x86, AVX-512: Enable AVX-512 States Context Switch

commit c2bc11f1 upstream.

This patch enables Opmask, ZMM_Hi256, and Hi16_ZMM AVX-512 states for
xstate context switch.
Signed-off-by: Fenghua Yu <fenghua.yu@intel.com>
Link: http://lkml.kernel.org/r/1392931491-33237-2-git-send-email-fenghua.yu@intel.comSigned-off-by: H. Peter Anvin <hpa@linux.intel.com>
[ Fenghua Yu: backport to 3.13-stable (apply new bits directly to XCNTXT_MASK) ]
Signed-off-by: Kamal Mostafa <kamal@canonical.com>

arch/x86/include/asm/xsave.h

@@ -9,6 +9,11 @@
 #define XSTATE_FP		0x1
 #define XSTATE_SSE		0x2
 #define XSTATE_YMM		0x4
+#define XSTATE_BNDREGS		0x8
+#define XSTATE_BNDCSR		0x10
+#define XSTATE_OPMASK		0x20
+#define XSTATE_ZMM_Hi256	0x40
+#define XSTATE_Hi16_ZMM		0x80
 
 #define XSTATE_FPSSE	(XSTATE_FP | XSTATE_SSE)
 
@@ -23,7 +28,7 @@
 /*
  * These are the features that the OS can handle currently.
  */
-#define XCNTXT_MASK	(XSTATE_FP | XSTATE_SSE | XSTATE_YMM)
+#define XCNTXT_MASK	(XSTATE_FP | XSTATE_SSE | XSTATE_YMM | XSTATE_OPMASK | XSTATE_ZMM_Hi256 | XSTATE_Hi16_ZMM)
 
 #ifdef CONFIG_X86_64
 #define REX_PREFIX	"0x48, "