From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CD14DC433E1 for ; Tue, 25 Aug 2020 00:54:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A4C4820882 for ; Tue, 25 Aug 2020 00:54:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728350AbgHYAyF (ORCPT ); Mon, 24 Aug 2020 20:54:05 -0400 Received: from mga07.intel.com ([134.134.136.100]:44396 "EHLO mga07.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728324AbgHYAyC (ORCPT ); Mon, 24 Aug 2020 20:54:02 -0400 IronPort-SDR: VvvM+0L8VGw3xHnsYiMuOB10wfJP2+OocV8pTYyzmQP3gbdrEjqMW4jY2wSd5E8b+LZiy2RTHD uowByHh5yNbw== X-IronPort-AV: E=McAfee;i="6000,8403,9723"; a="220284916" X-IronPort-AV: E=Sophos;i="5.76,350,1592895600"; d="scan'208";a="220284916" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga105.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Aug 2020 17:54:02 -0700 IronPort-SDR: LLvBxzWhq25bkfXbFZVAzsoS6K+kmlkkiBeJ32HBDUnIVB596K7Tkalkp+Brgga3IuQliKmDeW WVSd/+KMtAuQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.76,350,1592895600"; d="scan'208";a="281351941" Received: from unknown (HELO localhost.localdomain.bj.intel.com) ([10.238.156.127]) by fmsmga008.fm.intel.com with ESMTP; 24 Aug 2020 17:53:57 -0700 From: Cathy Zhang To: kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org Cc: pbonzini@redhat.com, sean.j.christopherson@intel.com, gregkh@linuxfoundation.org, tglx@linutronix.de, tony.luck@intel.com, dave.hansen@intel.com, kyung.min.park@intel.com, ricardo.neri-calderon@linux.intel.com, vkuznets@redhat.com, wanpengli@tencent.com, jmattson@google.com, joro@8bytes.org, mingo@redhat.com, bp@alien8.de, hpa@zytor.com, jpoimboe@redhat.com, ak@linux.intel.com, ravi.v.shankar@intel.com, Cathy Zhang Subject: [PATCH v4 2/2] x86/kvm: Expose TSX Suspend Load Tracking feature Date: Tue, 25 Aug 2020 08:47:58 +0800 Message-Id: <1598316478-23337-3-git-send-email-cathy.zhang@intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1598316478-23337-1-git-send-email-cathy.zhang@intel.com> References: <1598316478-23337-1-git-send-email-cathy.zhang@intel.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org TSX suspend load tracking instruction is supported by Intel processor, Sapphire Rapids. It aims to give a way to choose which memory accesses do not need to be tracked in the TSX read set. It's availability is indicated as CPUID.(EAX=7,ECX=0):EDX[bit 16]. Expose TSX Suspend Load Address Tracking feature in KVM CPUID, so KVM could pass this information to guests and they can make use of this feature accordingly. Signed-off-by: Cathy Zhang Reviewed-by: Tony Luck --- Changes since v3: * Remove SERIALIZE part and refactor commit message.. Changes since v2: * Merge two patches into a single one. (Luck, Tony) * Add overview introduction for features. (Sean Christopherson) * Refactor commit message to explain why expose feature bits. (Luck, Tony) --- arch/x86/kvm/cpuid.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 3fd6eec..7456f9a 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -371,7 +371,7 @@ void kvm_set_cpu_caps(void) F(AVX512_4VNNIW) | F(AVX512_4FMAPS) | F(SPEC_CTRL) | F(SPEC_CTRL_SSBD) | F(ARCH_CAPABILITIES) | F(INTEL_STIBP) | F(MD_CLEAR) | F(AVX512_VP2INTERSECT) | F(FSRM) | - F(SERIALIZE) + F(SERIALIZE) | F(TSXLDTRK) ); /* TSC_ADJUST and ARCH_CAPABILITIES are emulated in software. */ -- 1.8.3.1