DomainCpu: check CPU model name only if model exists

For CPU modes other then "custom" there is no model so we should not
check the suffix of model name.

Signed-off-by: Pavel Hrdina <phrdina@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>

tests/xmlparse.py

@@ -342,10 +342,16 @@ class XMLParseTest(unittest.TestCase):
 
         check = self._make_checker(guest.cpu)
         check("mode", "host-passthrough")
+        guest.cpu.check_security_features(guest)
+        check("secure", False)
         guest.cpu.set_special_mode(guest, "host-model")
         check("mode", "host-model")
+        guest.cpu.check_security_features(guest)
+        check("secure", False)
         guest.cpu.set_model(guest, "qemu64")
         check("model", "qemu64")
+        guest.cpu.check_security_features(guest)
+        check("secure", False)
 
         self._alter_compare(guest.get_xml(), outfile)
 

virtinst/domain/cpu.py

@@ -135,6 +135,7 @@ class DomainCpu(XMLBuilder):
             return
 
         guestFeatures = [f.name for f in self.features if f.policy == "require"]
+        if self.model:
             if self.model.endswith("IBRS"):
                 guestFeatures.append("spec-ctrl")
             if self.model.endswith("IBPB"):