Commit 8a9365a4 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-cpufeature-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 

Pull x86 cpufeature updates from Ingo Molnar:
 "The main changes in this cycle were related to enable ring-3
  MONITOR/MWAIT instructions support on supported CPUs, by Grzegorz
  Andrejczuk and Piotr Luc"

* 'x86-cpufeature-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/cpufeature: Move RING3MWAIT feature to avoid conflicts
  x86/cpufeature: Enable RING3MWAIT for Knights Mill
  x86/cpufeature: Enable RING3MWAIT for Knights Landing
  x86/cpufeature: Add RING3MWAIT to CPU features
  x86/elf: Add HWCAP2 to expose ring 3 MONITOR/MWAIT
  x86/msr: Add MSR_MISC_FEATURE_ENABLES and RING3MWAIT bit
  x86/cpufeature: Add AVX512_VPOPCNTDQ feature
parents 2891e8e6 3bba73b1

Documentation/admin-guide/kernel-parameters.txt

+4 −0
Original line number Diff line number Diff line
@@ -3561,6 +3561,10 @@ 
	rhash_entries=	[KNL,NET]

			Set number of hash buckets for route cache



	ring3mwait=disable

			[KNL] Disable ring 3 MONITOR/MWAIT feature on supported

			CPUs.



	ro		[KNL] Mount root device read-only on boot



	rodata=		[KNL]

arch/x86/include/asm/cpufeatures.h

+2 −2
Original line number Diff line number Diff line
@@ -186,7 +186,7 @@ 
 *

 * Reuse free bits when adding new feature flags!

 */



#define X86_FEATURE_RING3MWAIT	( 7*32+ 0) /* Ring 3 MONITOR/MWAIT */

#define X86_FEATURE_CPB		( 7*32+ 2) /* AMD Core Performance Boost */

#define X86_FEATURE_EPB		( 7*32+ 3) /* IA32_ENERGY_PERF_BIAS support */

#define X86_FEATURE_CAT_L3	( 7*32+ 4) /* Cache Allocation Technology L3 */
@@ -288,6 +288,7 @@ 
#define X86_FEATURE_AVX512VBMI  (16*32+ 1) /* AVX512 Vector Bit Manipulation instructions*/

#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 */



/* AMD-defined CPU features, CPUID level 0x80000007 (ebx), word 17 */
@@ -320,5 +321,4 @@ 
#define X86_BUG_SWAPGS_FENCE	X86_BUG(11) /* SWAPGS without input dep on GS */

#define X86_BUG_MONITOR		X86_BUG(12) /* IPI required to wake up remote CPU */

#define X86_BUG_AMD_E400	X86_BUG(13) /* CPU is among the affected by Erratum 400 */



#endif /* _ASM_X86_CPUFEATURES_H */

arch/x86/include/asm/elf.h

+9 −0
Original line number Diff line number Diff line
@@ -258,6 +258,15 @@ extern int force_personality32; 


#define ELF_HWCAP		(boot_cpu_data.x86_capability[CPUID_1_EDX])



extern u32 elf_hwcap2;



/*

 * HWCAP2 supplies mask with kernel enabled CPU features, so that

 * the application can discover that it can safely use them.

 * The bits are defined in uapi/asm/hwcap2.h.

 */

#define ELF_HWCAP2		(elf_hwcap2)



/* This yields a string that ld.so will use to load implementation

   specific libraries for optimization.  This is more specific in

   intent than poking at uname or /proc/cpuinfo.

arch/x86/include/asm/msr-index.h

+5 −0
Original line number Diff line number Diff line
@@ -543,6 +543,11 @@ 
#define MSR_IA32_MISC_ENABLE_IP_PREF_DISABLE_BIT	39

#define MSR_IA32_MISC_ENABLE_IP_PREF_DISABLE		(1ULL << MSR_IA32_MISC_ENABLE_IP_PREF_DISABLE_BIT)



/* MISC_FEATURE_ENABLES non-architectural features */

#define MSR_MISC_FEATURE_ENABLES	0x00000140



#define MSR_MISC_FEATURE_ENABLES_RING3MWAIT_BIT		1



#define MSR_IA32_TSC_DEADLINE		0x000006E0



/* P4/Xeon+ specific */

arch/x86/include/uapi/asm/hwcap2.h

0 → 100644
+7 −0
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#ifndef _ASM_X86_HWCAP2_H

#define _ASM_X86_HWCAP2_H



/* MONITOR/MWAIT enabled in Ring 3 */

#define HWCAP2_RING3MWAIT		(1 << 0)



#endif

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