how to change the context of running process

[bigclouds]

hi,all
1.
how to change the context of running process.
2.
in my case, libvirtd is initrc_t, how to find  where and which file defines this rule?
libvirtd should be virtd_t, i want to correct it.

3.audot2allow outputs a rule ,'allow initrc_t svirt_t:process transition'
is there a comamnd line tool can finish this request?  not to install .pp module?

thanks