usr.sbin/bhyve/bhyve.8

.\" Copyright (c) 2013 Peter Grehan
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.\" $FreeBSD$
.\"
.Dd May 5, 2020
.Dt BHYVE 8
.Os
.Sh NAME
.Nm bhyve
.Nd "run a guest operating system inside a virtual machine"
.Sh SYNOPSIS
.Nm
.Op Fl AabCeHhPSuWwxY
.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
.Op Fl G Ar port
.Op Fl g Ar gdbport
.Oo Fl l
.Sm off
.Cm help | Ar lpcdev Op Cm \&, Ar conf
.Sm on
.Oc
.Oo Fl m
.Sm off
.Ar memsize
.Oo
.Cm K No | Cm k No | Cm M No | Cm m No | Cm G No | Cm g No | Cm T No | Cm t
.Oc
.Sm on
.Oc
.Op Fl p Ar vcpu Ns Cm \&: Ns Ar hostcpu
.Op Fl r Ar file
.Oo Fl s
.Sm off
.Cm help | Ar slot Cm \&, Ar emulation Op Cm \&, Ar conf
.Sm on
.Oc
.Op Fl U Ar uuid
.Ar vmname
.Sh DESCRIPTION
.Nm
is a hypervisor that runs guest operating systems inside a
virtual machine.
.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
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, it is enough to run
.Nm
with a boot ROM of choice.
.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.
The xAPIC mode is the default setting so this option is redundant.
It will be deprecated in a future version.
.It Fl A
Generate ACPI tables.
Required for
.Fx Ns /amd64
guests.
.It Fl b
Enable a low-level console device supported by
.Fx
kernels compiled with
.Cd "device bvmconsole" .
This option will be deprecated in a future version.
.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.
The current maximum number of guest virtual CPUs is 16.
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.
.It Fl C
Include guest memory in core file.
.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.
.It Fl g Ar gdbport
For
.Fx
kernels compiled with
.Cd "device bvmdebug" ,
allow a remote kernel kgdb to be relayed to the guest kernel gdb stub
via a local IPv4 address and this port.
This option will be deprecated in a future version.
.It Fl G Ar port
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 port
to listen for debugger connections.
Only a single debugger may be attached to the debug server at a time.
If
.Ar port
begins with
.Sq w ,
.Nm
will pause execution at the first instruction waiting for a debugger to attach.
.It Fl h
Print help message and exit.
.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.
.It Fl l Op Ar help|lpcdev Ns Op , Ns Ar conf
Allow devices behind the LPC PCI-ISA bridge to be configured.
The only supported devices are the TTY-class devices
.Ar com1
and
.Ar com2
and the boot ROM device
.Ar bootrom .
.Pp
.Ar help
print a list of supported LPC devices.
.It Fl m Ar memsize Ns Op Ar K|k|M|m|G|g|T|t
Guest physical memory size in bytes.
This must be the same size that was given to
.Xr bhyveload 8 .
.Pp
The size argument may be suffixed with one of K, M, G or 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
.Ar memsize
defaults to 256M.
.It Fl p Ar vcpu:hostcpu
Pin guest's virtual CPU
.Em vcpu
to
.Em hostcpu .
.It Fl P
Force the guest virtual CPU to exit when a PAUSE instruction is detected.
.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
.Op Fl s
and
.Op Fl l
options.
The count of vCPUs and memory configuration are read from the snapshot.
.It Fl s Op Ar help|slot,emulation Ns Op , 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.
.Bl -tag -width 10n
.It Ar help
print a list of supported PCI devices.
.It Ar slot
.Ar pcislot[:function]
.Ar bus:pcislot:function
.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.
.It Ar emulation
.Bl -tag -width 10n
.It Li hostbridge | Li amd_hostbridge
.Pp
Provide a simple host bridge.
This is usually configured at slot 0, and is required by most guest
operating systems.
The
.Li amd_hostbridge
emulation is identical but uses a PCI vendor ID of
.Li AMD .
.It Li passthru
PCI pass-through device.
.It Li virtio-net
Virtio network interface.
.It Li virtio-blk
Virtio block storage interface.
.It Li virtio-scsi
Virtio SCSI interface.
.It Li virtio-rnd
Virtio RNG interface.
.It Li 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 Li ahci
AHCI controller attached to arbitrary devices.
.It Li ahci-cd
AHCI controller attached to an ATAPI CD/DVD.
.It Li ahci-hd
AHCI controller attached to a SATA hard-drive.
.It Li e1000
Intel e82545 network interface.
.It Li uart
PCI 16550 serial device.
.It Li lpc
LPC PCI-ISA bridge with COM1 and COM2 16550 serial ports and a boot ROM.
The LPC bridge emulation can only be configured on bus 0.
.It Li fbuf
Raw framebuffer device attached to VNC server.
.It Li xhci
eXtensible Host Controller Interface (xHCI) USB controller.
.It Li nvme
NVM Express (NVMe) controller.
.It Li hda
High Definition Audio Controller.
.El
.It Op Ar conf
This optional parameter describes the backend for device emulations.
If
.Ar conf
is not specified, the device emulation has no backend and can be
considered unconnected.
.Pp
Network devices:
.Bl -tag -width 10n
.It Ar tapN Ns Oo , Ns Ar mac=xx:xx:xx:xx:xx:xx Oc Ns Oo , Ns Ar mtu=N Oc
.It Ar vmnetN Ns Oo , Ns Ar mac=xx:xx:xx:xx:xx:xx Oc Ns Oo , Ns Ar mtu=N Oc
.Pp
If
.Ar 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 virtio-net devices, the
.Ar mtu
parameter can be specified to inform the guest about the largest MTU
that should be allowed, expressed in bytes.
.El
.Pp
Block storage devices:
.Bl -tag -width 10n
.It Pa /filename Ns Oo , Ns Ar block-device-options Oc
.It Pa /dev/xxx Ns Oo , Ns Ar block-device-options Oc
.El
.Pp
The
.Ar block-device-options
are:
.Bl -tag -width 8n
.It Li nocache
Open the file with
.Dv O_DIRECT .
.It Li direct
Open the file using
.Dv O_SYNC .
.It Li ro
Force the file to be opened read-only.
.It Li sectorsize= Ns Ar logical Ns Oo / 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.
.El
.Pp
SCSI devices:
.Bl -tag -width 10n
.It Pa /dev/cam/ctl Ns Oo Ar pp . Ns Ar vp Oc Ns Oo , Ns Ar scsi-device-options Oc
.El
.Pp
The
.Ar scsi-device-options
are:
.Bl -tag -width 10n
.It Li iid= Ns Ar IID
Initiator ID to use when sending requests to specified CTL port.
The default value is 0.
.El
.Pp
TTY devices:
.Bl -tag -width 10n
.It Li stdio
Connect the serial port to the standard input and output of
the
.Nm
process.
.It Pa /dev/xxx
Use the host TTY device for serial port I/O.
.El
.Pp
Boot ROM device:
.Bl -tag -width 10n
.It Pa romfile
Map
.Ar romfile
in the guest address space reserved for boot firmware.
.El
.Pp
Pass-through devices:
.Bl -tag -width 10n
.It Ns Ar slot Ns / Ns Ar bus Ns / Ns Ar function
Connect to a PCI device on the host at the selector described by
.Ar slot ,
.Ar bus ,
and
.Ar function
numbers.
.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 .
.Pp
Virtio console devices:
.Bl -tag -width 10n
.It Li port1= Ns Pa /path/to/port1.sock Ns ,anotherport= Ns Pa ...
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 -offset 2n
.It
Due to 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 "console port" feature, nor the console port
resize at present.
.It
Emergency write is advertised, but no-op at present.
.El
.El
.Pp
Framebuffer devices:
.Bl -tag -width 10n
.It Xo
.Oo rfb= Ns Oo Ar IP\&: Oc Ns Ar port Oc Ns Oo ,w= Ns Ar width Oc Ns Oo ,h= Ns
.Ar height Oc Ns Oo ,vga= Ns Ar vgaconf Oc Ns Oo Ns ,wait Oc Ns Oo ,password= Ns
.Ar password Oc
.Xc
.Bl -tag -width 8n
.It Ar IPv4:port No or Ar [IPv6%zone]:port
An
.Ar IP
address and a
.Ar port
VNC should listen on.
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 Ar width No and 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 1920x1200 pixels.
.It Ar vgaconf
Possible values for this option are
.Dq io
(default),
.Dq on
, and
.Dq 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
.Dq 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
.Dq 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
.Dq 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 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 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
.El
.Pp
xHCI USB devices:
.Bl -tag -width 10n
.It Li tablet
A USB tablet device which provides precise cursor synchronization
when using VNC.
.El
.Pp
NVMe devices:
.Bl -tag -width 10n
.It Li devpath
Accepted device paths are:
.Ar /dev/blockdev
or
.Ar /path/to/image
or
.Ar ram=size_in_MiB .
.It Li maxq
Max number of queues.
.It Li qsz
Max elements in each queue.
.It Li ioslots
Max number of concurrent I/O requests.
.It Li sectsz
Sector size (defaults to blockif sector size).
.It Li ser
Serial number with maximum 20 characters.
.El
.Pp
HD Audio devices:
.Bl -tag -width 10n
.It Li play
Playback device, typically
.Ar /dev/dsp0 .
.It Li rec
Recording device, typically
.Ar /dev/dsp0 .
.El
.El
.It Fl S
Wire guest memory.
.It Fl u
RTC keeps UTC time.
.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 w
Ignore accesses to unimplemented Model Specific Registers (MSRs).
This is intended for debug purposes.
.It Fl W
Force virtio PCI device emulations to use MSI interrupts instead of MSI-X
interrupts.
.It Fl x
The guest's local APIC is configured in x2APIC mode.
.It Fl Y
Disable MPtable generation.
.It Ar vmname
Alphanumeric name of the guest.
This should be the same as that created by
.Xr bhyveload 8 .
.El
.Sh DEBUG SERVER
The current debug server provides limited support for debuggers.
.Ss Registers
Each virtual CPU is exposed to the debugger as a thread.
.Pp
General purpose registers can be queried for each virtual CPU, but other
registers such as floating-point and system registers cannot be queried.
.Ss Memory
Memory (including memory mapped I/O regions) can be read and written by the debugger.
Memory operations use virtual addresses that are resolved to physical addresses
via the current virtual CPU's active address translation.
.Ss Control
The running guest can be interrupted by the debugger at any time
.Pq for example, by pressing Ctrl-C in the debugger .
.Pp
Single stepping is only supported on Intel CPUs supporting the MTRAP VM exit.
.Pp
Breakpoints are supported on Intel CPUs that support single stepping.
Note that continuing from a breakpoint while interrupts are enabled in the
guest may not work as expected due to timer interrupts firing while single
stepping over the breakpoint.
.Sh SIGNAL HANDLING
.Nm
deals with the following signals:
.Pp
.Bl -tag -width indent -compact
.It SIGTERM
Trigger ACPI poweroff for a VM
.El
.Sh EXIT STATUS
Exit status indicates how the VM was terminated:
.Pp
.Bl -tag -width indent -compact
.It 0
rebooted
.It 1
powered off
.It 2
halted
.It 3
triple fault
.It 4
exited due to an error
.El
.Sh EXAMPLES
If not using a boot ROM, the guest operating system must have been loaded with
.Xr bhyveload 8
or a similar boot loader before
.Xr bhyve 4
can be run.
Otherwise, the boot loader is not needed.
.Pp
To run a virtual machine with 1GB of memory, two virtual CPUs, a virtio
block device backed by the
.Pa /my/image
filesystem image, and a serial port for the console:
.Bd -literal -offset indent
bhyve -c 2 -s 0,hostbridge -s 1,lpc -s 2,virtio-blk,/my/image \\
  -l com1,stdio -A -H -P -m 1G vm1
.Ed
.Pp
Run a 24GB single-CPU virtual machine with three network ports, one of which
has a MAC address specified:
.Bd -literal -offset indent
bhyve -s 0,hostbridge -s 1,lpc -s 2:0,virtio-net,tap0 \\
  -s 2:1,virtio-net,tap1 \\
  -s 2:2,virtio-net,tap2,mac=00:be:fa:76:45:00 \\
  -s 3,virtio-blk,/my/image -l com1,stdio \\
  -A -H -P -m 24G bigvm
.Ed
.Pp
Run an 8GB quad-CPU virtual machine with 8 AHCI SATA disks, an AHCI ATAPI
CD-ROM, a single virtio network port, an AMD hostbridge, and the console
port connected to an
.Xr nmdm 4
null-modem device.
.Bd -literal -offset indent
bhyve -c 4 \\
  -s 0,amd_hostbridge -s 1,lpc \\
  -s 1:0,ahci,hd:/images/disk.1,hd:/images/disk.2,\\
hd:/images/disk.3,hd:/images/disk.4,\\
hd:/images/disk.5,hd:/images/disk.6,\\
hd:/images/disk.7,hd:/images/disk.8,\\
cd:/images/install.iso \\
  -s 3,virtio-net,tap0 \\
  -l com1,/dev/nmdm0A \\
  -A -H -P -m 8G
.Ed
.Pp
Run a UEFI virtual machine with a display resolution of 800 by 600 pixels
that can be accessed via VNC at: 0.0.0.0:5900.
.Bd -literal -offset indent
bhyve -c 2 -m 4G -w -H \\
  -s 0,hostbridge \\
  -s 3,ahci-cd,/path/to/uefi-OS-install.iso \\
  -s 4,ahci-hd,disk.img \\
  -s 5,virtio-net,tap0 \\
  -s 29,fbuf,tcp=0.0.0.0:5900,w=800,h=600,wait \\
  -s 30,xhci,tablet \\
  -s 31,lpc -l com1,stdio \\
  -l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd \\
   uefivm
.Ed
.Pp
Run a UEFI virtual machine with a VNC display that is bound to all IPv6
addresses on port 5900.
.Bd -literal -offset indent
bhyve -c 2 -m 4G -w -H \\
  -s 0,hostbridge \\
  -s 4,ahci-hd,disk.img \\
  -s 5,virtio-net,tap0 \\
  -s 29,fbuf,tcp=[::]:5900,w=800,h=600 \\
  -s 30,xhci,tablet \\
  -s 31,lpc -l com1,stdio \\
  -l bootrom,/usr/local/share/uefi-firmware/BHYVE_UEFI.fd \\
   uefivm
.Ed
.Sh SEE ALSO
.Xr bhyve 4 ,
.Xr nmdm 4 ,
.Xr vmm 4 ,
.Xr ethers 5 ,
.Xr bhyvectl 8 ,
.Xr bhyveload 8
.Pp
.Rs
.%A Intel
.%B 64 and IA-32 Architectures Software Developer’s Manual
.%V Volume 3
.Re
.Sh HISTORY
.Nm
first appeared in
.Fx 10.0 .
.Sh AUTHORS
.An Neel Natu Aq Mt neel@freebsd.org
.An Peter Grehan Aq Mt grehan@freebsd.org