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Re: [Xen-devel] [PATCH DOCDAY] introduce an xl man page in pod format

To: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [PATCH DOCDAY] introduce an xl man page in pod format
From: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
Date: Fri, 28 Oct 2011 11:43:31 +0100
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On Thu, 2011-10-27 at 17:19 +0100, Stefano Stabellini wrote:
> This is the initial version of an xl man page, based on the old xm man
> page.
> Almost every command implemented in xl should be present, a notable
> exception are the tmem commands that are currently missing.

I think it's worth enumerating all the commands, even with a TBD, since
it marks what is missing.

> Further improvements and clarifications to this man page are very welcome.
> 
> Signed-off-by: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> 
> diff -r 39aa9b2441da docs/man/xl.pod.1
> --- /dev/null   Thu Jan 01 00:00:00 1970 +0000
> +++ b/docs/man/xl.pod.1 Thu Oct 27 15:59:03 2011 +0000
> @@ -0,0 +1,805 @@
> +=head1 NAME
> +
> +XL - Xen management tool, based on LibXenlight
> +
> +=head1 SYNOPSIS
> +
> +B<xl> I<subcommand> [I<args>]

B<xl> [I<global-args>] I<subcommand> [I<args>]

The interesting global-args are -v (verbose, can be used repeatedly) and
-N (dry-run).

> +
> +=head1 DESCRIPTION
> +
> +The B<xl> program is the new tool for managing Xen guest
> +domains. The program can be used to create, pause, and shutdown
> +domains. It can also be used to list current domains, enable or pin
> +VCPUs, and attach or detach virtual block devices.
> +The old B<xm> tool is deprecated and should not be used.
> +
> +The basic structure of every B<xl> command is almost always:
> +
> +=over 2
> +
> +B<xl> I<subcommand> [I<OPTIONS>] I<domain-id>
> +
> +=back
> +
> +Where I<subcommand> is one of the subcommands listed below, I<domain-id>
> +is the numeric domain id, or the domain name (which will be internally
> +translated to domain id), and I<OPTIONS> are subcommand specific
> +options.  There are a few exceptions to this rule in the cases where
> +the subcommand in question acts on all domains, the entire machine,
> +or directly on the Xen hypervisor.  Those exceptions will be clear for
> +each of those subcommands.
> +
> +=head1 NOTES
> +
> +Most B<xl> operations rely upon B<xenstored> and B<xenconsoled>: make
> +sure you start the script B</etc/init.d/xencommons> at boot time to
> +initialize all the daemons needed by B<xl>.
> +
> +In the most common network configuration, you need to setup a bridge in dom0
> +named B<xenbr0> in order to have a working network in the guest domains.
> +Please refer to the documentation of your Linux distribution to know how to
> +setup the bridge.
> +
> +Most B<xl> commands require root privileges to run due to the
> +communications channels used to talk to the hypervisor.  Running as
> +non root will return an error.
> +
> +=head1 DOMAIN SUBCOMMANDS
> +
> +The following subcommands manipulate domains directly.  As stated
> +previously, most commands take I<domain-id> as the first parameter.
> +
> +=over 4
> +
> +=item B<create> [I<OPTIONS>] I<configfile>

The I<configfile> is optional and if it present it must come before the
options. 
In addition to the normal --option stuff you can also pass key=value to
provide options as if they were written in a configuration file, these
override whatever is in the config file.

While checking this I noticed that before processing arguments
main_create() does:

    if (argv[1] && argv[1][0] != '-' && !strchr(argv[1], '=')) {
        filename = argv[1];
        argc--; argv++;
    }

that use of argv[1] without checking argc is a little dubious (ok if
argc<1 then argc==0 and therefore argv[argc+1]==NULL, but still...).

> +
> +The create subcommand requires a config file: see L<xldomain.cfg> for
> +full details of that file format and possible options.
> +
> +I<configfile> can either be an absolute path to a file, or a relative
> +path to a file located in /etc/xen.

This isn't actually true for xl. Arguably that's a bug in xl rather than
this doc but I seem to recall that someone had a specific reason for not
doing this.

> +
> +Create will return B<as soon> as the domain is started.  This B<does
> +not> mean the guest OS in the domain has actually booted, or is
> +available for input.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-q>, B<--quiet>
> +
> +No console output.
> +
> +=item B<-f=FILE>, B<--defconfig=FILE>
> +
> +Use the given configuration file.
> +
> +=item B<-n>, B<--dryrun>
> +
> +Dry run - prints the resulting configuration in SXP but does not create
> +the domain.
> +
> +=item B<-p>
> +
> +Leave the domain paused after it is created.
> +
> +=item B<-c>
> +
> +Attach console to the domain as soon as it has started.  This is
> +useful for determining issues with crashing domains.

... and just as a general convenience since you often want to watch the
domain boot.

> +
> +=back
> +
> +B<EXAMPLES>
> +
> +=over 4
> +
> +=item I<with config file>
> +
> +  xl create DebianLenny
> +
> +This creates a domain with the file /etc/xen/DebianLenny, and returns as
> +soon as it is run.
> +
> +=back
> +
> +=item B<console> I<domain-id>
> +
> +Attach to domain I<domain-id>'s console.  If you've set up your domains to
> +have a traditional log in console this will look much like a normal
> +text log in screen.
> +
> +Use the key combination Ctrl+] to detach the domain console.

This takes -t [pv|serial] and -n (num) options.

> +
> +=item B<vncviewer> [I<OPTIONS>] I<domain-id>
> +
> +Attach to domain's VNC server, forking a vncviewer process.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item I<--autopass>
> +
> +Pass VNC password to vncviewer via stdin.

What is the behaviour if you don't do this?

Are the sub-commands intended to be in some sort of order. In general
they seem to be alphabetical but in that case vncviewer does not belong
here.

[...]
> +=item B<list> [I<OPTIONS>] [I<domain-id> ...]
> +
> +Prints information about one or more domains.  If no domains are
> +specified it prints out information about all domains.
> +
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-l>, B<--long>
> +
> +The output for B<xl list> is not the table view shown below, but
> +instead presents the data in SXP compatible format.
> +
> +=item B<-Z>, B<--context>
> +Also prints the security labels.
> +
> +=item B<-v>, B<--verbose>
> +
> +Also prints the domain UUIDs, the shutdown reason and security labels.
> +
> +=back
> +
> +B<EXAMPLE>
> +
> +An example format for the list is as follows:
> +
> +    Name                                        ID   Mem VCPUs      State   
> Time(s)
> +    Domain-0                                     0   750     4     r-----   
> 11794.3
> +    win                                          1  1019     1     r-----    
>    0.3
> +    linux                                        2  2048     2     r-----    
> 5624.2
> +
> +Name is the name of the domain.  ID the numeric domain id.  Mem is the
> +desired amount of memory to allocate to the domain (although it may
> +not be the currently allocated amount).  VCPUs is the number of
> +virtual CPUs allocated to the domain.  State is the run state (see
> +below).  Time is the total run time of the domain as accounted for by
> +Xen.
> +
> +B<STATES>
> +
> +The State field lists 6 states for a Xen domain, and which ones the
> +current domain is in.
> +
> +=over 4
> +
> +=item B<r - running>
> +
> +The domain is currently running on a CPU.
> +
> +=item B<b - blocked>
> +
> +The domain is blocked, and not running or runnable.  This can be caused
> +because the domain is waiting on IO (a traditional wait state) or has
> +gone to sleep because there was nothing else for it to do.
> +
> +=item B<p - paused>
> +
> +The domain has been paused, usually occurring through the administrator
> +running B<xl pause>.  When in a paused state the domain will still
> +consume allocated resources like memory, but will not be eligible for
> +scheduling by the Xen hypervisor.
> +
> +=item B<s - shutdown>
> +
> +FIXME: Why would you ever see this state?

This is XEN_DOMINF_shutdown which just says "/* The guest OS has shut
down. */". It is set in response to the guest calling SCHEDOP_shutdown.
I think it corresponds to the period between the guest shutting down and
the toolstack noticing and beginning to tear it down (when it moves to
dying).

> +=item B<c - crashed>
> +
> +The domain has crashed, which is always a violent ending.  Usually
> +this state can only occur if the domain has been configured not to
> +restart on crash.  See L<xldomain.cfg> for more info.
> +
> +=item B<d - dying>
> +
> +The domain is in process of dying, but hasn't completely shutdown or
> +crashed.
> +
> +FIXME: Is this right?

I think so. This is XEN_DOMINF_dying which says "/* Domain is scheduled
to die. */"

> +
> +=item B<migrate> [I<OPTIONS>] I<domain-id> I<host>
> +
> +Migrate a domain to another host machine. By default B<xl> relies on ssh as a
> +transport mechanism between the two hosts.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-s> I<sshcommand>
> +
> +Use <sshcommand> instead of ssh.  String will be passed to sh. If empty, run
> +<host> instead of ssh <host> xl migrate-receive [-d -e].
> +
> +=item B<-e>
> +
> +On the new host, do not wait in the background (on <host>) for the death of 
> the
> +domain.

Would be useful to reference the equivalent option to "xl create" here
just to clarify that they mean the same.

> +=item B<reboot> [I<OPTIONS>] I<domain-id>
> +
> +Reboot a domain.  This acts just as if the domain had the B<reboot>
> +command run from the console.

This relies on PV drivers, I think.

Not all guests have the option of typing "reboot" on the console but I
suppose it is clear enough what you mean.

>   The command returns as soon as it has
> +executed the reboot action, which may be significantly before the
> +domain actually reboots.
> +
> +The behavior of what happens to a domain when it reboots is set by the
> +B<on_reboot> parameter of the xldomain.cfg file when the domain was
> +created.
> +
> +=item B<restore> [I<OPTIONS>] [I<ConfigFile>] I<CheckpointFile>
> +
> +Build a domain from an B<xl save> state file.  See B<save> for more info.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-p>
> +
> +Do not unpause domain after restoring it.
> +
> +=item B<-e>
> +
> +Do not wait in the background for the death of the domain on the new host.

Reference xl create?

> +
> +=item B<-d>
> +
> +Enable debug messages.
> +
> +=back
> +
> +=item B<save> [I<OPTIONS>] I<domain-id> I<CheckpointFile> [I<ConfigFile>]
> +
> +Saves a running domain to a state file so that it can be restored
> +later.  Once saved, the domain will no longer be running on the
> +system, unless the -c option is used.
> +B<xl restore> restores from this checkpoint file.
> +Passing a config file argument allows the user to manually select the VM 
> config
> +file used to create the domain.
> +
> +
> +=over 4
> +
> +=item B<-c>
> +
> +Leave domain running after creating the snapshot.
> +
> +=back
> +
> +
> +=item B<shutdown> [I<OPTIONS>] I<domain-id>
> +
> +Gracefully shuts down a domain.  This coordinates with the domain OS
> +to perform graceful shutdown, so there is no guarantee that it will
> +succeed, and may take a variable length of time depending on what
> +services must be shutdown in the domain.  The command returns
> +immediately after signally the domain unless that B<-w> flag is used.

Does this rely on pv drivers or does it inject ACPI events etc on HVM?

> +
> +The behavior of what happens to a domain when it reboots is set by the
       behaviour ?

> +B<on_shutdown> parameter of the xldomain.cfg file when the domain was
> +created.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-w>
> +
> +Wait for the domain to complete shutdown before returning.
> +
> +=back
> +
> +=item B<sysrq> I<domain-id> I<letter>
> +
> +Send a I<Magic System Request> signal to the domain.  For more
> +information on available magic sys req operations, see sysrq.txt in
> +your Linux Kernel sources.

It would be nice to word this in a more generic fashion and point out
that the specific implementation on Linux behaves like sysrq. Other
guests might do other things?

Relies on PV drivers.

> [...]
> +
> +=item B<vcpu-set> I<domain-id> I<vcpu-count>
> +
> +Enables the I<vcpu-count> virtual CPUs for the domain in question.
> +Like mem-set, this command can only allocate up to the maximum virtual
> +CPU count configured at boot for the domain.
> +
> +If the I<vcpu-count> is smaller than the current number of active
> +VCPUs, the highest number VCPUs will be hotplug removed.  This may be
> +important for pinning purposes.
> +
> +Attempting to set the VCPUs to a number larger than the initially
> +configured VCPU count is an error.  Trying to set VCPUs to < 1 will be
> +quietly ignored.
> +
> +Because this operation requires cooperation from the domain operating
> +system, there is no guarantee that it will succeed.  This command will
> +not work with a full virt domain.

I thought we supported some VCPU hotplug for HVM (using ACPI and such)
these days?

[...]
> +=item B<button-press> I<domain-id> I<button>
> +
> +Indicate an ACPI button press to the domain. I<button> is may be 'power' or
> +'sleep'.

HVM only?

> +
> +=item B<trigger> I<domain-id> I<nmi|reset|init|power|sleep> [I<VCPU>]
> +
> +Send a trigger to a domain, where the trigger can be: nmi, reset, init, power
> +or sleep.  Optionally a specific vcpu number can be passed as an argument.

HVM only? nmi might work for PV, not sure about the rest.

> +=item B<getenforce>
> +
> +Returns the current enforcing mode of the Flask Xen security module.
> +
> +=item B<setenforce> I<1|0|Enforcing|Permissive>
> +
> +Sets the current enforcing mode of the Flask Xen security module
> +
> +=item B<loadpolicy> I<policyfile>
> +
> +Loads a new policy int the Flask Xen security module.

I suppose flask is something which needs to go onto the "to be
documented" list such that we can reference it from here.

> +=back
> +
> +=head1 XEN HOST SUBCOMMANDS
> +
> +=over 4
> +
> +=item B<debug-keys> I<keys>
> +
> +Send debug I<keys> to Xen.

The same as pressing the Xen "conswitch" (Ctrl-A by default) three times
and then pressing "keys".

> +
> +=item B<dmesg> [B<-c>]
> +
> +Reads the Xen message buffer, similar to dmesg on a Linux system.  The
                                            dmesg(1)   ^Unix or ;-)

> +buffer contains informational, warning, and error messages created
> +during Xen's boot process.  If you are having problems with Xen, this
> +is one of the first places to look as part of problem determination.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-c>, B<--clear>
> +
> +Clears Xen's message buffer.
> +
> +=back
> +
> +=item B<info> [B<-n>, B<--numa>]
> +
> +Print information about the Xen host in I<name : value> format.  When
> +reporting a Xen bug, please provide this information as part of the
> +bug report.

I'm not sure this is useful people reporting bugs will look for
information on reporting bugs (which should include this info) rather
than scanning the xl man page for options which say "please include.."

I have added the need for this to
http://wiki.xen.org/xenwiki/ReportingBugs

> +
> +Sample output looks as follows (lines wrapped manually to make the man
> +page more readable):

> +
> + host                   : talon
> + release                : 2.6.12.6-xen0

Heh. Perhaps a more up to date example if one is needed at all?

> + version                : #1 Mon Nov 14 14:26:26 EST 2005
> + machine                : i686
> + nr_cpus                : 2
> + nr_nodes               : 1
> + cores_per_socket       : 1
> + threads_per_core       : 1
> + cpu_mhz                : 696
> + hw_caps                : 0383fbff:00000000:00000000:00000040
> + total_memory           : 767
> + free_memory            : 37
> + xen_major              : 3
> + xen_minor              : 0
> + xen_extra              : -devel
> + xen_caps               : xen-3.0-x86_32
> + xen_scheduler          : credit
> + xen_pagesize           : 4096
> + platform_params        : virt_start=0xfc000000
> + xen_changeset          : Mon Nov 14 18:13:38 2005 +0100
> +                          7793:090e44133d40
> + cc_compiler            : gcc version 3.4.3 (Mandrakelinux
> +                          10.2 3.4.3-7mdk)
> + cc_compile_by          : sdague
> + cc_compile_domain      : (none)
> + cc_compile_date        : Mon Nov 14 14:16:48 EST 2005
> + xend_config_format     : 4
> +
> +B<FIELDS>
> +
> +Not all fields will be explained here, but some of the less obvious
> +ones deserve explanation:
> +
> +=over 4
> +
> +=item B<hw_caps>
> +
> +A vector showing what hardware capabilities are supported by your
> +processor.  This is equivalent to, though more cryptic, the flags
> +field in /proc/cpuinfo on a normal Linux machine.

Does this correspond to some cpuid output somewhere? That might be a
good thing to reference.

(checks, hmm, it all very processor specific)

> +=back
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-n>, B<--numa>
> +
> +List host NUMA topology information
> +
> +=back
[...]

> +=item B<pci-list-assignable-devices>
> +
> +List all the assignable PCI devices.

Perhaps add:
        That is, though devices in the system which are configured to be
        available for passthrough and are bound to a suitable PCI
        backend driver in domain 0 rather than a real driver.

> +=head1 CPUPOOLS COMMANDS
> +
> +Xen can group the physical cpus of a server in cpu-pools. Each physical CPU 
> is
> +assigned at most to one cpu-pool. Domains are each restricted to a single
> +cpu-pool. Scheduling does not cross cpu-pool boundaries, so each cpu-pool has
> +an own scheduler.
> +Physical cpus and domains can be moved from one pool to another only by an
> +explicit command.
> +
> +=over 4
> +
> +=item B<cpupool-create> [I<OPTIONS>] I<ConfigFile>
> +
> +Create a cpu pool based an I<ConfigFile>.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item B<-f=FILE>, B<--defconfig=FILE>
> +
> +Use the given configuration file.
> +
> +=item B<-n>, B<--dryrun>
> +
> +Dry run - prints the resulting configuration.

Is this deprecated in favour of global -N option? I think it should be.

> +
> +=back
> +
> +=item B<cpupool-list> [I<-c|--cpus> I<cpu-pool>]
> +
> +List CPU pools on the host.
> +If I<-c> is specified, B<xl> prints a list of CPUs used by I<cpu-pool>.

Is cpu-pool a name or a number, or both? (this info would be useful in
the intro to the section I suppose).

> +
> +=item B<cpupool-destroy> I<cpu-pool>
> +
> +Deactivates a cpu pool.
> +
> +=item B<cpupool-rename> I<cpu-pool> <newname>
> +
> +Renames a cpu pool to I<newname>.
> +
> +=item B<cpupool-cpu-add> I<cpu-pool> I<cpu-nr|node-nr>
> +
> +Adds a cpu or a numa node to a cpu pool.
> +
> +=item B<cpupool-cpu-remove> I<cpu-nr|node-nr>
> +
> +Removes a cpu or a numa node from a cpu pool.
> +
> +=item B<cpupool-migrate> I<domain-id> I<cpu-pool>
> +
> +Moves a domain into a cpu pool.
> +
> +=item B<cpupool-numa-split>
> +
> +Splits up the machine into one cpu pool per numa node.
> +
> +=back
> +
> +=head1 VIRTUAL DEVICE COMMANDS
> +
> +Most virtual devices can be added and removed while guests are
> +running.

... assuming the necessary support exists in the guest.

>   The effect to the guest OS is much the same as any hotplug
> +event.
> +
> +=head2 BLOCK DEVICES
> +
> +=over 4
> +
> +=item B<block-attach> I<domain-id> I<disc-spec-component(s)> ...
> +
> +Create a new virtual block device.  This will trigger a hotplug event
> +for the guest.

Should add a reference to the docs/misc/xl-disk-configuration.txt doc to
your SEE ALSO section.

> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item I<domain-id>
> +
> +The domain id of the guest domain that the device will be attached to.
> +
> +=item I<disc-spec-component>
> +
> +A disc specification in the same format used for the B<disk> variable in
> +the domain config file. See L<xldomain.cfg>.
> +
> +=back
> +
> +=item B<block-detach> I<domain-id> I<devid> [B<--force>]
> +
> +Detach a domain's virtual block device. I<devid> may be the symbolic
> +name or the numeric device id given to the device by domain 0.  You
> +will need to run B<xl block-list> to determine that number.
> +
> +Detaching the device requires the cooperation of the domain.  If the
> +domain fails to release the device (perhaps because the domain is hung
> +or is still using the device), the detach will fail.  The B<--force>
> +parameter will forcefully detach the device, but may cause IO errors
> +in the domain.
> +
> +=item B<block-list> I<domain-id>
> +
> +List virtual block devices for a domain.
> +
> +=item B<cd-insert> I<domain-id> I<VirtualDevice> I<be-dev>
> +
> +Insert a cdrom into a guest domain's cd drive. Only works with HVM domains.
> +
> +B<OPTIONS>
> +
> +=over 4
> +
> +=item I<VirtualDevice>
> +
> +How the device should be presented to the guest domain; for example /dev/hdc.
> +
> +=item I<be-dev>
> +
> +the device in the backend domain (usually domain 0) to be exported; it can 
> be a
> +path to a file (file://path/to/file.iso). See B<disk> in L<xldomain.cfg> for 
> the
> +details.
> +
> +=back
> +
> +=item B<cd-eject> I<domain-id> I<VirtualDevice>
> +
> +Eject a cdrom from a guest's cd drive. Only works with HVM domains.
> +I<VirtualDevice> is the cdrom device in the guest to eject.
> +
> +=back
> +
> +=head2 NETWORK DEVICES
> +
> +=over 4
> +
> +=item B<network-attach> I<domain-id> I<network-device>
> +
> +Creates a new network device in the domain specified by I<domain-id>.
> +I<network-device> describes the device to attach, using the same format as 
> the
> +B<vif> string in the domain config file. See L<xldomain.cfg> for the
> +description.

I sent out a patch to add docs/misc/xl-network-configuration.markdown as
well.

> +
> +=item B<network-detach> I<domain-id> I<devid|mac>
> +
> +Removes the network device from the domain specified by I<domain-id>.
> +I<devid> is the virtual interface device number within the domain
> +(i.e. the 3 in vif22.3). Alternatively the I<mac> address can be used to
> +select the virtual interface to detach.
> +
> +=item B<network-list> I<domain-id>
> +
> +List virtual network interfaces for a domain.
> +
> +=back
> +
> +=head2 PCI PASS-THROUGH
> +
> +=over 4
> +
> +=item B<pci-attach> I<domain-id> I<BDF>
> +
> +Hot-plug a new pass-through pci device to the specified domain.
> +B<BDF> is the PCI Bus/Device/Function of the physical device to pass-through.
> +
> +=item B<pci-detach> [I<-f>] I<domain-id> I<BDF>
> +
> +Hot-unplug a previously assigned pci device from a domain. B<BDF> is the PCI
> +Bus/Device/Function of the physical device to be removed from the guest 
> domain.
> +
> +If B<-f> is specified, B<xl> is going to forcefully remove the device even
> +without guest's collaboration.
> +
> +=item B<pci-list> I<domain-id>
> +
> +List pass-through pci devices for a domain.
> +
> +=back
> +
> +=head1 SEE ALSO
> +
> +B<xldomain.cfg>(5), B<xentop>(1)
> +
> +=head1 AUTHOR
> +
> +  Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>
> +  Vincent Hanquez <vincent.hanquez@xxxxxxxxxxxxx>
> +  Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
> +  Ian Campbell <Ian.Campbell@xxxxxxxxxx>

This list seems so incomplete/unlikely to be updated that it may as well
not be included. (also I think AUTHOR in a man page refers to the author
of the page, not the authors of the software)

> +=head1 BUGS
> +
> +Send bugs to xen-devel@xxxxxxxxxxxxxxxxxxxx

Reference http://wiki.xen.org/xenwiki/ReportingBugs

Ian.



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