From: Like Xu <like.xu@linux.intel.com>
To: Peter Zijlstra <peterz@infradead.org>,
Paolo Bonzini <pbonzini@redhat.com>
Cc: Borislav Petkov <bp@alien8.de>,
Sean Christopherson <seanjc@google.com>,
Vitaly Kuznetsov <vkuznets@redhat.com>,
Wanpeng Li <wanpengli@tencent.com>,
Jim Mattson <jmattson@google.com>, Joerg Roedel <joro@8bytes.org>,
weijiang.yang@intel.com, Kan Liang <kan.liang@linux.intel.com>,
ak@linux.intel.com, wei.w.wang@intel.com, eranian@google.com,
liuxiangdong5@huawei.com, linux-kernel@vger.kernel.org,
x86@kernel.org, kvm@vger.kernel.org,
Like Xu <like.xu@linux.intel.com>
Subject: [PATCH v6 15/16] KVM: x86/cpuid: Refactor host/guest CPU model consistency check
Date: Tue, 11 May 2021 10:42:13 +0800 [thread overview]
Message-ID: <20210511024214.280733-16-like.xu@linux.intel.com> (raw)
In-Reply-To: <20210511024214.280733-1-like.xu@linux.intel.com>
For the same purpose, the leagcy intel_pmu_lbr_is_compatible() can be
renamed for reuse by more callers, and remove the comment about LBR
use case can be deleted by the way.
Signed-off-by: Like Xu <like.xu@linux.intel.com>
---
arch/x86/kvm/cpuid.h | 5 +++++
arch/x86/kvm/vmx/pmu_intel.c | 12 +-----------
arch/x86/kvm/vmx/vmx.c | 2 +-
arch/x86/kvm/vmx/vmx.h | 1 -
4 files changed, 7 insertions(+), 13 deletions(-)
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h
index c99edfff7f82..439ce776b9a0 100644
--- a/arch/x86/kvm/cpuid.h
+++ b/arch/x86/kvm/cpuid.h
@@ -143,6 +143,11 @@ static inline int guest_cpuid_model(struct kvm_vcpu *vcpu)
return x86_model(best->eax);
}
+static inline bool cpuid_model_is_consistent(struct kvm_vcpu *vcpu)
+{
+ return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
+}
+
static inline int guest_cpuid_stepping(struct kvm_vcpu *vcpu)
{
struct kvm_cpuid_entry2 *best;
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index d0610716675b..a706d3597720 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -173,16 +173,6 @@ static inline struct kvm_pmc *get_fw_gp_pmc(struct kvm_pmu *pmu, u32 msr)
return get_gp_pmc(pmu, msr, MSR_IA32_PMC0);
}
-bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu)
-{
- /*
- * As a first step, a guest could only enable LBR feature if its
- * cpu model is the same as the host because the LBR registers
- * would be pass-through to the guest and they're model specific.
- */
- return boot_cpu_data.x86_model == guest_cpuid_model(vcpu);
-}
-
bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu)
{
struct x86_pmu_lbr *lbr = vcpu_to_lbr_records(vcpu);
@@ -578,7 +568,7 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
nested_vmx_pmu_entry_exit_ctls_update(vcpu);
- if (intel_pmu_lbr_is_compatible(vcpu))
+ if (cpuid_model_is_consistent(vcpu))
x86_perf_get_lbr(&lbr_desc->records);
else
lbr_desc->records.nr = 0;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index e43d58020c75..e11efe9d2ff4 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -2306,7 +2306,7 @@ static int vmx_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
if ((data & PMU_CAP_LBR_FMT) !=
(vmx_get_perf_capabilities() & PMU_CAP_LBR_FMT))
return 1;
- if (!intel_pmu_lbr_is_compatible(vcpu))
+ if (!cpuid_model_is_consistent(vcpu))
return 1;
}
ret = kvm_set_msr_common(vcpu, msr_info);
diff --git a/arch/x86/kvm/vmx/vmx.h b/arch/x86/kvm/vmx/vmx.h
index 72f1175e474b..3afdcebb0a11 100644
--- a/arch/x86/kvm/vmx/vmx.h
+++ b/arch/x86/kvm/vmx/vmx.h
@@ -97,7 +97,6 @@ union vmx_exit_reason {
#define vcpu_to_lbr_records(vcpu) (&to_vmx(vcpu)->lbr_desc.records)
void intel_pmu_cross_mapped_check(struct kvm_pmu *pmu);
-bool intel_pmu_lbr_is_compatible(struct kvm_vcpu *vcpu);
bool intel_pmu_lbr_is_enabled(struct kvm_vcpu *vcpu);
int intel_pmu_create_guest_lbr_event(struct kvm_vcpu *vcpu);
--
2.31.1
next prev parent reply other threads:[~2021-05-11 2:44 UTC|newest]
Thread overview: 56+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-11 2:41 [PATCH v6 00/16] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS Like Xu
2021-05-11 2:41 ` [PATCH v6 01/16] perf/x86/intel: Add EPT-Friendly PEBS for Ice Lake Server Like Xu
2021-05-11 2:42 ` [PATCH v6 02/16] perf/x86/intel: Handle guest PEBS overflow PMI for KVM guest Like Xu
2021-05-17 8:16 ` Peter Zijlstra
2021-05-18 7:38 ` Xu, Like
2021-05-18 8:37 ` Peter Zijlstra
2021-05-11 2:42 ` [PATCH v6 03/16] perf/x86/core: Pass "struct kvm_pmu *" to determine the guest values Like Xu
2021-05-11 2:42 ` [PATCH v6 04/16] KVM: x86/pmu: Set MSR_IA32_MISC_ENABLE_EMON bit when vPMU is enabled Like Xu
2021-05-12 1:58 ` Venkatesh Srinivas
2021-05-12 5:00 ` Xu, Like
2021-05-12 15:18 ` Sean Christopherson
2021-05-13 2:50 ` Xu, Like
2021-05-17 18:43 ` Venkatesh Srinivas
2021-05-17 21:19 ` Sean Christopherson
2021-05-17 21:16 ` Sean Christopherson
2021-05-17 23:51 ` Sean Christopherson
2021-05-18 7:49 ` Xu, Like
2021-05-11 2:42 ` [PATCH v6 05/16] KVM: x86/pmu: Introduce the ctrl_mask value for fixed counter Like Xu
2021-05-17 8:18 ` Peter Zijlstra
2021-05-18 7:55 ` Xu, Like
2021-05-18 8:35 ` Peter Zijlstra
2021-05-11 2:42 ` [PATCH v6 06/16] KVM: x86/pmu: Add IA32_PEBS_ENABLE MSR emulation for extended PEBS Like Xu
2021-05-17 8:32 ` Peter Zijlstra
2021-05-18 8:44 ` Xu, Like
2021-05-18 13:42 ` Peter Zijlstra
2021-05-17 8:33 ` Peter Zijlstra
2021-05-18 8:13 ` Xu, Like
2021-05-11 2:42 ` [PATCH v6 07/16] KVM: x86/pmu: Reprogram PEBS event to emulate guest PEBS counter Like Xu
2021-05-17 8:39 ` Peter Zijlstra
2021-05-17 14:44 ` Andi Kleen
2021-05-18 8:47 ` Peter Zijlstra
2021-05-18 13:15 ` Xu, Like
2021-05-18 15:58 ` Andi Kleen
2021-05-17 9:14 ` Peter Zijlstra
2021-05-18 13:28 ` Xu, Like
2021-05-18 13:36 ` Peter Zijlstra
2021-05-18 14:05 ` Xu, Like
2021-05-11 2:42 ` [PATCH v6 08/16] KVM: x86/pmu: Add IA32_DS_AREA MSR emulation to support guest DS Like Xu
2021-05-12 5:16 ` Xu, Like
2021-05-17 13:26 ` Peter Zijlstra
2021-05-17 14:50 ` Andi Kleen
2021-05-11 2:42 ` [PATCH v6 09/16] KVM: x86/pmu: Add PEBS_DATA_CFG MSR emulation to support adaptive PEBS Like Xu
2021-05-11 2:42 ` [PATCH v6 10/16] KVM: x86: Set PEBS_UNAVAIL in IA32_MISC_ENABLE when PEBS is enabled Like Xu
2021-05-11 2:42 ` [PATCH v6 11/16] KVM: x86/pmu: Adjust precise_ip to emulate Ice Lake guest PDIR counter Like Xu
2021-05-11 2:42 ` [PATCH v6 12/16] KVM: x86/pmu: Move pmc_speculative_in_use() to arch/x86/kvm/pmu.h Like Xu
2021-05-11 2:42 ` [PATCH v6 13/16] KVM: x86/pmu: Disable guest PEBS temporarily in two rare situations Like Xu
2021-05-11 2:42 ` [PATCH v6 14/16] KVM: x86/pmu: Add kvm_pmu_cap to optimize perf_get_x86_pmu_capability Like Xu
2021-05-11 2:42 ` Like Xu [this message]
2021-05-11 2:42 ` [PATCH v6 16/16] KVM: x86/pmu: Expose CPUIDs feature bits PDCM, DS, DTES64 Like Xu
2021-05-15 10:30 ` [PATCH v6 00/16] KVM: x86/pmu: Add *basic* support to enable guest PEBS via DS Liuxiangdong
2021-05-17 6:38 ` Like Xu
2021-05-18 12:23 ` Liuxiangdong
2021-05-18 12:40 ` Xu, Like
2021-05-18 13:15 ` Liuxiangdong
2021-05-19 1:44 ` Liuxiangdong
2021-05-21 1:37 ` Like Xu
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