Re: [PATCH v2] KVM: x86: Remove AMX-TF32 enumeration
From: Xiaoyao Li
Date: Mon Jul 20 2026 - 20:37:40 EST
On 7/21/2026 4:52 AM, Chang S. Bae wrote:
AMX-TF32 enumeration was added based on the Intel documentation [1]. The
recent update removed the feature, indicating that the feature is no
longer planned for hardware implementation.
[1] Intel Architecture Instruction Set Extensions and Future Features
Note: The feature first appeared in the September 2025 revision of the
document and was removed in the June 2026 revision.
The feature was first introduced in revision 054, October 2024.
It's recorded in the revision history.
Cc: stable@xxxxxxxxxxxxxxx # v6.20+
Reviewed-by: Zhao Liu <zhao1.liu@xxxxxxxxx>
Reviewed-by: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>
Signed-off-by: Chang S. Bae <chang.seok.bae@xxxxxxxxx>
Reviewed-by: Xiaoyao Li <xiaoyao.li@xxxxxxxxx>
---
V1 -> V2: Collect tags (Zhao, Binbin), put note (Binbu), and cc @stable
---
arch/x86/kvm/cpuid.c | 1 -
arch/x86/kvm/reverse_cpuid.h | 1 -
2 files changed, 2 deletions(-)
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c
index 591d2294acd7..759a1c557080 100644
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -1082,7 +1082,6 @@ void kvm_initialize_cpu_caps(void)
F(AMX_COMPLEX_ALIAS),
F(AMX_FP16_ALIAS),
F(AMX_FP8),
- F(AMX_TF32),
F(AMX_AVX512),
F(AMX_MOVRS),
);
diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h
index 2ad25781cefb..1bb13903c5b2 100644
--- a/arch/x86/kvm/reverse_cpuid.h
+++ b/arch/x86/kvm/reverse_cpuid.h
@@ -56,7 +56,6 @@
#define X86_FEATURE_AMX_COMPLEX_ALIAS KVM_X86_FEATURE(CPUID_1E_1_EAX, 2)
#define X86_FEATURE_AMX_FP16_ALIAS KVM_X86_FEATURE(CPUID_1E_1_EAX, 3)
#define X86_FEATURE_AMX_FP8 KVM_X86_FEATURE(CPUID_1E_1_EAX, 4)
-#define X86_FEATURE_AMX_TF32 KVM_X86_FEATURE(CPUID_1E_1_EAX, 6)
#define X86_FEATURE_AMX_AVX512 KVM_X86_FEATURE(CPUID_1E_1_EAX, 7)
#define X86_FEATURE_AMX_MOVRS KVM_X86_FEATURE(CPUID_1E_1_EAX, 8)