add vmx documentation
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109
sys/man/1/vmx
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109
sys/man/1/vmx
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.TH VMX 1
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.SH NAME
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vmx \- virtual PC
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.SH SYNOPSIS
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.B vmx
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[
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.B -M
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.I mem
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]
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[
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.B -c
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.I com1
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]
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[
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.B -C
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.I com2
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]
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[
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.B -n
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.I nic
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]
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[
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.B -d
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.I blockfile
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]
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[
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.B -v
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.I vga
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]
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[
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.B -m
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.I bootmod
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]
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kernel
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[
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.I args ...
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]
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.SH DESCRIPTION
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.I Vmx
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uses Intel VT-x through
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.IR vmx (3)
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to simulate a virtual PC, running the specified kernel (which must be Multiboot compliant).
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.PP
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By default the virtual PC has 64 MB of memory.
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The amount of memory can be changed with the
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.B -M
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option,
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the argument of which is interpreted in bytes unless suffixed by
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.BR K ,
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.BR M ,
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or
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.B G
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to change the unit to kilobytes, megabytes or gigabytes, respectively.
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.PP
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.I Args
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is passed to the kernel as its command line.
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Boot modules can be specified with the
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.B -m
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argument.
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.PP
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If
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.B -v
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is specified, a graphics device is simulated.
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The argument to
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.B -v
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is either
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.IR text,
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which simulates a CGA text-mode console, or
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"\fIwidth\fLx\fIheight\fLx\fIchan\fL@\fIaddr\fR",
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which simulates a framebuffer at address \fIaddr\fR of the specified size and channel format \fIchan\fR (see
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.IR image (6)).
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.PP
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The
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.B -c
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and
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.B -C
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options specify the targets for the COM1 and COM2 devices.
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The argument consists of two fields separated by a comma, which specify the file to be used for input and output, respectively.
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Either field can be left empty.
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If there is no comma in the argument, the same value is used for both fields.
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.PP
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A
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.B -n
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option adds a network card.
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The argument to
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.B -n
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specifies a physical network device (such as
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.BR ether0 )
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to use.
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.PP
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A
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.B -d
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option adds a
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.I virtio
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block device (a hard disk)
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with the argument as a disk image.
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.SH SOURCE
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.B /sys/src/cmd/vmx
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.SH SEE ALSO
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.IR vmx (3),
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.IR cpuid (8)
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.SH BUGS
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.I Vmx
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can and will crash your kernel.
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.PP
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Currently only one core and only one VM at a time is supported.
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.SH HISTORY
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.I Vmx
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first appeared in 9front (June, 2017).
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168
sys/man/3/vmx
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168
sys/man/3/vmx
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@ -0,0 +1,168 @@
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.TH VMX 3
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.SH NAME
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vmx \- x86 virtualization interface
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.SH SYNOPSIS
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.nf
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.B #X/ctl
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.B #X/fpregs
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.B #X/map
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.B #X/regs
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.B #X/status
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.B #X/wait
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.fi
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.SH DESCRIPTION
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The
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.I vmx
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device supports "virtual CPUs" using the Intel VT-x extension (a.k.a. VMX instruction set).
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This is used by
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.IR vmx (3)
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to implement virtual machines.
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Access to the
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.I vmx
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device is restricted to the hostowner.
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.PP
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The
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.B ctl
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file provides the main control interface.
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See below for a list of commands.
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The
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.B status
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file contains the current status of the virtual CPU, which is one of
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.TF \fLinactive\fR
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.TP
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\fLinactive\fR
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No virtual CPU.
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.TP
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\fLinit\fR
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The virtual CPU is being initialized.
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.TP
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\fLready\fR
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The virtual CPU is idle and waiting for commands from user space.
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.TP
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\fLrunning\fR
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The virtual CPU is busy.
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.TP
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\fLdead\fR
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The virtual CPU suffered a fatal error.
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This state may be followed by an error message.
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.TP
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\fLending\fR
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The virtual CPU is shutting down.
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.LP
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The
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.B map
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file contains the memory map that the virtual CPU will see.
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It consists of lines of the form
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.IP
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\fIaccess\fR \fIcache\fR \fIlowaddr\fR \fIhighaddr\fR \fIsegment\fR \fIoffset\fR
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.LP
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\fILowaddr\fR specifies the lowest address in the region and \fIhighaddr\fR one past the highest address.
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The region is mapped to a region of the same size in the global segment \fIsegment\fR (see
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.IR segment (3)),
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starting at \fIoffset\fR.
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The \fIaccess\fR field specifies the permitted types of access using the characters \fLr\fR (read), \fLw\fR (write), \fLx\fR (execute) and \fL-\fR (padding character).
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The \fIcache\fR field specifies the cacheability of the region, it must be one of \fLuc\fR, \fLwc\fR, \fLwt\fR, \fLwp\fR and \fLwb\fR (as defined in the Intel SDM).
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.PP
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Writes to the
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.B map
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file append lines to the end.
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Multiple lines can be written at once but all lines written must be newline terminated.
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Regions can be overlapping, in which case later definitions always override earlier ones.
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The map can be cleared by opening the file with
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.B OTRUNC
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(see
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.IB open
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(2)).
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.PP
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The
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.B regs
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file contains the registers of the virtual CPU in the format \fIname value\fR.
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Writes to the file (in the same format) write to the referenced registers (if possible).
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Multiple lines can be written at once but all lines written must be newline terminated.
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.PP
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Reading the
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.B wait
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file will stall the reading process until the virtual CPU reaches a point where it cannot continue (a "VM exit").
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This may be due to the an access to hardware or a software exception.
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Each exit is indicated by a single line in a format compatible with
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.IR tokenize (2).
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The first column contains the cause of the exit and the second column contains the "exit qualification" field that may contain more details on the exit (see Intel SDM).
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The remaining columns come in pairs and contain further info and the values of relevant registers.
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.LP
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Some notable exit causes are (see kernel source code for a complete list)
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.TF ".\fL#\fR\fIexception\fR"
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.TP
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\fL#\fR\fIexception\fR
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Exception of the specified type (e.g. \fL#gp\fR for general protection fault).
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.TP
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\fLtriplef\fR
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Triple fault.
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.TP
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\fLeptfault\fR
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The virtual CPU attempted a memory access that does not match any entry in the \Lmap\fR file.
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.IP "\fL.\fR\fIinstr\fR"
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The virtual CPU attempted to execute the instruction \fIinstr\fR.
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.TP
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\fL*ack\fR
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Not an actual exit, but acknowledgement that an interrupt request (IRQ) was posted.
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.PP
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The
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.B fpregs
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file contains the virtual CPU's floating point registers, in the same binary format used by
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.IR proc (3).
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.SS Control messages
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.TF "\fLexc\fR \fI[excep]\fR"
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.TP
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.B init
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Create a new virtual CPU.
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.TP
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.B quit
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Destroy the current virtual CPU.
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.TP
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.BI go [regs]
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Launch the virtual CPU.
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\fIRegs\fR is an optional list of register changes in the format \fIname\fL=\fIvalue\fL;\fR that will be applied before launching.
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.TP
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\fLstep\fR [ \fL-map\fR \fIaddr segment offset\fR \fB]\fR
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Executes a single instruction with the virtual CPU.
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If the \fL-map\fR option is specified, a 4 KB page at address \fIaddr\fR will be temporarily (for the duration of the step) mapped to the spceified \fIsegment\fR and \fIoffset\fR.
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A step can fail, in which case a VM exit message is sent to
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.BR wait .
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.TP
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.BI exc excep
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The exception \fIexcep\fR is triggered in the virtual CPU.
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\fIExcep\fR can either be a named exception (such as \fL#gp\fR, in lower case) or an exception number.
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A number may be preeded by \fL#\fR to mark it as an exception, otherwise it is delivered as an interrupt (but always disregarding whether interrupts are enabled).
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.TP
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.BI irq [excep]
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An Interrupt is posted, i.e. the exception \fIexcep\fR will be triggered the next time interrupts are enabled in the virtual CPU, at which point a
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.B *ack
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message is sent to
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.BR wait.
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.IExcep\fR uses the same format as the argument of \fBexc\fR.
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.B Irq
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cancels any interrupts that have been previously posted but not yet delivered and it can be called with no argument to cancel an interrupt.
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.SH SOURCE
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.B /sys/src/9/pc/devvmx.c
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.SH "SEE ALSO"
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.IR vmx (1),
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.IR cpuid (8)
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Intel 64 and IA-32 Architectures Software Developer's Manual, Volume 3B, Chapters 23-33.
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.SH BUGS
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Currently only one virtual CPU is supported and it is tied to the bootstrap processor.
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.PP
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The interface will almost certainly change in the future.
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.PP
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.I Devvmx
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can and will crash your kernel.
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.SH HISTORY
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.I Devvmx
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first appeared in 9front (June, 2017).
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@ -1,11 +1,16 @@
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.TH CPUID 8
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.SH NAME
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cpuid \- print processor information
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cpuid, icanhasvmx \- print processor information
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.SH SYNOPSIS
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.B aux/cpuid
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[
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.B -ar
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]
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.B aux/icanhasvmx
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[
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.B -r
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]
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.SH DESCRIPTION
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Intel and compatible processors since the
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.SM Pentium™
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.TP
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.B physbits, virtbits, guestbits
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Address lines, decimal in bits
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.PP
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.I Icanhasvmx
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queries the virtual machine extension (VMX) capabilities.
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If
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.B -r
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is specified, it prints the results in raw hexadecimal; otherwise it produces a human-readable format.
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In any case it prints a summary on fd 2.
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.SH EXAMPLE
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.EX
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term% aux/cpuid
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