From: Wei Wang <wei.w.wang@intel.com>
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 12/12] KVM/VMX/vPMU: support to report GLOBAL_STATUS_LBRS_FROZEN
Date: Thu, 14 Feb 2019 17:06:14 +0800 [thread overview]
Message-ID: <1550135174-5423-13-git-send-email-wei.w.wang@intel.com> (raw)
In-Reply-To: <1550135174-5423-1-git-send-email-wei.w.wang@intel.com>
Arch v4 supports streamlined Freeze_LBR_on_PMI, so we set the
GLOBAL_STATUS_LBRS_FROZEN bit when the guest reads the global
status msr with freezing lbr in use.
Signed-off-by: Wei Wang <wei.w.wang@intel.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
---
arch/x86/kvm/vmx/pmu_intel.c | 21 ++++++++++++++++++++-
1 file changed, 20 insertions(+), 1 deletion(-)
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index bf40941..80d3fcf 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -420,6 +420,25 @@ static bool intel_pmu_access_lbr_msr(struct kvm_vcpu *vcpu,
return ret;
}
+static void intel_pmu_get_global_status(struct kvm_pmu *pmu,
+ struct msr_data *msr_info)
+{
+ u64 guest_debugctl, freeze_lbr_bits = DEBUGCTLMSR_FREEZE_LBRS_ON_PMI |
+ DEBUGCTLMSR_LBR;
+
+ if (!pmu->global_status) {
+ msr_info->data = 0;
+ return;
+ }
+
+ msr_info->data = pmu->global_status;
+ if (pmu->version >= 4) {
+ guest_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
+ if ((guest_debugctl & freeze_lbr_bits) == freeze_lbr_bits)
+ msr_info->data |= GLOBAL_STATUS_LBRS_FROZEN;
+ }
+}
+
static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
struct kvm_pmu *pmu = vcpu_to_pmu(vcpu);
@@ -431,7 +450,7 @@ static int intel_pmu_get_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
msr_info->data = pmu->fixed_ctr_ctrl;
return 0;
case MSR_CORE_PERF_GLOBAL_STATUS:
- msr_info->data = pmu->global_status;
+ intel_pmu_get_global_status(pmu, msr_info);
return 0;
case MSR_CORE_PERF_GLOBAL_CTRL:
msr_info->data = pmu->global_ctrl;
--
2.7.4
next prev parent reply other threads:[~2019-02-14 9:43 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-14 9:06 [PATCH v5 00/12] Guest LBR Enabling Wei Wang
2019-02-14 9:06 ` [PATCH v5 01/12] perf/x86: fix the variable type of the LBR MSRs Wei Wang
2019-02-14 9:06 ` [PATCH v5 02/12] perf/x86: add a function to get the lbr stack Wei Wang
2019-02-14 9:06 ` [PATCH v5 03/12] KVM/x86: KVM_CAP_X86_GUEST_LBR Wei Wang
2019-02-14 16:21 ` Andi Kleen
2019-02-14 9:06 ` [PATCH v5 04/12] KVM/x86: intel_pmu_lbr_enable Wei Wang
2019-02-14 9:06 ` [PATCH v5 05/12] KVM/x86/vPMU: tweak kvm_pmu_get_msr Wei Wang
2019-02-14 9:06 ` [PATCH v5 06/12] KVM/x86: expose MSR_IA32_PERF_CAPABILITIES to the guest Wei Wang
2019-02-14 9:06 ` [PATCH v5 07/12] perf/x86: no counter allocation support Wei Wang
2019-02-14 16:26 ` Andi Kleen
2019-02-15 8:49 ` Wang, Wei W
2019-02-14 9:06 ` [PATCH v5 08/12] KVM/x86/vPMU: Add APIs to support host save/restore the guest lbr stack Wei Wang
2019-02-14 9:06 ` [PATCH v5 09/12] perf/x86: save/restore LBR_SELECT on vCPU switching Wei Wang
2019-02-14 9:06 ` [PATCH v5 10/12] KVM/x86/lbr: lazy save the guest lbr stack Wei Wang
2019-02-15 1:49 ` Like Xu
2019-02-15 9:00 ` Wang, Wei W
2019-02-14 9:06 ` [PATCH v5 11/12] KVM/x86: remove the common handling of the debugctl msr Wei Wang
2019-02-14 9:06 ` Wei Wang [this message]
2019-02-14 16:31 ` [PATCH v5 12/12] KVM/VMX/vPMU: support to report GLOBAL_STATUS_LBRS_FROZEN Andi Kleen
2019-02-15 8:56 ` Wang, Wei W
2019-02-15 13:10 ` Andi Kleen
2019-02-18 1:59 ` Wei Wang
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