KVM: x86: Use kvm_cpu_caps to detect Intel PT support

Check for Intel PT using kvm_cpu_cap_has() to pave the way toward
eliminating ->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/cpuid.c

@@ -504,7 +504,6 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 {
 	struct kvm_cpuid_entry2 *entry;
 	int r, i, max_idx;
-	unsigned f_intel_pt = kvm_x86_ops->pt_supported() ? F(INTEL_PT) : 0;
 
 	/* all calls to cpuid_count() should be made on the same cpu */
 	get_cpu();
@@ -675,7 +674,7 @@ static inline int __do_cpuid_func(struct kvm_cpuid_array *array, u32 function)
 		break;
 	/* Intel PT */
 	case 0x14:
-		if (!f_intel_pt) {
+		if (!kvm_cpu_cap_has(X86_FEATURE_INTEL_PT)) {
 			entry->eax = entry->ebx = entry->ecx = entry->edx = 0;
 			break;
 		}