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 3831CC4332F for ; Thu, 10 Nov 2022 01:55:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232460AbiKJBzV (ORCPT ); Wed, 9 Nov 2022 20:55:21 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50606 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232471AbiKJBy6 (ORCPT ); Wed, 9 Nov 2022 20:54:58 -0500 Received: from mga18.intel.com (mga18.intel.com [134.134.136.126]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3541A29CB7; Wed, 9 Nov 2022 17:54:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668045297; x=1699581297; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=JwR3352mQmtvv3jNZ1XhkuwmOLMITQeiSm1roomzunE=; b=ZXfVE4Yb05m6NPFUCyDK6lApk9Au3uFRXaqPRw3PcRBn7gLzb4/ypK37 gXsqU4Rqta/XCPceGJ3Uk/hfHMGfC93jQptBayxaqXd9SuShtxqyN79sz R95Ueb8jHURgnvG63OpUTYMZPYqYWdZbKPYrXg1mC2om3gnJ3jZ9FKSwk T8LUsS7bw1G7ZvsN/1oJFI6wZsIC6XuacsO9gtiAsGVJtcfynbuHZ/dQT soUprHNdHjlQ0SGLjy1RC1KHcoSzS/DUV2bhkN1cnbdnn8NsUtGrZM17/ /IUeSPhzi2JtHV3okZCDwMRAdxhBviKWhPybOQp591qf+mB5d5t7z9WqN g==; X-IronPort-AV: E=McAfee;i="6500,9779,10526"; a="294522235" X-IronPort-AV: E=Sophos;i="5.96,152,1665471600"; d="scan'208";a="294522235" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 09 Nov 2022 17:53:35 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6500,9779,10526"; a="762100153" X-IronPort-AV: E=Sophos;i="5.96,152,1665471600"; d="scan'208";a="762100153" Received: from jiaxichen-precision-3650-tower.sh.intel.com ([10.239.159.75]) by orsmga004.jf.intel.com with ESMTP; 09 Nov 2022 17:53:30 -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 7/7] x86: KVM: Advertise PREFETCHIT0/1 CPUID to user space Date: Thu, 10 Nov 2022 09:52:52 +0800 Message-Id: <20221110015252.202566-8-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" 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 47ac2a502d91..9021a80b3553 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -662,7 +662,7 @@ void kvm_set_cpu_caps(void) ); =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 b8addd85b062..884aebe7b3c2 100644 --- a/arch/x86/kvm/reverse_cpuid.h +++ b/arch/x86/kvm/reverse_cpuid.h @@ -36,6 +36,7 @@ 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