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+.\"-
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
+.\" Copyright (c) 2021 Alexander Motin <mav@FreeBSD.org>
+.\" Copyright 2019 Cisco Systems, Inc.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.Dd October 6, 2022
+.Dt VMD 4
+.Os
+.Sh NAME
+.Nm vmd
+.Nd Intel Volume Management Device driver
+.Sh SYNOPSIS
+To compile this driver into the kernel, place the following lines in your
+kernel configuration file:
+.Bd -ragged -offset indent
+.Cd "device vmd"
+.Ed
+.Pp
+Alternatively, to load the driver as a module at boot time, place the following
+line in
+.Xr loader.conf 5 :
+.Bd -literal -offset indent
+vmd_load="YES"
+.Ed
+.Sh DESCRIPTION
+This driver attaches to Intel VMD devices, representing them as PCI-to-PCI
+bridges and providing access to children PCI devices via new PCI domains.
+Intel VMD is used by Intel's VROC (Virtual RAID on chip) to manage NVMe
+drives.
+.Sh LOADER TUNABLES
+The following tunables are settable via
+.Xr loader 8
+or
+.Xr sysctl 8 :
+.Bl -tag -width indent
+.It Va hw.vmd.bypass_msi
+By default all VMD devices remap children MSI/MSI-X interrupts into their
+own.  It creates additional isolation, but also complicates things due to
+sharing, etc.  Fortunately some VMD devices can bypass the remapping.
+Defaults to 1.
+.It Va hw.vmd.max_msi
+Limits number of Message Signaled Interrupt (MSI) vectors allowed to each
+child device.
+VMD can't distinguish MSI vectors of the same device, so there are no
+benefits to have more than one, unless it is required by specific device
+driver.
+Defaults to 1.
+.It Va hw.vmd.max_msix
+Limits number of Extended Message Signaled Interrupt (MSI-X) vectors
+allowed to each child device.
+VMD has limited number of interrupt vectors to map children interrupts into,
+so to avoid/reduce sharing children devices/drivers need to be constrained.
+Defaults to 3.
+.El
+.Sh SEE ALSO
+.Xr graid 8
+.Sh HISTORY
+The
+.Nm
+driver first appeared in
+.Fx 13.0 .