x86/cpu, x86/mm/pkeys: Define new CR4 bit

There is a new bit in CR4 for enabling protection keys.  We
will actually enable it later in the series.

Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Thomas Gleixner <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Andy Lutomirski <[email protected]>
Cc: Borislav Petkov <[email protected]>
Cc: Brian Gerst <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Denys Vlasenko <[email protected]>
Cc: H. Peter Anvin <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

diff --git a/arch/x86/include/uapi/asm/processor-flags.h b/arch/x86/include/uapi/asm/processor-flags.h
index 79887abcb5e1fe1e45c08e94a3912fdd4ede9d4e..567de50a4c2a59c1a85ed4ee6025498352227dc1 100644 (file)
--- a/arch/x86/include/uapi/asm/processor-flags.h
+++ b/arch/x86/include/uapi/asm/processor-flags.h
@@ -118,6 +118,8 @@
 #define X86_CR4_SMEP           _BITUL(X86_CR4_SMEP_BIT)
 #define X86_CR4_SMAP_BIT       21 /* enable SMAP support */
 #define X86_CR4_SMAP           _BITUL(X86_CR4_SMAP_BIT)
+#define X86_CR4_PKE_BIT                22 /* enable Protection Keys support */
+#define X86_CR4_PKE            _BITUL(X86_CR4_PKE_BIT)
 
 /*
  * x86-64 Task Priority Register, CR8