From nobody Fri Dec 19 16:59:21 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 44415C433FE for ; Thu, 3 Nov 2022 02:51:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231381AbiKCCvj (ORCPT ); Wed, 2 Nov 2022 22:51:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231339AbiKCCvU (ORCPT ); Wed, 2 Nov 2022 22:51:20 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A271814036; Wed, 2 Nov 2022 19:51:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667443860; x=1698979860; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=qDIvJKQbDJZne66SN3OTzm4SJ9/jbIpx8cLqn7z/wuU=; b=iz/GVGE5QBtI4TYG4NahYz0/f/T7FIlc9l7j4ami0KHFb8gj9AYA/l06 Ex2pG/CNpPSc7KlrjUWAStNs6t3L4z9CZoPxdu5qTmP530fAGeZhvPLdE P6b9hcqYuJT5+T83uJXVGZAzwIzorhlZ38ebCCXCdWQzingg7upTAxq0G Kxc5MFSsMcd5nboKVQ16yUAP0N1wG7Oen3qEnbDqLGErTeoGlm4SkiKOl p9E2RxN85ttR2l0pCrGzVOQ2B1SHbxgyZhYSB8wAG66bjHxwkyQ1KbA7l IThtwJ/IGmV6/F8i8Hy+Ume8fqwlvgfEQe9CZln+BGMS9M1Jf0FW8xqby w==; X-IronPort-AV: E=McAfee;i="6500,9779,10519"; a="307186647" X-IronPort-AV: E=Sophos;i="5.95,235,1661842800"; d="scan'208";a="307186647" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 02 Nov 2022 19:51:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10519"; a="698047904" X-IronPort-AV: E=Sophos;i="5.95,235,1661842800"; d="scan'208";a="698047904" Received: from jiaxichen-precision-3650-tower.sh.intel.com ([10.239.159.75]) by fmsmga008.fm.intel.com with ESMTP; 02 Nov 2022 19:50:55 -0700 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 v2 5/8] x86: KVM: Advertise AVX-IFMA CPUID to user space Date: Thu, 3 Nov 2022 10:50:27 +0800 Message-Id: <20221103025030.78371-6-jiaxi.chen@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221103025030.78371-1-jiaxi.chen@linux.intel.com> References: <20221103025030.78371-1-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-IFMA is a new instruction in the latest Intel platform Sierra Forest. This instruction packed multiplies unsigned 52-bit integers and adds the low/high 52-bit products to Qword Accumulators. The bit definition: CPUID.(EAX=3D7,ECX=3D1):EAX[bit 23] 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 19ef02d5b11b..e84c6216a72c 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -657,7 +657,8 @@ void kvm_set_cpu_caps(void) kvm_cpu_cap_set(X86_FEATURE_SPEC_CTRL_SSBD); =20 kvm_cpu_cap_init_scattered(CPUID_7_1_EAX, - F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) + F(AVX_VNNI) | F(AVX512_BF16) | F(CMPCCXADD) | F(AMX_FP16) | + F(AVX_IFMA) ); =20 kvm_cpu_cap_mask(CPUID_D_1_EAX, diff --git a/arch/x86/kvm/reverse_cpuid.h b/arch/x86/kvm/reverse_cpuid.h index 05fd43ebd226..954c0ceb1e90 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -30,6 +30,7 @@ enum kvm_only_cpuid_leafs { #define X86_FEATURE_AVX512_BF16 KVM_X86_FEATURE(CPUID_7_1_EAX, 5) #define X86_FEATURE_CMPCCXADD KVM_X86_FEATURE(CPUID_7_1_EAX, 7) #define X86_FEATURE_AMX_FP16 KVM_X86_FEATURE(CPUID_7_1_EAX, 21) +#define X86_FEATURE_AVX_IFMA KVM_X86_FEATURE(CPUID_7_1_EAX, 23) =20 struct cpuid_reg { u32 function; --=20 2.27.0