Systems, methods and computer program products for high availability enhancements of virtual security module servers. Exemplary embodiments include a command processing method, including receiving a command from a virtual machine monitor in an I/O controller of a recipient virtual security appliance, determining a load of a crypto engine of the recipient virtual security appliance to assign a master/slave flag, the crypto engine having a master virtual trusted platform module and a slave trusted platform module, assigning a master/slave flag to the command to identify a command type, determining the command type in the I/O controller, receiving output from the crypto engine and returning the output to the virtual machine monitor.