[PATCH 1/3] tools/xenstore: add documentation for new set/get-feature commands

[Juergen Gross <jgross@xxxxxxxx>]

Add documentation for two new Xenstore wire commands SET_FEATURE and
GET_FEATURE used to set or query the Xenstore features visible in the
ring page of a given domain.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 docs/misc/xenstore-ring.txt |  1 +
 docs/misc/xenstore.txt      | 12 ++++++++++++
 2 files changed, 13 insertions(+)

diff --git a/docs/misc/xenstore-ring.txt b/docs/misc/xenstore-ring.txt
index f91accb5b0..bd000f694e 100644
--- a/docs/misc/xenstore-ring.txt
+++ b/docs/misc/xenstore-ring.txt
@@ -68,6 +68,7 @@ Mask    Description
 -----------------------------------------------------------------
 1       Ring reconnection (see the ring reconnection feature below)
 2       Connection error indicator (see connection error feature below)
+4       GET_FEATURE and SET_FEATURE Xenstore wire commands are available
 
 The "Connection state" field is used to request a ring close and reconnect.
 The "Connection state" field only contains valid data if the server has
diff --git a/docs/misc/xenstore.txt b/docs/misc/xenstore.txt
index ea3d8be177..31e3d53c52 100644
--- a/docs/misc/xenstore.txt
+++ b/docs/misc/xenstore.txt
@@ -332,6 +332,18 @@ SET_TARGET         <domid>|<tdomid>|
 
        xenstored prevents the use of SET_TARGET other than by dom0.
 
+GET_FEATURE            <domid>|                <value>|
+SET_FEATURE            <domid>|<value>|
+       Returns or sets the contents of the "feature" field located at
+       offset 2064 of the Xenstore ring page of the domain specified by
+       <domid>. <value> is a decimal number being a logical or of the
+       feature bits as defined in docs/misc/xenstore-ring.txt. Trying
+       to set a bit for a feature not being supported by the running
+       Xenstore will be denied.
+
+       xenstored prevents the use of GET_FEATURE and SET_FEATURE other
+       than by dom0.
+
 ---------- Miscellaneous ----------
 
 CONTROL                        <command>|[<parameters>|]
-- 
2.34.1