From nobody Sat Jul 25 01:52:31 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 913743859F5; Mon, 20 Jul 2026 21:18:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.15 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784582297; cv=none; b=nRQRloQR1m2+DEe/8q2G3earrPstq89POHxcFfIrbNFygQW4Dj/2wXOY+DKw3LUnpSWdk77FUHVMH+7TistPYZRk0xCspWu9vLNnzUYRwZ8ytm8jAjg5YAEdNBtERlJapmQh2KjJOkWML9SJFEt2EBhJcGAI9eGgjWRz/EAbr5U= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784582297; c=relaxed/simple; bh=2yfJp9DjgxEbuglj+KrflocPRFfWEuOdSx58mNXP0q8=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=CAIPzTaCcEHVW6iMhX1YHpqS2TTAxPShRbgKEA/Vo/ENnVwGM3I/k3jWYraMw6HqYU2dt/UI3bMg8oYYS6yudsJoEtixAXZj2feTZhX9CVi4NQseiJ98fq28Ea+kIPRux9m2Y+aSqweiDGksSOoBUOfYNfLCANM56+7FHvnJ6i4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=DcYi5wt1; arc=none smtp.client-ip=198.175.65.15 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="DcYi5wt1" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1784582295; x=1816118295; h=from:to:cc:subject:date:message-id:mime-version: content-transfer-encoding; bh=2yfJp9DjgxEbuglj+KrflocPRFfWEuOdSx58mNXP0q8=; b=DcYi5wt1oH/oCP1G7O1otd0W48yyZpXziTqpKZa3RTGhGFJbpl5RGm5D MCjEqZyqBKSeKl48+QjG7KokiMNrxh2DFQ4jaWHLt3/LC6NXItSEygIyP IUyyugZmwVDH5tZRdPzZypLyB57mH8US+4KQIfbBLi6rCPGLHJHO61hFa CPizLesWYpot7qj+EfvMQN+zH7vBNklojkgRanD9kfwDi+HuXcpqpbjz+ GyU9pCgaP2LE0WtxNrleuLHOAuCrG7gI99Fvp3sa37kHXg1j1dfc/zus0 FQjj2zDyDcMQcYrzNkunQndG1x2ROc5n8SCYOYF4tBty5elZ4dZEQp5v2 Q==; X-CSE-ConnectionGUID: kHnte9STS4u1Ni6iz/5RxQ== X-CSE-MsgGUID: J7A3XBLEQpmUIruLKyUW5A== X-IronPort-AV: E=McAfee;i="6800,10657,11852"; a="88850241" X-IronPort-AV: E=Sophos;i="6.25,175,1779174000"; d="scan'208";a="88850241" Received: from orviesa004.jf.intel.com ([10.64.159.144]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Jul 2026 14:18:15 -0700 X-CSE-ConnectionGUID: QBRMasMbStCDPgTEBGCWCQ== X-CSE-MsgGUID: yciFYR2fQ1O6y5BcFp3BQA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.25,175,1779174000"; d="scan'208";a="261359644" Received: from chang-linux-3.sc.intel.com (HELO chang-linux-3) ([172.25.66.174]) by orviesa004.jf.intel.com with ESMTP; 20 Jul 2026 14:18:15 -0700 From: "Chang S. Bae" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, pbonzini@redhat.com, seanjc@google.com, chang.seok.bae@intel.com, stable@vger.kernel.org, Zhao Liu , Binbin Wu Subject: [PATCH v2] KVM: x86: Remove AMX-TF32 enumeration Date: Mon, 20 Jul 2026 20:52:08 +0000 Message-ID: <20260720205208.519622-1-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" 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. Cc: stable@vger.kernel.org # v6.20+ Reviewed-by: Zhao Liu Reviewed-by: Binbin Wu Signed-off-by: Chang S. Bae Reviewed-by: Xiaoyao Li --- 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) =20 --=20 2.53.0