This is the patch to introduce the query-cpu-max QMP command to get
the maximum number of CPUs supported by the currently running emulator
instance. This may differ machine from machine as defined by -machine
settings and max_cpus member of QEMUMachine structure.
It's been tested both using QMP/qmp utility and telnet session on
the QEMU session.
The HMP counterpart called cpu_max has been introduced by this patch
too.
Signed-off-by: Michal Novotny <minov...@redhat.com>
---
hmp-commands.hx | 14 ++++++++++++++
hmp.c | 15 +++++++++++++++
hmp.h | 1 +
qapi-schema.json | 11 +++++++++++
qmp-commands.hx | 22 ++++++++++++++++++++++
vl.c | 5 +++++
6 files changed, 68 insertions(+)
diff --git a/hmp-commands.hx b/hmp-commands.hx
index 69c707d..b1224e3 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -690,6 +690,20 @@ Set the default CPU.
ETEXI
{
+ .name = "cpu_max",
+ .args_type = "",
+ .params = "",
+ .help = "Get maximum number of VCPUs supported by machine",
+ .mhandler.cmd = hmp_query_cpu_max,
+ },
+
+STEXI
+@item cpu_max
+@findex cpu_max
+Returns the number of CPUs supported by the machine being emulated.
+ETEXI
+
+ {
.name = "mouse_move",
.args_type = "dx_str:s,dy_str:s,dz_str:s?",
.params = "dx dy [dz]",
diff --git a/hmp.c b/hmp.c
index 2f47a8a..742f5c7 100644
--- a/hmp.c
+++ b/hmp.c
@@ -704,6 +704,21 @@ 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;
+ Error *errp = NULL;
+
+ cpu_max = qmp_query_cpu_max(&errp);
+ if (errp) {
+ monitor_printf(mon, "%s\n", error_get_pretty(errp));
+ error_free(errp);
+ return;
+ }
+
+ 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 30b3c20..f0c3352 100644
--- a/hmp.h
+++ b/hmp.h
@@ -41,6 +41,7 @@ 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/qapi-schema.json b/qapi-schema.json
index 28b070f..e828839 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1832,6 +1832,17 @@
{ '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:
#
# @name: the name of the property
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 95022e2..d29de4b 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -385,6 +385,28 @@ 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
+
+ {
.name = "memsave",
.args_type = "val:l,size:i,filename:s,cpu:i?",
.mhandler.cmd_new = qmp_marshal_input_memsave,
diff --git a/vl.c b/vl.c
index 154f7ba..e04feb0 100644
--- a/vl.c
+++ b/vl.c
@@ -632,6 +632,11 @@ StatusInfo *qmp_query_status(Error **errp)
return info;
}
+int qmp_query_cpu_max(Error **errp)
+{
+ return current_machine->max_cpus;
+}
+
/***********************************************************/
/* real time host monotonic timer */
--
1.7.11.7
