[Qemu-devel] [PATCH 11/12] qmp: add cpu_set qmp command

[Igor Mammedov <imammedo@redhat.com>]

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 include/sysemu/sysemu.h |    2 ++
 qapi-schema.json        |    9 +++++++++
 qmp-commands.hx         |   26 ++++++++++++++++++++++++++
 qmp.c                   |   12 ++++++++++++
 stubs/Makefile.objs     |    1 +
 stubs/do_cpu_hot_add.c  |    7 +++++++
 6 files changed, 57 insertions(+), 0 deletions(-)
 create mode 100644 stubs/do_cpu_hot_add.c

diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 4b8f721..8bcaf26 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -156,6 +156,8 @@ void drive_hot_add(Monitor *mon, const QDict *qdict);
 void qemu_register_cpu_add_notifier(Notifier *notifier);
 void qemu_system_cpu_hotplug_request(uint32_t id);
 
+void do_cpu_hot_add(const int64_t id, Error **errp);
+
 /* pcie aer error injection */
 void pcie_aer_inject_error_print(Monitor *mon, const QObject *data);
 int do_pcie_aer_inject_error(Monitor *mon,
diff --git a/qapi-schema.json b/qapi-schema.json
index fdaa9da..7acec6e 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1385,6 +1385,15 @@
 { 'command': 'cpu', 'data': {'index': 'int'} }
 
 ##
+# @cpu_set
+#
+# Sets specified cpu to online/ofline mode
+#
+# Notes: semantics is : cpu_set id=x status=online|offline
+##
+{ 'command': 'cpu_set', 'data': {'id': 'int', 'status': 'str'} }
+
+##
 # @memsave:
 #
 # Save a portion of guest memory to a file.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index b370060..283df76 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -385,6 +385,32 @@ Note: CPUs' indexes are obtained with the 'query-cpus' command.
 EQMP
 
     {
+        .name       = "cpu_set",
+        .args_type  = "id:i,status:s",
+        .mhandler.cmd_new = qmp_marshal_input_cpu_set,
+    },
+
+SQMP
+cpu_set
+-------
+
+Sets virtual cpu to online/ofline state
+
+Arguments:
+
+- "id": virtual cpu id (json-int)
+- "status": desired state of cpu, online/offline (json-string)
+
+Example:
+
+-> { "execute": "cpu_set",
+             "arguments": { "id": 2,
+                            "status": "online" } }
+<- { "return": {} }
+
+EQMP
+
+    {
         .name       = "memsave",
         .args_type  = "val:l,size:i,filename:s,cpu:i?",
         .mhandler.cmd_new = qmp_marshal_input_memsave,
diff --git a/qmp.c b/qmp.c
index 55b056b..5b84779 100644
--- a/qmp.c
+++ b/qmp.c
@@ -108,6 +108,18 @@ void qmp_cpu(int64_t index, Error **errp)
     /* Just do nothing */
 }
 
+void qmp_cpu_set(int64_t id, const char *status, Error **errp)
+{
+    if (!strcmp(status, "online")) {
+        do_cpu_hot_add(id, errp);
+    } else if (!strcmp(status, "offline")) {
+        error_setg(errp, "Unplug is not implemented");
+    } else {
+        error_setg(errp, "Invalid parameter '%s'", status);
+        return;
+    }
+}
+
 #ifndef CONFIG_VNC
 /* If VNC support is enabled, the "true" query-vnc command is
    defined in the VNC subsystem */
diff --git a/stubs/Makefile.objs b/stubs/Makefile.objs
index 6a492f5..4154a2b 100644
--- a/stubs/Makefile.objs
+++ b/stubs/Makefile.objs
@@ -26,3 +26,4 @@ stub-obj-$(CONFIG_WIN32) += fd-register.o
 stub-obj-y += resume_vcpu.o
 stub-obj-y += get_icc_bus.o
 stub-obj-y += qemu_system_cpu_hotplug_request.o
+stub-obj-y += do_cpu_hot_add.o
diff --git a/stubs/do_cpu_hot_add.c b/stubs/do_cpu_hot_add.c
new file mode 100644
index 0000000..1f6d7a6
--- /dev/null
+++ b/stubs/do_cpu_hot_add.c
@@ -0,0 +1,7 @@
+#include "qapi/error.h"
+#include "sysemu/sysemu.h"
+
+void do_cpu_hot_add(const int64_t id, Error **errp)
+{
+    error_setg(errp, "Not implemented");
+}
-- 
1.7.1