I have tried reconnect host, but error shown
"Call "HostImageConfigManager.QueryHostAcceptanceLevel" for object "imageConfigManager-19371" on vCenter Server "hkvcs01.saehk.sae.com.hk" failed."
Seems your management agents may be hung (hostd), since your VM run as a kernel process they are unaffected.
Did you have any kind of storage issues lately? check the vmkernel.log and hostd.log to see if you see any errors and you could try a restart of the management agents with command services.sh restart.
A : Yes, I am assuming that HKVM is a ESXi host and not a virtual machine.
A : SSH into the host or take DCUI and from shell screen,
log location : /var/log/