Add support for spinlocks hyperv feature

README.md

@@ -1258,6 +1258,8 @@ Vagrant.configure("2") do |config|
     libvirt.hyperv_feature :name => 'relaxed', :state => 'on'
     # Enable virtual APIC
     libvirt.hyperv_feature :name => 'vapic', :state => 'on'
+    # Enable spinlocks (requires retries to be specified)
+    libvirt.hyperv_feature :name => 'spinlocks', :state => 'on', :retries => '8191'
   end
 end
 ```

lib/vagrant-libvirt/action/create_domain.rb

@@ -237,8 +237,12 @@ module VagrantPlugins
             env[:ui].info(" -- Feature:           #{feature}")
           end
           @features_hyperv.each do |feature|
+            if feature[:name] == 'spinlocks'
+              env[:ui].info(" -- Feature (HyperV):  name=#{feature[:name]}, state=#{feature[:state]}, retries=#{feature[:retries]}")
+            else
               env[:ui].info(" -- Feature (HyperV):  name=#{feature[:name]}, state=#{feature[:state]}")
             end
+          end
           env[:ui].info(" -- Clock offset:      #{@clock_offset}")
           @clock_timers.each do |timer|
             env[:ui].info(" -- Clock timer:       #{timer.map { |k,v| "#{k}=#{v}"}.join(', ')}")

lib/vagrant-libvirt/config.rb

@@ -398,11 +398,21 @@ module VagrantPlugins
           raise 'Feature name AND state must be specified'
         end
 
+        if options[:name] == 'spinlocks' && options[:retries].nil?
+          raise 'Feature spinlocks requires retries parameter'
+        end
+
         @features_hyperv = []  if @features_hyperv == UNSET_VALUE
 
+        if options[:name] == 'spinlocks'
+          @features_hyperv.push(name:   options[:name],
+                             state: options[:state],
+                             retries: options[:retries])
+        else
           @features_hyperv.push(name:   options[:name],
                              state: options[:state])
         end
+      end
 
       def clock_timer(options = {})
         if options[:name].nil?

lib/vagrant-libvirt/templates/domain.xml.erb

@@ -99,7 +99,7 @@
     <% if !@features_hyperv.empty? %>
     <hyperv>
       <% @features_hyperv.each do |feature| %>
-      <<%= feature[:name] %> state='<%= feature[:state] %>' />
+      <<%= feature[:name] %> state='<%= feature[:state] %>'<% if feature[:name] == 'spinlocks' %> retries='<%= feature[:retries] %>'<% end %> />
       <% end %>
     </hyperv>
     <% end %>

spec/unit/templates/domain_all_settings.xml

@@ -34,6 +34,7 @@
     <pae/>
     <hyperv>
       <BBB state='on' />
+      <spinlocks state='on' retries='4096' />
     </hyperv>
   </features>
   <clock offset='variable'>

spec/unit/templates/domain_spec.rb

@@ -43,6 +43,7 @@ describe 'templates/domain' do
       domain.clock_offset = 'variable'
       domain.clock_timer(name: 't1')
       domain.clock_timer(name: 't2', track: 'b', tickpolicy: 'c', frequency: 'd', mode: 'e',  present: 'yes')
+      domain.hyperv_feature(name: 'spinlocks', state: 'on', retries: '4096')
       domain.cputopology(sockets: '1', cores: '3', threads: '2')
       domain.machine_type = 'pc-compatible'
       domain.machine_arch = 'x86_64'