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Commit a8d9df5a authored by Gayatri Kammela's avatar Gayatri Kammela Committed by Thomas Gleixner
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x86/cpufeatures: Enable new AVX512 cpu features 

Add a few new AVX512 instruction groups/features for enumeration in
/proc/cpuinfo: AVX512IFMA and AVX512VBMI.

Clear the flags in fpu_xstate_clear_all_cpu_caps().

CPUID.(EAX=7,ECX=0):EBX[bit 21] AVX512IFMA
CPUID.(EAX=7,ECX=0):ECX[bit 1]  AVX512VBMI

Detailed information of cpuid bits for the features can be found at
https://bugzilla.kernel.org/show_bug.cgi?id=187891



Signed-off-by: default avatarGayatri Kammela <gayatri.kammela@intel.com>
Reviewed-by: default avatarBorislav Petkov <bp@alien8.de>
Cc: Ravi Shankar <ravi.v.shankar@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: mingo@elte.hu
Link: http://lkml.kernel.org/r/1479327060-18668-1-git-send-email-gayatri.kammela@intel.com


Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent 47bdf337

arch/x86/include/asm/cpufeatures.h

+2 −0
Original line number Diff line number Diff line
@@ -226,6 +226,7 @@ 
#define X86_FEATURE_RDSEED	( 9*32+18) /* The RDSEED instruction */

#define X86_FEATURE_ADX		( 9*32+19) /* The ADCX and ADOX instructions */

#define X86_FEATURE_SMAP	( 9*32+20) /* Supervisor Mode Access Prevention */

#define X86_FEATURE_AVX512IFMA  ( 9*32+21) /* AVX-512 Integer Fused Multiply-Add instructions */

#define X86_FEATURE_CLFLUSHOPT	( 9*32+23) /* CLFLUSHOPT instruction */

#define X86_FEATURE_CLWB	( 9*32+24) /* CLWB instruction */

#define X86_FEATURE_AVX512PF	( 9*32+26) /* AVX-512 Prefetch */
@@ -279,6 +280,7 @@ 
#define X86_FEATURE_AVIC	(15*32+13) /* Virtual Interrupt Controller */



/* Intel-defined CPU features, CPUID level 0x00000007:0 (ecx), word 16 */

#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 */

arch/x86/kernel/fpu/xstate.c

+2 −0
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ void fpu__xstate_clear_all_cpu_caps(void) 
	setup_clear_cpu_cap(X86_FEATURE_AVX);

	setup_clear_cpu_cap(X86_FEATURE_AVX2);

	setup_clear_cpu_cap(X86_FEATURE_AVX512F);

	setup_clear_cpu_cap(X86_FEATURE_AVX512IFMA);

	setup_clear_cpu_cap(X86_FEATURE_AVX512PF);

	setup_clear_cpu_cap(X86_FEATURE_AVX512ER);

	setup_clear_cpu_cap(X86_FEATURE_AVX512CD);
@@ -73,6 +74,7 @@ void fpu__xstate_clear_all_cpu_caps(void) 
	setup_clear_cpu_cap(X86_FEATURE_AVX512VL);

	setup_clear_cpu_cap(X86_FEATURE_MPX);

	setup_clear_cpu_cap(X86_FEATURE_XGETBV1);

	setup_clear_cpu_cap(X86_FEATURE_AVX512VBMI);

	setup_clear_cpu_cap(X86_FEATURE_PKU);

	setup_clear_cpu_cap(X86_FEATURE_AVX512_4VNNIW);

	setup_clear_cpu_cap(X86_FEATURE_AVX512_4FMAPS);