nt */
 	if (mm_is_protected(mm) && pte_present(res))
-		uv_convert_from_secure_pte(res);
+		WARN_ON_ONCE(uv_convert_from_secure_pte(res));
 	return res;
 }
 
@@ -1257,7 +1257,7 @@ static inline pte_t ptep_clear_flush(struct vm_area_struct *vma,
 	res = ptep_xchg_direct(vma->vm_mm, addr, ptep, __pte(_PAGE_INVALID));
 	/* At this point the reference through the mapping is still present */
 	if (mm_is_protected(vma->vm_mm) && pte_present(res))
-		uv_convert_from_secure_pte(res);
+		WARN_ON_ONCE(uv_convert_from_secure_pte(res));
 	return res;
 }
 
@@ -1294,9 +1294,10 @@ static inline pte_t ptep_get_and_clear_full(struct mm_struct *mm,
 	/*
 	 * If something went wrong and the page could not be destroyed, or
 	 * if this is not a mm teardown, the slower export is used as
-	 * fallback instead.
+	 * fallback instead. If even that fails, print a warning and leak
+	 * the page, to avoid crashing the whole system.
 	 */
-	uv_convert_from_secure_pte(res);
+	WARN_ON_ONCE(uv_convert_from_secure_pte(res));
 	return res;
 }
 
-- 
2.52.0[PATCH v6 08/28] s390/mm: Warn if uv_convert_from_secure_pte() failsClaudio Imbrenda <imbrenda@linux.ibm.com> undefinedkvm@vger.kernel.org undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefined undefinedőC„×