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
