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+..
+ This work is licensed under a Creative Commons Attribution 3.0 Unported
+ License.
+
+ http://creativecommons.org/licenses/by/3.0/legalcode
+
+=====================================================================
+Allow having placement inventories with reserved value equal to total
+=====================================================================
+
+https://blueprints.launchpad.net/nova/+spec/allow-reserved-equal-total-inventory
+
+Currently, we delete ironic node resource provider inventory from placement
+to indicate that the node is not available for deployment during the cleaning
+process or when in maintenance. This causes placement to report the incorrect
+inventory and capacity information, as the node is actually still present, and
+its inventory remains the same. Reserving all the inventory describes more
+accurately what is going on. Also doing the resource reservation will allow
+us to fix bugs like [1] properly, as it is possible to set reservation for
+inventory before deleting the allocation, even if inventory gets exceeded
+because of that. But placement API does not allow to set reserved value to be
+equal to total in the inventory record.
+
+
+Problem description
+===================
+
+Placement API does not allow to set reserved value to be equal to total in the
+inventory record. This makes ironic virt driver to delete inventory records
+from placement e.g. during node cleaning instead of reserving them.
+
+Deleting resource provider inventory should mean that it is actually gone.
+For purposes of indicating that resources are temporarily unavailable
+placement provides the ``reserved`` field in the inventory object. This will
+enable placement to report the correct inventory and capacity information.
+It will also enable us to fix ironic virt driver issue [1].
+
+Use Cases
+---------
+
+1. Reserve ironic node inventory during node cleaning or maintenance.
+
+2. Reserve FPGA inventory during its programming by cyborg.
+
+
+Proposed change
+===============
+
+Add a new microversion to placement API that will allow to set reserved value
+of the inventory record to be equal to total value. It will become the
+placement behaviour for all subsequent microversion.
+
+This new microversion will be used by nova scheduler report client when
+doing the inventory update calls. This will enable virt drivers in nova
+to decide whether they need to report all the inventory resources as reserved
+in the ``get_inventory()`` call.
+
+Alternatives
+------------
+
+None
+
+Data model impact
+-----------------
+
+None
+
+REST API impact
+---------------
+
+``POST /resource_providers/<UUID>/inventories``,
+``PUT /resource_providers/<UUID>/inventories`` and
+``PUT /resource_providers/<UUID>/inventories/<RC>`` API endpoints will return
+response code ``200`` instead of ``400`` when called with
+new microversion and body containing inventory records that have reserved
+value equal to total.
+
+Example request:
+
+path -- ``PUT /resource_providers/UUID/inventories``
+
+headers -- ``Content-type: application/json``,
+           ``Openstack-API-Version: placement 1.NEW_MV``
+
+body::
+
+    {
+        "inventories": {
+            "CUSTOM_GOLD": {
+                "total": 1,
+                "reserved": 1
+            }
+        },
+        "resource_provider_generation": 5
+    }
+
+Example response:
+
+``200 OK``
+
+Security impact
+---------------
+
+None
+
+Notifications impact
+--------------------
+
+None
+
+Other end user impact
+---------------------
+
+None
+
+Performance Impact
+------------------
+
+None
+
+Other deployer impact
+---------------------
+
+None
+
+Developer impact
+----------------
+
+Virt drivers now are able to set the ``reserved`` key in the
+``get_inventory()`` returned dictionary to a total inventory value when needed.
+
+Upgrade impact
+--------------
+
+None
+
+
+Implementation
+==============
+
+Assignee(s)
+-----------
+
+Primary assignee:
+  vdrok
+
+Work Items
+----------
+
+* change to placement API adding the logic and new microversion
+
+* change scheduler report client to use the new microversion during inventory
+  update calls
+
+* change ironic virt driver to report resources as reserved during cleaning
+  and maintenance
+
+
+Dependencies
+============
+
+None
+
+
+Testing
+=======
+
+Unit and functional testing will be added.
+
+
+Documentation Impact
+====================
+
+API reference will be updated.
+
+
+References
+==========
+
+[0] https://etherpad.openstack.org/p/nova-ptg-Rocky
+
+[1] https://bugs.launchpad.net/nova/+bug/1771577
+
+
+History
+=======
+
+.. list-table:: Revisions
+   :header-rows: 1
+
+   * - Release Name
+     - Description
+   * - Rocky
+     - Introduced