Messages in this thread | | | From | Fenghua Yu <> | Subject | [PATCH v2 0/2] x86/cpufeatures: Re-arrange a few features and enumerate AVX512 BFLOAT16 intructions | Date | Mon, 17 Jun 2019 11:00:14 -0700 |
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To enumerate AVX512 BFLOAT16 feature CPUID.7.1:EAX[5] and other future features in CPUID.7.1:EAX, Boris suggests to create a new pure feature bits word.
Boris further suggests to re-define word 11 as a scattered features word and move the four X86_FEATURE_CQM_* features in existing word 11 and word 12 into the new word 11. Then use word 12 to hold features in CPUID.7.1:EAX including AVX512 BFLOAT16 instructions.
Change Log: v2: - Remove patch 0001 and keep x86_cache_max_rmid and x86_cache_occ_scale in cpuinfo_x86 per Thomas Gleixner's comment.
v1: Address all comments from Borislav Petkov: - Re-define feature word 11 as a scattered features word and move the four X86_FEATURE_CQM_* features into the word - Re-define feature word 12 to hold CPUID.7.1:EAX including BFLOAT16 - Name a dummy leaf 12 in cpuid_leafs in patch 0002 to avoid bisect error - Simplify code to get number of rmid and monitoring scale in rdt_get_mon_l3_config()
Fenghua Yu (2): x86/cpufeatures: Combine word 11 and 12 into new scattered features word 11 x86/cpufeatures: Enumerate new AVX512 BFLOAT16 instructions
arch/x86/include/asm/cpufeature.h | 4 +-- arch/x86/include/asm/cpufeatures.h | 18 ++++++---- arch/x86/kernel/cpu/common.c | 56 ++++++++++++++++-------------- arch/x86/kernel/cpu/cpuid-deps.c | 4 +++ arch/x86/kernel/cpu/scattered.c | 4 +++ arch/x86/kvm/cpuid.h | 2 -- 6 files changed, 51 insertions(+), 37 deletions(-)
-- 2.19.1
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