New QMP command query-cpu-max and HMP command cpu_max

These commands return the maximum number of CPUs supported by the
currently running emulator instance, as defined in its QEMUMachine
struct.

Signed-off-by: Michal Novotny <minovotn@redhat.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>

diff --git a/hmp-commands.hx b/hmp-commands.hx
index df44906ef94ba8da74565044bb21430d301264b7..3d98604f779fbae48fc66bf3686fb3566ec30dbe 100644 (file)
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1643,6 +1643,8 @@ show qdev device model list
 show roms
 @item info tpm
 show the TPM device
+@item info cpu_max
+show the number of CPUs supported by the machine being emulated.
 @end table
 ETEXI
 

diff --git a/hmp.c b/hmp.c
index d319897767f0751e0be289ebe6ab22b59012585b..c12c495dc4c869ea9f20ea7d75a0db8965e02926 100644 (file)
--- a/hmp.c
+++ b/hmp.c
@@ -748,6 +748,14 @@ void hmp_ringbuf_read(Monitor *mon, const QDict *qdict)
     g_free(data);
 }
 
+void hmp_query_cpu_max(Monitor *mon, const QDict *qdict)
+{
+    int cpu_max;
+
+    cpu_max = qmp_query_cpu_max(NULL);
+    monitor_printf(mon, "Maximum number of CPUs is %d\n", cpu_max);
+}
+
 static void hmp_cont_cb(void *opaque, int err)
 {
     if (!err) {

diff --git a/hmp.h b/hmp.h
index 95fe76e218f48ee6fb9ccb37768a85350deaa1e9..80e8b412d4279d88a2fb9d9f70704a6112ab856a 100644 (file)
--- a/hmp.h
+++ b/hmp.h
@@ -42,6 +42,7 @@ 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_cpu(Monitor *mon, const QDict *qdict);
+void hmp_query_cpu_max(Monitor *mon, const QDict *qdict);
 void hmp_memsave(Monitor *mon, const QDict *qdict);
 void hmp_pmemsave(Monitor *mon, const QDict *qdict);
 void hmp_ringbuf_write(Monitor *mon, const QDict *qdict);

diff --git a/monitor.c b/monitor.c
index 2d9e8878ebf6610fe38c74b3f3c2fe1258a7e56d..e450919269e1914130e193e64cc9ca9b180095e1 100644 (file)
--- a/monitor.c
+++ b/monitor.c
@@ -2745,6 +2745,13 @@ static mon_cmd_t info_cmds[] = {
         .help       = "show the TPM device",
         .mhandler.cmd = hmp_info_tpm,
     },
+    {
+        .name       = "cpu_max",
+        .args_type  = "",
+        .params     = "",
+        .help       = "Get maximum number of VCPUs supported by machine",
+        .mhandler.cmd = hmp_query_cpu_max,
+    },
     {
         .name       = NULL,
     },

diff --git a/qapi-schema.json b/qapi-schema.json
index 0d16d14e4fdf4ab7d10f6428fa52409167bd59b6..af499bd92607e5128950ac24c9ee5feb50098727 100644 (file)
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1831,6 +1831,17 @@
 ##
 { 'command': 'query-migrate-cache-size', 'returns': 'int' }
 
+##
+## @query-cpu-max
+##
+## query maximum number of CPUs supported by machine
+##
+## Returns: number of CPUs
+##
+## Since: 1.5
+###
+{ 'command': 'query-cpu-max', 'returns': 'int' }
+
 ##
 # @ObjectPropertyInfo:
 #

diff --git a/qmp-commands.hx b/qmp-commands.hx
index 3aa6bd1bd9efcf9197e318f3dfad5bbfd7541362..2051fcb49ce2ea5b9437697bcad88046d88d170a 100644 (file)
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -382,6 +382,28 @@ Example:
 
 Note: CPUs' indexes are obtained with the 'query-cpus' command.
 
+EQMP
+
+    {
+        .name       = "query-cpu-max",
+        .args_type  = "",
+        .mhandler.cmd_new = qmp_marshal_input_query_cpu_max,
+    },
+
+SQMP
+query-cpu-max
+-------------
+
+Get the maximum CPUs supported by the machine being currently
+emulated.
+
+Returns json-int.
+
+Example:
+
+-> { "execute": "query-cpu-max" }
+<- { "return": 255 }
+
 EQMP
 
     {

diff --git a/vl.c b/vl.c
index aeed7f435dc09309e382059ba3af752bdd9e41b0..7643f163512bb5cf22a36797e9eeef5ba77eff0f 100644 (file)
--- a/vl.c
+++ b/vl.c
@@ -662,6 +662,11 @@ StatusInfo *qmp_query_status(Error **errp)
     return info;
 }
 
+int64_t qmp_query_cpu_max(Error **errp)
+{
+    return current_machine->max_cpus;
+}
+
 /***********************************************************/
 /* real time host monotonic timer */