1. A method of transferring data, comprising: receiving an indication that modified data is available to a guest domain executing on a hypervisor, said modified data including one or more data files in a file system of and originating from a trusted domain executing on the hypervisor; and aliasing each of the one or more data files to be accessible through a file system of the guest domain, wherein aliasing comprises a proxy driver intercepting file system calls within the guest domain and determining whether to execute each file system call within the file system of the guest domain or to pass the file system call to the trusted domain.