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73b8c91e06
For cross-VM S5 notify via vUART, life_mngr service is running on UOS. It is listening on COM2 to get SOS's commands. The protocol is: SOS send "shutdown", UOS feedback "acked". When SOS triggle shutdown, SOS can 1) check VM's status until UOS stopped, 2) retry shutdown UOS normally with timeout. So, no matter life_mngr server is running, SOS's shutdown procedure will properly finish. Tracked-On: #3564 Signed-off-by: Yuan Liu <yuan1.liu@intel.com>