US Patent 10540294 Secure zero-copy packet forwarding

A hypervisor detects a virtual device configured by a virtual machine, generates a para-virtualized networking interface between the virtual device and a memory space within hypervisor memory, maps the memory space to a peripheral component interconnect (PCI) memory space of the virtual machine, and configures the memory space to be accessible to a physical device via direct memory access (DMA), where the physical device is associated with the virtual device of the virtual machine. The hypervisor then transfer packets between the virtual machine and the physical device using the para-virtualized networking interface.