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=-11.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,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 B91F8C433E0 for ; Sun, 14 Mar 2021 16:01:08 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 805D964EB3 for ; Sun, 14 Mar 2021 16:01:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234074AbhCNQAl (ORCPT ); Sun, 14 Mar 2021 12:00:41 -0400 Received: from mga14.intel.com ([192.55.52.115]:7144 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233954AbhCNQAY (ORCPT ); Sun, 14 Mar 2021 12:00:24 -0400 IronPort-SDR: QX1qUo1jcsLHFJqVRXIiL3iwEXcLBWgsfoSKWe8DnMeCR5kEv/SBfhRvBtA4pc0zpYmxLynTzB 3Oa1f9EWEN2A== X-IronPort-AV: E=McAfee;i="6000,8403,9923"; a="188360673" X-IronPort-AV: E=Sophos;i="5.81,248,1610438400"; d="scan'208";a="188360673" Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2021 09:00:24 -0700 IronPort-SDR: DuMjBQcR2N5j/obQBCYBrcVYHJUINWmRCEXd5PJzZgipP2vcDnBzAlN8JK8JmjMHQsHe9rYwzX /A3mrFyeyI8Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.81,248,1610438400"; d="scan'208";a="439530579" Received: from clx-ap-likexu.sh.intel.com ([10.239.48.108]) by FMSMGA003.fm.intel.com with ESMTP; 14 Mar 2021 09:00:21 -0700 From: Like Xu To: Paolo Bonzini , Sean Christopherson Cc: Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, x86@kernel.org, wei.w.wang@intel.com, linux-kernel@vger.kernel.org, Like Xu Subject: [PATCH v4 00/11] KVM: x86/pmu: Guest Architectural LBR Enabling Date: Sun, 14 Mar 2021 23:52:13 +0800 Message-Id: <20210314155225.206661-1-like.xu@linux.intel.com> X-Mailer: git-send-email 2.29.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Hi geniuses, Please help review the new version of Arch LBR enabling patch set. The Architectural Last Branch Records (LBRs) is publiced in the 319433-040 release of Intel Architecture Instruction Set Extensions and Future Features Programming Reference[0]. The main advantages for the Arch LBR users are [1]: - Faster context switching due to XSAVES support and faster reset of LBR MSRs via the new DEPTH MSR - Faster LBR read for a non-PEBS event due to XSAVES support, which lowers the overhead of the NMI handler. - Linux kernel can support the LBR features without knowing the model number of the current CPU. It's based on the kvm/queue tree plus two commits from kvm/intel tree: - 'fea4ab260645 ("KVM: x86: Refresh CPUID on writes to MSR_IA32_XSS")' - '0ccd14126cb2 ("KVM: x86: Report XSS as an MSR to be saved if there are supported features")' Please check more details in each commit and feel free to comment. [0] https://software.intel.com/content/www/us/en/develop/download/ intel-architecture-instruction-set-extensions-and-future-features-programming-reference.html [1] https://lore.kernel.org/lkml/1593780569-62993-1-git-send-email-kan.liang@linux.intel.com/ --- v3->v4 Changelog: - Add one more host patch to reuse ARCH_LBR_CTL_MASK; - Add reserve_lbr_buffers() instead of using GFP_ATOMIC; - Fia a bug in the arch_lbr_depth_is_valid(); - Add LBR_CTL_EN to unify DEBUGCTLMSR_LBR and ARCH_LBR_CTL_LBREN; - Add vmx->host_lbrctlmsr to save/restore host values; - Add KVM_SUPPORTED_XSS to refactoring supported_xss; - Clear Arch_LBR ans its XSS bit if it's not supported; - Add negative testing to the related kvm-unit-tests; - Refine code and commit messages; Previous: https://lore.kernel.org/kvm/20210303135756.1546253-1-like.xu@linux.intel.com/ Like Xu (11): perf/x86/intel: Fix the comment about guest LBR support on KVM perf/x86/lbr: Simplify the exposure check for the LBR_INFO registers perf/x86/lbr: Skip checking for the existence of LBR_TOS for Arch LBR perf/x86/lbr: Move cpuc->lbr_xsave allocation out of sleeping region perf/x86: Move ARCH_LBR_CTL_MASK definition to include/asm/msr-index.h KVM: vmx/pmu: Add MSR_ARCH_LBR_DEPTH emulation for Arch LBR KVM: vmx/pmu: Add MSR_ARCH_LBR_CTL emulation for Arch LBR KVM: vmx/pmu: Add Arch LBR emulation and its VMCS field KVM: x86: Expose Architectural LBR CPUID leaf KVM: x86: Refine the matching and clearing logic for supported_xss KVM: x86: Add XSAVE Support for Architectural LBRs arch/x86/events/core.c | 8 ++- arch/x86/events/intel/bts.c | 2 +- arch/x86/events/intel/core.c | 6 +- arch/x86/events/intel/lbr.c | 28 +++++---- arch/x86/events/perf_event.h | 8 ++- arch/x86/include/asm/msr-index.h | 1 + arch/x86/include/asm/vmx.h | 4 ++ arch/x86/kvm/cpuid.c | 25 +++++++- arch/x86/kvm/vmx/capabilities.h | 25 +++++--- arch/x86/kvm/vmx/pmu_intel.c | 103 ++++++++++++++++++++++++++++--- arch/x86/kvm/vmx/vmx.c | 50 +++++++++++++-- arch/x86/kvm/vmx/vmx.h | 4 ++ arch/x86/kvm/x86.c | 6 +- 13 files changed, 227 insertions(+), 43 deletions(-) -- 2.29.2