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add viogpu(4); from diana eichert

.\"     $OpenBSD: virtio.4,v 1.17 2023/04/26 22:34:30 jmc Exp $
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.\" Copyright (c) 2012 Stefan Fritsch <sf@sfritsch.de>
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.Dd $Mdocdate: April 26 2023 $
.Dt VIRTIO 4
.Os
.Sh NAME
.Nm virtio
.Nd VirtIO support driver
.Sh SYNOPSIS
.Cd "virtio* at fdt?"
.Cd "virtio* at pci? flags 0x00"
.Sh DESCRIPTION
The
.Nm
driver provides support service for paravirtualized devices using the VirtIO
protocol.
Such devices are provided by bhyve, KVM, QEMU, VirtualBox, and
.Xr vmm 4 .
.Pp
Currently there are drivers for the following
.Nm
devices:
.Pp
.Bl -tag -width "vioscsi(4)XXX" -offset indent -compact
.It Xr vio 4
VirtIO network device
.It Xr vioblk 4
VirtIO disk
.It Xr viocon 4
VirtIO console device
.It Xr viogpu 4
VirtIO GPU device
.It Xr viomb 4
VirtIO memory ballooning driver
.It Xr viornd 4
VirtIO random number device
.It Xr vioscsi 4
VirtIO SCSI adapter
.It Xr vmmci 4
.Xr vmm 4
control interface
.El
.Pp
The
.Nm
driver conforms to the virtio 0.9.5 specification.
The virtio 1.0 standard is only supported for PCI devices.
.Pp
By default 0.9 is preferred over 1.0.
This can be changed by setting the bit 0x4 in the flags.
Setting the bit 0x8 in the flags disables 1.0 support completely.
.Sh SEE ALSO
.Xr intro 4
.Sh HISTORY
The
.Nm
driver first appeared in
.Ox 5.3 .
.Sh AUTHORS
.An -nosplit
The
.Nm
driver was ported to
.Ox
and improved by
.An Stefan Fritsch Aq Mt sf@sfritsch.de .
It is based on the
.Nx
driver by
.An Minoura Makoto .
.Sh BUGS
.Nm
big-endian architectures are not yet supported.