From patchwork Thu Jun 6 07:02:19 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: 10978799 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 2622514E5 for ; Thu, 6 Jun 2019 07:45:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 1CD5D201A4 for ; Thu, 6 Jun 2019 07:45:39 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 10F2B284ED; Thu, 6 Jun 2019 07:45:39 +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 92F4120500 for ; Thu, 6 Jun 2019 07:45:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726752AbfFFHoY (ORCPT ); Thu, 6 Jun 2019 03:44:24 -0400 Received: from mga01.intel.com ([192.55.52.88]:24992 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725267AbfFFHoY (ORCPT ); Thu, 6 Jun 2019 03:44:24 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 06 Jun 2019 00:44:24 -0700 X-ExtLoop1: 1 Received: from devel-ww.sh.intel.com ([10.239.48.128]) by orsmga005.jf.intel.com with ESMTP; 06 Jun 2019 00:44:21 -0700 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 v6 00/12] Guest LBR Enabling Date: Thu, 6 Jun 2019 15:02:19 +0800 Message-Id: <1559804551-42271-1-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: - perf/x86: - Patch 7: - define "no counter" as a new PERF_EV cap and keep it used in the kernel, instead of esposing it in the user ABI (if defined in perf_event_attr) - add a new API, perf_event_create, which can be used to create a perf event without counter assignment (e.g. a perf event simply to get the perf core's help of switching lbr stack on thread switching, please see patch 8) - KVM/vPMU: - Patch 8: use perf_event_create to create a perf event without the need of a perf counter - Patch 12: set the GLOBAL_STATUS_COUNTERS_FROZEN bit when injecting a vPMI. previous: https://lkml.org/lkml/2019/2/14/210 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 | 43 ++++- 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 | 29 ++- arch/x86/kvm/pmu.h | 12 +- arch/x86/kvm/pmu_amd.c | 7 +- arch/x86/kvm/vmx/pmu_intel.c | 397 +++++++++++++++++++++++++++++++++++++- arch/x86/kvm/vmx/vmx.c | 4 +- arch/x86/kvm/vmx/vmx.h | 2 + arch/x86/kvm/x86.c | 32 +-- include/linux/perf_event.h | 13 ++ include/uapi/linux/kvm.h | 1 + kernel/events/core.c | 37 ++-- 17 files changed, 574 insertions(+), 52 deletions(-)