[Qemu-devel] [PATCH v3 1/3] Deprecate QMP `cpu-add`

[Kashyap Chamarthy <kchamart@redhat.com>]

The intended functionality of QMP `cpu-add` is replaced with
`device_add` (and `query-hotpluggable-cpus`).  So let's deprecate
`cpu-add`.

A complete example of vCPU hotplug with the recommended way (using
`device_add`) is provided as part of a seperate docs patch.

Suggested-by: Eduardo Habkost <ehabkost@redhat.com
Signed-off-by: Kashyap Chamarthy <kchamart@redhat.com>
---
---
 qapi/misc.json       | 8 +++++++-
 qemu-deprecated.texi | 5 +++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/qapi/misc.json b/qapi/misc.json
index d450cfef21..fbee1e6d34 100644
--- a/qapi/misc.json
+++ b/qapi/misc.json
@@ -1104,7 +1104,7 @@
 ##
 # @cpu-add:
 #
-# Adds CPU with specified ID
+# Adds CPU with specified ID.
 #
 # @id: ID of CPU to be created, valid values [0..max_cpus)
 #
@@ -1112,6 +1112,10 @@
 #
 # Since: 1.5
 #
+# Note: This command is deprecated.  The `device_add` command should be
+#       used instead.  See the `query-hotpluggable-cpus` command for
+#       details.
+#
 # Example:
 #
 # -> { "execute": "cpu-add", "arguments": { "id": 2 } }
@@ -3213,6 +3217,8 @@
 ##
 # @query-hotpluggable-cpus:
 #
+# TODO: Better documentation; currently there is none.
+#
 # Returns: a list of HotpluggableCPU objects.
 #
 # Since: 2.7
diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi
index 1b9c007f12..c86924ad9a 100644
--- a/qemu-deprecated.texi
+++ b/qemu-deprecated.texi
@@ -155,6 +155,11 @@ The ``query-cpus'' command is replaced by the ``query-cpus-fast'' command.
 The ``arch'' output member of the ``query-cpus-fast'' command is
 replaced by the ``target'' output member.
 
+@subsection cpu-add (since 3.1)
+
+Use ``device_add'' for hotplugging vCPUs instead of ``cpu-add''.  See
+documentation of ``query-hotpluggable-cpus'' for additional details.
+
 @section System emulator devices
 
 @subsection ivshmem (since 2.6.0)
-- 
2.17.1