linux-kernel - [PATCH v5 09/15] KVM: nVMX: Drop nested_vmx_pmu

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Date:   Tue,  7 Jun 2022 21:35:58 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Eric Li <ercli@...avis.edu>,
        David Matlack <dmatlack@...gle.com>,
        Oliver Upton <oupton@...gle.com>
Subject: [PATCH v5 09/15] KVM: nVMX: Drop nested_vmx_pmu_refresh()

From: Oliver Upton <oupton@...gle.com>

nested_vmx_pmu_refresh() is now unneeded, as the call to
nested_vmx_entry_exit_ctls_update() in vmx_vcpu_after_set_cpuid()
guarantees that the VM-{Entry,Exit} control MSR changes are applied
after setting CPUID. Drop all vestiges of nested_vmx_pmu_refresh().

No functional change intended.

Signed-off-by: Oliver Upton <oupton@...gle.com>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/vmx/nested.c    | 22 ----------------------
 arch/x86/kvm/vmx/nested.h    |  2 --
 arch/x86/kvm/vmx/pmu_intel.c |  3 ---
 3 files changed, 27 deletions(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index d1c21d387716..4ba0e5540908 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4847,28 +4847,6 @@ int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
 	return 0;
 }
 
-void nested_vmx_pmu_refresh(struct kvm_vcpu *vcpu,
-			    bool vcpu_has_perf_global_ctrl)
-{
-	struct vcpu_vmx *vmx;
-
-	if (!nested_vmx_allowed(vcpu))
-		return;
-
-	vmx = to_vmx(vcpu);
-	if (vcpu_has_perf_global_ctrl) {
-		vmx->nested.msrs.entry_ctls_high |=
-				VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
-		vmx->nested.msrs.exit_ctls_high |=
-				VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
-	} else {
-		vmx->nested.msrs.entry_ctls_high &=
-				~VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL;
-		vmx->nested.msrs.exit_ctls_high &=
-				~VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL;
-	}
-}
-
 static int nested_vmx_get_vmptr(struct kvm_vcpu *vcpu, gpa_t *vmpointer,
 				int *ret)
 {
diff --git a/arch/x86/kvm/vmx/nested.h b/arch/x86/kvm/vmx/nested.h
index 129ae4e01f7c..88b00a7359e4 100644
--- a/arch/x86/kvm/vmx/nested.h
+++ b/arch/x86/kvm/vmx/nested.h
@@ -32,8 +32,6 @@ int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);
 int vmx_get_vmx_msr(struct nested_vmx_msrs *msrs, u32 msr_index, u64 *pdata);
 int get_vmx_mem_address(struct kvm_vcpu *vcpu, unsigned long exit_qualification,
 			u32 vmx_instruction_info, bool wr, int len, gva_t *ret);
-void nested_vmx_pmu_refresh(struct kvm_vcpu *vcpu,
-			    bool vcpu_has_perf_global_ctrl);
 void nested_mark_vmcs12_pages_dirty(struct kvm_vcpu *vcpu);
 bool nested_vmx_check_io_bitmaps(struct kvm_vcpu *vcpu, unsigned int port,
 				 int size);
diff --git a/arch/x86/kvm/vmx/pmu_intel.c b/arch/x86/kvm/vmx/pmu_intel.c
index 6ce3b066f7d9..515ab6594333 100644
--- a/arch/x86/kvm/vmx/pmu_intel.c
+++ b/arch/x86/kvm/vmx/pmu_intel.c
@@ -597,9 +597,6 @@ static void intel_pmu_refresh(struct kvm_vcpu *vcpu)
 	bitmap_set(pmu->all_valid_pmc_idx,
 		INTEL_PMC_MAX_GENERIC, pmu->nr_arch_fixed_counters);
 
-	nested_vmx_pmu_refresh(vcpu,
-			       intel_is_valid_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL, false));
-
 	if (cpuid_model_is_consistent(vcpu))
 		x86_perf_get_lbr(&lbr_desc->records);
 	else
-- 
2.36.1.255.ge46751e96f-goog