Domain migration source code interpretation in xl/libxl (xen-4.1.2)

Domain migration source code interpretation in xl/libxl (xen-4.1.2)

[Alain Tchana]

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Hi all, 
I am trying to understand domU migration in xen-4.1.2/tools/libxl/xm_cmdimpl.c. Here are my questions: 

1) Is there any documentation which explain each functions? 

2) What is the difference between these two functions: int main_migrate(int argc, char **argv) and int main_migrate_receive(int argc, char **argv)? 

3) In the function: static void migrate_domain(const char *domain_spec, const char *rune, const char *override_config_file) , 
what does: 

*) save_domain_core_begin(domain_spec, override_config_file, &config_data, &config_len); 

*)migrate_read_fixedmessage(recv_fd, migrate_receiver_banner, 
sizeof(migrate_receiver_banner)-1, 
"banner", rune); 

*)save_domain_core_writeconfig(send_fd, "migration stream", 
config_data, config_len); 

*)migration_child_report(child, recv_fd); 

*)Finally, which section of the" migrate_domain" function performs memory copy from the initial host to the target host? 

Please, apologize the number of questions. 

Thanks in advance for your answers. 
Alain 

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