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

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Date:   Fri, 18 Nov 2022 22:15:03 +0800
From:   Jiaxi Chen <jiaxi.chen@...ux.intel.com>
To:     kvm@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
        seanjc@...gle.com, pbonzini@...hat.com, ndesaulniers@...gle.com,
        alexandre.belloni@...tlin.com, peterz@...radead.org,
        jpoimboe@...nel.org, chang.seok.bae@...el.com,
        pawan.kumar.gupta@...ux.intel.com, babu.moger@....com,
        jmattson@...gle.com, sandipan.das@....com, tony.luck@...el.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com, fenghua.yu@...el.com,
        keescook@...omium.org, nathan@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/6] x86: KVM: Advertise CPUID of new Intel platform instructions to user space

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@linux.intel.com/
 - 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@linux.intel.com/
 - 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/

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