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From: Like Xu <like.xu@linux.intel.com>
To: peterz@infradead.org, Paolo Bonzini <pbonzini@redhat.com>,
	Sean Christopherson <seanjc@google.com>
Cc: andi@firstfloor.org, kan.liang@linux.intel.com,
	wei.w.wang@intel.com, eranian@google.com,
	liuxiangdong5@huawei.com, Vitaly Kuznetsov <vkuznets@redhat.com>,
	Wanpeng Li <wanpengli@tencent.com>,
	Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
	kvm@vger.kernel.org, x86@kernel.org,
	linux-kernel@vger.kernel.org, Like Xu <like.xu@linux.intel.com>,
	Yao Yuan <yuan.yao@intel.com>
Subject: [PATCH v5 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled
Date: Thu, 15 Apr 2021 11:20:04 +0800	[thread overview]
Message-ID: <20210415032016.166201-5-like.xu@linux.intel.com> (raw)
In-Reply-To: <20210415032016.166201-1-like.xu@linux.intel.com>

On Intel platforms, the software can use the IA32_MISC_ENABLE[7] bit to
detect whether the processor supports performance monitoring facility.

It depends on the PMU is enabled for the guest, and a software write
operation to this available bit will be ignored.

Cc: Yao Yuan <yuan.yao@intel.com>
Signed-off-by: Like Xu <like.xu@linux.intel.com>
---
 arch/x86/kvm/vmx/pmu_intel.c | 1 +
 arch/x86/kvm/x86.c           | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 9efc1a6b8693..d9dbebe03cae 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -488,6 +488,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 	if (!pmu->version)
 		return;
 
+	vcpu->arch.ia32_misc_enable_msr |= MSR_IA32_MISC_ENABLE_EMON;
 	perf_get_x86_pmu_capability(&x86_pmu);
 
 	pmu->nr_arch_gp_counters = min_t(int, eax.split.num_counters,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 16fb39503296..1a64e816e06d 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3125,6 +3125,7 @@ int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
 		}
 		break;
 	case MSR_IA32_MISC_ENABLE:
+		data &= ~MSR_IA32_MISC_ENABLE_EMON;
 		if (!kvm_check_has_quirk(vcpu->kvm, KVM_X86_QUIRK_MISC_ENABLE_NO_MWAIT) &&
 		    ((vcpu->arch.ia32_misc_enable_msr ^ data) & MSR_IA32_MISC_ENABLE_MWAIT)) {
 			if (!guest_cpuid_has(vcpu, X86_FEATURE_XMM3))
-- 
2.30.2


  parent reply	other threads:[~2021-04-15  3:20 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-15  3:20 [PATCH v5 00/16] KVM: x86/pmu: Add basic support to enable guest PEBS via DS Like Xu
2021-04-15  3:20 ` [PATCH v5 01/16] perf/x86/intel: Add EPT-Friendly PEBS for Ice Lake Server Like Xu
2021-04-15  3:20 ` [PATCH v5 02/16] perf/x86/intel: Handle guest PEBS overflow PMI for KVM guest Like Xu
2021-04-15  3:20 ` [PATCH v5 03/16] perf/x86/core: Pass "struct kvm_pmu *" to determine the guest values Like Xu
2021-04-15  3:20 ` Like Xu [this message]
2021-04-15  3:20 ` [PATCH v5 05/16] KVM: x86/pmu: Introduce the ctrl_mask value for fixed counter Like Xu
2021-04-15  3:20 ` [PATCH v5 06/16] KVM: x86/pmu: Reprogram PEBS event to emulate guest PEBS counter Like Xu
2021-04-19  8:11   ` Liuxiangdong
2021-04-19  8:17     ` Xu, Like
2021-04-15  3:20 ` [PATCH v5 07/16] KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS Like Xu
2021-04-15  3:20 ` [PATCH v5 08/16] KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS Like Xu
2021-04-15  3:20 ` [PATCH v5 09/16] KVM: x86/pmu: Add PEBS_DATA_CFG MSR emulation to support adaptive PEBS Like Xu
2021-04-15  3:20 ` [PATCH v5 10/16] KVM: x86: Set PEBS_UNAVAIL in IA32_MISC_ENABLE when PEBS is enabled Like Xu
2021-04-20  8:30   ` Liuxiangdong
2021-04-20  8:41     ` Xu, Like
2021-04-15  3:20 ` [PATCH v5 11/16] KVM: x86/pmu: Adjust precise_ip to emulate Ice Lake guest PDIR counter Like Xu
2021-04-15  3:20 ` [PATCH v5 12/16] KVM: x86/pmu: Move pmc_speculative_in_use() to arch/x86/kvm/pmu.h Like Xu
2021-04-15  3:20 ` [PATCH v5 13/16] KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations Like Xu
2021-04-15  3:20 ` [PATCH v5 14/16] KVM: x86/pmu: Add kvm_pmu_cap to optimize perf_get_x86_pmu_capability Like Xu
2021-04-15  3:20 ` [PATCH v5 15/16] KVM: x86/cpuid: Refactor host/guest CPU model consistency check Like Xu
2021-04-15  3:20 ` [PATCH v5 16/16] KVM: x86/pmu: Expose CPUIDs feature bits PDCM, DS, DTES64 Like Xu

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