VirtIO is a specification for para-virtualized I/O in a virtual machine (VM).
Traditionally, the hypervisor emulated real devices such as an Ethernet
interface or disk controller to provide the VM with I/O.
This emulation is often inefficient.
VirtIO defines an interface for efficient I/O between the hypervisor and VM.
module provides a shared memory transport called a virtqueue.
device driver represents an emulated PCI device that the hypervisor makes
available to the VM.
This device provides the probing, configuration, and
interrupt notifications needed to interact with the hypervisor.
supports the following VirtIO devices:
An emulated Ethernet device is provided by the
An emulated disk controller is provided by the
An emulated SCSI HBA is provided by the
A pseudo-device to allow the VM to release memory back to the hypervisor is
provided by the