HMP pull 2018-06-21

Minor fixes and reenable preconfig
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Merge remote-tracking branch 'remotes/dgilbert/tags/pull-hmp-20180621' into staging

HMP pull 2018-06-21

Minor fixes and reenable preconfig

# gpg: Signature made Thu 21 Jun 2018 17:43:09 BST
# gpg:                using RSA key 0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A  9FA9 0516 331E BC5B FDE7

* remotes/dgilbert/tags/pull-hmp-20180621:
  hmp: Allow HMP in preconfig state again
  hmp: add exit_preconfig
  hmp: Add commands for preconfig
  qmp: Enable a few commands in preconfig state
  hmp: Restrict auto-complete in preconfig
  hmp: Allow help on preconfig commands
  hmp: Add flag for preconfig commands
  hmp-commands: use long for begin and length in dump-guest-memory
  monitor: report entirety of hmp command on error

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

hmp-commands-info.hx

@@ -19,6 +19,7 @@ ETEXI
         .params     = "",
         .help       = "show the version of QEMU",
         .cmd        = hmp_info_version,
+        .flags      = "p",
     },
 
 STEXI
@@ -47,6 +48,7 @@ ETEXI
         .params     = "",
         .help       = "show the character devices",
         .cmd        = hmp_info_chardev,
+        .flags      = "p",
     },
 
 STEXI
@@ -165,6 +167,7 @@ ETEXI
         .params     = "",
         .help       = "show the command line history",
         .cmd        = hmp_info_history,
+        .flags      = "p",
     },
 
 STEXI
@@ -399,6 +402,7 @@ ETEXI
         .params     = "",
         .help       = "show the current VM status (running|paused)",
         .cmd        = hmp_info_status,
+        .flags      = "p",
     },
 
 STEXI
@@ -457,6 +461,7 @@ ETEXI
         .params     = "",
         .help       = "show the current VM name",
         .cmd        = hmp_info_name,
+        .flags      = "p",
     },
 
 STEXI
@@ -471,6 +476,7 @@ ETEXI
         .params     = "",
         .help       = "show the current VM UUID",
         .cmd        = hmp_info_uuid,
+        .flags      = "p",
     },
 
 STEXI
@@ -613,6 +619,7 @@ ETEXI
         .params     = "[path]",
         .help       = "show QOM composition tree",
         .cmd        = hmp_info_qom_tree,
+        .flags      = "p",
     },
 
 STEXI
@@ -671,6 +678,7 @@ ETEXI
         .params     = "",
         .help       = "show memory backends",
         .cmd        = hmp_info_memdev,
+        .flags      = "p",
     },
 
 STEXI
@@ -699,6 +707,7 @@ ETEXI
         .params     = "",
         .help       = "show iothreads",
         .cmd        = hmp_info_iothreads,
+        .flags      = "p",
     },
 
 STEXI
@@ -829,6 +838,7 @@ ETEXI
         .params     = "",
         .help       = "Show information about hotpluggable CPUs",
         .cmd        = hmp_hotpluggable_cpus,
+        .flags      = "p",
     },
 
 STEXI

hmp-commands.hx

@@ -15,6 +15,7 @@ ETEXI
         .params     = "[cmd]",
         .help       = "show the help",
         .cmd        = do_help_cmd,
+        .flags      = "p",
     },
 
 STEXI
@@ -54,6 +55,25 @@ STEXI
 @item q or quit
 @findex quit
 Quit the emulator.
+ETEXI
+
+    {
+        .name       = "exit_preconfig",
+        .args_type  = "",
+        .params     = "",
+        .help       = "exit the preconfig state",
+        .cmd        = hmp_exit_preconfig,
+        .flags      = "p",
+    },
+
+STEXI
+@item exit_preconfig
+@findex exit_preconfig
+This command makes QEMU exit the preconfig state and proceed with
+VM initialization using configuration data provided on the command line
+and via the QMP monitor during the preconfig state. The command is only
+available during the preconfig state (i.e. when the --preconfig command
+line option was in use).
 ETEXI
 
     {
@@ -1116,7 +1136,7 @@ ETEXI
 
     {
         .name       = "dump-guest-memory",
-        .args_type  = "paging:-p,detach:-d,zlib:-z,lzo:-l,snappy:-s,filename:F,begin:i?,length:i?",
+        .args_type  = "paging:-p,detach:-d,zlib:-z,lzo:-l,snappy:-s,filename:F,begin:l?,length:l?",
         .params     = "[-p] [-d] [-z|-l|-s] filename [begin length]",
         .help       = "dump guest memory into file 'filename'.\n\t\t\t"
                       "-p: do paging to get guest's memory mapping.\n\t\t\t"
@@ -1827,6 +1847,7 @@ ETEXI
         .params     = "path",
         .help       = "list QOM properties",
         .cmd        = hmp_qom_list,
+        .flags      = "p",
     },
 
 STEXI
@@ -1840,6 +1861,7 @@ ETEXI
         .params     = "path property value",
         .help       = "set QOM property",
         .cmd        = hmp_qom_set,
+        .flags      = "p",
     },
 
 STEXI
@@ -1854,6 +1876,7 @@ ETEXI
         .help       = "show various information about the system state",
         .cmd        = hmp_info_help,
         .sub_table  = info_cmds,
+        .flags      = "p",
     },
 
 STEXI

hmp.c

@@ -1068,6 +1068,14 @@ void hmp_system_powerdown(Monitor *mon, const QDict *qdict)
     qmp_system_powerdown(NULL);
 }
 
+void hmp_exit_preconfig(Monitor *mon, const QDict *qdict)
+{
+    Error *err = NULL;
+
+    qmp_exit_preconfig(&err);
+    hmp_handle_error(mon, &err);
+}
+
 void hmp_cpu(Monitor *mon, const QDict *qdict)
 {
     int64_t cpu_index;

hmp.h

@@ -44,6 +44,7 @@ void hmp_quit(Monitor *mon, const QDict *qdict);
 void hmp_stop(Monitor *mon, const QDict *qdict);
 void hmp_system_reset(Monitor *mon, const QDict *qdict);
 void hmp_system_powerdown(Monitor *mon, const QDict *qdict);
+void hmp_exit_preconfig(Monitor *mon, const QDict *qdict);
 void hmp_cpu(Monitor *mon, const QDict *qdict);
 void hmp_memsave(Monitor *mon, const QDict *qdict);
 void hmp_pmemsave(Monitor *mon, const QDict *qdict);

monitor.c

@@ -128,6 +128,7 @@ typedef struct mon_cmd_t {
     const char *args_type;
     const char *params;
     const char *help;
+    const char *flags; /* p=preconfig */
     void (*cmd)(Monitor *mon, const QDict *qdict);
     /* @sub_table is a list of 2nd level of commands. If it does not exist,
      * cmd should be used. If it exists, sub_table[?].cmd should be
@@ -958,6 +959,19 @@ static int parse_cmdline(const char *cmdline,
     return -1;
 }
 
+/*
+ * Returns true if the command can be executed in preconfig mode
+ * i.e. it has the 'p' flag.
+ */
+static bool cmd_can_preconfig(const mon_cmd_t *cmd)
+{
+    if (!cmd->flags) {
+        return false;
+    }
+
+    return strchr(cmd->flags, 'p');
+}
+
 static void help_cmd_dump_one(Monitor *mon,
                               const mon_cmd_t *cmd,
                               char **prefix_args,
@@ -965,6 +979,10 @@ static void help_cmd_dump_one(Monitor *mon,
 {
     int i;
 
+    if (runstate_check(RUN_STATE_PRECONFIG) && !cmd_can_preconfig(cmd)) {
+        return;
+    }
+
     for (i = 0; i < prefix_args_nb; i++) {
         monitor_printf(mon, "%s ", prefix_args[i]);
     }
@@ -987,7 +1005,9 @@ static void help_cmd_dump(Monitor *mon, const mon_cmd_t *cmds,
 
     /* Find one entry to dump */
     for (cmd = cmds; cmd->name != NULL; cmd++) {
-        if (compare_cmd(args[arg_index], cmd->name)) {
+        if (compare_cmd(args[arg_index], cmd->name) &&
+            ((!runstate_check(RUN_STATE_PRECONFIG) ||
+                cmd_can_preconfig(cmd)))) {
             if (cmd->sub_table) {
                 /* continue with next arg */
                 help_cmd_dump(mon, cmd->sub_table,
@@ -3041,6 +3061,12 @@ static const mon_cmd_t *monitor_parse_command(Monitor *mon,
                        (int)(p - cmdp_start), cmdp_start);
         return NULL;
     }
+    if (runstate_check(RUN_STATE_PRECONFIG) && !cmd_can_preconfig(cmd)) {
+        monitor_printf(mon, "Command '%.*s' not available with -preconfig "
+                            "until after exit_preconfig.\n",
+                       (int)(p - cmdp_start), cmdp_start);
+        return NULL;
+    }
 
     /* filter out following useless space */
     while (qemu_isspace(*p)) {
@@ -3431,15 +3457,10 @@ static void handle_hmp_command(Monitor *mon, const char *cmdline)
 {
     QDict *qdict;
     const mon_cmd_t *cmd;
+    const char *cmd_start = cmdline;
 
     trace_handle_hmp_command(mon, cmdline);
 
-    if (runstate_check(RUN_STATE_PRECONFIG)) {
-        monitor_printf(mon, "HMP not available in preconfig state, "
-                            "use QMP instead\n");
-        return;
-    }
-
     cmd = monitor_parse_command(mon, cmdline, &cmdline, mon->cmd_table);
     if (!cmd) {
         return;
@@ -3447,8 +3468,11 @@ static void handle_hmp_command(Monitor *mon, const char *cmdline)
 
     qdict = monitor_parse_arguments(mon, &cmdline, cmd);
     if (!qdict) {
-        monitor_printf(mon, "Try \"help %s\" for more information\n",
+        while (cmdline > cmd_start && qemu_isspace(cmdline[-1])) {
-                       cmd->name);
+            cmdline--;
+        }
+        monitor_printf(mon, "Try \"help %.*s\" for more information\n",
+                       (int)(cmdline - cmd_start), cmd_start);
         return;
     }
 
@@ -3990,12 +4014,17 @@ static void monitor_find_completion_by_table(Monitor *mon,
             cmdname = args[0];
         readline_set_completion_index(mon->rs, strlen(cmdname));
         for (cmd = cmd_table; cmd->name != NULL; cmd++) {
+            if (!runstate_check(RUN_STATE_PRECONFIG) ||
+                 cmd_can_preconfig(cmd)) {
                 cmd_completion(mon, cmdname, cmd->name);
             }
+        }
     } else {
         /* find the command */
         for (cmd = cmd_table; cmd->name != NULL; cmd++) {
-            if (compare_cmd(args[0], cmd->name)) {
+            if (compare_cmd(args[0], cmd->name) &&
+                (!runstate_check(RUN_STATE_PRECONFIG) ||
+                 cmd_can_preconfig(cmd))) {
                 break;
             }
         }

qapi/char.json

@@ -62,7 +62,8 @@
 #    }
 #
 ##
-{ 'command': 'query-chardev', 'returns': ['ChardevInfo'] }
+{ 'command': 'query-chardev', 'returns': ['ChardevInfo'],
+  'allow-preconfig': true }
 
 ##
 # @ChardevBackendInfo:

qapi/misc.json

@@ -117,7 +117,8 @@
 #    }
 #
 ##
-{ 'command': 'query-version', 'returns': 'VersionInfo' }
+{ 'command': 'query-version', 'returns': 'VersionInfo',
+  'allow-preconfig': true }
 
 ##
 # @CommandInfo:
@@ -241,7 +242,7 @@
 # <- { "return": { "name": "qemu-name" } }
 #
 ##
-{ 'command': 'query-name', 'returns': 'NameInfo' }
+{ 'command': 'query-name', 'returns': 'NameInfo', 'allow-preconfig': true }
 
 ##
 # @KvmInfo:
@@ -301,7 +302,7 @@
 # <- { "return": { "UUID": "550e8400-e29b-41d4-a716-446655440000" } }
 #
 ##
-{ 'command': 'query-uuid', 'returns': 'UuidInfo' }
+{ 'command': 'query-uuid', 'returns': 'UuidInfo', 'allow-preconfig': true }
 
 ##
 # @EventInfo:
@@ -710,7 +711,8 @@
 #    }
 #
 ##
-{ 'command': 'query-iothreads', 'returns': ['IOThreadInfo'] }
+{ 'command': 'query-iothreads', 'returns': ['IOThreadInfo'],
+  'allow-preconfig': true }
 
 ##
 # @BalloonInfo:
@@ -1408,7 +1410,8 @@
 ##
 { 'command': 'qom-list',
   'data': { 'path': 'str' },
-  'returns': [ 'ObjectPropertyInfo' ] }
+  'returns': [ 'ObjectPropertyInfo' ],
+  'allow-preconfig': true }
 
 ##
 # @qom-get:
@@ -1444,7 +1447,8 @@
 ##
 { 'command': 'qom-get',
   'data': { 'path': 'str', 'property': 'str' },
-  'returns': 'any' }
+  'returns': 'any',
+  'allow-preconfig': true }
 
 ##
 # @qom-set:
@@ -1461,7 +1465,8 @@
 # Since: 1.2
 ##
 { 'command': 'qom-set',
-  'data': { 'path': 'str', 'property': 'str', 'value': 'any' } }
+  'data': { 'path': 'str', 'property': 'str', 'value': 'any' },
+  'allow-preconfig': true }
 
 ##
 # @change:
@@ -1543,7 +1548,8 @@
 ##
 { 'command': 'qom-list-types',
   'data': { '*implements': 'str', '*abstract': 'bool' },
-  'returns': [ 'ObjectTypeInfo' ] }
+  'returns': [ 'ObjectTypeInfo' ],
+  'allow-preconfig': true }
 
 ##
 # @device-list-properties:
@@ -1581,7 +1587,8 @@
 ##
 { 'command': 'qom-list-properties',
   'data': { 'typename': 'str'},
-  'returns': [ 'ObjectPropertyInfo' ] }
+  'returns': [ 'ObjectPropertyInfo' ],
+  'allow-preconfig': true }
 
 ##
 # @xen-set-global-dirty-log:
@@ -2902,7 +2909,7 @@
 #    }
 #
 ##
-{ 'command': 'query-memdev', 'returns': ['Memdev'] }
+{ 'command': 'query-memdev', 'returns': ['Memdev'], 'allow-preconfig': true }
 
 ##
 # @PCDIMMDeviceInfo: