Securely sending a complete initialization package in one example implementation can include adding a resource identifier that includes a mapping of a driver to a hardware component included in a physical machine hosting VMs to an initial random-access memory (RAM) file system (INITRAMFS) stored in memory of the physical machine to form a complete initialization package, sending the complete initialization package from read-only memory (ROM) of the physical machine to a location in RAM of the physical machine accessible by a hypervisor, and authenticating that the complete initialization package is secure.