From patchwork Thu Jun 6 07:02:25 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: 10978783 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 6B57A92A for ; Thu, 6 Jun 2019 07:45:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 60B0D20500 for ; Thu, 6 Jun 2019 07:45:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 550AB28528; Thu, 6 Jun 2019 07:45:10 +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 DFC5E287E7 for ; Thu, 6 Jun 2019 07:45:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726792AbfFFHoq (ORCPT ); Thu, 6 Jun 2019 03:44:46 -0400 Received: from mga01.intel.com ([192.55.52.88]:25012 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727017AbfFFHoo (ORCPT ); Thu, 6 Jun 2019 03:44:44 -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 00:44:38 -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 00:44:36 -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 06/12] KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest Date: Thu, 6 Jun 2019 15:02:25 +0800 Message-Id: <1559804551-42271-7-git-send-email-wei.w.wang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1559804551-42271-1-git-send-email-wei.w.wang@intel.com> References: <1559804551-42271-1-git-send-email-wei.w.wang@intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Bits [0, 5] of MSR_IA32_PERF_CAPABILITIES tell about the format of the addresses stored in the LBR stack. Expose those bits to the guest when the guest lbr feature is enabled. Signed-off-by: Wei Wang Cc: Paolo Bonzini Cc: Andi Kleen --- arch/x86/include/asm/perf_event.h | 2 ++ arch/x86/kvm/cpuid.c | 2 +- arch/x86/kvm/vmx/pmu_intel.c | 16 ++++++++++++++++ 3 files changed, 19 insertions(+), 1 deletion(-) diff --git a/arch/x86/include/asm/perf_event.h b/arch/x86/include/asm/perf_event.h index 2606100..aa77da2 100644 --- a/arch/x86/include/asm/perf_event.h +++ b/arch/x86/include/asm/perf_event.h @@ -95,6 +95,8 @@ #define PEBS_DATACFG_LBRS BIT_ULL(3) #define PEBS_DATACFG_LBR_SHIFT 24 +#define X86_PERF_CAP_MASK_LBR_FMT 0x3f + /* * Intel "Architectural Performance Monitoring" CPUID * detection/enumeration details: diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index e18a9f9..c5b4264 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -364,7 +364,7 @@ static inline int __do_cpuid_ent(struct kvm_cpuid_entry2 *entry, u32 function, F(XMM3) | F(PCLMULQDQ) | 0 /* DTES64, MONITOR */ | 0 /* DS-CPL, VMX, SMX, EST */ | 0 /* TM2 */ | F(SSSE3) | 0 /* CNXT-ID */ | 0 /* Reserved */ | - F(FMA) | F(CX16) | 0 /* xTPR Update, PDCM */ | + F(FMA) | F(CX16) | 0 /* xTPR Update*/ | F(PDCM) | F(PCID) | 0 /* Reserved, DCA */ | F(XMM4_1) | F(XMM4_2) | F(X2APIC) | F(MOVBE) | F(POPCNT) | 0 /* Reserved*/ | F(AES) | F(XSAVE) | 0 /* OSXSAVE */ | F(AVX) | diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c index f14e764..8df5e97 100644 --- a/arch/x86/kvm/vmx/pmu_intel.c +++ b/arch/x86/kvm/vmx/pmu_intel.c @@ -154,6 +154,7 @@ static bool intel_is_valid_msr(struct kvm_vcpu *vcpu, u32 msr) case MSR_CORE_PERF_GLOBAL_STATUS: case MSR_CORE_PERF_GLOBAL_CTRL: case MSR_CORE_PERF_GLOBAL_OVF_CTRL: + case MSR_IA32_PERF_CAPABILITIES: ret = pmu->version > 1; break; default: @@ -319,6 +320,19 @@ static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) case MSR_CORE_PERF_GLOBAL_OVF_CTRL: msr_info->data = pmu->global_ovf_ctrl; return 0; + case MSR_IA32_PERF_CAPABILITIES: { + u64 data; + + if (!boot_cpu_has(X86_FEATURE_PDCM) || + (!msr_info->host_initiated && + !guest_cpuid_has(vcpu, X86_FEATURE_PDCM))) + return 1; + data = native_read_msr(MSR_IA32_PERF_CAPABILITIES); + msr_info->data = 0; + if (vcpu->kvm->arch.lbr_in_guest) + msr_info->data |= (data & X86_PERF_CAP_MASK_LBR_FMT); + return 0; + } default: if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0))) { u64 val = pmc_read_counter(pmc); @@ -377,6 +391,8 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info) return 0; } break; + case MSR_IA32_PERF_CAPABILITIES: + return 1; /* RO MSR */ default: if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0))) { if (msr_info->host_initiated)