xen/kbdif: Add features to disable keyboard and pointer

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-disable-keyboard to 1 if no keyboard device needs
   to be created
 - set feature-disable-pointer to 1 if no pointer device needs
   to be created

Keep old behavior by default.

Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@epam.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Release-acked-by: Juergen Gross <jgross@suse.com>

diff --git a/xen/include/public/io/kbdif.h b/xen/include/public/io/kbdif.h
index daf4bc2063c91e88aa9d0f432248f976bd75f579..23d1f70d5210bdc7e3b6849af2b3a105004e1f52 100644 (file)
--- a/xen/include/public/io/kbdif.h
+++ b/xen/include/public/io/kbdif.h
@@ -51,6 +51,18 @@
  * 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.
  *
+ * feature-disable-keyboard
+ *      Values:         <uint>
+ *
+ *      If there is no need to expose a virtual keyboard device by the
+ *      frontend then this must be set to 1.
+ *
+ * feature-disable-pointer
+ *      Values:         <uint>
+ *
+ *      If there is no need to expose a virtual pointer device by the
+ *      frontend then this must be set to 1.
+ *
  * feature-abs-pointer
  *      Values:         <uint>
  *
@@ -177,6 +189,8 @@
 
 #define XENKBD_DRIVER_NAME             "vkbd"
 
+#define XENKBD_FIELD_FEAT_DSBL_KEYBRD  "feature-disable-keyboard"
+#define XENKBD_FIELD_FEAT_DSBL_POINTER "feature-disable-pointer"
 #define XENKBD_FIELD_FEAT_ABS_POINTER  "feature-abs-pointer"
 #define XENKBD_FIELD_FEAT_RAW_POINTER  "feature-raw-pointer"
 #define XENKBD_FIELD_FEAT_MTOUCH       "feature-multi-touch"