RTIC: Move selinux_state to a separate 4k

We need to relocate selinux_state to a separate 4k page
to enable EL2 Hypervisor to monitor changes to this
variable using ARM stage 2 MMU. We will avoid getting
page faults from un-related data as the MMU granularity
is configured to 4k.

Change-Id: I7d0e5c9eae0a2a65ca9db73e85283e164e20c11c
Signed-off-by: Preeti Nagar <pnagar@codeaurora.org>

arch/arm64/kernel/vmlinux.lds.S

@@ -5,6 +5,15 @@
  * Written by Martin Mares <mj@atrey.karlin.mff.cuni.cz>
  */
 
+#ifdef CONFIG_QCOM_RTIC
+#define BSS_FIRST_SECTIONS				\
+	. = ALIGN(PAGE_SIZE);				\
+	KEEP(*(.bss.rtic))				\
+	. = ALIGN(PAGE_SIZE);
+#else
+#define BSS_FIRST_SECTIONS
+#endif
+
 #include <asm-generic/vmlinux.lds.h>
 #include <asm/cache.h>
 #include <asm/kernel-pgtable.h>

include/linux/init.h

@@ -322,6 +322,10 @@ void __init parse_early_options(char *cmdline);
 /* Data marked not to be saved by software suspend */
 #define __nosavedata __section(.data..nosave)
 
+#ifdef CONFIG_QCOM_RTIC
+#define __rticdata  __section(.bss.rtic)
+#endif
+
 #ifdef MODULE
 #define __exit_p(x) x
 #else

security/selinux/hooks.c

@@ -103,7 +103,11 @@
 #include "audit.h"
 #include "avc_ss.h"
 
+#ifdef CONFIG_QCOM_RTIC
+struct selinux_state selinux_state __rticdata;
+#else
 struct selinux_state selinux_state;
+#endif
 
 /* SECMARK reference count */
 static atomic_t selinux_secmark_refcount = ATOMIC_INIT(0);