x86/cpufeature: Add 5-level paging detection
authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>
Thu, 9 Mar 2017 14:24:02 +0000 (17:24 +0300)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 9 Mar 2017 19:48:47 +0000 (11:48 -0800)
Look for 'la57' in /proc/cpuinfo to see if your machine supports 5-level
paging.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
arch/x86/include/asm/cpufeatures.h

index 4e7772387c6e92efc365d271f08ec3fef6208c9d..b04bb6dfed7f8464c1425df50c0fa9d1481dcee2 100644 (file)
 #define X86_FEATURE_PKU                (16*32+ 3) /* Protection Keys for Userspace */
 #define X86_FEATURE_OSPKE      (16*32+ 4) /* OS Protection Keys Enable */
 #define X86_FEATURE_AVX512_VPOPCNTDQ (16*32+14) /* POPCNT for vectors of DW/QW */
-#define X86_FEATURE_RDPID      (16*32+ 22) /* RDPID instruction */
+#define X86_FEATURE_LA57       (16*32+16) /* 5-level page tables */
+#define X86_FEATURE_RDPID      (16*32+22) /* RDPID instruction */
 
 /* AMD-defined CPU features, CPUID level 0x80000007 (ebx), word 17 */
 #define X86_FEATURE_OVERFLOW_RECOV (17*32+0) /* MCA overflow recovery support */