diff --git a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
index 9a4ae16cadb..55b49c2ca31 100755
--- a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
+++ b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtComputingResource.java
@@ -454,6 +454,7 @@ public class LibvirtComputingResource extends ServerResourceBase implements Serv
     protected boolean _noKvmClock;
     protected String _videoHw;
     protected int _videoRam;
+    protected Pair<Integer,Integer> hostOsVersion;
     private final Map <String, String> _pifs = new HashMap<String, String>();
     private final Map<String, VmStats> _vmStats = new ConcurrentHashMap<String, VmStats>();
 
@@ -965,6 +966,7 @@ public class LibvirtComputingResource extends ServerResourceBase implements Serv
         String[] kernelVersions = unameKernelVersion.split("[\\.\\-]");
         _kernelVersion = Integer.parseInt(kernelVersions[0]) * 1000 * 1000 + Integer.parseInt(kernelVersions[1]) * 1000 + Integer.parseInt(kernelVersions[2]);
 
+        getOsVersion();
         return true;
     }
 
@@ -3606,6 +3608,24 @@ public class LibvirtComputingResource extends ServerResourceBase implements Serv
         return uuid;
     }
 
+    private void getOsVersion() {
+        String version = Script.runSimpleBashScript("cat /etc/redhat-release | awk '{print $7}'");
+        if (version != null) {
+            String[] versions = version.split(".");
+            if (versions.length == 2) {
+                String major = versions[0];
+                String minor = versions[1];
+                try {
+                    Integer m = Integer.parseInt(major);
+                    Integer min = Integer.parseInt(minor);
+                    hostOsVersion = new Pair<>(m, min);
+                } catch(NumberFormatException e) {
+
+                }
+            }
+        }
+    }
+
     protected LibvirtVMDef createVMFromSpec(VirtualMachineTO vmTO) {
         LibvirtVMDef vm = new LibvirtVMDef();
         vm.setDomainName(vmTO.getName());
@@ -3684,6 +3704,12 @@ public class LibvirtComputingResource extends ServerResourceBase implements Serv
         features.addFeatures("pae");
         features.addFeatures("apic");
         features.addFeatures("acpi");
+        //for rhel 6.5 and above, hyperv enlightment feature is added
+        if (vmTO.getOs().contains("Windows Server 2008") && hostOsVersion != null && ((hostOsVersion.first() == 6 && hostOsVersion.second() >= 5) || (hostOsVersion.first() >= 7))) {
+            LibvirtVMDef.HyperVEnlightenmentFeatureDef hyv = new LibvirtVMDef.HyperVEnlightenmentFeatureDef();
+            hyv.setRelaxed(true);
+            features.addHyperVFeature(hyv);
+        }
         vm.addComp(features);
 
         TermPolicy term = new TermPolicy();
diff --git a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtVMDef.java b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtVMDef.java
index bc952042215..2ce24421a97 100644
--- a/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtVMDef.java
+++ b/plugins/hypervisors/kvm/src/com/cloud/hypervisor/kvm/resource/LibvirtVMDef.java
@@ -173,13 +173,42 @@ public class LibvirtVMDef {
         }
     }
 
+    public static class HyperVEnlightenmentFeatureDef {
+        private final Map<String, String> features = new HashMap<String,String>();
+        public void setRelaxed(boolean on) {
+            String state = on ? "On":"Off";
+            features.put("relaxed", state);
+        }
+        @Override
+        public String toString() {
+            if (features.isEmpty()) {
+                return "";
+            }
+            StringBuilder feaBuilder = new StringBuilder();
+            feaBuilder.append("<hyperv>\n");
+            for (Map.Entry<String, String> e : features.entrySet()) {
+                feaBuilder.append("<");
+                feaBuilder.append(e.getKey());
+                feaBuilder.append(" state='" + e.getValue() + "'");
+                feaBuilder.append("/>\n");
+            }
+            feaBuilder.append("</hyperv>\n");
+            return feaBuilder.toString();
+        }
+    }
+
     public static class FeaturesDef {
         private final List<String> _features = new ArrayList<String>();
 
+        private HyperVEnlightenmentFeatureDef hyperVEnlightenmentFeatureDef = null;
         public void addFeatures(String feature) {
             _features.add(feature);
         }
 
+        public void addHyperVFeature(HyperVEnlightenmentFeatureDef hyperVEnlightenmentFeatureDef) {
+            this.hyperVEnlightenmentFeatureDef = hyperVEnlightenmentFeatureDef;
+        }
+
         @Override
         public String toString() {
             StringBuilder feaBuilder = new StringBuilder();
@@ -187,6 +216,12 @@ public class LibvirtVMDef {
             for (String feature : _features) {
                 feaBuilder.append("<" + feature + "/>\n");
             }
+            if (hyperVEnlightenmentFeatureDef != null) {
+                String hpervF = hyperVEnlightenmentFeatureDef.toString();
+                if (hpervF != "") {
+                    feaBuilder.append(hpervF);
+                }
+            }
             feaBuilder.append("</features>\n");
             return feaBuilder.toString();
         }
diff --git a/plugins/hypervisors/kvm/test/com/cloud/hypervisor/kvm/resource/LibvirtVMDefTest.java b/plugins/hypervisors/kvm/test/com/cloud/hypervisor/kvm/resource/LibvirtVMDefTest.java
index aa7570c3638..ddbe256aeb6 100644
--- a/plugins/hypervisors/kvm/test/com/cloud/hypervisor/kvm/resource/LibvirtVMDefTest.java
+++ b/plugins/hypervisors/kvm/test/com/cloud/hypervisor/kvm/resource/LibvirtVMDefTest.java
@@ -21,6 +21,7 @@ package com.cloud.hypervisor.kvm.resource;
 
 import junit.framework.TestCase;
 import com.cloud.hypervisor.kvm.resource.LibvirtVMDef.DiskDef;
+import com.cloud.utils.Pair;
 
 public class LibvirtVMDefTest extends TestCase {
 
@@ -90,4 +91,25 @@ public class LibvirtVMDefTest extends TestCase {
         assertEquals(xmlDef, expectedXml);
     }
 
+    public void testHypervEnlightDef() {
+        LibvirtVMDef.FeaturesDef featuresDef = new LibvirtVMDef.FeaturesDef();
+        LibvirtVMDef.HyperVEnlightenmentFeatureDef hyperVEnlightenmentFeatureDef = new LibvirtVMDef.HyperVEnlightenmentFeatureDef();
+        hyperVEnlightenmentFeatureDef.setRelaxed(true);
+        featuresDef.addHyperVFeature(hyperVEnlightenmentFeatureDef);
+        String defs = featuresDef.toString();
+        assertTrue(defs.contains("relaxed"));
+
+        featuresDef = new LibvirtVMDef.FeaturesDef();
+        featuresDef.addFeatures("pae");
+        defs = featuresDef.toString();
+        assertFalse(defs.contains("relaxed"));
+
+        assertTrue("Windows Server 2008 R2".contains("Windows Server 2008"));
+
+        Pair<Integer,Integer> hostOsVersion = new Pair<Integer,Integer>(6,5);
+        assertTrue((hostOsVersion.first() == 6 && hostOsVersion.second() >= 5) || (hostOsVersion.first() >= 7));
+        hostOsVersion = new Pair<Integer,Integer>(7,1);
+        assertTrue((hostOsVersion.first() == 6 && hostOsVersion.second() >= 5) || (hostOsVersion.first() >= 7));
+    }
+
 }