From nobody Fri Dec 19 16:03:32 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 8531CC433FE for ; Fri, 18 Nov 2022 14:16:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242233AbiKROQZ (ORCPT ); Fri, 18 Nov 2022 09:16:25 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50074 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242342AbiKROPx (ORCPT ); Fri, 18 Nov 2022 09:15:53 -0500 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D37126E549; Fri, 18 Nov 2022 06:15:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668780939; x=1700316939; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=iL9Gulkfj53aq2blQeCaJJySqTu7PhbaVSFImCV2Zpk=; b=Yqmj/TSHWbvo7nK1I9TFB8NVWgMCLLA0pf2+07M4vnLnqwt4aXyD7KN5 8/m3Hk4heoldE9DUfWfiyEHib5fkiqegGHxoWDsnSFG69QNOrk8Ob7DnW 1nYcRliW38acsDwvwp1rT+gWpWZZZjVx8Dw9cQiYKv9198iQQwAEa62f8 uUe8bmzCq7POa63W14aM2aEREVevB0QcxMKy5PdLY5bX8SjDg8iBM8RA8 QtY54sPE+bIMgbfZzrj2EsL2RxIyrgY3bTpZUVcH0QjEo7jYHiJ23mVXO G6SAPhjikvUo8QMzU+dHL+RmqpaAPsx1RuQsgZEPNt5zucT1Ck/PBOuSI w==; X-IronPort-AV: E=McAfee;i="6500,9779,10535"; a="339982428" X-IronPort-AV: E=Sophos;i="5.96,174,1665471600"; d="scan'208";a="339982428" Received: from orsmga001.jf.intel.com ([10.7.209.18]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 Nov 2022 06:15:39 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10535"; a="673204507" X-IronPort-AV: E=Sophos;i="5.96,174,1665471600"; d="scan'208";a="673204507" Received: from jiaxichen-precision-3650-tower.sh.intel.com ([10.239.159.75]) by orsmga001.jf.intel.com with ESMTP; 18 Nov 2022 06:15:33 -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 v4 6/6] x86: KVM: Advertise PREFETCHIT0/1 CPUID to user space Date: Fri, 18 Nov 2022 22:15:09 +0800 Message-Id: <20221118141509.489359-7-jiaxi.chen@linux.intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221118141509.489359-1-jiaxi.chen@linux.intel.com> References: <20221118141509.489359-1-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" Latest Intel platform Granite Rapids has introduced a new instruction - PREFETCHIT0/1, which moves code to memory (cache) closer to the processor depending on specific hints. The bit definition: CPUID.(EAX=3D7,ECX=3D1):EDX[bit 14] 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 | 2 +- arch/x86/kvm/reverse_cpuid.h | 1 + 2 files changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index f87292ae69d2..35eaee40c1bb 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -661,7 +661,7 @@ void kvm_set_cpu_caps(void) F(AVX_IFMA)); =20 kvm_cpu_cap_init_scattered(CPUID_7_1_EDX, - F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) + F(AVX_VNNI_INT8) | F(AVX_NE_CONVERT) | F(PREFETCHITI) ); =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 d0fc43c3b2fd..49bb06163fb4 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -28,6 +28,7 @@ enum kvm_only_cpuid_leafs { /* 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) +#define X86_FEATURE_PREFETCHITI KVM_X86_FEATURE(CPUID_7_1_EDX, 14) =20 struct cpuid_reg { u32 function; --=20 2.27.0