problem about writing a hello world for VM

[于爱民]

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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!!!

 

[Jan Stoess]

> My question is : where does the resourcemon load and start the next vm?

The boot process follows a cooperative scheme where the next VM is started
in IResourcemon_client_init_complete_implementation(), which is a callback
function invoked by the current wedge via IDL.  

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

You could look at some toy OSes built upon L4 for that purpose: e.g.,
http://l4ka.org/relatedprojects.php lists a couple of such OSes developed by
students during course projects here at the chair.

-Jan
 
--
Jan Stoess
System Architecture Group
University of Karlsruhe
Phone: [phone]
Fax: [phone]
eMail: stoess@...