hmp: add info iothreads command

Make "info iothreads" available on the HMP monitor.

For example, the results are as follows when executing qemu
command with "-object iothread,id=iothread-1 -object
iothread,id=iothread-2".
(qemu) info iothreads
iothread-1: thread_id=123
iothread-2: thread_id=456
Signed-off-by: NTing Wang <kathy.wangting@huawei.com>
Message-Id: <1435306033-58372-1-git-send-email-kathy.wangting@huawei.com>
Reviewed-by: NLuiz Capitulino <lcapitulino@redhat.com>
Reviewed-by: Amos Jianjun Kong <kongjianjun@gmail.com>
Signed-off-by: NMarkus Armbruster <armbru@redhat.com>

hmp-commands.hx

@@ -1809,6 +1809,8 @@ show the TPM device
 show the memory devices
 @item info skeys
 Display the value of a storage key (s390 only)
+@item info iothreads
+show iothreads
 @end table
 ETEXI
 

hmp.c

@@ -1963,6 +1963,19 @@ void hmp_info_memory_devices(Monitor *mon, const QDict *qdict)
     qapi_free_MemoryDeviceInfoList(info_list);
 }
 
+void hmp_info_iothreads(Monitor *mon, const QDict *qdict)
+{
+    IOThreadInfoList *info_list = qmp_query_iothreads(NULL);
+    IOThreadInfoList *info;
+
+    for (info = info_list; info; info = info->next) {
+        monitor_printf(mon, "%s: thread_id=%" PRId64 "\n",
+                       info->value->id, info->value->thread_id);
+    }
+
+    qapi_free_IOThreadInfoList(info_list);
+}
+
 void hmp_qom_list(Monitor *mon, const QDict *qdict)
 {
     const char *path = qdict_get_try_str(qdict, "path");

hmp.h

@@ -39,6 +39,7 @@ void hmp_info_balloon(Monitor *mon, const QDict *qdict);
 void hmp_info_pci(Monitor *mon, const QDict *qdict);
 void hmp_info_block_jobs(Monitor *mon, const QDict *qdict);
 void hmp_info_tpm(Monitor *mon, const QDict *qdict);
+void hmp_info_iothreads(Monitor *mon, const QDict *qdict);
 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);

monitor.c

@@ -2853,6 +2853,13 @@ static mon_cmd_t info_cmds[] = {
         .help       = "show memory devices",
         .mhandler.cmd = hmp_info_memory_devices,
     },
+    {
+        .name       = "iothreads",
+        .args_type  = "",
+        .params     = "",
+        .help       = "show iothreads",
+        .mhandler.cmd = hmp_info_iothreads,
+    },
     {
         .name       = "rocker",
         .args_type  = "name:s",