From patchwork Thu Feb 14 09:06:02 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Wei W" X-Patchwork-Id: 10812161 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 059F013BF for ; Thu, 14 Feb 2019 09:44:45 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E9AEE2D85E for ; Thu, 14 Feb 2019 09:44:44 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id DD7E52D863; Thu, 14 Feb 2019 09:44:44 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7D5542D85E for ; Thu, 14 Feb 2019 09:44:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729725AbfBNJmr (ORCPT ); Thu, 14 Feb 2019 04:42:47 -0500 Received: from mga09.intel.com ([134.134.136.24]:32197 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726106AbfBNJmr (ORCPT ); Thu, 14 Feb 2019 04:42:47 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga102.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 14 Feb 2019 01:42:46 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.58,368,1544515200"; d="scan'208";a="124411677" Received: from devel-ww.sh.intel.com ([10.239.48.128]) by fmsmga008.fm.intel.com with ESMTP; 14 Feb 2019 01:42:44 -0800 From: Wei Wang To: linux-kernel@vger.kernel.org, kvm@vger.kernel.org, pbonzini@redhat.com, ak@linux.intel.com, peterz@infradead.org Cc: kan.liang@intel.com, mingo@redhat.com, rkrcmar@redhat.com, like.xu@intel.com, wei.w.wang@intel.com, jannh@google.com, arei.gonglei@huawei.com, jmattson@google.com Subject: [PATCH v5 00/12] Guest LBR Enabling Date: Thu, 14 Feb 2019 17:06:02 +0800 Message-Id: <1550135174-5423-1-git-send-email-wei.w.wang@intel.com> X-Mailer: git-send-email 2.7.4 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Last Branch Recording (LBR) is a performance monitor unit (PMU) feature on Intel CPUs that captures branch related info. This patch series enables this feature to KVM guests. Here is a conclusion of the fundamental methods that we use: 1) the LBR feature is enabled per guest via QEMU setting of KVM_CAP_X86_GUEST_LBR; 2) the LBR stack is passed through to the guest for direct accesses after the guest's first access to any of the lbr related MSRs; 3) the host will help save/resotre the LBR stack when the vCPU is scheduled out/in. ChangeLog: - KVM/x86: - patch 4: enable guest lbr when guest lbr msr index and host lbr msr index matches; - patch 5: change kvm_pmu_get_msr to get the msr_data struct; - patch 8: remove the PF_VCPU and is_kernel_event check; - patch 10: - move the lbr virtualization code from vmx.c to pmu_intel.c; - save the lbr stack even when the guest is not using the user callstack mode in case some tools (e.g. autofdo) complain for bogus samples; - patch 11: remove the common handling of the debugctl; - patch 12: support to report GLOBAL_STATUS_LBRS_FROZEN. previous: https://lkml.org/lkml/2018/12/26/82 Like Xu (1): KVM/x86/vPMU: Add APIs to support host save/restore the guest lbr stack Wei Wang (11): perf/x86: fix the variable type of the LBR MSRs perf/x86: add a function to get the lbr stack KVM/x86: KVM_CAP_X86_GUEST_LBR KVM/x86: intel_pmu_lbr_enable KVM/x86/vPMU: tweak kvm_pmu_get_msr KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest perf/x86: no counter allocation support perf/x86: save/restore LBR_SELECT on vCPU switching KVM/x86/lbr: lazy save the guest lbr stack KVM/x86: remove the common handling of the debugctl msr KVM/VMX/vPMU: support to report GLOBAL_STATUS_LBRS_FROZEN arch/x86/events/core.c | 12 ++ arch/x86/events/intel/lbr.c | 42 +++- arch/x86/events/perf_event.h | 6 +- arch/x86/include/asm/kvm_host.h | 5 + arch/x86/include/asm/perf_event.h | 16 ++ arch/x86/kvm/cpuid.c | 2 +- arch/x86/kvm/cpuid.h | 8 + arch/x86/kvm/pmu.c | 18 +- arch/x86/kvm/pmu.h | 11 +- arch/x86/kvm/pmu_amd.c | 7 +- arch/x86/kvm/vmx/pmu_intel.c | 398 +++++++++++++++++++++++++++++++++++++- arch/x86/kvm/vmx/vmx.c | 4 +- arch/x86/kvm/vmx/vmx.h | 2 + arch/x86/kvm/x86.c | 33 ++-- include/linux/perf_event.h | 5 + include/uapi/linux/kvm.h | 1 + include/uapi/linux/perf_event.h | 3 +- 17 files changed, 535 insertions(+), 38 deletions(-)