[PATCH v2 07/10] xsm: drop generic event channel labeling

["Daniel P. Smith" <dpsmith@xxxxxxxxxxxxxxxxxxxx>]

The generic event channel labeling has not been used by any XSM module since
its introduction. This commit removes the capability leaving FLASK labeling
field always present. In the future if a new XSM module needs to have its own
channel label, this or a new form can be introduced.
---
 xen/common/Kconfig      | 8 --------
 xen/include/xen/sched.h | 9 ---------
 2 files changed, 17 deletions(-)

diff --git a/xen/common/Kconfig b/xen/common/Kconfig
index 3b50391392..d03a991183 100644
--- a/xen/common/Kconfig
+++ b/xen/common/Kconfig
@@ -202,17 +202,9 @@ config XENOPROF
 
 menu "Xen Security Modules"
 
-config XSM_EVTCHN_LABELING
-       bool "Enables security labeling of event channels"
-       default n
-       help
-         This enables an XSM module to label and enforce access control over
-         event channels.
-
 config XSM_FLASK
        bool "FLux Advanced Security Kernel support"
        default n
-       select XSM_EVTCHN_LABELING
        help
          Enables FLASK (FLux Advanced Security Kernel) as the access control
          mechanism used by the XSM framework.  This provides a mandatory access
diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index aecf0b8424..ef6ba6d791 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -120,15 +120,7 @@ struct evtchn
     unsigned short notify_vcpu_id; /* VCPU for local delivery notification */
     uint32_t fifo_lastq;           /* Data for identifying last queue. */
 
-#ifdef CONFIG_XSM_EVTCHN_LABELING
     union {
-#ifdef XSM_NEED_GENERIC_EVTCHN_SSID
-        /*
-         * If an XSM module needs more space for its event channel context,
-         * this pointer stores the necessary data for the security server.
-         */
-        void *generic;
-#endif
 #ifdef CONFIG_XSM_FLASK
         /*
          * Inlining the contents of the structure for FLASK avoids unneeded
@@ -138,7 +130,6 @@ struct evtchn
         uint32_t flask_sid;
 #endif
     } ssid;
-#endif
 } __attribute__((aligned(64)));
 
 int  evtchn_init(struct domain *d, unsigned int max_port);
-- 
2.20.1