[Xen-devel] [PATCH 5/7] QMP: Add cpu-add command

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

From: Igor Mammedov <imammedo@xxxxxxxxxx>

Adds "cpu-add id=xxx" QMP command.

cpu-add's "id" argument is a CPU number in a range [0..max-cpus)

Example QMP command:
 -> { "execute": "cpu-add", "arguments": { "id": 2 } }
 <- { "return": {} }

Signed-off-by: Igor Mammedov <imammedo@xxxxxxxxxx>
Acked-by: Luiz Capitulino <lcapitulino@xxxxxxxxxx>
Reviewed-by: Eric Blake <eblake@xxxxxxxxxx>
Reviewed-by: Eduardo Habkost <ehabkost@xxxxxxxxxx>
Signed-off-by: Andreas FÃrber <afaerber@xxxxxxx>

(cherry picked from QEMU commit 69ca3ea5e192251f27510554611bcff6f036a00b)
Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
---
 qapi-schema.json | 13 +++++++++++++
 qmp-commands.hx  | 23 +++++++++++++++++++++++
 qmp.c            | 10 ++++++++++
 3 files changed, 46 insertions(+)

diff --git a/qapi-schema.json b/qapi-schema.json
index 5dfa052..64cecbe 100644
--- a/qapi-schema.json
+++ b/qapi-schema.json
@@ -1284,6 +1284,19 @@
 { 'command': 'cpu', 'data': {'index': 'int'} }
 
 ##
+# @cpu-add
+#
+# Adds CPU with specified ID
+#
+# @id: ID of CPU to be created, valid values [0..max_cpus)
+#
+# Returns: Nothing on success
+#
+# Since 1.5
+##
+{ 'command': 'cpu-add', 'data': {'id': 'int'} }
+
+##
 # @memsave:
 #
 # Save a portion of guest memory to a file.
diff --git a/qmp-commands.hx b/qmp-commands.hx
index 5c692d0..88e097a 100644
--- a/qmp-commands.hx
+++ b/qmp-commands.hx
@@ -385,6 +385,29 @@ Note: CPUs' indexes are obtained with the 'query-cpus' 
command.
 EQMP
 
     {
+        .name       = "cpu-add",
+        .args_type  = "id:i",
+        .mhandler.cmd_new = qmp_marshal_input_cpu_add,
+    },
+
+SQMP
+cpu-add
+-------
+
+Adds virtual cpu
+
+Arguments:
+
+- "id": cpu id (json-int)
+
+Example:
+
+-> { "execute": "cpu-add", "arguments": { "id": 2 } }
+<- { "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 e3a7f0b..a904568 100644
--- a/qmp.c
+++ b/qmp.c
@@ -23,6 +23,7 @@
 #include "hw/qdev.h"
 #include "blockdev.h"
 #include "qemu/qom-qobject.h"
+#include "hw/boards.h"
 
 NameInfo *qmp_query_name(Error **errp)
 {
@@ -107,6 +108,15 @@ void qmp_cpu(int64_t index, Error **errp)
     /* Just do nothing */
 }
 
+void qmp_cpu_add(int64_t id, Error **errp)
+{
+    if (current_machine->hot_add_cpu) {
+        current_machine->hot_add_cpu(id, errp);
+    } else {
+        error_setg(errp, "Not supported");
+    }
+}
+
 #ifndef CONFIG_VNC
 /* If VNC support is enabled, the "true" query-vnc command is
    defined in the VNC subsystem */
-- 
Anthony PERARD


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