Add pci-alias option

Add a new pci-alias option which supports the use of PCI
devices in flavors. This allows, for example, a GPU or
a SR-IOV device to be automatically allocated to an
instance using a specific flavor.

Change-Id: I249ba04085d37657df0c8e3bb21723a388f08938
Closes-Bug: 1649868

config.yaml

@@ -416,6 +416,23 @@ options:
     description: |
       List of filter class names to use for filtering hosts when not specified in
       the request.
+  pci-alias:
+    type: string
+    default:
+    description: |
+      The pci-passthrough-whitelist option of nova-compute charm is used for
+      specifying which PCI devices are allowed passthrough. pci-alias is more
+      a convenience that can be used in conjunction with Nova flavor properties
+      to automatically assign required PCI devices to new instances. You could,
+      for example, have a GPU flavor or a SR-IOV flavor:
+      
+        pci-alias='{"vendor_id":"8086","product_id":"10ca","name":"a1"}'
+      
+      This configures a new PCI alias 'a1' which will request a PCI device with
+      a vendor id of 0x8086 and a product id of 10ca.
+      
+      For more information about the syntax of pci_alias, refer to
+      https://docs.openstack.org/ocata/config-reference/compute/config-options.html
   api-rate-limit-rules:
     type: string
     default:

hooks/nova_cc_context.py

@@ -261,6 +261,8 @@ class NovaConfigContext(context.WorkerConfigContext):
     def __call__(self):
         ctxt = super(NovaConfigContext, self).__call__()
         ctxt['scheduler_default_filters'] = config('scheduler-default-filters')
+        if config('pci-alias'):
+            ctxt['pci_alias'] = config('pci-alias')
         ctxt['cpu_allocation_ratio'] = config('cpu-allocation-ratio')
         ctxt['ram_allocation_ratio'] = config('ram-allocation-ratio')
         addr = resolve_address(INTERNAL)

templates/kilo/nova.conf

@@ -35,6 +35,9 @@ scheduler_default_filters = {{ scheduler_default_filters }},{{ additional_neutro
 {% else %}
 scheduler_default_filters = {{ scheduler_default_filters }}
 {% endif %}
+{% if pci_alias %}
+pci_alias = {{ pci_alias }}
+{% endif %}
 cpu_allocation_ratio = {{ cpu_allocation_ratio }}
 ram_allocation_ratio = {{ ram_allocation_ratio }}
 

templates/liberty/nova.conf

@@ -35,6 +35,9 @@ scheduler_default_filters = {{ scheduler_default_filters }},{{ additional_neutro
 {% else %}
 scheduler_default_filters = {{ scheduler_default_filters }}
 {% endif %}
+{% if pci_alias %}
+pci_alias = {{ pci_alias }}
+{% endif %}
 cpu_allocation_ratio = {{ cpu_allocation_ratio }}
 ram_allocation_ratio = {{ ram_allocation_ratio }}
 

templates/mitaka/nova.conf

@@ -32,6 +32,9 @@ scheduler_default_filters = {{ scheduler_default_filters }},{{ additional_neutro
 {% else %}
 scheduler_default_filters = {{ scheduler_default_filters }}
 {% endif %}
+{% if pci_alias %}
+pci_alias = {{ pci_alias }}
+{% endif %}
 cpu_allocation_ratio = {{ cpu_allocation_ratio }}
 ram_allocation_ratio = {{ ram_allocation_ratio }}
 

templates/ocata/nova.conf

@@ -183,3 +183,8 @@ auth_strategy=keystone
 
 [wsgi]
 api_paste_config=/etc/nova/api-paste.ini
+
+[pci]
+{% if pci_alias %}
+alias = {{ pci_alias }}
+{% endif %}