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.\" Copyright (c) 2013 Peter Grehan
.\" All rights reserved.
.\"
.\" 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 AUTHORS 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 AUTHORS 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 August 21, 2024
.Dt BHYVE 8
.Os
.Sh NAME
.Nm bhyve
.Nd "run a guest operating system inside a virtual machine"
.Sh SYNOPSIS
.Nm
.Op Fl aCDeHhPqSuWwxY
.Oo
.Sm off
.Fl c\~
.Oo
.Op Cm cpus=
.Ar numcpus
.Oc
.Op Cm ,sockets= Ar n
.Op Cm ,cores= Ar n
.Op Cm ,threads= Ar n
.Oc
.Sm on
.Oo Fl f
.Sm off
.Ar name Cm \&,
.Oo
.Cm string No | Cm file
.Oc
.Cm \&= Ar data
.Sm on
.Oc
.Oo
.Sm off
.Fl G\~
.Oo Ar w Oc
.Oo Ar bind_address Cm \&: Oc
.Ar port
.Sm on
.Oc
.Op Fl k Ar config_file
.Op Fl K Ar layout
.Oo Fl l
.Sm off
.Ar lpcdev Op Cm \&, Ar conf
.Sm on
.Oc
.Sm off
.Oo Fl m\~
.Ar memsize
.Oo
.Cm K | Cm k | Cm M | Cm m | Cm G | Cm g | Cm T | Cm t
.Oc
.Sm on
.Oc
.Op Fl o Ar var Ns Cm = Ns Ar value
.Op Fl p Ar vcpu Ns Cm \&: Ns Ar hostcpu
.Op Fl r Ar file
.Sm off
.Oo Fl s\~
.Ar slot Cm \&, Ar emulation Op Cm \&, Ar conf
.Sm on
.Oc
.Op Fl U Ar uuid
.Ar vmname
.Nm
.Fl l Cm help
.Nm
.Fl s Cm help
.Sh DESCRIPTION
.Nm
is a hypervisor that runs guest operating systems inside a
virtual machine.
It can run guests on amd64 and arm64 platforms with suitable hardware support.
.Pp
Parameters such as the number of virtual CPUs, amount of guest memory, and
I/O connectivity can be specified with command-line parameters.
.Pp
.Nm
is typically used with a boot ROM that can load the guest operating system.
On arm64 platforms, this is currently required.
If not using a boot ROM, the guest operating system must be loaded with
.Xr bhyveload 8
or a similar boot loader before running
.Nm ,
otherwise.
On amd64, the
.Pa edk2-bhyve
package provides a UEFI firmware that can be used to boot the guest;
on arm64 the
.Pa u-boot-bhyve-arm64
package provides a U-Boot image that can be used to boot the guest.
.Pp
.Nm
runs until the guest operating system reboots or an unhandled hypervisor
exit is detected.
.Sh OPTIONS
.Bl -tag -width 10n
.It Fl a
The guest's local APIC is configured in xAPIC mode.
This option only applies to the amd64 platform.
xAPIC mode is the default setting so this option is redundant.
It will be deprecated in a future version.
.It Fl C
Include guest memory in core files.
.It Fl c Op Ar setting ...
Number of guest virtual CPUs
and/or the CPU topology.
The default value for each of
.Ar numcpus ,
.Ar sockets ,
.Ar cores ,
and
.Ar threads
is 1.
If
.Ar numcpus
is not specified then it will be calculated from the other arguments.
The topology must be consistent in that the
.Ar numcpus
must equal the product of
.Ar sockets ,
.Ar cores ,
and
.Ar threads .
If a
.Ar setting
is specified more than once the last one has precedence.
.Pp
The maximum number of virtual CPUs defaults to the number of active
physical CPUs in the system available via the
.Va hw.vmm.maxcpu
.Xr sysctl 8
variable.
The limit can be adjusted via the
.Va hw.vmm.maxcpu
loader tunable.
.It Fl D
Destroy the VM on guest initiated power-off.
.It Fl e
Force
.Nm
to exit when a guest issues an access to an I/O port that is not emulated.
This is intended for debug purposes and only applies to the amd64 platform.
.It Fl f Ar name Ns Cm \&, Ns Oo Cm string Ns No | Ns Cm file Ns Oc Ns Cm \&= Ns Ar data
Add a fw_cfg file
.Ar name
to the fw_cfg interface.
If a
.Cm string
is specified, the fw_cfg file contains the string as data.
If a
.Cm file
is specified, bhyve reads the file and adds the file content as fw_cfg data.
.It Fl G Xo
.Sm off
.Oo Ar w Oc
.Oo Ar bind_address Cm \&: Oc
.Ar port
.Sm on
.Xc
Start a debug server that uses the GDB protocol to export guest state to a
debugger.
An IPv4 TCP socket will be bound to the supplied
.Ar bind_address
and
.Ar port
to listen for debugger connections.
Only a single debugger may be attached to the debug server at a time.
If the option begins with
.Sq w ,
.Nm
will pause execution at the first instruction waiting for a debugger to attach.
.It Fl H
Yield the virtual CPU thread when a HLT instruction is detected.
If this option is not specified, virtual CPUs will use 100% of a host CPU.
This option applies only to the amd64 platform.
.It Fl h
Print help message and exit.
.It Fl k Ar config_file
Set configuration variables from a simple, key-value config file.
Each line of the config file is expected to consist of a config variable
name, an equals sign
.Pq Sq = ,
and a value.
No spaces are permitted between the variable name, equals sign, or
value.
Blank lines and lines starting with
.Sq #
are ignored.
See
.Xr bhyve_config 5
for more details.
.It Fl K Ar layout
Specify the keyboard layout.
The value that can be specified sets the file name in
.Ar /usr/share/bhyve/kbdlayout .
This specification only works when loaded with UEFI mode for VNC.
When using a VNC client that supports QEMU Extended Key Event Message (e.g.
TigerVNC), this option isn't needed.
When using a VNC client that doesn't support QEMU Extended Key Event Message
(e.g. tightVNC), the layout defaults to the US keyboard unless specified
otherwise.
.It Fl l Cm help
Print a list of supported LPC devices.
.It Fl l Ar lpcdev Ns Op Cm \&, Ns Ar conf
Allow devices behind the LPC PCI-ISA bridge to be configured.
The only supported devices are the TTY-class devices
.Cm com1 , com2 , com3 ,
and
.Cm com4 ,
the TPM module
.Cm tpm ,
the boot ROM device
.Cm bootrom ,
the
.Cm fwcfg
type and the debug/test device
.Cm pc-testdev .
.Pp
The possible values for the
.Ar conf
argument are listed in the
.Fl s
flag description.
.Pp
This option applies only to the amd64 platform.
On arm64, the console and boot ROM devices are configured using the
more generic
.Fl o
option.
.It Xo
.Fl m Ar memsize Ns Oo
.Sm off
.Cm K | k | M | m | G | g | T | t
.Sm on
.Oc
.Xc
Set the guest physical memory size.
This must be the same size that was given to
.Xr bhyveload 8 .
.Pp
The size argument may be suffixed with one of
.Cm K , M , G
or
.Cm T
(either upper or lower case)
to indicate a multiple of kilobytes, megabytes, gigabytes, or terabytes.
If no suffix is given, the value is assumed to be in megabytes.
.Pp
The default is 256M.
.It Fl o Ar var Ns Cm = Ns Ar value
Set the configuration variable
.Ar var
to
.Ar value .
See
.Xr bhyve_config 5
for configuration options.
.It Fl P
Force the guest virtual CPU to exit when a PAUSE instruction is detected.
This option applies only to the amd64 platform.
.It Fl p Ar vcpu Ns Cm \& : Ns Ar hostcpu
Pin guest's virtual CPU
.Em vcpu
to
.Em hostcpu .
Host CPUs and guest virtual CPUs are numbered starting from 0.
A
.Fl p
option is required for every guest vCPU to be pinned.
To map a 4 vCPU guest to host CPUs 12-15:
.Bd -literal
-p 0:12 -p 1:13 -p 2:14 -p 3:15
.Ed
.It Fl q
Disable verbose MSR (Model-Specific Register) print out.
When this option is enabled, bhyve will suppress messages related to reading
from (rdmsr) and writing to (wrmsr) MSRs on virtual CPUs.
This can be useful for reducing log verbosity and preventing the VM console
from being spammed with informational messages, particularly in environments
where such messages are not needed for diagnostic purposes.
.It Fl r Ar file
Resume a guest from a snapshot.
The guest memory contents are restored from
.Ar file ,
and the guest device and vCPU state are restored from the file
.Dq Ar file Ns .kern .
.Pp
Note that the current snapshot file format requires that the
configuration of devices in the new VM match the VM from which the
snapshot was taken by specifying the same
.Fl s
and
.Fl l
options.
The count of vCPUs and memory configuration are read from the snapshot.
.It Fl S
Wire guest memory.
.It Fl s Cm help
Print a list of supported PCI devices.
.It Fl s Ar slot Ns Cm \&, Ns Ar emulation Ns Op Cm \&, Ns Ar conf
Configure a virtual PCI slot and function.
.Pp
.Nm
provides PCI bus emulation and virtual devices that can be attached to
slots on the bus.
There are 32 available slots, with the option of providing up to 8 functions
per slot.
.Pp
The
.Ar slot
can be specified in one of the following formats:
.Pp
.Bl -bullet -compact
.It
.Ar pcislot
.It
.Sm off
.Ar pcislot Cm \&: Ar function
.Sm on
.It
.Sm off
.Ar bus Cm \&: Ar pcislot Cm \&: Ar function
.Sm on
.El
.Pp
The
.Ar pcislot
value is 0 to 31.
The optional
.Ar function
value is 0 to 7.
The optional
.Ar bus
value is 0 to 255.
If not specified, the
.Ar function
value defaults to 0.
If not specified, the
.Ar bus
value defaults to 0.
.Pp
See
.Sx "PCI EMULATION"
for available options for the
.Ar emulation
argument.
.It Fl U Ar uuid
Set the universally unique identifier
.Pq UUID
in the guest's System Management BIOS System Information structure.
By default a UUID is generated from the host's hostname and
.Ar vmname .
.It Fl u
RTC keeps UTC time.
.It Fl W
Force virtio PCI device emulations to use MSI interrupts instead of MSI-X
interrupts.
.It Fl w
Ignore accesses to unimplemented Model Specific Registers (MSRs).
This is intended for debug purposes.
.It Fl x
The guest's local APIC is configured in x2APIC mode.
This option applies only to the amd64 platform.
.It Fl Y
Disable MPtable generation.
This option applies only to the amd64 platform.
.It Ar vmname
Alphanumeric name of the guest.
This should be the same as that created by
.Xr bhyveload 8 .
.El
.Sh PCI EMULATION
.Nm
provides emulation for various PCI devices.
They are specified by the
.Fl s
.Ar slot,emulation,conf
configuration's
.Ar emulation
argument, which can be one of the following:
.Bl -tag -width "amd_hostbridge"
.It Cm hostbridge
A simple host bridge.
This is usually configured at slot 0, and is required by most guest
operating systems.
.It Cm amd_hostbridge
Emulation identical to
.Cm hostbridge
using a PCI vendor ID of AMD.
.It Cm passthru
PCI pass-through device.
.It Cm virtio-net
Virtio network interface.
.It Cm virtio-blk
Virtio block storage interface.
.It Cm virtio-scsi
Virtio SCSI interface.
.It Cm virtio-9p
Virtio 9p (VirtFS) interface.
.It Cm virtio-rnd
Virtio RNG interface.
.It Cm virtio-console
Virtio console interface, which exposes multiple ports
to the guest in the form of simple char devices for simple IO
between the guest and host userspaces.
.It Cm virtio-input
Virtio input interface.
.It Cm ahci
AHCI controller attached to arbitrary devices.
.It Cm ahci-cd
AHCI controller attached to an ATAPI CD/DVD.
.It Cm ahci-hd
AHCI controller attached to a SATA hard drive.
.It Cm e1000
Intel e82545 network interface.
.It Cm uart
PCI 16550 serial device.
.It Cm lpc
LPC PCI-ISA bridge with COM1, COM2, COM3, and COM4 16550 serial ports,
a boot ROM, and,
optionally, a TPM module, a fwcfg type, and the debug/test device.
The LPC bridge emulation can only be configured on bus 0.
.It Cm fbuf
Raw framebuffer device attached to VNC server.
.It Cm xhci
eXtensible Host Controller Interface (xHCI) USB controller.
.It Cm nvme
NVM Express (NVMe) controller.
.It Cm hda
High Definition Audio Controller.
.El
.Pp
The optional parameter
.Ar conf
describes the backend for device emulations.
If
.Ar conf
is not specified, the device emulation has no backend and can be
considered unconnected.
.Ss Network device backends
.Sm off
.Bl -bullet
.It
.Xo
.Cm tap Ar N
.Op Cm \&,mac= Ar xx:xx:xx:xx:xx:xx
.Op Cm \&,mtu= Ar N
.Xc
.It
.Xo
.Cm vmnet Ar N
.Op Cm \&,mac= Ar xx:xx:xx:xx:xx:xx
.Op Cm \&,mtu= Ar N
.Xc
.It
.Xo
.Cm netgraph,path= Ar ADDRESS Cm \&,peerhook= Ar HOOK
.Op Cm \&,socket= Ar NAME
.Op Cm \&,hook= Ar HOOK
.Op Cm \&,mac= Ar xx:xx:xx:xx:xx:xx
.Op Cm \&,mtu= Ar N
.Xc
.It
.Xo
.Cm slirp,hostfwd= Ar proto : Ar hostaddr : Ar hostport - Ar guestaddr : Ar guestport
.Xc
.El
.Sm on
.Pp
If
.Cm mac
is not specified, the MAC address is derived from a fixed OUI, and the
remaining bytes from an MD5 hash of the slot and function numbers and
the device name.
.Pp
The MAC address is an ASCII string in
.Xr ethers 5
format.
.Pp
With
.Cm virtio-net
devices, the
.Cm mtu
parameter can be specified to inform the guest about the largest MTU
that should be allowed, expressed in bytes.
.Pp
With
.Cm netgraph
backend, the
.Cm path
and
.Cm peerhook
parameters must be specified to set the destination node and corresponding hook.
The optional parameters
.Cm socket
and
.Cm hook
may be used to set the
.Xr ng_socket 4
node name and source hook.
The
.Ar ADDRESS ,
.Ar HOOK ,
and
.Ar NAME
must comply with
.Xr netgraph 4
addressing rules.
.Pp
The slirp backend can be used to provide a NATed network to the guest.
This backend has poor performance but does not require any network
configuration on the host system.
It depends on the
.Pa net/libslirp
port.
The
.Cm hostfwd
option takes a 5-tuple describing how connections from the host are to be
forwarded to the guest.
Multiple rules can be specified, separated by semicolons.
Note that semicolons must be escaped or quoted to prevent the shell from
interpreting them.
.Ss Block storage device backends:
.Bl -bullet
.Sm off
.It
.Ar /filename Op Cm \&, Ar block-device-options
.It
.Ar /dev/xxx Op Cm \&, Ar block-device-options
.Sm on
.El
.Pp
The
.Ar block-device-options
are:
.Bl -tag -width 10n
.It Cm nocache
Open the file with
.Dv O_DIRECT .
.It Cm direct
Open the file using
.Dv O_SYNC .
.It Cm ro
Force the file to be opened read-only.
.It Cm sectorsize= Ns Ar logical Ns Oo Cm \&/ Ns Ar physical Oc
Specify the logical and physical sector sizes of the emulated disk.
The physical sector size is optional and is equal to the logical sector size
if not explicitly specified.
.It Cm nodelete
Disable emulation of guest trim requests via
.Dv DIOCGDELETE
requests.
.It Li bootindex= Ns Ar index
Add the device to the bootorder at
.Ar index .
A fwcfg file is used to specify the bootorder.
The guest firmware may ignore or doesn't support this fwcfg file.
In that case, this feature doesn't work as expected.
.El
.Ss SCSI device backends
.Bl -bullet
.Sm off
.It
.Pa /dev/cam/ctl Oo Ar pp Cm \&. Ar vp Oc Oo Cm \&, Ar scsi-device-options Oc
.Sm on
.El
.Pp
The
.Ar scsi-device-options
are:
.Bl -tag -width 10n
.It Cm iid= Ns Ar IID
Initiator ID to use when sending requests to specified CTL port.
The default value is 0.
.It Li bootindex= Ns Ar index
Add the device to the bootorder at
.Ar index .
A fwcfg file is used to specify the bootorder.
The guest firmware may ignore or doesn't support this fwcfg file.
In that case, this feature doesn't work as expected.
.El
.Ss 9P device backends
.Bl -bullet
.Sm off
.It
.Ar sharename Cm = Ar /path/to/share Op Cm \&, Ar 9p-device-options
.Sm on
.El
.Pp
The
.Ar 9p-device-options
are:
.Bl -tag -width 10n
.It Cm ro
Expose the share in read-only mode.
.El
.Ss TTY device backends
.Bl -tag -width 10n
.It Cm stdio
Connect the serial port to the standard input and output of
the
.Nm
process.
.It Ar /dev/xxx
Use the host TTY device for serial port I/O.
.It Ar tcp=ip:port
Use the TCP server for serial port I/O.
Configuring this option will start a TCP server that waits for connections.
Only one connection is allowed at any time. Other connection try to connect
to TCP server will be disconnected immediately. Note that this feature
allows unprivileged users to access the guest console, so ensure that
access is appropriately restricted.
.El
.Ss TPM device backends
.Bl -bullet
.Sm off
.It
.Ar type Ns \&, Ns Ar path Ns Op Cm \&, Ns Ar tpm-device-options
.Sm on
.El
.Pp
Emulate a TPM device.
Supported options for
.Ar type :
.Bl -tag -width 10n
.It Cm passthru
Use a physical TPM device.
The argument
.Ar path
needs to point to a valid TPM device path, i.e.
.Pa /dev/tpm0 .
.It Cm swtpm
Connect to a running
.Cm swtpm
instance.
The argument
.Ar path
needs to point to a UNIX domain socket that a
.Cm swtpm
process is listening on.
.El
.Pp
The
.Ar tpm-device-options
are:
.Bl -tag -width 10n
.It Cm version= Ns Ar version
Version of the TPM device according to the TCG specification.
Defaults to
.Cm 2.0 ,
which is the only version currently supported.
.El
.Ss Boot ROM device backends
.Sm off
.Bl -bullet
.It
.Ar romfile Ns Op Cm \&, Ns Ar varfile
.El
.Sm on
.Pp
Map
.Ar romfile
in the guest address space reserved for boot firmware.
.Pp
If
.Ar varfile
is provided, that file is also mapped in the boot firmware guest
address space, and any modifications the guest makes will be saved
to that file.
.Pp
Fwcfg types:
.Bl -tag -width 10n
.It Ar fwcfg
The fwcfg interface is used to pass information such as the CPU count
or ACPI tables to the guest firmware.
Supported values are
.Ql bhyve
and
.Ql qemu .
Due to backward compatibility reasons,
.Ql bhyve
is the default option.
When
.Ql bhyve
is used, bhyve's fwctl interface is used.
It currently reports only the CPU count to the guest firmware.
The
.Ql qemu
option uses QEMU's fwcfg interface.
This interface is widely used and allows user-defined information to
be passed to the guest.
It is used for passing the CPU count, ACPI tables, a boot order and
many other things to the guest.
Some operating systems such as Fedora CoreOS can be configured by
qemu's fwcfg interface as well.
.El
.Ss Pass-through device backends
.Sm off
.Bl -bullet
.It
.Cm ppt Ar N Oo , Ar passthru-device-options Oc
.It
.Ns Ar bus Cm \&/ Ar slot Cm \&/ Ar function
.Op , Ar passthru-device-options
.It
.Cm pci Ar bus Cm : Ar slot Cm : Ns Ar function
.Op , Ar passthru-device-options
.El
.Sm on
.Pp
Connect to a PCI device on the host either named ppt
.Ns Ar N
or at the selector described by
.Ar slot ,
.Ar bus ,
and
.Ar function
numbers.
.Pp
The
.Ar passthru-device-options
are:
.Bl -tag -width 10n
.It Cm rom= Ns Ar romfile
Add
.Ar romfile
as option ROM to the PCI device.
The ROM will be loaded by firmware and should be capable of
initializing the device.
.It Li bootindex= Ns Ar index
Add the device to the bootorder at
.Ar index .
A fwcfg file is used to specify the bootorder.
The guest firmware may ignore or doesn't support this fwcfg file.
In that case, this feature doesn't work as expected.
.El
.Pp
Guest memory must be wired using the
.Fl S
option when a pass-through device is configured.
.Pp
The host device must have been reserved at boot-time using the
.Va pptdevs
loader variable as described in
.Xr vmm 4 .
.Ss Virtio console device backends
.Bl -bullet
.Sm off
.It
.Cm port1= Ns Ar /path/to/port1.sock Ns Op Cm ,port Ns Ar N Cm \&= Ns Ar /path/to/port2.sock No \~ Ar ...
.Sm on
.El
.Pp
A maximum of 16 ports per device can be created.
Every port is named and corresponds to a Unix domain socket created by
.Nm .
.Nm
accepts at most one connection per port at a time.
.Pp
Limitations:
.Bl -bullet
.It
Due to the lack of destructors in
.Nm ,
sockets on the filesystem must be cleaned up manually after
.Nm
exits.
.It
There is no way to use the
.Dq console port
feature, nor the console port
resize at present.
.It
Emergency write is advertised, but no-op at present.
.El
.Ss Virtio input device backends:
.Bl -bullet
.Sm off
.It
.Ar /dev/input/eventX
.Sm on
.El
.Pp
Send input events of
.Ar /dev/input/eventX
to guest by VirtIO Input Interface.
.Ss Framebuffer device backends
.Bl -bullet
.Sm off
.It
.Op Cm rfb= Ar ip-and-port
.Op Cm ,w= Ar width
.Op Cm ,h= Ar height
.Op Cm ,vga= Ar vgaconf
.Op Cm ,wait
.Op Cm ,password= Ar password
.Sm on
.El
.Pp
Configuration options are defined as follows:
.Bl -tag -width 10n
.It Cm rfb= Ns Ar ip-and-port Pq or Cm tcp= Ns Ar ip-and-port
An IP address and a port VNC should listen on.
There are two formats:
.Pp
.Bl -bullet -compact
.It
.Sm off
.Op Ar IPv4 Cm \&:
.Ar port
.Sm on
.It
.Sm off
.Cm \&[ Ar IPv6%zone Cm \&] Cm \&: Ar port
.Sm on
.El
.Pp
The default is to listen on localhost IPv4 address and default VNC port 5900.
An IPv6 address must be enclosed in square brackets and may contain an
optional zone identifier.
.It Cm w= Ns Ar width No and Cm h= Ns Ar height
A display resolution, width and height, respectively.
If not specified, a default resolution of 1024x768 pixels will be used.
Minimal supported resolution is 640x480 pixels,
and maximum is 3840x2160 pixels.
.It Cm vga= Ns Ar vgaconf
Possible values for this option are
.Cm io
(default),
.Cm on ,
and
.Cm off .
PCI graphics cards have a dual personality in that they are
standard PCI devices with BAR addressing, but may also
implicitly decode legacy VGA I/O space
.Pq Ad 0x3c0-3df
and memory space
.Pq 64KB at Ad 0xA0000 .
The default
.Cm io
option should be used for guests that attempt to issue BIOS calls which result
in I/O port queries, and fail to boot if I/O decode is disabled.
.Pp
The
.Cm on
option should be used along with the CSM BIOS capability in UEFI
to boot traditional BIOS guests that require the legacy VGA I/O and
memory regions to be available.
.Pp
The
.Cm off
option should be used for the UEFI guests that assume that
VGA adapter is present if they detect the I/O ports.
An example of such a guest is
.Ox
in UEFI mode.
.Pp
Please refer to the
.Nm
.Fx
wiki page
.Pq Lk https://wiki.freebsd.org/bhyve
for configuration notes of particular guests.
.It Cm wait
Instruct
.Nm
to only boot upon the initiation of a VNC connection, simplifying the
installation of operating systems that require immediate keyboard input.
This can be removed for post-installation use.
.It Cm password= Ns Ar password
This type of authentication is known to be cryptographically weak and is not
intended for use on untrusted networks.
Many implementations will want to use stronger security, such as running
the session over an encrypted channel provided by IPsec or SSH.
.El
.Ss xHCI USB device backends
.Bl -bullet
.Sm off
.It
.Ar tablet
.Sm on
.El
.Pp
A USB tablet device that provides precise cursor synchronization
when using VNC.
.Ss NVMe device backends
.Bl -bullet
.Sm off
.It
.Ar devpath
.Op Cm ,maxq= Ar #
.Op Cm ,qsz= Ar #
.Op Cm ,ioslots= Ar #
.Op Cm ,sectsz= Ar #
.Op Cm ,ser= Ar #
.Op Cm ,eui64= Ar #
.Op Cm ,dsm= Ar opt
.Sm on
.El
.Pp
Configuration options are defined as follows:
.Bl -tag -width 10n
.It Ar devpath
Accepted device paths are:
.Ar /dev/blockdev
or
.Ar /path/to/image
or
.Cm ram= Ns Ar size_in_MiB .
.It Cm maxq
Max number of queues.
.It Cm qsz
Max elements in each queue.
.It Cm ioslots
Max number of concurrent I/O requests.
.It Cm sectsz
Sector size (defaults to blockif sector size).
.It Cm ser
Serial number with maximum 20 characters.
.It Cm eui64
IEEE Extended Unique Identifier (8 byte value).
.It Cm dsm
DataSet Management support.
Supported values are:
.Cm auto , enable ,
and
.Cm disable .
.El
.Ss AHCI device backends
.Bl -bullet
.It
.Sm off
.Op Oo Cm hd\&: | cd\&: Oc Ar path
.Op Cm ,nmrr= Ar nmrr
.Op Cm ,ser= Ar #
.Op Cm ,rev= Ar #
.Op Cm ,model= Ar #
.Sm on
.El
.Pp
Configuration options are defined as follows:
.Bl -tag -width 10n
.It Cm nmrr
Nominal Media Rotation Rate, known as RPM.
Value 1 will indicate device as Solid State Disk.
Default value is 0, not report.
.It Cm ser
Serial Number with maximum 20 characters.
.It Cm rev
Revision Number with maximum 8 characters.
.It Cm model
Model Number with maximum 40 characters.
.El
.Ss HD Audio device backends
.Bl -bullet
.It
.Sm off
.Op Cm play= Ar playback
.Op Cm ,rec= Ar recording
.Sm on
.El
.Pp
Configuration options are defined as follows:
.Bl -tag -width 10n
.It Cm play
Playback device, typically
.Ar /dev/dsp0 .
.It Cm rec
Recording device, typically
.Ar /dev/dsp0 .
.El
.Sh CONFIGURATION VARIABLES
.Nm
uses an internal tree of configuration variables to describe global and
per-device settings.
When