[PATCH v2] xen/kbdif: Add features to control keyboard and pointer

[Oleksandr Andrushchenko <andr2000@gmail.com>]

From: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>

It is now not fully possible to control if and which virtual devices
are created by the frontend, e.g. keyboard and pointer devices
are always created and multi-touch device is created if the
backend advertises multi-touch support. In some cases this
behavior is not desirable and better control over the frontend's
configuration is required.

Add new XenStore feature fields, so it is possible to individually
control set of exposed virtual devices for each guest OS:
 - set feature-keyboard to 0 if no keyboard device needs to be created
 - set feature-pointer to 0 if no pointer device needs to be created

Keep old behavior by default.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
---
 xen/include/public/io/kbdif.h | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/xen/include/public/io/kbdif.h b/xen/include/public/io/kbdif.h
index 3ce54e9a44c1..ac92e466fd9c 100644
--- a/xen/include/public/io/kbdif.h
+++ b/xen/include/public/io/kbdif.h
@@ -49,7 +49,22 @@
  *
  * Capable backend advertises supported features by publishing
  * corresponding entries in XenStore and puts 1 as the value of the entry.
- * If a feature is not supported then 0 must be set or feature entry omitted.
+ * If not otherwise noted if a feature is not supported then 0 must be set
+ * or feature entry omitted.
+ *
+ * feature-keyboard
+ *      Values:         <uint>
+ *
+ *      If no virtual keyboard device to be exposed by the frontend then
+ *      this must be set to 0. If feature entry omitted or not set its
+ *      value defaults to 1.
+ *
+ * feature-pointer
+ *      Values:         <uint>
+ *
+ *      If no virtual pointer device to be exposed by the frontend then
+ *      this must be set to 0. If feature entry omitted or not set its
+ *      value defaults to 1.
  *
  * feature-abs-pointer
  *      Values:         <uint>
@@ -177,6 +192,8 @@
 
 #define XENKBD_DRIVER_NAME             "vkbd"
 
+#define XENKBD_FIELD_FEAT_KEYBOARD     "feature-keyboard"
+#define XENKBD_FIELD_FEAT_POINTER      "feature-pointer"
 #define XENKBD_FIELD_FEAT_ABS_POINTER  "feature-abs-pointer"
 #define XENKBD_FIELD_FEAT_MTOUCH       "feature-multi-touch"
 #define XENKBD_FIELD_REQ_ABS_POINTER   "request-abs-pointer"
-- 
2.17.0


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