diff --git a/tools/testing/selftests/kvm/include/x86/processor.h b/tools/testing/selftests/kvm/include/x86/processor.h
index 6e6f70035508..3d3a7d9f2a95 100644
--- a/tools/testing/selftests/kvm/include/x86/processor.h
+++ b/tools/testing/selftests/kvm/include/x86/processor.h
@@ -1472,6 +1472,19 @@ static inline bool kvm_is_lbrv_enabled(void)
 	return !!get_kvm_amd_param_integer("lbrv");
 }
 
+/*
+ * Do NOT use this to check for nVMX or nSVM support.  Querying kvm_cpu_has()
+ * for either of X86_FEATURE_{VMX,SVM} is the idiomatic way to check for nested
+ * virtualization support.  Use this *only* to validate KVM's own enumeration.
+ */
+static inline bool kvm_is_nested_virtualization_enabled(void)
+{
+	if (host_cpu_is_intel)
+		return get_kvm_intel_param_bool("nested");
+
+	return get_kvm_amd_param_integer("nested");
+}
+
 u64 *vm_get_pte(struct kvm_vm *vm, gva_t gva);
 
 u64 kvm_hypercall(u64 nr, u64 a0, u64 a1, u64 a2, u64 a3);