       = "remove host block device",
-        .user_print = monitor_user_noop,
-        .mhandler.cmd_new = hmp_drive_del,
+        .mhandler.cmd = hmp_drive_del,
     },
 
 STEXI
diff --git a/include/sysemu/blockdev.h b/include/sysemu/blockdev.h
index 7ca59b5..3104150 100644
--- a/include/sysemu/blockdev.h
+++ b/include/sysemu/blockdev.h
@@ -66,5 +66,5 @@ DriveInfo *drive_new(QemuOpts *arg, BlockInterfaceType block_default_type);
 void qmp_change_blockdev(const char *device, const char *filename,
                          const char *format, Error **errp);
 void hmp_commit(Monitor *mon, const QDict *qdict);
-int hmp_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
+void hmp_drive_del(Monitor *mon, const QDict *qdict);
 #endif
-- 
1.9.3

[Qemu-devel] [PATCH v3 06/21] monitor: Use traditional command interface for HMP device_add

[Markus Armbruster]

All QMP commands use the "new" handler interface (mhandler.cmd_new).
Most HMP commands still use the traditional interface (mhandler.cmd),
but a few use the "new" one.  Complicates handle_user_command() for no
gain, so I'm converting these to the traditional interface.

For device_add, that's easy: just wrap the obvious hmp_device_add()
around do_device_add().

monitor_user_noop() is now unused, drop it.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 hmp-commands.hx | 3 +--
 hmp.c           | 6 ++++++
 hmp.h           | 1 +
 monitor.c       | 2 --
 4 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 5257969..eff2f97 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -653,8 +653,7 @@ ETEXI
         .args_type  = "device:O",
         .params     = "driver[,prop=value][,...]",
         .help       = "add device, like -device on the command line",
-        .user_print = monitor_user_noop,
-        .mhandler.cmd_new = do_device_add,
+        .mhandler.cmd = hmp_device_add,
         .command_completion = device_add_completion,
     },
 
diff --git a/hmp.c b/hmp.c
index 5a43f9d..514f22f 100644
--- a/hmp.c
+++ b/hmp.c
@@ -22,6 +22,7 @@
 #include "qmp-commands.h"
 #include "qemu/sockets.h"
 #include "monitor/monitor.h"
+#include "monitor/qdev.h"
 #include "qapi/opts-visitor.h"
 #include "qapi/string-output-visitor.h"
 #include "qapi-visit.h"
@@ -1499,6 +1500,11 @@ void hmp_migrate(Monitor *mon, const QDict *qdict)
     }
 }
 
+void hmp_device_add(Monitor *mon, const QDict *qdict)
+{
+    do_device_add(mon, qdict, NULL);
+}
+
 void hmp_device_del(Monitor *mon, const QDict *qdict)
 {
     const char *id = qdict_get_str(qdict, "id");
diff --git a/hmp.h b/hmp.h
index b81439c..a70ac4f 100644
--- a/hmp.h
+++ b/hmp.h
@@ -80,6 +80,7 @@ void hmp_block_job_pause(Monitor *mon, const QDict *qdict);
 void hmp_block_job_resume(Monitor *mon, const QDict *qdict);
 void hmp_block_job_complete(Monitor *mon, const QDict *qdict);
 void hmp_migrate(Monitor *mon, const QDict *qdict);
+void hmp_device_add(Monitor *mon, const QDict *qdict);
 void hmp_device_del(Monitor *mon, const QDict *qdict);
 void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict);
 void hmp_netdev_add(Monitor *mon, const QDict *qdict);
diff --git a/monitor.c b/monitor.c
index 38ff972..85bb71e 100644
--- a/monitor.c
+++ b/monitor.c
@@ -378,8 +378,6 @@ static int GCC_FMT_ATTR(2, 3) monitor_fprintf(FILE *stream,
     return 0;
 }
 
-static void monitor_user_noop(Monitor *mon, const QObject *data) { }
-
 static inline int handler_is_qobject(const mon_cmd_t *cmd)
 {
     return cmd->user_print != NULL;
-- 
1.9.3

[Qemu-devel] [PATCH v3 07/21] monitor: Use trad. command interface for HMP pcie_aer_inject_error

[Markus Armbruster]

All QMP commands use the "new" handler interface (mhandler.cmd_new).
Most HMP commands still use the traditional interface (mhandler.cmd),
but a few use the "new" one.  Complicates handle_user_command() for no
gain, so I'm converting these to the traditional interface.

pcie_aer_inject_error's implementation is split into the
hmp_pcie_aer_inject_error() and pcie_aer_inject_error_print().  The
former is a peculiar crossbreed between HMP and QMP handler.  On
success, it works like a QMP handler: store QDict through ret_data
parameter, return 0.  Printing the QDict is left to
pcie_aer_inject_error_print().  On failure, it works more like an HMP
handler: print error to monitor, return negative number.

To convert to the traditional interface, turn
pcie_aer_inject_error_print() into a command handler wrapping around
hmp_pcie_aer_inject_error().  By convention, this command handler
should be called hmp_pcie_aer_inject_error(), so rename the existing
hmp_pcie_aer_inject_error() to do_pcie_aer_inject_error().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 hmp-commands.hx         |  3 +--
 hw/pci/pci-stub.c       | 14 +-------------
 hw/pci/pcie_aer.c       | 39 ++++++++++++++++++++++-----------------
 include/sysemu/sysemu.h |  4 +---
 4 files changed, 25 insertions(+), 35 deletions(-)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index eff2f97..3d7dfcc 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1183,8 +1183,7 @@ ETEXI
                       "<error_status> = error string or 32bit\n\t\t\t"
                       "<tlb header> = 32bit x 4\n\t\t\t"
                       "<tlb header prefix> = 32bit x 4",
-        .user_print  = pcie_aer_inject_error_print,
-        .mhandler.cmd_new = hmp_pcie_aer_inject_error,
+        .mhandler.cmd = hmp_pcie_aer_inject_error,
     },
 
 STEXI
diff --git a/hw/pci/pci-stub.c b/hw/pci/pci-stub.c
index 5e564c3..f8f237e 100644
--- a/hw/pci/pci-stub.c
+++ b/hw/pci/pci-stub.c
@@ -29,19 +29,7 @@ PciInfoList *qmp_query_pci(Error **errp)
     return NULL;
 }
 
-static void pci_error_message(Monitor *mon)
+void hmp_pcie_aer_inject_error(Monitor *mon, const QDict *qdict)
 {
     monitor_printf(mon, "PCI devices not supported\n");
 }
-
-int hmp_pcie_aer_inject_error(Monitor *mon,
-                             const QDict *qdict, QObject **ret_data)
-{
-    pci_error_message(mon);
-    return -ENOSYS;
-}
-
-void pcie_aer_inject_error_print(Monitor *mon, const QObject *data)
-{
-    pci_error_message(mon);
-}
diff --git a/hw/pci/pcie_aer.c b/hw/pci/pcie_aer.c
index b48c09c..c8dea8e 100644
--- a/hw/pci/pcie_aer.c
+++ b/hw/pci/pcie_aer.c
@@ -815,21 +815,6 @@ const VMStateDescription vmstate_pcie_aer_log = {
     }
 };
 
-void pcie_aer_inject_error_print(Monitor *mon, const QObject *data)
-{
-    QDict *qdict;
-    int devfn;
-    assert(qobject_type(data) == QTYPE_QDICT);
-    qdict = qobject_to_qdict(data);
-
-    devfn = (int)qdict_get_int(qdict, "devfn");
-    monitor_printf(mon, "OK id: %s root bus: %s, bus: %x devfn: %x.%x\n",
-                   qdict_get_str(qdict, "id"),
-                   qdict_get_str(qdict, "root_bus"),
-                   (int) qdict_get_int(qdict, "bus"),
-                   PCI_SLOT(devfn), PCI_FUNC(devfn));
-}
-
 typedef struct PCIEAERErrorName {
     const char *name;
     uint32_t val;
@@ -962,8 +947,8 @@ static int pcie_aer_parse_error_string(const char *error_name,
     return -EINVAL;
 }
 
-int hmp_pcie_aer_inject_error(Monitor *mon,
-                             const QDict *qdict, QObject **ret_data)
+static int do_pcie_aer_inject_error(Monitor *mon,
+                                    const QDict *qdict, QObject **ret_data)
 {
     const char *id = qdict_get_str(qdict, "id");
     const char *error_name;
@@ -1035,3 +1020,23 @@ int hmp_pcie_aer_inject_error(Monitor *mon,
 
     return 0;
 }
+
+void hmp_pcie_aer_inject_error(Monitor *mon, const QDict *qdict)
+{
+    QObject *data;
+    int devfn;
+
+    if (do_pcie_aer_inject_error(mon, qdict, &data) < 0) {
+        return;
+    }
+
+    assert(qobject_type(data) == QTYPE_QDICT);
+    qdict = qobject_to_qdict(data);
+
+    devfn = (int)qdict_get_int(qdict, "devfn");
+    monitor_printf(mon, "OK id: %s root bus: %s, bus: %x devfn: %x.%x\n",
+                   qdict_get_str(qdict, "id"),
+                   qdict_get_str(qdict, "root_bus"),
+                   (int) qdict_get_int(qdict, "bus"),
+                   PCI_SLOT(devfn), PCI_FUNC(devfn));
+}
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 8a52934..e10c2c5 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -161,9 +161,7 @@ extern unsigned int nb_prom_envs;
 void hmp_drive_add(Monitor *mon, const QDict *qdict);
 
 /* pcie aer error injection */
-void pcie_aer_inject_error_print(Monitor *mon, const QObject *data);
-int hmp_pcie_aer_inject_error(Monitor *mon,
-                             const QDict *qdict, QObject **ret_data);
+void hmp_pcie_aer_inject_error(Monitor *mon, const QDict *qdict);
 
 /* serial ports */
 
-- 
1.9.3

[Qemu-devel] [PATCH v3 08/21] monitor: Drop unused "new" HMP command interface

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 22 +---------------------
 1 file changed, 1 insertion(+), 21 deletions(-)

diff --git a/monitor.c b/monitor.c
index 85bb71e..9403c2c 100644
--- a/monitor.c
+++ b/monitor.c
@@ -123,7 +123,6 @@ typedef struct mon_cmd_t {
     const char *args_type;
     const char *params;
     const char *help;
-    void (*user_print)(Monitor *mon, const QObject *data);
     union {
         void (*cmd)(Monitor *mon, const QDict *qdict);
         int  (*cmd_new)(Monitor *mon, const QDict *params, QObject **ret_data);
@@ -378,11 +377,6 @@ static int GCC_FMT_ATTR(2, 3) monitor_fprintf(FILE *stream,
     return 0;
 }
 
-static inline int handler_is_qobject(const mon_cmd_t *cmd)
-{
-    return cmd->user_print != NULL;
-}
-
 static inline int monitor_has_error(const Monitor *mon)
 {
     return mon->error != NULL;
@@ -4045,24 +4039,10 @@ static void handle_user_command(Monitor *mon, const char *cmdline)
     qdict = qdict_new();
 
     cmd = monitor_parse_command(mon, cmdline, 0, mon->cmd_table, qdict);
-    if (!cmd)
-        goto out;
-
-    if (handler_is_qobject(cmd)) {
-        QObject *data = NULL;
-
-        /* XXX: ignores the error code */
-        cmd->mhandler.cmd_new(mon, qdict, &data);
-        assert(!monitor_has_error(mon));
-        if (data) {
-            cmd->user_print(mon, data);
-            qobject_decref(data);
-        }
-    } else {
+    if (cmd) {
         cmd->mhandler.cmd(mon, qdict);
     }
 
-out:
     QDECREF(qdict);
 }
 
-- 
1.9.3

[Qemu-devel] [PATCH v3 09/21] monitor: Propagate errors through qmp_check_client_args()

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 65 ++++++++++++++++++++++++++++++++-------------------------------
 1 file changed, 33 insertions(+), 32 deletions(-)

diff --git a/monitor.c b/monitor.c
index 9403c2c..0afcf60 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4736,8 +4736,9 @@ static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd)
  *               the QMP_ACCEPT_UNKNOWNS flag is set, then the
  *               checking is skipped for it.
  */
-static int check_client_args_type(const QDict *client_args,
-                                  const QDict *cmd_args, int flags)
+static void check_client_args_type(const QDict *client_args,
+                                   const QDict *cmd_args, int flags,
+                                   Error **errp)
 {
     const QDictEntry *ent;
 
@@ -4754,8 +4755,8 @@ static int check_client_args_type(const QDict *client_args,
                 continue;
             }
             /* client arg doesn't exist */
-            qerror_report(QERR_INVALID_PARAMETER, client_arg_name);
-            return -1;
+            error_set(errp, QERR_INVALID_PARAMETER, client_arg_name);
+            return;
         }
 
         arg_type = qobject_to_qstring(obj);
@@ -4767,9 +4768,9 @@ static int check_client_args_type(const QDict *client_args,
         case 'B':
         case 's':
             if (qobject_type(client_arg) != QTYPE_QSTRING) {
-                qerror_report(QERR_INVALID_PARAMETER_TYPE, client_arg_name,
-                              "string");
-                return -1;
+                error_set(errp, QERR_INVALID_PARAMETER_TYPE,
+                          client_arg_name, "string");
+                return;
             }
         break;
         case 'i':
@@ -4777,25 +4778,25 @@ static int check_client_args_type(const QDict *client_args,
         case 'M':
         case 'o':
             if (qobject_type(client_arg) != QTYPE_QINT) {
-                qerror_report(QERR_INVALID_PARAMETER_TYPE, client_arg_name,
-                              "int");
-                return -1; 
+                error_set(errp, QERR_INVALID_PARAMETER_TYPE,
+                          client_arg_name, "int");
+                return;
             }
             break;
         case 'T':
             if (qobject_type(client_arg) != QTYPE_QINT &&
                 qobject_type(client_arg) != QTYPE_QFLOAT) {
-                qerror_report(QERR_INVALID_PARAMETER_TYPE, client_arg_name,
-                              "number");
-               return -1; 
+                error_set(errp, QERR_INVALID_PARAMETER_TYPE,
+                          client_arg_name, "number");
+                return;
             }
             break;
         case 'b':
         case '-':
             if (qobject_type(client_arg) != QTYPE_QBOOL) {
-                qerror_report(QERR_INVALID_PARAMETER_TYPE, client_arg_name,
-                              "bool");
-               return -1; 
+                error_set(errp, QERR_INVALID_PARAMETER_TYPE,
+                          client_arg_name, "bool");
+                return;
             }
             break;
         case 'O':
@@ -4814,16 +4815,15 @@ static int check_client_args_type(const QDict *client_args,
             abort();
         }
     }
-
-    return 0;
 }
 
 /*
  * - Check if the client has passed all mandatory args
  * - Set special flags for argument validation
  */
-static int check_mandatory_args(const QDict *cmd_args,
-                                const QDict *client_args, int *flags)
+static void check_mandatory_args(const QDict *cmd_args,
+                                 const QDict *client_args, int *flags,
+                                 Error **errp)
 {
     const QDictEntry *ent;
 
@@ -4838,12 +4838,10 @@ static int check_mandatory_args(const QDict *cmd_args,
         } else if (qstring_get_str(type)[0] != '-' &&
                    qstring_get_str(type)[1] != '?' &&
                    !qdict_haskey(client_args, cmd_arg_name)) {
-            qerror_report(QERR_MISSING_PARAMETER, cmd_arg_name);
-            return -1;
+            error_set(errp, QERR_MISSING_PARAMETER, cmd_arg_name);
+            return;
         }
     }
-
-    return 0;
 }
 
 static QDict *qdict_from_args_type(const char *args_type)
@@ -4899,24 +4897,26 @@ out:
  * 3. Each argument provided by the client must have the type expected
  *    by the command
  */
-static int qmp_check_client_args(const mon_cmd_t *cmd, QDict *client_args)
+static void qmp_check_client_args(const mon_cmd_t *cmd, QDict *client_args,
+                                  Error **errp)
 {
-    int flags, err;
+    Error *err = NULL;
+    int flags;
     QDict *cmd_args;
 
     cmd_args = qdict_from_args_type(cmd->args_type);
 
     flags = 0;
-    err = check_mandatory_args(cmd_args, client_args, &flags);
+    check_mandatory_args(cmd_args, client_args, &flags, &err);
     if (err) {
         goto out;
     }
 
-    err = check_client_args_type(client_args, cmd_args, flags);
+    check_client_args_type(client_args, cmd_args, flags, &err);
 
 out:
+    error_propagate(errp, err);
     QDECREF(cmd_args);
-    return err;
 }
 
 /*
@@ -4975,7 +4975,7 @@ static QDict *qmp_check_input_obj(QObject *input_obj)
 
 static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
 {
-    int err;
+    Error *local_err = NULL;
     QObject *obj, *data;
     QDict *input, *args;
     const mon_cmd_t *cmd;
@@ -5021,8 +5021,9 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         QINCREF(args);
     }
 
-    err = qmp_check_client_args(cmd, args);
-    if (err < 0) {
+    qmp_check_client_args(cmd, args, &local_err);
+    if (local_err) {
+        qerror_report_err(local_err);
         goto err_out;
     }
 
-- 
1.9.3

[Qemu-devel] [PATCH v3 10/21] monitor: Propagate errors through qmp_check_input_obj()

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

diff --git a/monitor.c b/monitor.c
index 0afcf60..61ea346 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4929,14 +4929,14 @@ out:
  * 5. If the "id" key exists, it can be anything (ie. json-value)
  * 6. Any argument not listed above is considered invalid
  */
-static QDict *qmp_check_input_obj(QObject *input_obj)
+static QDict *qmp_check_input_obj(QObject *input_obj, Error **errp)
 {
     const QDictEntry *ent;
     int has_exec_key = 0;
     QDict *input_dict;
 
     if (qobject_type(input_obj) != QTYPE_QDICT) {
-        qerror_report(QERR_QMP_BAD_INPUT_OBJECT, "object");
+        error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "object");
         return NULL;
     }
 
@@ -4948,25 +4948,25 @@ static QDict *qmp_check_input_obj(QObject *input_obj)
 
         if (!strcmp(arg_name, "execute")) {
             if (qobject_type(arg_obj) != QTYPE_QSTRING) {
-                qerror_report(QERR_QMP_BAD_INPUT_OBJECT_MEMBER, "execute",
-                              "string");
+                error_set(errp, QERR_QMP_BAD_INPUT_OBJECT_MEMBER,
+                          "execute", "string");
                 return NULL;
             }
             has_exec_key = 1;
         } else if (!strcmp(arg_name, "arguments")) {
             if (qobject_type(arg_obj) != QTYPE_QDICT) {
-                qerror_report(QERR_QMP_BAD_INPUT_OBJECT_MEMBER, "arguments",
-                              "object");
+                error_set(errp, QERR_QMP_BAD_INPUT_OBJECT_MEMBER,
+                          "arguments", "object");
                 return NULL;
             }
         } else {
-            qerror_report(QERR_QMP_EXTRA_MEMBER, arg_name);
+            error_set(errp, QERR_QMP_EXTRA_MEMBER, arg_name);
             return NULL;
         }
     }
 
     if (!has_exec_key) {
-        qerror_report(QERR_QMP_BAD_INPUT_OBJECT, "execute");
+        error_set(errp, QERR_QMP_BAD_INPUT_OBJECT, "execute");
         return NULL;
     }
 
@@ -4992,8 +4992,9 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         goto err_out;
     }
 
-    input = qmp_check_input_obj(obj);
+    input = qmp_check_input_obj(obj, &local_err);
     if (!input) {
+        qerror_report_err(local_err);
         qobject_decref(obj);
         goto err_out;
     }
-- 
1.9.3

[Qemu-devel] [PATCH v3 11/21] monitor: Propagate errors through invalid_qmp_mode()

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
---
 monitor.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/monitor.c b/monitor.c
index 61ea346..d336b8f 100644
--- a/monitor.c
+++ b/monitor.c
@@ -4708,19 +4708,20 @@ static int monitor_can_read(void *opaque)
     return (mon->suspend_cnt == 0) ? 1 : 0;
 }
 
-static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd)
+static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd,
+                             Error **errp)
 {
     bool is_cap = cmd->mhandler.cmd_new == do_qmp_capabilities;
     if (is_cap && qmp_cmd_mode(mon)) {
-        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
-                      "Capabilities negotiation is already complete, command "
-                      "'%s' ignored", cmd->name);
+        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
+                  "Capabilities negotiation is already complete, command "
+                  "'%s' ignored", cmd->name);
         return true;
     }
     if (!is_cap && !qmp_cmd_mode(mon)) {
-        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
-                      "Expecting capabilities negotiation with "
-                      "'qmp_capabilities' before command '%s'", cmd->name);
+        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
+                  "Expecting capabilities negotiation with "
+                  "'qmp_capabilities' before command '%s'", cmd->name);
         return true;
     }
     return false;
@@ -5010,7 +5011,8 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
                       "The command %s has not been found", cmd_name);
         goto err_out;
     }
-    if (invalid_qmp_mode(mon, cmd)) {
+    if (invalid_qmp_mode(mon, cmd, &local_err)) {
+        qerror_report_err(local_err);
         goto err_out;
     }
 
-- 
1.9.3

Re: [Qemu-devel] [PATCH v3 11/21] monitor: Propagate errors through invalid_qmp_mode()

[Luiz Capitulino]

On Fri, 29 May 2015 11:56:50 +0200
Markus Armbruster <armbru@redhat.com> wrote:

> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  monitor.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)
> 
> diff --git a/monitor.c b/monitor.c
> index 61ea346..d336b8f 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -4708,19 +4708,20 @@ static int monitor_can_read(void *opaque)
>      return (mon->suspend_cnt == 0) ? 1 : 0;
>  }
>  
> -static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd)
> +static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd,
> +                             Error **errp)
>  {
>      bool is_cap = cmd->mhandler.cmd_new == do_qmp_capabilities;
>      if (is_cap && qmp_cmd_mode(mon)) {
> -        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
> -                      "Capabilities negotiation is already complete, command "
> -                      "'%s' ignored", cmd->name);
> +        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
> +                  "Capabilities negotiation is already complete, command "
> +                  "'%s' ignored", cmd->name);
>          return true;
>      }
>      if (!is_cap && !qmp_cmd_mode(mon)) {
> -        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
> -                      "Expecting capabilities negotiation with "
> -                      "'qmp_capabilities' before command '%s'", cmd->name);
> +        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
> +                  "Expecting capabilities negotiation with "
> +                  "'qmp_capabilities' before command '%s'", cmd->name);
>          return true;
>      }
>      return false;
> @@ -5010,7 +5011,8 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
>                        "The command %s has not been found", cmd_name);
>          goto err_out;
>      }
> -    if (invalid_qmp_mode(mon, cmd)) {
> +    if (invalid_qmp_mode(mon, cmd, &local_err)) {
> +        qerror_report_err(local_err);

I don't think you need to call qerror_report_err() here, and you could
have changed invalid_qmp_mode() to return void. You can make those changes
before applying if you choose to do them:

Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>

>          goto err_out;
>      }
>  

Re: [Qemu-devel] [PATCH v3 11/21] monitor: Propagate errors through invalid_qmp_mode()

[Markus Armbruster]

Luiz Capitulino <lcapitulino@redhat.com> writes:

> On Fri, 29 May 2015 11:56:50 +0200
> Markus Armbruster <armbru@redhat.com> wrote:
>
>> Signed-off-by: Markus Armbruster <armbru@redhat.com>
>> ---
>>  monitor.c | 18 ++++++++++--------
>>  1 file changed, 10 insertions(+), 8 deletions(-)
>> 
>> diff --git a/monitor.c b/monitor.c
>> index 61ea346..d336b8f 100644
>> --- a/monitor.c
>> +++ b/monitor.c
>> @@ -4708,19 +4708,20 @@ static int monitor_can_read(void *opaque)
>>      return (mon->suspend_cnt == 0) ? 1 : 0;
>>  }
>>  
>> -static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd)
>> +static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd,
>> +                             Error **errp)
>>  {
>>      bool is_cap = cmd->mhandler.cmd_new == do_qmp_capabilities;
>>      if (is_cap && qmp_cmd_mode(mon)) {
>> -        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
>> -                      "Capabilities negotiation is already complete, command "
>> -                      "'%s' ignored", cmd->name);
>> +        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
>> +                  "Capabilities negotiation is already complete, command "
>> +                  "'%s' ignored", cmd->name);
>>          return true;
>>      }
>>      if (!is_cap && !qmp_cmd_mode(mon)) {
>> -        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
>> -                      "Expecting capabilities negotiation with "
>> -                      "'qmp_capabilities' before command '%s'", cmd->name);
>> +        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
>> +                  "Expecting capabilities negotiation with "
>> +                  "'qmp_capabilities' before command '%s'", cmd->name);
>>          return true;
>>      }
>>      return false;
>> @@ -5010,7 +5011,8 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
>>                        "The command %s has not been found", cmd_name);
>>          goto err_out;
>>      }
>> -    if (invalid_qmp_mode(mon, cmd)) {
>> +    if (invalid_qmp_mode(mon, cmd, &local_err)) {
>> +        qerror_report_err(local_err);
>
> I don't think you need to call qerror_report_err() here, and you could
> have changed invalid_qmp_mode() to return void. You can make those changes
> before applying if you choose to do them:

Actually, I have to call it here, because after this patch, we still
have monitor_protocol_emitter() getting the error from mon->error, so we
still have to put it there.

However, I forgot to drop it along with the other calls in PATCH 14!

> Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>

Thanks!

>>          goto err_out;
>>      }
>>  

Re: [Qemu-devel] [PATCH v3 11/21] monitor: Propagate errors through invalid_qmp_mode()

[Luiz Capitulino]

On Fri, 29 May 2015 16:19:28 +0200
Markus Armbruster <armbru@redhat.com> wrote:

> Luiz Capitulino <lcapitulino@redhat.com> writes:
> 
> > On Fri, 29 May 2015 11:56:50 +0200
> > Markus Armbruster <armbru@redhat.com> wrote:
> >
> >> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> >> ---
> >>  monitor.c | 18 ++++++++++--------
> >>  1 file changed, 10 insertions(+), 8 deletions(-)
> >> 
> >> diff --git a/monitor.c b/monitor.c
> >> index 61ea346..d336b8f 100644
> >> --- a/monitor.c
> >> +++ b/monitor.c
> >> @@ -4708,19 +4708,20 @@ static int monitor_can_read(void *opaque)
> >>      return (mon->suspend_cnt == 0) ? 1 : 0;
> >>  }
> >>  
> >> -static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd)
> >> +static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd,
> >> +                             Error **errp)
> >>  {
> >>      bool is_cap = cmd->mhandler.cmd_new == do_qmp_capabilities;
> >>      if (is_cap && qmp_cmd_mode(mon)) {
> >> -        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
> >> -                      "Capabilities negotiation is already complete, command "
> >> -                      "'%s' ignored", cmd->name);
> >> +        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
> >> +                  "Capabilities negotiation is already complete, command "
> >> +                  "'%s' ignored", cmd->name);
> >>          return true;
> >>      }
> >>      if (!is_cap && !qmp_cmd_mode(mon)) {
> >> -        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
> >> -                      "Expecting capabilities negotiation with "
> >> -                      "'qmp_capabilities' before command '%s'", cmd->name);
> >> +        error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
> >> +                  "Expecting capabilities negotiation with "
> >> +                  "'qmp_capabilities' before command '%s'", cmd->name);
> >>          return true;
> >>      }
> >>      return false;
> >> @@ -5010,7 +5011,8 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
> >>                        "The command %s has not been found", cmd_name);
> >>          goto err_out;
> >>      }
> >> -    if (invalid_qmp_mode(mon, cmd)) {
> >> +    if (invalid_qmp_mode(mon, cmd, &local_err)) {
> >> +        qerror_report_err(local_err);
> >
> > I don't think you need to call qerror_report_err() here, and you could
> > have changed invalid_qmp_mode() to return void. You can make those changes
> > before applying if you choose to do them:
> 
> Actually, I have to call it here, because after this patch, we still
> have monitor_protocol_emitter() getting the error from mon->error, so we
> still have to put it there.

You're right!

> However, I forgot to drop it along with the other calls in PATCH 14!

You don't have to respin because of that, feel free to fix it when
applying.

> 
> > Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
> 
> Thanks!
> 
> >>          goto err_out;
> >>      }
> >>  
> 

Re: [Qemu-devel] [PATCH v3 11/21] monitor: Propagate errors through invalid_qmp_mode()

[Eric Blake]

[-- Attachment #1: Type: text/plain, Size: 362 bytes --]

On 05/29/2015 03:56 AM, Markus Armbruster wrote:
> Signed-off-by: Markus Armbruster <armbru@redhat.com>
> ---
>  monitor.c | 18 ++++++++++--------
>  1 file changed, 10 insertions(+), 8 deletions(-)

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

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org


[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 604 bytes --]

[Qemu-devel] [PATCH v3 12/21] monitor: Wean monitor_protocol_emitter() off mon->error

[Markus Armbruster]

Move mon->error handling to its caller handle_qmp_command().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/monitor.c b/monitor.c
index d336b8f..56564d5 100644
--- a/monitor.c
+++ b/monitor.c
@@ -407,13 +407,14 @@ static QDict *build_qmp_error_dict(const QError *err)
     return qobject_to_qdict(obj);
 }
 
-static void monitor_protocol_emitter(Monitor *mon, QObject *data)
+static void monitor_protocol_emitter(Monitor *mon, QObject *data,
+                                     QError *err)
 {
     QDict *qmp;
 
     trace_monitor_protocol_emitter(mon);
 
-    if (!monitor_has_error(mon)) {
+    if (!err) {
         /* success response */
         qmp = qdict_new();
         if (data) {
@@ -425,9 +426,7 @@ static void monitor_protocol_emitter(Monitor *mon, QObject *data)
         }
     } else {
         /* error response */
-        qmp = build_qmp_error_dict(mon->error);
-        QDECREF(mon->error);
-        mon->error = NULL;
+        qmp = build_qmp_error_dict(err);
     }
 
     if (mon->mc->id) {
@@ -5039,8 +5038,10 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
     }
 
 err_out:
-    monitor_protocol_emitter(mon, data);
+    monitor_protocol_emitter(mon, data, mon->error);
     qobject_decref(data);
+    QDECREF(mon->error);
+    mon->error = NULL;
     QDECREF(input);
     QDECREF(args);
 }
-- 
1.9.3

[Qemu-devel] [PATCH v3 13/21] monitor: Inline monitor_has_error() into its only caller

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/monitor.c b/monitor.c
index 56564d5..91f8a4e 100644
--- a/monitor.c
+++ b/monitor.c
@@ -377,11 +377,6 @@ static int GCC_FMT_ATTR(2, 3) monitor_fprintf(FILE *stream,
     return 0;
 }
 
-static inline int monitor_has_error(const Monitor *mon)
-{
-    return mon->error != NULL;
-}
-
 static void monitor_json_emitter(Monitor *mon, const QObject *data)
 {
     QString *json;
@@ -5031,7 +5026,7 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
 
     if (cmd->mhandler.cmd_new(mon, args, &data)) {
         /* Command failed... */
-        if (!monitor_has_error(mon)) {
+        if (!mon->error) {
             /* ... without setting an error, so make one up */
             qerror_report(QERR_UNDEFINED_ERROR);
         }
-- 
1.9.3

[Qemu-devel] [PATCH v3 14/21] monitor: Limit QError use to command handlers

[Markus Armbruster]

The previous commits narrowed use of QError to handle_qmp_command()
and its helpers monitor_protocol_emitter(), build_qmp_error_dict().
Narrow it further to just the command handler call: instead of
converting Error to QError throughout handle_qmp_command(), convert
the QError gotten from the command handler to Error, and switch the
helpers from QError to Error.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 26 ++++++++++++++------------
 1 file changed, 14 insertions(+), 12 deletions(-)

diff --git a/monitor.c b/monitor.c
index 91f8a4e..16bd567 100644
--- a/monitor.c
+++ b/monitor.c
@@ -391,19 +391,19 @@ static void monitor_json_emitter(Monitor *mon, const QObject *data)
     QDECREF(json);
 }
 
-static QDict *build_qmp_error_dict(const QError *err)
+static QDict *build_qmp_error_dict(Error *err)
 {
     QObject *obj;
 
-    obj = qobject_from_jsonf("{ 'error': { 'class': %s, 'desc': %p } }",
-                             ErrorClass_lookup[err->err_class],
-                             qerror_human(err));
+    obj = qobject_from_jsonf("{ 'error': { 'class': %s, 'desc': %s } }",
+                             ErrorClass_lookup[error_get_class(err)],
+                             error_get_pretty(err));
 
     return qobject_to_qdict(obj);
 }
 
 static void monitor_protocol_emitter(Monitor *mon, QObject *data,
-                                     QError *err)
+                                     Error *err)
 {
     QDict *qmp;
 
@@ -4983,13 +4983,12 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
     obj = json_parser_parse(tokens, NULL);
     if (!obj) {
         // FIXME: should be triggered in json_parser_parse()
-        qerror_report(QERR_JSON_PARSING);
+        error_set(&local_err, QERR_JSON_PARSING);
         goto err_out;
     }
 
     input = qmp_check_input_obj(obj, &local_err);
     if (!input) {
-        qerror_report_err(local_err);
         qobject_decref(obj);
         goto err_out;
     }
@@ -5001,8 +5000,8 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
     trace_handle_qmp_command(mon, cmd_name);
     cmd = qmp_find_cmd(cmd_name);
     if (!cmd) {
-        qerror_report(ERROR_CLASS_COMMAND_NOT_FOUND,
-                      "The command %s has not been found", cmd_name);
+        error_set(&local_err, ERROR_CLASS_COMMAND_NOT_FOUND,
+                  "The command %s has not been found", cmd_name);
         goto err_out;
     }
     if (invalid_qmp_mode(mon, cmd, &local_err)) {
@@ -5020,7 +5019,6 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
 
     qmp_check_client_args(cmd, args, &local_err);
     if (local_err) {
-        qerror_report_err(local_err);
         goto err_out;
     }
 
@@ -5028,12 +5026,16 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         /* Command failed... */
         if (!mon->error) {
             /* ... without setting an error, so make one up */
-            qerror_report(QERR_UNDEFINED_ERROR);
+            error_set(&local_err, QERR_UNDEFINED_ERROR);
         }
     }
+    if (mon->error) {
+        error_set(&local_err, mon->error->err_class, "%s",
+                  mon->error->err_msg);
+    }
 
 err_out:
-    monitor_protocol_emitter(mon, data, mon->error);
+    monitor_protocol_emitter(mon, data, local_err);
     qobject_decref(data);
     QDECREF(mon->error);
     mon->error = NULL;
-- 
1.9.3

Re: [Qemu-devel] [PATCH v3 14/21] monitor: Limit QError use to command handlers

[Markus Armbruster]

The following hunk needs to be squashed in:

diff --git a/monitor.c b/monitor.c
index 16bd567..888d771 100644
--- a/monitor.c
+++ b/monitor.c
@@ -5005,7 +5005,6 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         goto err_out;
     }
     if (invalid_qmp_mode(mon, cmd, &local_err)) {
-        qerror_report_err(local_err);
         goto err_out;
     }
 

Re: [Qemu-devel] [PATCH v3 14/21] monitor: Limit QError use to command handlers

[Luiz Capitulino]

On Fri, 29 May 2015 16:23:55 +0200
Markus Armbruster <armbru@redhat.com> wrote:

> The following hunk needs to be squashed in:
> 
> diff --git a/monitor.c b/monitor.c
> index 16bd567..888d771 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -5005,7 +5005,6 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
>          goto err_out;
>      }
>      if (invalid_qmp_mode(mon, cmd, &local_err)) {
> -        qerror_report_err(local_err);
>          goto err_out;
>      }

Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>

>  
> 

[Qemu-devel] [PATCH v3 15/21] monitor: Rename handle_user_command() to handle_hmp_command()

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/monitor.c b/monitor.c
index 16bd567..ac7d851 100644
--- a/monitor.c
+++ b/monitor.c
@@ -574,7 +574,7 @@ static int do_qmp_capabilities(Monitor *mon, const QDict *params,
     return 0;
 }
 
-static void handle_user_command(Monitor *mon, const char *cmdline);
+static void handle_hmp_command(Monitor *mon, const char *cmdline);
 
 static void monitor_data_init(Monitor *mon)
 {
@@ -613,7 +613,7 @@ char *qmp_human_monitor_command(const char *command_line, bool has_cpu_index,
         }
     }
 
-    handle_user_command(&hmp, command_line);
+    handle_hmp_command(&hmp, command_line);
     cur_mon = old_mon;
 
     qemu_mutex_lock(&hmp.out_lock);
@@ -4025,7 +4025,7 @@ void monitor_set_error(Monitor *mon, QError *qerror)
     }
 }
 
-static void handle_user_command(Monitor *mon, const char *cmdline)
+static void handle_hmp_command(Monitor *mon, const char *cmdline)
 {
     QDict *qdict;
     const mon_cmd_t *cmd;
@@ -5071,7 +5071,7 @@ static void monitor_read(void *opaque, const uint8_t *buf, int size)
         if (size == 0 || buf[size - 1] != 0)
             monitor_printf(cur_mon, "corrupted command\n");
         else
-            handle_user_command(cur_mon, (char *)buf);
+            handle_hmp_command(cur_mon, (char *)buf);
     }
 
     cur_mon = old_mon;
@@ -5083,7 +5083,7 @@ static void monitor_command_cb(void *opaque, const char *cmdline,
     Monitor *mon = opaque;
 
     monitor_suspend(mon);
-    handle_user_command(mon, cmdline);
+    handle_hmp_command(mon, cmdline);
     monitor_resume(mon);
 }
 
-- 
1.9.3

[Qemu-devel] [PATCH v3 16/21] monitor: Rename monitor_control_read(), monitor_control_event()

[Markus Armbruster]

... to monitor_qmp_read(), monitor_qmp_event().

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)

diff --git a/monitor.c b/monitor.c
index ac7d851..cf80d10 100644
--- a/monitor.c
+++ b/monitor.c
@@ -5043,10 +5043,7 @@ err_out:
     QDECREF(args);
 }
 
-/**
- * monitor_control_read(): Read and handle QMP input
- */
-static void monitor_control_read(void *opaque, const uint8_t *buf, int size)
+static void monitor_qmp_read(void *opaque, const uint8_t *buf, int size)
 {
     Monitor *old_mon = cur_mon;
 
@@ -5111,10 +5108,7 @@ static QObject *get_qmp_greeting(void)
     return qobject_from_jsonf("{'QMP':{'version': %p,'capabilities': []}}",ver);
 }
 
-/**
- * monitor_control_event(): Print QMP gretting
- */
-static void monitor_control_event(void *opaque, int event)
+static void monitor_qmp_event(void *opaque, int event)
 {
     QObject *data;
     Monitor *mon = opaque;
@@ -5264,8 +5258,8 @@ void monitor_init(CharDriverState *chr, int flags)
     if (monitor_ctrl_mode(mon)) {
         mon->mc = g_malloc0(sizeof(MonitorControl));
         /* Control mode requires special handlers */
-        qemu_chr_add_handlers(chr, monitor_can_read, monitor_control_read,
-                              monitor_control_event, mon);
+        qemu_chr_add_handlers(chr, monitor_can_read, monitor_qmp_read,
+                              monitor_qmp_event, mon);
         qemu_chr_fe_set_echo(chr, true);
 
         json_message_parser_init(&mon->mc->parser, handle_qmp_command);
-- 
1.9.3

[Qemu-devel] [PATCH v3 17/21] monitor: Unbox Monitor member mc and rename to qmp

[Markus Armbruster]

While there, rename its type as well, from MonitorControl to
MonitorQMP.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 33 +++++++++++++++------------------
 1 file changed, 15 insertions(+), 18 deletions(-)

diff --git a/monitor.c b/monitor.c
index cf80d10..187ccdb 100644
--- a/monitor.c
+++ b/monitor.c
@@ -161,11 +161,11 @@ struct MonFdset {
     QLIST_ENTRY(MonFdset) next;
 };
 
-typedef struct MonitorControl {
+typedef struct {
     QObject *id;
     JSONMessageParser parser;
     int command_mode;
-} MonitorControl;
+} MonitorQMP;
 
 /*
  * To prevent flooding clients, events can be throttled. The
@@ -195,7 +195,7 @@ struct Monitor {
     int mux_out;
 
     ReadLineState *rs;
-    MonitorControl *mc;
+    MonitorQMP qmp;
     CPUState *mon_cpu;
     BlockCompletionFunc *password_completion_cb;
     void *password_opaque;
@@ -228,7 +228,7 @@ static void monitor_command_cb(void *opaque, const char *cmdline,
 
 static inline int qmp_cmd_mode(const Monitor *mon)
 {
-    return (mon->mc ? mon->mc->command_mode : 0);
+    return mon->qmp.command_mode;
 }
 
 /* Return true if in control mode, false otherwise */
@@ -424,9 +424,9 @@ static void monitor_protocol_emitter(Monitor *mon, QObject *data,
         qmp = build_qmp_error_dict(err);
     }
 
-    if (mon->mc->id) {
-        qdict_put_obj(qmp, "id", mon->mc->id);
-        mon->mc->id = NULL;
+    if (mon->qmp.id) {
+        qdict_put_obj(qmp, "id", mon->qmp.id);
+        mon->qmp.id = NULL;
     }
 
     monitor_json_emitter(mon, QOBJECT(qmp));
@@ -568,7 +568,7 @@ static int do_qmp_capabilities(Monitor *mon, const QDict *params,
 {
     /* Will setup QMP capabilities in the future */
     if (monitor_ctrl_mode(mon)) {
-        mon->mc->command_mode = 1;
+        mon->qmp.command_mode = 1;
     }
 
     return 0;
@@ -4993,8 +4993,8 @@ static void handle_qmp_command(JSONMessageParser *parser, QList *tokens)
         goto err_out;
     }
 
-    mon->mc->id = qdict_get(input, "id");
-    qobject_incref(mon->mc->id);
+    mon->qmp.id = qdict_get(input, "id");
+    qobject_incref(mon->qmp.id);
 
     cmd_name = qdict_get_str(input, "execute");
     trace_handle_qmp_command(mon, cmd_name);
@@ -5049,7 +5049,7 @@ static void monitor_qmp_read(void *opaque, const uint8_t *buf, int size)
 
     cur_mon = opaque;
 
-    json_message_parser_feed(&cur_mon->mc->parser, (const char *) buf, size);
+    json_message_parser_feed(&cur_mon->qmp.parser, (const char *) buf, size);
 
     cur_mon = old_mon;
 }
@@ -5115,15 +5115,15 @@ static void monitor_qmp_event(void *opaque, int event)
 
     switch (event) {
     case CHR_EVENT_OPENED:
-        mon->mc->command_mode = 0;
+        mon->qmp.command_mode = 0;
         data = get_qmp_greeting();
         monitor_json_emitter(mon, data);
         qobject_decref(data);
         mon_refcount++;
         break;
     case CHR_EVENT_CLOSED:
-        json_message_parser_destroy(&mon->mc->parser);
-        json_message_parser_init(&mon->mc->parser, handle_qmp_command);
+        json_message_parser_destroy(&mon->qmp.parser);
+        json_message_parser_init(&mon->qmp.parser, handle_qmp_command);
         mon_refcount--;
         monitor_fdsets_cleanup();
         break;
@@ -5256,13 +5256,10 @@ void monitor_init(CharDriverState *chr, int flags)
     }
 
     if (monitor_ctrl_mode(mon)) {
-        mon->mc = g_malloc0(sizeof(MonitorControl));
-        /* Control mode requires special handlers */
         qemu_chr_add_handlers(chr, monitor_can_read, monitor_qmp_read,
                               monitor_qmp_event, mon);
         qemu_chr_fe_set_echo(chr, true);
-
-        json_message_parser_init(&mon->mc->parser, handle_qmp_command);
+        json_message_parser_init(&mon->qmp.parser, handle_qmp_command);
     } else {
         qemu_chr_add_handlers(chr, monitor_can_read, monitor_read,
                               monitor_event, mon);
-- 
1.9.3

[Qemu-devel] [PATCH v3 18/21] monitor: Drop do_qmp_capabilities()'s superfluous QMP check

[Markus Armbruster]

Superfluous since commit 30f5041 removed it from HMP.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/monitor.c b/monitor.c
index 187ccdb..d01d270 100644
--- a/monitor.c
+++ b/monitor.c
@@ -566,11 +566,7 @@ static void monitor_qapi_event_init(void)
 static int do_qmp_capabilities(Monitor *mon, const QDict *params,
                                QObject **ret_data)
 {
-    /* Will setup QMP capabilities in the future */
-    if (monitor_ctrl_mode(mon)) {
-        mon->qmp.command_mode = 1;
-    }
-
+    mon->qmp.command_mode = 1;
     return 0;
 }
 
-- 
1.9.3

[Qemu-devel] [PATCH v3 19/21] monitor: Turn int command_mode into bool in_command_mode

[Markus Armbruster]

While there, inline the pointless qmp_cmd_mode() wrapper.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 23 ++++++++++++-----------
 1 file changed, 12 insertions(+), 11 deletions(-)

diff --git a/monitor.c b/monitor.c
index d01d270..75ae035 100644
--- a/monitor.c
+++ b/monitor.c
@@ -164,7 +164,12 @@ struct MonFdset {
 typedef struct {
     QObject *id;
     JSONMessageParser parser;
-    int command_mode;
+    /*
+     * When a client connects, we're in capabilities negotiation mode.
+     * When command qmp_capabilities succeeds, we go into command
+     * mode.
+     */
+    bool in_command_mode;       /* are we in command mode? */
 } MonitorQMP;
 
 /*
@@ -226,11 +231,6 @@ Monitor *default_mon;
 static void monitor_command_cb(void *opaque, const char *cmdline,
                                void *readline_opaque);
 
-static inline int qmp_cmd_mode(const Monitor *mon)
-{
-    return mon->qmp.command_mode;
-}
-
 /* Return true if in control mode, false otherwise */
 static inline int monitor_ctrl_mode(const Monitor *mon)
 {
@@ -446,7 +446,7 @@ static void monitor_qapi_event_emit(QAPIEvent event, QObject *data)
 
     trace_monitor_protocol_event_emit(event, data);
     QLIST_FOREACH(mon, &mon_list, entry) {
-        if (monitor_ctrl_mode(mon) && qmp_cmd_mode(mon)) {
+        if (monitor_ctrl_mode(mon) && mon->qmp.in_command_mode) {
             monitor_json_emitter(mon, data);
         }
     }
@@ -566,7 +566,7 @@ static void monitor_qapi_event_init(void)
 static int do_qmp_capabilities(Monitor *mon, const QDict *params,
                                QObject **ret_data)
 {
-    mon->qmp.command_mode = 1;
+    mon->qmp.in_command_mode = true;
     return 0;
 }
 
@@ -4702,13 +4702,14 @@ static bool invalid_qmp_mode(const Monitor *mon, const mon_cmd_t *cmd,
                              Error **errp)
 {
     bool is_cap = cmd->mhandler.cmd_new == do_qmp_capabilities;
-    if (is_cap && qmp_cmd_mode(mon)) {
+
+    if (is_cap && mon->qmp.in_command_mode) {
         error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
                   "Capabilities negotiation is already complete, command "
                   "'%s' ignored", cmd->name);
         return true;
     }
-    if (!is_cap && !qmp_cmd_mode(mon)) {
+    if (!is_cap && !mon->qmp.in_command_mode) {
         error_set(errp, ERROR_CLASS_COMMAND_NOT_FOUND,
                   "Expecting capabilities negotiation with "
                   "'qmp_capabilities' before command '%s'", cmd->name);
@@ -5111,7 +5112,7 @@ static void monitor_qmp_event(void *opaque, int event)
 
     switch (event) {
     case CHR_EVENT_OPENED:
-        mon->qmp.command_mode = 0;
+        mon->qmp.in_command_mode = false;
         data = get_qmp_greeting();
         monitor_json_emitter(mon, data);
         qobject_decref(data);
-- 
1.9.3

[Qemu-devel] [PATCH v3 20/21] monitor: Rename monitor_ctrl_mode() to monitor_is_qmp()

[Markus Armbruster]

... and change return type to bool.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 monitor.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/monitor.c b/monitor.c
index 75ae035..3426bdc 100644
--- a/monitor.c
+++ b/monitor.c
@@ -231,8 +231,10 @@ Monitor *default_mon;
 static void monitor_command_cb(void *opaque, const char *cmdline,
                                void *readline_opaque);
 
-/* Return true if in control mode, false otherwise */
-static inline int monitor_ctrl_mode(const Monitor *mon)
+/**
+ * Is @mon a QMP monitor?
+ */
+static inline bool monitor_is_qmp(const Monitor *mon)
 {
     return (mon->flags & MONITOR_USE_CONTROL);
 }
@@ -240,7 +242,7 @@ static inline int monitor_ctrl_mode(const Monitor *mon)
 /* Return non-zero iff we have a current monitor, and it is in QMP mode.  */
 int monitor_cur_is_qmp(void)
 {
-    return cur_mon && monitor_ctrl_mode(cur_mon);
+    return cur_mon && monitor_is_qmp(cur_mon);
 }
 
 void monitor_read_command(Monitor *mon, int show_prompt)
@@ -350,7 +352,7 @@ void monitor_vprintf(Monitor *mon, const char *fmt, va_list ap)
     if (!mon)
         return;
 
-    if (monitor_ctrl_mode(mon)) {
+    if (monitor_is_qmp(mon)) {
         return;
     }
 
@@ -446,7 +448,7 @@ static void monitor_qapi_event_emit(QAPIEvent event, QObject *data)
 
     trace_monitor_protocol_event_emit(event, data);
     QLIST_FOREACH(mon, &mon_list, entry) {
-        if (monitor_ctrl_mode(mon) && mon->qmp.in_command_mode) {
+        if (monitor_is_qmp(mon) && mon->qmp.in_command_mode) {
             monitor_json_emitter(mon, data);
         }
     }
@@ -5252,7 +5254,7 @@ void monitor_init(CharDriverState *chr, int flags)
         monitor_read_command(mon, 0);
     }
 
-    if (monitor_ctrl_mode(mon)) {
+    if (monitor_is_qmp(mon)) {
         qemu_chr_add_handlers(chr, monitor_can_read, monitor_qmp_read,
                               monitor_qmp_event, mon);
         qemu_chr_fe_set_echo(chr, true);
-- 
1.9.3

[Qemu-devel] [PATCH v3 21/21] monitor: Change return type of monitor_cur_is_qmp() to bool

[Markus Armbruster]

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Luiz Capitulino <lcapitulino@redhat.com>
---
 include/monitor/monitor.h | 2 +-
 monitor.c                 | 6 ++++--
 stubs/mon-is-qmp.c        | 4 ++--
 3 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/include/monitor/monitor.h b/include/monitor/monitor.h
index d409b6a..57f8394 100644
--- a/include/monitor/monitor.h
+++ b/include/monitor/monitor.h
@@ -16,7 +16,7 @@ extern Monitor *default_mon;
 #define MONITOR_USE_CONTROL   0x04
 #define MONITOR_USE_PRETTY    0x08
 
-int monitor_cur_is_qmp(void);
+bool monitor_cur_is_qmp(void);
 
 void monitor_init(CharDriverState *chr, int flags);
 
diff --git a/monitor.c b/monitor.c
index 3426bdc..766032c 100644
--- a/monitor.c
+++ b/monitor.c
@@ -239,8 +239,10 @@ static inline bool monitor_is_qmp(const Monitor *mon)
     return (mon->flags & MONITOR_USE_CONTROL);
 }
 
-/* Return non-zero iff we have a current monitor, and it is in QMP mode.  */
-int monitor_cur_is_qmp(void)
+/**
+ * Is the current monitor, if any, a QMP monitor?
+ */
+bool monitor_cur_is_qmp(void)
 {
     return cur_mon && monitor_is_qmp(cur_mon);
 }
diff --git a/stubs/mon-is-qmp.c b/stubs/mon-is-qmp.c
index 1f0a8fd..1ef136a 100644
--- a/stubs/mon-is-qmp.c
+++ b/stubs/mon-is-qmp.c
@@ -1,7 +1,7 @@
 #include "qemu-common.h"
 #include "monitor/monitor.h"
 
-int monitor_cur_is_qmp(void)
+bool monitor_cur_is_qmp(void)
 {
-    return 0;
+    return false;
 }
-- 
1.9.3