diff --git a/hypervisor/constants.go b/hypervisor/constants.go
index f9dee7b8..6695109c 100644
--- a/hypervisor/constants.go
+++ b/hypervisor/constants.go
@@ -45,7 +45,6 @@ const (
 	COMMAND_STOP_POD
 	COMMAND_SHUTDOWN
 	COMMAND_RELEASE
-	COMMAND_NEWCONTAINER
 	COMMAND_ONLINECPUMEM
 	COMMAND_ATTACH
 	COMMAND_DETACH
@@ -116,8 +115,6 @@ func EventString(ev int) string {
 		return "COMMAND_SHUTDOWN"
 	case COMMAND_RELEASE:
 		return "COMMAND_RELEASE"
-	case COMMAND_NEWCONTAINER:
-		return "COMMAND_NEWCONTAINER"
 	case COMMAND_ATTACH:
 		return "COMMAND_ATTACH"
 	case COMMAND_DETACH:
diff --git a/hypervisor/events.go b/hypervisor/events.go
index a227ccc4..e7f22137 100644
--- a/hypervisor/events.go
+++ b/hypervisor/events.go
@@ -49,11 +49,6 @@ type RunPodCommand struct {
 
 type ReplacePodCommand RunPodCommand
 
-type NewContainerCommand struct {
-	container *pod.UserContainer
-	info      *ContainerInfo
-}
-
 type OnlineCpuMemCommand struct{}
 
 type ShutdownCommand struct {
@@ -211,7 +206,6 @@ func (qe *NetDevRemovedEvent) Event() int    { return EVENT_INTERFACE_EJECTED }
 func (qe *RunPodCommand) Event() int         { return COMMAND_RUN_POD }
 func (qe *GetPodStatsCommand) Event() int    { return COMMAND_GET_POD_STATS }
 func (qe *ReplacePodCommand) Event() int     { return COMMAND_REPLACE_POD }
-func (qe *NewContainerCommand) Event() int   { return COMMAND_NEWCONTAINER }
 func (qe *OnlineCpuMemCommand) Event() int   { return COMMAND_ONLINECPUMEM }
 func (qe *AttachCommand) Event() int         { return COMMAND_ATTACH }
 func (qe *WindowSizeCommand) Event() int     { return COMMAND_WINDOWSIZE }
diff --git a/hypervisor/vm.go b/hypervisor/vm.go
index 93382acd..59d0b1f0 100644
--- a/hypervisor/vm.go
+++ b/hypervisor/vm.go
@@ -567,12 +567,22 @@ func (vm *Vm) AddProcess(container, execId string, terminal bool, args []string,
 }
 
 func (vm *Vm) NewContainer(c *pod.UserContainer, info *ContainerInfo) error {
-	newContainerCommand := &NewContainerCommand{
-		container: c,
-		info:      info,
+	err := vm.GenericOperation("NewContainer", func(ctx *VmContext, result chan<- error) {
+		ctx.newContainer(c, info, result)
+	}, StateInit, StateRunning)
+
+	if err != nil {
+		return fmt.Errorf("Create new container failed: %v", err)
 	}
 
-	vm.Hub <- newContainerCommand
+	vm.GenericOperation("StartNewContainerStdin", func(ctx *VmContext, result chan<- error) {
+		// start stdin. TODO: find the correct idx if parallel multi INIT_NEWCONTAINER
+		idx := len(ctx.vmSpec.Containers) - 1
+		c := ctx.vmSpec.Containers[idx]
+		ctx.ptys.startStdin(c.Process.Stdio, c.Process.Terminal)
+		result <- nil
+	}, StateInit, StateRunning)
+
 	return nil
 }
 
diff --git a/hypervisor/vm_states.go b/hypervisor/vm_states.go
index 030529c9..8cd983ff 100644
--- a/hypervisor/vm_states.go
+++ b/hypervisor/vm_states.go
@@ -85,24 +85,24 @@ func (ctx *VmContext) prepareDevice(cmd *RunPodCommand) bool {
 	return true
 }
 
-func (ctx *VmContext) prepareContainer(cmd *NewContainerCommand) *hyperstartapi.Container {
+func (ctx *VmContext) prepareContainer(spec *pod.UserContainer, info *ContainerInfo) *hyperstartapi.Container {
 	ctx.lock.Lock()
 
 	idx := len(ctx.vmSpec.Containers)
 	vmContainer := &hyperstartapi.Container{}
 
-	ctx.initContainerInfo(idx, vmContainer, cmd.container)
-	ctx.setContainerInfo(idx, vmContainer, cmd.info)
+	ctx.initContainerInfo(idx, vmContainer, spec)
+	ctx.setContainerInfo(idx, vmContainer, info)
 
-	vmContainer.Sysctl = cmd.container.Sysctl
+	vmContainer.Sysctl = spec.Sysctl
 	vmContainer.Process.Stdio = ctx.ptys.attachId
 	ctx.ptys.attachId++
-	if !cmd.container.Tty {
+	if !spec.Tty {
 		vmContainer.Process.Stderr = ctx.ptys.attachId
 		ctx.ptys.attachId++
 	}
 
-	ctx.userSpec.Containers = append(ctx.userSpec.Containers, *cmd.container)
+	ctx.userSpec.Containers = append(ctx.userSpec.Containers, *spec)
 	ctx.vmSpec.Containers = append(ctx.vmSpec.Containers, *vmContainer)
 
 	ctx.lock.Unlock()
@@ -122,12 +122,13 @@ func (ctx *VmContext) prepareContainer(cmd *NewContainerCommand) *hyperstartapi.
 	return vmContainer
 }
 
-func (ctx *VmContext) newContainer(cmd *NewContainerCommand) {
-	c := ctx.prepareContainer(cmd)
+func (ctx *VmContext) newContainer(spec *pod.UserContainer, info *ContainerInfo, result chan<- error) {
+	c := ctx.prepareContainer(spec, info)
 	glog.Infof("start sending INIT_NEWCONTAINER")
 	ctx.vm <- &hyperstartCmd{
 		Code:    hyperstartapi.INIT_NEWCONTAINER,
 		Message: c,
+		result:  result,
 	}
 	glog.Infof("sent INIT_NEWCONTAINER")
 }
@@ -428,8 +429,6 @@ func stateInit(ctx *VmContext, ev VmEvent) {
 			ctx.shutdownVM(false, "")
 			ctx.Become(stateDestroying, StateDestroying)
 			ctx.reportVmShutdown()
-		case COMMAND_NEWCONTAINER:
-			ctx.newContainer(ev.(*NewContainerCommand))
 		case COMMAND_ONLINECPUMEM:
 			ctx.onlineCpuMem(ev.(*OnlineCpuMemCommand))
 		case COMMAND_WINDOWSIZE:
@@ -441,17 +440,6 @@ func stateInit(ctx *VmContext, ev VmEvent) {
 				ctx.setTimeout(60)
 				ctx.Become(stateStarting, StateStarting)
 			}
-		case COMMAND_ACK:
-			ack := ev.(*CommandAck)
-			glog.V(1).Infof("[init] got init ack to %d", ack.reply)
-			if ack.reply.Code == hyperstartapi.INIT_NEWCONTAINER {
-				glog.Infof("Get ack for new container")
-
-				// start stdin. TODO: find the correct idx if parallel multi INIT_NEWCONTAINER
-				idx := len(ctx.vmSpec.Containers) - 1
-				c := ctx.vmSpec.Containers[idx]
-				ctx.ptys.startStdin(c.Process.Stdio, c.Process.Terminal)
-			}
 		default:
 			unexpectedEventHandler(ctx, ev, "pod initiating")
 		}
@@ -547,8 +535,6 @@ func stateRunning(ctx *VmContext, ev VmEvent) {
 			glog.Info("pod is running, got release command, let VM fly")
 			ctx.Become(nil, StateNone)
 			ctx.reportSuccess("", nil)
-		case COMMAND_NEWCONTAINER:
-			ctx.newContainer(ev.(*NewContainerCommand))
 		case COMMAND_WINDOWSIZE:
 			cmd := ev.(*WindowSizeCommand)
 			ctx.setWindowSize(cmd.ContainerId, cmd.ExecId, cmd.Size)
@@ -556,17 +542,6 @@ func stateRunning(ctx *VmContext, ev VmEvent) {
 			result := ev.(*PodFinished)
 			ctx.reportPodFinished(result)
 			ctx.exitVM(false, "", true, false)
-		case COMMAND_ACK:
-			ack := ev.(*CommandAck)
-			glog.V(1).Infof("[running] got init ack to %d", ack.reply)
-
-			if ack.reply.Code == hyperstartapi.INIT_NEWCONTAINER {
-				glog.Infof("Get ack for new container")
-				// start stdin. TODO: find the correct idx if parallel multi INIT_NEWCONTAINER
-				idx := len(ctx.vmSpec.Containers) - 1
-				c := ctx.vmSpec.Containers[idx]
-				ctx.ptys.startStdin(c.Process.Stdio, c.Process.Terminal)
-			}
 		case COMMAND_GET_POD_STATS:
 			ctx.reportPodStats(ev)
 		case EVENT_INTERFACE_EJECTED: