[PATCH v2 0/8] x86: KVM: Advertise CPUID of new Intel platform instructions to user space

Jiaxi Chen
2022-11-03T02:50:46Z

Latest Intel platform Granite Rapids/Sierra Forest has introduced below
new instructions and CPUIDs:

- CMPccXADD CPUID.(EAX=7,ECX=1):EAX[bit 7]
- AMX-FP16 CPUID.(EAX=7,ECX=1):EAX[bit 21]
- AVX-IFMA CPUID.(EAX=7,ECX=1):EAX[bit 23]
- AVX-VNNI-INT8 CPUID.(EAX=7,ECX=1):EDX[bit 4]
- AVX-NE-CONVERT CPUID.(EAX=7,ECX=1):EDX[bit 5]
- PREFETCHITI CPUID.(EAX=7,ECX=1):EDX[bit 14]

Details can be found in recent Intel ISE (Instruction Set
Extensions)[1].

This patch series advertises KVM support of these CPUIDs to host
userspace.

[1] Intel ISE: https://cdrdv2.intel.com/v1/dl/getContent/671368

v2:
- Remove vague descriptions in the changelogs, including pronouns and
"this patch" kind of things.
- Move the two CPUIDs of cpuid_leaf[12] CPUID_7_1_EAX to kvm-only
subleaves.
- Replace cpuid_leaf[12] CPUID_7_1_EAX with the last leaf
CPUID_8000_001F_EAX to shorten array length.
- Change the newly-added CPUID leaf [CPUID_7_1_EDX] in v1 into kvm-only
subleaves.

v1:
https://lore.kernel.org/all/20221019084734.3590760-1-jiaxi.chen@linux.intel.com/

Jiaxi Chen (8):
x86: KVM: Move existing x86 CPUID leaf [CPUID_7_1_EAX] to kvm-only
leaf
x86/cpufeatures: Replace [CPUID_DUMMY] in cpuid_leafs[] with the last
leaf
x86: KVM: Advertise CMPccXADD CPUID to user space
x86: KVM: Advertise AMX-FP16 CPUID to user space
x86: KVM: Advertise AVX-IFMA CPUID to user space
x86: KVM: Advertise AVX-VNNI-INT8 CPUID to user space
x86: KVM: Advertise AVX-NE-CONVERT CPUID to user space
x86: KVM: Advertise PREFETCHIT0/1 CPUID to user space

arch/x86/include/asm/cpufeature.h | 9 +++------
arch/x86/include/asm/cpufeatures.h | 20 ++++++++------------
arch/x86/include/asm/disabled-features.h | 3 +--
arch/x86/include/asm/required-features.h | 3 +--
arch/x86/kernel/cpu/common.c | 6 ------
arch/x86/kernel/cpu/cpuid-deps.c | 1 -
arch/x86/kvm/cpuid.c | 11 ++++++++---
arch/x86/kvm/reverse_cpuid.h | 15 +++++++++++++++
8 files changed, 36 insertions(+), 32 deletions(-)

base-commit: e18d6152ff0f41b7f01f9817372022df04e0d354
--
2.27.0