Added support pvspinlock in features

Signed-off-by: Abhijeet Kasurde <akasurde@redhat.com>

man/virt-install.pod

@@ -250,6 +250,10 @@ Enable hypver VAPIC, but disable spinlocks
 
 Allow the KVM hypervisor signature to be hidden from the guest
 
+=item B<--features pvspinlock=on>
+
+Notify the guest that the host supports paravirtual spinlocks for example by exposing the pvticketlocks mechanism.
+
 =back
 
 Use --features=? to see a list of all available sub options. Complete details at L<http://libvirt.org/formatdomain.html#elementsFeatures>

tests/xmlparse-xml/change-guest-out.xml

@@ -24,6 +24,7 @@
     <kvm>
       <hidden state="on"/>
     </kvm>
+    <pvspinlock state="on"/>
   </features>
   <numatune>
     <memory nodeset="2,4,6"/>

tests/xmlparse.py

@@ -163,6 +163,7 @@ class XMLParseTest(unittest.TestCase):
         check("hyperv_spinlocks_retries", 12287, 54321)
         check("vmport", False, True)
         check("kvm_hidden", None, True)
+        check("pvspinlock", None, True)
 
         check = self._make_checker(guest.cpu)
         check("match", "exact", "strict")

virtinst/cli.py

@@ -1519,6 +1519,7 @@ class ParserFeatures(VirtCLIParser):
 
         self.set_param("vmport", "vmport", is_onoff=True)
         self.set_param("kvm_hidden", "kvm_hidden", is_onoff=True)
+        self.set_param("pvspinlock", "pvspinlock", is_onoff=True)
 
 
 ###################

virtinst/domainfeatures.py

@@ -50,3 +50,4 @@ class DomainFeatures(XMLBuilder):
     vmport = XMLProperty("./vmport/@state", is_onoff=True,
                          default_name="default", default_cb=lambda s: False)
     kvm_hidden = XMLProperty("./kvm/hidden/@state", is_onoff=True)
+    pvspinlock = XMLProperty("./pvspinlock/@state", is_onoff=True)