KVM: x86: Check for Intel PT MSR virtualization using KVM cpu caps

Use kvm_cpu_cap_has() to check for Intel PT when processing the list of
virtualized MSRs to pave the way toward removing ->pt_supported().

No functional change intended.
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/x86.c

@@ -5220,23 +5220,23 @@ static void kvm_init_msr_list(void)
 			break;
 		case MSR_IA32_RTIT_CTL:
 		case MSR_IA32_RTIT_STATUS:
-			if (!kvm_x86_ops->pt_supported())
+			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT))
 				continue;
 			break;
 		case MSR_IA32_RTIT_CR3_MATCH:
-			if (!kvm_x86_ops->pt_supported() ||
+			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
 			    !intel_pt_validate_hw_cap(PT_CAP_cr3_filtering))
 				continue;
 			break;
 		case MSR_IA32_RTIT_OUTPUT_BASE:
 		case MSR_IA32_RTIT_OUTPUT_MASK:
-			if (!kvm_x86_ops->pt_supported() ||
+			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
 				(!intel_pt_validate_hw_cap(PT_CAP_topa_output) &&
 				 !intel_pt_validate_hw_cap(PT_CAP_single_range_output)))
 				continue;
 			break;
 		case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B: {
-			if (!kvm_x86_ops->pt_supported() ||
+			if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT) ||
 				msrs_to_save_all[i] - MSR_IA32_RTIT_ADDR0_A >=
 				intel_pt_validate_hw_cap(PT_CAP_num_address_ranges) * 2)
 				continue;