x86/cpufeatures: Add FDP_EXCPTN_ONLY and ZERO_FCS_FDS

Add the CPUID enumeration for Intel's de-feature bits to accommodate
passing these de-features through to kvm guests.

These de-features are (from SDM vol 1, section 8.1.8):
 - X86_FEATURE_FDP_EXCPTN_ONLY: If CPUID.(EAX=07H,ECX=0H):EBX[bit 6] = 1, the
   data pointer (FDP) is updated only for the x87 non-control instructions that
   incur unmasked x87 exceptions.
 - X86_FEATURE_ZERO_FCS_FDS: If CPUID.(EAX=07H,ECX=0H):EBX[bit 13] = 1, the
   processor deprecates FCS and FDS; it saves each as 0000H.

Signed-off-by: Aaron Lewis <[email protected]>
Signed-off-by: Borislav Petkov <[email protected]>
Reviewed-by: Jim Mattson <[email protected]>
Cc: Fenghua Yu <[email protected]>
Cc: Frederic Weisbecker <[email protected]>
Cc: "H. Peter Anvin" <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Konrad Rzeszutek Wilk <[email protected]>
Cc: [email protected]
Cc: Peter Feiner <[email protected]>
Cc: [email protected]
Cc: Robert Hoo <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Thomas Lendacky <[email protected]>
Cc: x86-ml <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 75f27ee2c263f4233f7818c52c1afa4a3fca768b..1017b9c7dfe0336afc896f9f6801a5cbfe2e96d8 100644 (file)
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -239,12 +239,14 @@
 #define X86_FEATURE_BMI1               ( 9*32+ 3) /* 1st group bit manipulation extensions */
 #define X86_FEATURE_HLE                        ( 9*32+ 4) /* Hardware Lock Elision */
 #define X86_FEATURE_AVX2               ( 9*32+ 5) /* AVX2 instructions */
+#define X86_FEATURE_FDP_EXCPTN_ONLY    ( 9*32+ 6) /* "" FPU data pointer updated only on x87 exceptions */
 #define X86_FEATURE_SMEP               ( 9*32+ 7) /* Supervisor Mode Execution Protection */
 #define X86_FEATURE_BMI2               ( 9*32+ 8) /* 2nd group bit manipulation extensions */
 #define X86_FEATURE_ERMS               ( 9*32+ 9) /* Enhanced REP MOVSB/STOSB instructions */
 #define X86_FEATURE_INVPCID            ( 9*32+10) /* Invalidate Processor Context ID */
 #define X86_FEATURE_RTM                        ( 9*32+11) /* Restricted Transactional Memory */
 #define X86_FEATURE_CQM                        ( 9*32+12) /* Cache QoS Monitoring */
+#define X86_FEATURE_ZERO_FCS_FDS       ( 9*32+13) /* "" Zero out FPU CS and FPU DS */
 #define X86_FEATURE_MPX                        ( 9*32+14) /* Memory Protection Extension */
 #define X86_FEATURE_RDT_A              ( 9*32+15) /* Resource Director Technology Allocation */
 #define X86_FEATURE_AVX512F            ( 9*32+16) /* AVX-512 Foundation */