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Bae" To: pbonzini@redhat.com, seanjc@google.com Cc: kvm@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org, zhao1.liu@intel.com, chang.seok.bae@intel.com Subject: [PATCH v8 18/20] KVM: x86: Expose APX sub-features to userspace Date: Wed, 30 Sep 2026 21:07:48 +0000 Message-ID: <20260930210750.1487547-19-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260930210750.1487547-1-chang.seok.bae@intel.com> References: <20260930210750.1487547-1-chang.seok.bae@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add CPUID leaf 0x29 sub-leaf 0 to expose these APX sub-features, if the APX foundation is available: * New Conditional Instructions (NCI) * New Data Destination (NDD) * Flags Suppression (NF) Tested-by: Zhao Liu Signed-off-by: Chang S. Bae --- arch/x86/include/asm/kvm_host.h | 1 + arch/x86/kvm/cpuid.c | 7 ++++++- arch/x86/kvm/reverse_cpuid.h | 4 ++++ 3 files changed, 11 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h index 690de9606d6d..f1e51c055c0f 100644 --- a/arch/x86/include/asm/kvm_host.h +++ b/arch/x86/include/asm/kvm_host.h @@ -729,6 +729,7 @@ enum kvm_only_cpuid_leafs { CPUID_7_1_ECX, CPUID_1E_1_EAX, CPUID_24_1_ECX, + CPUID_29_0_EBX, NR_KVM_CPU_CAPS, NKVMCAPINTS = NR_KVM_CPU_CAPS - NCAPINTS, diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 990ad7ea4818..6c47e0ffedd8 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -1112,6 +1112,10 @@ void kvm_initialize_cpu_caps(void) F(AVX10_VNNI_INT), ); + kvm_cpu_cap_init(CPUID_29_0_EBX, + F(APX_NCI_NDD_NF), + ); + kvm_cpu_cap_init(CPUID_8000_0001_ECX, F(LAHF_LM), F(CMP_LEGACY), @@ -1733,7 +1737,8 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function) } /* APX sub-features */ case 0x29: - entry->eax = entry->ebx = entry->ecx = entry->edx = 0; + if (!kvm_cpu_cap_has(X86_FEATURE_APX)) + entry->eax = entry->ebx = entry->ecx = entry->edx = 0; break; case KVM_CPUID_SIGNATURE: { const u32 *sigptr = (const u32 *)KVM_SIGNATURE; diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h index 80b41d5559da..b20c8be4fea6 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -69,6 +69,9 @@ /* Intel-defined sub-features, CPUID level 0x00000024:1 (ECX) */ #define X86_FEATURE_AVX10_VNNI_INT KVM_X86_FEATURE(CPUID_24_1_ECX, 2) +/* Intel-defined sub-features, CPUID level 0x00000029:0 (EBX) */ +#define X86_FEATURE_APX_NCI_NDD_NF KVM_X86_FEATURE(CPUID_29_0_EBX, 0) + /* CPUID level 0x80000007 (EDX). */ #define KVM_X86_FEATURE_CONSTANT_TSC KVM_X86_FEATURE(CPUID_8000_0007_EDX, 8) @@ -112,6 +115,7 @@ static const struct cpuid_reg reverse_cpuid[] = { [CPUID_7_1_ECX] = { 7, 1, CPUID_ECX}, [CPUID_1E_1_EAX] = { 0x1e, 1, CPUID_EAX}, [CPUID_24_1_ECX] = { 0x24, 1, CPUID_ECX}, + [CPUID_29_0_EBX] = { 0x29, 0, CPUID_EBX}, }; /* -- 2.53.0