From: Peter Zijlstra <peterz@infradead.org>
To: Like Xu <like.xu@linux.intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
Sean Christopherson <sean.j.christopherson@intel.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
ak@linux.intel.com, wei.w.wang@intel.com
Subject: Re: [PATCH v11 07/11] KVM: x86: Expose MSR_IA32_PERF_CAPABILITIES for LBR record format
Date: Tue, 19 May 2020 12:53:35 +0200 [thread overview]
Message-ID: <20200519105335.GF279861@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20200514083054.62538-8-like.xu@linux.intel.com>
On Thu, May 14, 2020 at 04:30:50PM +0800, Like Xu wrote:
> @@ -203,6 +206,12 @@ 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:
> + if (!msr_info->host_initiated &&
> + !guest_cpuid_has(vcpu, X86_FEATURE_PDCM))
> + return 1;
I know this is KVM code, so maybe they feel differently, but I find the
above indentation massively confusing. Consider using: "set cino=:0(0"
if you're a vim user.
> + msr_info->data = vcpu->arch.perf_capabilities;
> + return 0;
> default:
> if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0))) {
> u64 val = pmc_read_counter(pmc);
> @@ -261,6 +270,16 @@ static int intel_pmu_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
> return 0;
> }
> break;
> + case MSR_IA32_PERF_CAPABILITIES:
> + if (!msr_info->host_initiated ||
> + !guest_cpuid_has(vcpu, X86_FEATURE_PDCM))
> + return 1;
Idem.
> + if (!(data & ~vmx_get_perf_capabilities()))
> + return 1;
> + if ((data ^ vmx_get_perf_capabilities()) & PERF_CAP_LBR_FMT)
> + return 1;
> + vcpu->arch.perf_capabilities = data;
> + return 0;
> default:
> if ((pmc = get_gp_pmc(pmu, msr, MSR_IA32_PERFCTR0))) {
> if (!msr_info->host_initiated)
next prev parent reply other threads:[~2020-05-19 10:53 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-14 8:30 [PATCH v11 00/11] Guest Last Branch Recording Enabling Like Xu
2020-05-14 8:30 ` [PATCH v11 01/11] perf/x86: Fix variable types for LBR registers Like Xu
2020-05-14 8:30 ` [PATCH v11 02/11] perf/x86/core: Refactor hw->idx checks and cleanup Like Xu
2020-05-14 8:30 ` [PATCH v11 03/11] perf/x86/lbr: Add interface to get basic information about LBR stack Like Xu
2020-05-14 8:30 ` [PATCH v11 04/11] perf/x86: Add constraint to create guest LBR event without hw counter Like Xu
2020-05-18 11:43 ` Peter Zijlstra
2020-05-14 8:30 ` [PATCH v11 05/11] perf/x86: Keep LBR stack unchanged in host context for guest LBR event Like Xu
2020-05-18 11:59 ` Peter Zijlstra
2020-05-18 12:02 ` Peter Zijlstra
2020-05-19 3:08 ` Like Xu
2020-05-19 10:45 ` Peter Zijlstra
2020-05-19 13:25 ` Xu, Like
2020-05-14 8:30 ` [PATCH v11 06/11] KVM: x86/pmu: Tweak kvm_pmu_get_msr to pass 'struct msr_data' in Like Xu
2020-05-14 8:30 ` [PATCH v11 07/11] KVM: x86: Expose MSR_IA32_PERF_CAPABILITIES for LBR record format Like Xu
2020-05-19 10:53 ` Peter Zijlstra [this message]
2020-05-19 12:19 ` Xu, Like
2020-05-19 15:12 ` Sean Christopherson
2020-05-14 8:30 ` [PATCH v11 08/11] KVM: x86/pmu: Emulate LBR feature via guest LBR event Like Xu
2020-05-19 11:00 ` Peter Zijlstra
2020-05-19 12:24 ` Xu, Like
2020-05-19 11:01 ` Peter Zijlstra
2020-05-19 12:28 ` Xu, Like
2020-05-19 11:03 ` Peter Zijlstra
2020-05-19 12:40 ` Xu, Like
2020-05-14 8:30 ` [PATCH v11 09/11] KVM: x86/pmu: Release guest LBR event via vPMU lazy release mechanism Like Xu
2020-05-14 8:30 ` [PATCH v11 10/11] KVM: x86/pmu: Check guest LBR availability in case host reclaims them Like Xu
2020-05-19 11:15 ` Peter Zijlstra
2020-05-19 13:10 ` Xu, Like
2020-05-19 14:57 ` Peter Zijlstra
2020-05-20 2:01 ` Xu, Like
2020-05-27 8:17 ` Like Xu
2020-05-14 8:30 ` [PATCH v11 11/11] KVM: x86/pmu: Reduce the overhead of LBR passthrough or cancellation Like Xu
2020-05-27 8:28 ` [PATCH v11 00/11] Guest Last Branch Recording Enabling Xu, Like
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