From nobody Mon Dec 15 23:27:04 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D8FFEC43219 for ; Thu, 10 Nov 2022 01:54:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232415AbiKJByq (ORCPT ); Wed, 9 Nov 2022 20:54:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50066 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232288AbiKJByc (ORCPT ); Wed, 9 Nov 2022 20:54:32 -0500 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8C831258; Wed, 9 Nov 2022 17:54:29 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668045269; x=1699581269; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=z3o7gjqmPQSafhqSVWDWNYduM/0WLm1c0YsgTUqZbj8=; b=BNlxJha04mKZj+TUDTo8Jvg1Mx2fDcl0GPcmfe0ET6SSEhfIdxMKHX8m y5fbx3+xbsb6bSVRHr+W4BCyWU5YcPFvmQlov9GZrRutTEqxKBlMkliS7 7WaZNUvMU6K/oAU6wmV2fp55YQmj89NTHjBwzXRJfG1YcKJuqYeIrDCcY WCHwV7wXC0gZfYTdBG/A5j656KAytLCps3kSGznSyrJVWS4O4agl53ISr nncnyCarjV9qktnKqWfLpqviXIdUy5o3kgSve0GjGqKGB1xUBsi0Ls2lV 9z3UFzlSzSpMMp7XtdQQr4xaQ97Be47OxXiC2pSgO45Wa+00zbL3iyfoN w==; X-IronPort-AV: E=McAfee;i="6500,9779,10526"; a="311180007" X-IronPort-AV: E=Sophos;i="5.96,152,1665471600"; d="scan'208";a="311180007" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Nov 2022 17:53:30 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10526"; a="762100093" X-IronPort-AV: E=Sophos;i="5.96,152,1665471600"; d="scan'208";a="762100093" Received: from jiaxichen-precision-3650-tower.sh.intel.com ([10.239.159.75]) by orsmga004.jf.intel.com with ESMTP; 09 Nov 2022 17:53:24 -0800 From: Jiaxi Chen To: kvm@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, seanjc@google.com, pbonzini@redhat.com, ndesaulniers@google.com, alexandre.belloni@bootlin.com, peterz@infradead.org, jpoimboe@kernel.org, chang.seok.bae@intel.com, pawan.kumar.gupta@linux.intel.com, babu.moger@amd.com, jmattson@google.com, sandipan.das@amd.com, tony.luck@intel.com, sathyanarayanan.kuppuswamy@linux.intel.com, fenghua.yu@intel.com, keescook@chromium.org, nathan@kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 6/7] x86: KVM: Advertise AVX-NE-CONVERT CPUID to user space Date: Thu, 10 Nov 2022 09:52:51 +0800 Message-Id: <20221110015252.202566-7-jiaxi.chen@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221110015252.202566-1-jiaxi.chen@linux.intel.com> References: <20221110015252.202566-1-jiaxi.chen@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" AVX-NE-CONVERT is a new set of instructions which can convert low precision floating point like BF16/FP16 to high precision floating point FP32, and can also convert FP32 elements to BF16. This instruction allows the platform to have improved AI capabilities and better compatibility. The bit definition: CPUID.(EAX=3D7,ECX=3D1):EDX[bit 5] This CPUID is exposed to user space. Besides, there is no other VMX control for this instruction. Signed-off-by: Jiaxi Chen --- arch/x86/kvm/cpuid.c | 3 ++- arch/x86/kvm/reverse_cpuid.h | 1 + 2 files changed, 3 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 06dacf71ff9c..47ac2a502d91 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -662,7 +662,8 @@ void kvm_set_cpu_caps(void) ); =20 kvm_cpu_cap_init_scattered(CPUID_7_1_EDX, - F(AVX_VNNI_INT8)); + F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) + ); =20 kvm_cpu_cap_mask(CPUID_D_1_EAX, F(XSAVEOPT) | F(XSAVEC) | F(XGETBV1) | F(XSAVES) | f_xfd diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h index 819b4e0b13a3..b8addd85b062 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -35,6 +35,7 @@ enum kvm_only_cpuid_leafs { =20 /* Intel-defined sub-features, CPUID level 0x00000007:1 (EDX) */ #define X86_FEATURE_AVX_VNNI_INT8 KVM_X86_FEATURE(CPUID_7_1_EDX, 4) +#define X86_FEATURE_AVX_NE_CONVERT KVM_X86_FEATURE(CPUID_7_1_EDX, 5) =20 struct cpuid_reg { u32 function; --=20 2.27.0