[PATCH v4 0/6] x86: KVM: Advertise CPUID of new Intel platform instructions to user space

From: Jiaxi Chen
Date: Fri Nov 18 2022 - 09:15:13 EST


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

v4:
- Put CPUID_7_1_EAX back to cpuid_leaf[], considering more bits will be
defined in the future for this leaf.

v3:
https://lore.kernel.org/lkml/20221110015252.202566-1-jiaxi.chen@xxxxxxxxxxxxxxx/
- Remain CPUID_8000_001F_EAX in the last leaf of cpuid_leaf[]
- Replace CPUID_7_1_EAX with CPUID_LNX_5, waiting for future new CPUIDs

v2:
https://lore.kernel.org/all/20221103025030.78371-1-jiaxi.chen@xxxxxxxxxxxxxxx/
- 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@xxxxxxxxxxxxxxx/

Chang S. Bae (1):
x86: KVM: Advertise AMX-FP16 CPUID to user space

Jiaxi Chen (5):
x86: KVM: Advertise CMPccXADD 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/cpufeatures.h | 3 +++
arch/x86/kvm/cpuid.c | 8 ++++++--
arch/x86/kvm/reverse_cpuid.h | 7 +++++++
3 files changed, 16 insertions(+), 2 deletions(-)


base-commit: f0c4d9fc9cc9462659728d168387191387e903cc
--
2.27.0