[Xen-devel] [PATCH v2 2/4] docs: Document a xenstore path for PV driver version information...

[Paul Durrant <paul.durrant@xxxxxxxxxx>]

...to be advertised by a guest.

For domain management purposes it is convenient to be able to see
PV driver version information in xenstore. The XAPI toolstack in
XenServer has always created a ~/drivers path for this purpose.

This patch documents that path and also adds a specification of how
it should be used.

Signed-off-by: Paul Durrant <paul.durrant@xxxxxxxxxx>
Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
---

v2:
 - Modify version specifier to allow for single-part version numbers
   and also arbitrary string suffix (e.g. '-debug')
---
 docs/misc/xenstore-paths.markdown | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/docs/misc/xenstore-paths.markdown 
b/docs/misc/xenstore-paths.markdown
index ec3cc5f..5c0a519 100644
--- a/docs/misc/xenstore-paths.markdown
+++ b/docs/misc/xenstore-paths.markdown
@@ -37,6 +37,8 @@ before regexp expansion:
   the "other" domain. i.e. ~ refers to the domain providing a service
   while $DOMID is the consumer of that service.
 * $UUID -- a UUID in the form xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
+* $NAME -- a string identifying an object within a domain. Typically
+  comprising only alphanumeric characters.
 
 VALUES are strings and can take the following forms:
 
@@ -51,6 +53,11 @@ VALUES are strings and can take the following forms:
 * (VALUE | VALUE | ... ) -- a set of alternatives. Alternatives are
   separated by a "|" and all the alternatives are enclosed in "(" and
   ")".
+* VERSION -- 1, 2 or 3 integers, in decimal form separated by "."
+             followed by a STRING suffix (starting with the first
+             non-numeric character).
+             The integers are a version number of the form MAJOR,
+             MAJOR.MINOR or MAJOR.MINOR.MICRO respectively.
 
 Additional TAGS may follow as a comma separated set of the following
 tags enclosed in square brackets.
@@ -377,6 +384,11 @@ protocol definition.
 
 A domain writable path. Available for arbitrary domain use.
 
+#### ~/drivers/$NAME/version = VERSION [w]
+
+A domain may write version information for PV driver $NAME using
+this path.
+
 ### Paths private to the toolstack
 
 #### ~/device-model/$DOMID/state [w]
-- 
2.1.4


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