[PATCH 7/8][KVM nVMX]: Enable "load IA32_PERF_GLOBAL_CTRL VM-{entry,exit} controls

[Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>]

 ...based on whether the guest CPU supports PMU

Signed-off-by: Krish Sadhukhan <krish.sadhukhan@xxxxxxxxxx>
Suggested-by: Jim Mattson <jmattson@xxxxxxxxxx>
Reviewed-by: Karl Heubaum <karl.heubaum@xxxxxxxxxx>
---
 arch/x86/kvm/vmx/vmx.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 4d39f731bc33..fa9c786afcfa 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -6964,6 +6964,7 @@ static void nested_vmx_cr_fixed1_bits_update(struct kvm_vcpu *vcpu)
 static void nested_vmx_entry_exit_ctls_update(struct kvm_vcpu *vcpu)
 {
 	struct vcpu_vmx *vmx = to_vmx(vcpu);
+	bool pmu_enabled = guest_cpuid_has_pmu(vcpu);
 
 	if (kvm_mpx_supported()) {
 		bool mpx_enabled = guest_cpuid_has(vcpu, X86_FEATURE_MPX);
@@ -6976,6 +6977,17 @@ static void nested_vmx_entry_exit_ctls_update(struct kvm_vcpu *vcpu)
 			vmx->nested.msrs.exit_ctls_high &= ~VM_EXIT_CLEAR_BNDCFGS;
 		}
 	}
+	if (pmu_enabled) {
+		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 void update_intel_pt_cfg(struct kvm_vcpu *vcpu)
-- 
2.17.2