1. A method for displaying alerts provided by applications of a guest environment in a notification bar controlled by a host operating system (OS) in a host environment of a mobile device, wherein the guest environment is running in a virtual machine supported by a hypervisor running within the host environment, the method comprising: registering, by a hypervisor-aware service running in the virtual machine, with a guest OS of the virtual machine to be notified by the guest OS when applications of the guest environment request the guest OS to present alerts in a notification bar controlled by the guest OS; upon receipt by the hypervisor-aware service of a notification by the guest OS of an application requesting presentation of an alert in the notification bar controlled by the guest OS, forwarding the notification to the hypervisor; and transmitting, by the hypervisor, a corresponding request to a notification management component of the host OS to present the alert on the notification bar controlled by the host OS.