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xen, xen-tools: Document the version update process in README

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Describes the versions of Xen to be included in meta-virtualization
and recipe maintenance in release branches.

Signed-off-by: Christopher Clark <christopher.w.clark@gmail.com>
Reviewed-by: Bertrand Marquis <bertrand.marquis@arm.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
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Christopher Clark 2021-04-16 11:41:34 -07:00 committed by Bruce Ashfield
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@ -36,3 +36,53 @@ as XSAs (http://xenbits.xen.org/xsa/). The easiest way to include those is to
drop patches in 'recipes-extened/xen/files' and create a bbappend adding those
patches to SRC_URI and they will be applied. Alternatively, you can override
the SRC_URI to a git repo you provide that contains the patches.
recipe maintenance
------------------
# Xen version update
The following rules shall be followed to define which versions of Xen have
recipes in meta-virtualization:
- Before a Yocto release meta-virtualization shall have recipes for:
- the latest stable major version of Xen, and
- the current version of the Xen master branch (known as the git recipes)
- In addition, there may also be recipes included for the previous stable
major version of Xen, in the case where the latest stable major version
is new and the prior stable major version of Xen is to be the preferred
version for the Yocto release
- On Yocto LTS and the latest stable Yocto release branch, the preferred Xen
major version that is present when the Yocto release is issued must stay
supported and the recipes shall be regularly updated to follow updates
available in the Xen stable branch for that Xen major release.
- On Yocto LTS and the latest stable Yocto release branch, the recipes for the
latest Xen major version shall also be regularly updated to follow updates
available in the Xen stable branch for that Xen major release.
- On the master / in-development Yocto branch, new Xen recipes shall be added
when there is a new Xen major release.
- depending on the timing of the next Yocto release, the new recipes may
be preferred, or the prior major version recipes may remain preferred
until after the Yocto release
- the recipes for the previous Xen stable major version shall be removed
from the branch when it is no longer the preferred Xen version
- On Yocto LTS and the latest stable Yocto release branch, new Xen recipes
shall be added when there is a new Xen major release.
- The preferred version of the Xen recipes shall always stay at the same
Xen major version once a Yocto release has been issued, and shall receive
regular updates to track the stable Xen branch of that Xen release.
- When new Xen recipes are added to a Yocto branch for a new Xen major
version, then any older Xen recipes present, except for the original
preferred version recipes, shall be marked as not updated anymore by
adding a comment inside the recipes. The older recipes will not receive
any build tests or be updated to follow the Xen branch.