GpuHost revised

modules/cloudsim/src/main/java/org/cloudbus/cloudsim/gpu/GpuHost.java

@@ -81,7 +81,7 @@ public class GpuHost extends Host {
 			return true;
 		}
 		// if the VM has a vGPU and the host has no local video card -> return false.
-		else if(getVideoCardAllocationPolicy() == null) {
+		else if (getVideoCardAllocationPolicy() == null) {
 			return false;
 		}
 		// if the VM has a vGPU and the host has video card(s) -> check compatibility.
@@ -122,15 +122,27 @@ public class GpuHost extends Host {
 
 		// Device (GPU) allocation
 		Vgpu vgpu = ((GpuVm) vm).getVgpu();
-		if (vgpu != null) {
-			boolean isGpuAllocated = getVideoCardAllocationPolicy().allocate(vgpu, vgpu.getPCIeBw());
-			if (!isGpuAllocated) {
-				Log.printConcatLine("[VmScheduler.vmCreate] Allocation of GPU accelerated VM #", vm.getId(),
-						" to Host #", getId(), " failed due to vgpu allocation failure.");
+
+		// if the VM has no vGPU -> success.
+		if (vgpu == null) {
+			getVmList().add(vm);
+			vm.setHost(this);
+			return true;
+		}
+		// if the VM has a vGPU but the host has no local video card -> fail.
+		else if (getVideoCardAllocationPolicy() == null) {
 			rollbackHostResourceAllocation(vm);
 			return false;
 		}
-		}
+		// if the VM has a vGPU and the host has local video card(s) -> check
+		boolean isVgpuAllocated = getVideoCardAllocationPolicy().allocate(vgpu, vgpu.getPCIeBw());
+		// if vGPU allocation failed -> fail.
+		if (!isVgpuAllocated) {
+			Log.printConcatLine("[VmScheduler.vmCreate] Allocation of GPU accelerated VM #", vm.getId(), " to Host #",
+					getId(), " failed due to vgpu allocation failure.");
+			rollbackHostResourceAllocation(vm);
+			return false;
+		} // else -> success
 		getVmList().add(vm);
 		vm.setHost(this);
 		return true;