problem about writing a hello world for VM

hello, every one!

  I was reading the source code of ResourceMon. As I see in load_current_module() function, when resourcemon has variable vm_is_multi_module set, it would check whether a next VM definition is found. If it is, then vm->start_vm() will be called to start the current vm. 
  The corresponding code is as following:
  bool module_manager_t::load_current_module(){ 
    .....
    if( vm_is_multi_module )
    {
    .....
      L4_Word_t mod_idx = this->current_module + 1;
     while( mod_idx < vm_modules->get_total() )
     {
         vm_modules->get_module_info( mod_idx, mod_cmdline, 
          mod_haddr_start, mod_size );
         if( cmdline_has_vmstart(mod_cmdline) )
      break; // We found the next VM definition.
        }
    }
     ......
    if( !vm->start_vm() )
    {
     printf( "Unable to start the virtual machine.\n");
     goto err_out;
    }

    return true;
.....
  }
My question is : where does the resourcemon load and start the next vm?

Funther, I would write my own VM, can someone give a "hello world" sample code which can run as a VM?

Thanks very much!!!