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.Dd June 7, 2018 .Dt VIRTIO 4 .Os .Sh NAME .Nm virtio .Nd Para-virtualized I/O in a virtual machine .Sh SYNOPSIS .Cd "virtio* at fdt?" .Cd "virtio* at pci? dev ? function ?" .Cd "ld* at virtio?" .Cd "viocon* at virtio?" .Cd "vioif* at virtio?" .Cd "viomb* at virtio?" .Cd "viornd* at virtio?" .Cd "vioscsi* at virtio?" .Sh DESCRIPTION .Nm defines an interface for efficient, standard and extensible I/O between the hypervisor and the virtual machine. The .Nm device driver represents an emulated device that the hypervisor makes available to the virtual machine.
p .Nm driver itself provides the core infrastructure to communicate with the hypervisor (called virtqueues) and supports the following devices:
p l -tag -width Xr -compact t Xr ld 4 A Disk device. t Xr viocon 4 Console device. t Xr vioif 4 An Ethernet device. t Xr viomb 4 A pseudo-device to release memory back to the hypervisor. t Xr viornd 4 An entropy source. t Xr vioscsi 4 A SCSI adapter. .El .Sh SEE ALSO .Xr ld 4 , .Xr pci 4 , .Xr viocon 4 , .Xr vioif 4 , .Xr viomb 4 , .Xr viornd 4 , .Xr vioscsi 4
p .Rs .%A Rusty Russell, IBM Corporation .%T Virtio PCI Card Specification .%U http://ozlabs.org/~rusty/virtio-spec/ .Re .Rs .%T Virtual I/O Device (VIRTIO) Version 1.0 .%U https://docs.oasis-open.org/virtio/virtio/v1.0/virtio-v1.0.html .Re .Sh HISTORY The .Nm driver first appeared in .Nx 6.0 .
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