Xen Document Days/TODO

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Requested Documentation

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In progress (just need to double check whether finished)

A Xen Performance Tuning Guide

Better Statements on Compatibility

There seems to be some confusion in the wider Linxu community about XL/XM compatibility. Maybe some specific questions in an FAQ/the release notes. Also migration compatibility comes up often. Any articles related to compatibility should be listed in Category:Compatibility, which I am willing to clean up.

  • Pictogram voting comment 15px.png Anthony 14:33, 26 November 2012 (UTC): I add a bunch of pages to the category, and add few link in the category to upgrade from xend to xl.
  • Pictogram voting comment 15px.png Anthony 17:19, 26 November 2012 (UTC): I also redirect XL in Xen 4.2 to XL as they had both the same content minus few things.
  • Pictogram voting comment 15px.png Lars.kurth 12:48, 22 January 2013 (UTC): Is this done?
  • Pictogram voting comment 15px.png Ijc 16:39, 25 January 2013 (UTC): I think we also need to cover compatibility confusion about 3.x vs 4.x.
  • Pictogram voting comment 15px.png Ijc 15:03, 28 January 2013 (UTC): I've added Xen Version Compatibility and a link from Xen FAW Compatibility. I think this is probably done for now?

Better XCP Overview Documentation

Easy tasks for Beginners

You may weant to read Wiki Help if you do not have an account.

Migrate useful blog posts to wiki

Sift through blog.xen.org and copy useful posts to wiki. This will mainly be a reformatting exercise. Before you copy an article, perform a search on the wiki (headline or key word) to see whether the post exists already. If in doubt, ask on the IRC channel.

Fix articles that need attention

Review Categorization

Pages With Comments or Improvement Suggestions

Missing Pages

  • Special:WantedPages - You can find missing pages by going to this link. There are several courses of actoin that can be taken:
    • The page is needed : Add {{TODO|With a comment}} to the top of the page
    • The page is not needed : Remove the reference to the page (follow the link in the bracket besides the page)
    • Note that the list of Wanted pages contains lots of needed translations and categories, which you can ignore
    • If in doubt, ask for help on the IRC channel

Open work items

Make titles of XCP and XAPI documentation consistent

Pictogram voting comment 15px.png Lars.kurth 13:09, 28 January 2013 (UTC): Often XCP related docs do not have XCP in the title, this makes it hard to find XCP related documents in titles. This is really hurting XCP users. Maybe this needs to be followed through in page categorisation also. Here is my proposal:

  • XCP related user documents should start with XCP:
  • Design documents - these are design documents should probably be labelled Component-Name:, e.g. XAPI:, etc.

Also see:

Document release signing keys and fingerprints etc

We should publish the key ids and fingerprints somewhere.

UEFI Secure Boot

Write a document on how to sign the xen binary for UEFI Secure Boot. Potential reference here: Dealing With Secure Boot

Manpages for xe command

Write manpages for xe and it's 361 subcommands.

Xen PV Architecture Documentation

Something like a SDM for Xen PV "processors".

Add pages to Category:Paravirtualised Architecture

Describe the different ways, and necessary components, to create PVs using xl

Raised by mail by Matthias Blankenhaus (who is prepared to take the lead, but needs help): This document would describe the different ways, and necessary components that each way requires, to create PVs using xl. Right now there are at least the following cases:

  • loopbacked vhds
    • single partition format
    • disk format
  • qemu backed vhds
    • qcow / qcow2
  • LVS backed image

This is not a complete list. Also the mileage of each case differs depending on the kernel features enabled in dom0/domu and also depending on the Xen version. Furthermore, certain format require additional infrastructure like the tap device.

All in all, this a complex topic that needs clarification. Doing this based on the lowest common denominator, xl, would clarify many things. In addition, baseline performance data on all of the above would help a great deal. Matthias volunteered to run the majority of needed perf tests

A Xen Security Guide

The different options in Xen for Security, trade-offs, how to set them up, how to test Xen for security and how to optimize for different scenarios

  • Pictogram voting comment 15px.png Lars.kurth 09:48, 27 March 2012 (UTC): Category:Security contains some security related docs
  • Pictogram voting comment 15px.png Lars.kurth 11:01, 4 April 2012 (UTC): It would be good if we could document a) XSM, b) Introspection API, c) Xen and SELinux in Dom0, d) Memory Access API (introduced in 4.1)
  • User Docs that where migrating content would make sense and update such as (we can attach PDF's to the wiki now for starters, or we can use a conversion tool
  • Pictogram voting comment 15px.png Lars.kurth 15:59, 19 September 2012 (UTC): Some good articles came out of XenSummit NA (these can be built upon). Got funding to document XSM; contract in place, but contractor is currently ill.

Review and Update: xenpm usage recommendations

There is Xen power management and Xenpm command which may all be outdated. These should probably be reviewed and updated.

HOWTO : using xm trigger to poweroff or firing off NMIs

Howto on using xm trigger to poweroff or firing off NMIs.

HOWTO : How to Set Up Nested Virtualization

See this thread

HOWTO: Chain pypxeboot and pygrub

How to chain pypxeboot and pygrub

  • Pictogram voting comment 15px.png Lars.kurth 10:35, 27 March 2012 (UTC): Is pypxeboot popular at all?
  • Pictogram voting comment 15px.png Fheigl: I added that. It is somewhat common, OVM 2 and OVM 3 rely on it for PXE installs. I'm not sure if xenpvnetboot is the same, or works. The use case is "you want to use the same installation server for Xen VMs and phys. servers. You want to be able to reinstall them based on PXE reply.
  • Pictogram voting comment 15px.png Fheigl: There is documentation for pypxeboot, but there is no (afaik) documentation for how pygrub is used as a fallback loader. We wasted many days just to get some hack that can't even load a newer kernel. Which sucks, in the end you spend more time/money making PV PXE boot work than you save by using virtualized servers.
  • Pictogram voting comment 15px.png Fheigl: How could it be popular given the state of documentation. <= Key issue to the left of this sentence.
  • Pictogram voting comment 15px.png Lars.kurth 16:03, 19 September 2012 (UTC): wondering whether this video contains what is needed

Updated docs for transition to git

We are planning to switch the primary Xen repositories to git at some point, a bunch of documentation will necessarily require updating.

Developer Docs

Docs that need attention or are missing

  • Make XAPI docs (built from source) available on xen.org
  • PVOPS portal on xen.org - Konrad volunteered
  • some more xenstore docs (i.e. recent python bindings that were sent to the -users list
  • Using libxenstat python bindings (imo they're broken)
  • More PV protocol docs (see recent patches to blkif.h for example)
  • Document xenstore paths used by guests and toolstack etc

Done Recently

cpupools intro / howto

George Dunlap: See Cpupools_Howto

Clear up Xen TODO List

Document Policy on Maintenance Releases

Which releases are supported, for how long. Owners. As well as a mechanism for individuals (or vendors) to take ownership of older releases (as is the case for Xen 3.4).

Document {deb,rpm,tar}-pkg targets in kernel

Mainline_Linux_Kernel_Configs talks about the obsolete and Debian specific make-kpkg tool. Should reference the kernels own foo-pkg targets instead.

  • Pictogram voting comment 15px.png Ijc 12:12, 28 January 2013 (UTC): Done. Made a bunch of other cleanups too.