Expose reserved_huge_pages param

Adds the ability to set reserved_huge_pages on nova-computes via a string or
a list of strings.

Change-Id: I50cc58f8039377362e3ec24a1eef16af6ff2f0f6
(cherry picked from commit d7a6b42309)
(cherry picked from commit 33bb6cca39)

manifests/compute.pp

@@ -142,6 +142,12 @@
 #   will disable itself.
 #   Defaults to $::os_service_default
 #
+# [*reserved_huge_pages*]
+#    (optional) Number of huge memory pages to reserved per NUMA host cell.
+#    Defaults to $::os_service_default
+#    Accepts a string e.g "node:0,size:1GB,count:4" or a list of strings e.g:
+#    ["node:0,size:1GB,count:4", "node:1,size:1GB,count:4"]
+#
 # DEPRECATED
 #
 # [*pci_passthrough*]
@@ -183,6 +189,7 @@ class nova::compute (
   $barbican_api_version                        = $::os_service_default,
   $max_concurrent_live_migrations              = $::os_service_default,
   $consecutive_build_service_disable_threshold = $::os_service_default,
+  $reserved_huge_pages                         = $::os_service_default,
   # DEPRECATED PARAMETERS
   $pci_passthrough                             = undef,
 ) {
@@ -207,10 +214,21 @@ class nova::compute (
     })
   }
 
+  if !is_service_default($reserved_huge_pages) and !empty($reserved_huge_pages) {
+    if is_array($reserved_huge_pages) or is_string($reserved_huge_pages) {
+      $reserved_huge_pages_real = $reserved_huge_pages
+    } else {
+      fail("Invalid reserved_huge_pages parameter value: ${reserved_huge_pages}")
+    }
+  } else {
+    $reserved_huge_pages_real = $::os_service_default
+  }
+
   include ::nova::availability_zone
 
   nova_config {
     'DEFAULT/reserved_host_memory_mb':           value => $reserved_host_memory;
+    'DEFAULT/reserved_huge_pages':               value => $reserved_huge_pages_real;
     'DEFAULT/heal_instance_info_cache_interval': value => $heal_instance_info_cache_interval;
     'DEFAULT/resize_confirm_window':             value => $resize_confirm_window;
     'DEFAULT/vcpu_pin_set':                      value => $vcpu_pin_set_real;

releasenotes/notes/add_reserved_huge_pages-883f6feb4e274814.yaml

@@ -0,0 +1,5 @@
+---
+features:
+  - |
+    Add the ability to set reserved_huge_pages on nova-computes via a string or
+    a list of strings.

spec/classes/nova_compute_spec.rb

@@ -35,6 +35,7 @@ describe 'nova::compute' do
       it { is_expected.to contain_nova_config('barbican/auth_endpoint').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('DEFAULT/max_concurrent_live_migrations').with_value('<SERVICE DEFAULT>') }
       it { is_expected.to contain_nova_config('compute/consecutive_build_service_disable_threshold').with_value('<SERVICE DEFAULT>') }
+      it { is_expected.to contain_nova_config('DEFAULT/reserved_huge_pages').with_value('<SERVICE DEFAULT>') }
 
       it { is_expected.to_not contain_package('cryptsetup').with( :ensure => 'present' )}
 
@@ -146,6 +147,32 @@ describe 'nova::compute' do
       end
     end
 
+    context 'with reserved_huge_pages string' do
+      let :params do
+        {
+            :reserved_huge_pages => "foo"
+        }
+      end
+      it 'configures nova reserved_huge_pages entries' do
+        is_expected.to contain_nova_config('DEFAULT/reserved_huge_pages').with(
+          'value' => 'foo'
+        )
+      end
+    end
+
+    context 'with reserved_huge_pages array' do
+      let :params do
+        {
+            :reserved_huge_pages => ["foo", "bar"]
+        }
+      end
+      it 'configures nova reserved_huge_pages entries' do
+        is_expected.to contain_nova_config('DEFAULT/reserved_huge_pages').with(
+          'value' => ['foo','bar']
+        )
+      end
+    end
+
     context 'with pci params array' do
       let :params do
         {