From nobody Mon Apr 13 21:06:24 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4C671C25B0E for ; Wed, 10 Aug 2022 12:57:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232376AbiHJM46 (ORCPT ); Wed, 10 Aug 2022 08:56:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51450 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232346AbiHJM4h (ORCPT ); Wed, 10 Aug 2022 08:56:37 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 75E8B5C94F; Wed, 10 Aug 2022 05:56:36 -0700 (PDT) Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 27ACoU8U022104; Wed, 10 Aug 2022 12:56:36 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=H+c3OOZvQuKXwnaer4RzsqK0V/wcSRQ8/ZF6HymAva4=; b=JaWT9lv5kGc/+Luac6BHushEu5u3GOK+SJERAk/ehfR0y6ZXpR3fBtmP3cGgxhg0kMMM KEXw6KCBduxo2jnkhYMszWeD/wVKRHzZiofAK4G31GE5STz5H0v3Icyz+TyAvkzw08/1 ock2lzhzGxKFfiOv4yX5uUW+UUjnTRHOvX1gYxf/iNZkKJfIDvIcsus0FcBwQYNwy7Jb 3lRBom2EQiHTniNkkquFcZ69qtEYj/sYxNVAwF1Uo4OQE7Z3gl+QFECSGMMM0dlGLwts AokR2Z+S3r6CWdflP99ssr/c0cIj9bNtARbf5VcDbvHyMylcl8EdQW2dvEbZqjMaczE6 dA== Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3hv31vswgd-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Aug 2022 12:56:36 +0000 Received: from m0098409.ppops.net (m0098409.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 27ACuZuD016636; Wed, 10 Aug 2022 12:56:35 GMT Received: from ppma02fra.de.ibm.com (47.49.7a9f.ip4.static.sl-reverse.com [159.122.73.71]) by mx0a-001b2d01.pphosted.com (PPS) with ESMTPS id 3hv31vswfc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Aug 2022 12:56:35 +0000 Received: from pps.filterd (ppma02fra.de.ibm.com [127.0.0.1]) by ppma02fra.de.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 27ACuSp1012812; Wed, 10 Aug 2022 12:56:33 GMT Received: from b06cxnps3075.portsmouth.uk.ibm.com (d06relay10.portsmouth.uk.ibm.com [9.149.109.195]) by ppma02fra.de.ibm.com with ESMTP id 3huww0ru72-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 10 Aug 2022 12:56:32 +0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 27ACuTIZ23527910 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 10 Aug 2022 12:56:29 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A818F4C046; Wed, 10 Aug 2022 12:56:29 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0345F4C040; Wed, 10 Aug 2022 12:56:29 +0000 (GMT) Received: from p-imbrenda.bredband2.com (unknown [9.145.0.105]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 10 Aug 2022 12:56:28 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: borntraeger@de.ibm.com, frankja@linux.ibm.com, thuth@redhat.com, pasic@linux.ibm.com, david@redhat.com, linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, scgl@linux.ibm.com, seiden@linux.ibm.com, nrb@linux.ibm.com Subject: [PATCH v13 4/6] KVM: s390: pv: avoid export before import if possible Date: Wed, 10 Aug 2022 14:56:23 +0200 Message-Id: <20220810125625.45295-5-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20220810125625.45295-1-imbrenda@linux.ibm.com> References: <20220810125625.45295-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: PIgJ43YdXg8ZDTZOTVlhMQYQWwdN3ST_ X-Proofpoint-ORIG-GUID: keNZ0Mi_ORXwctl6o1OJ3MTSMwin1gxl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.883,Hydra:6.0.517,FMLib:17.11.122.1 definitions=2022-08-10_07,2022-08-10_01,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 impostorscore=0 spamscore=0 adultscore=0 mlxscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 suspectscore=0 malwarescore=0 priorityscore=1501 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2207270000 definitions=main-2208100038 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" If the appropriate UV feature bit is set, there is no need to perform an export before import. Signed-off-by: Claudio Imbrenda Reviewed-by: Nico Boehr Reviewed-by: Janosch Frank --- arch/s390/kernel/uv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/s390/kernel/uv.c b/arch/s390/kernel/uv.c index f9810d2a267c..b455646c8d74 100644 --- a/arch/s390/kernel/uv.c +++ b/arch/s390/kernel/uv.c @@ -255,6 +255,8 @@ static int make_secure_pte(pte_t *ptep, unsigned long a= ddr, */ static bool should_export_before_import(struct uv_cb_header *uvcb, struct = mm_struct *mm) { + if (test_bit_inv(BIT_UV_FEAT_MISC, &uv_info.uv_feature_indications)) + return false; if (uvcb->cmd =3D=3D UVC_CMD_UNPIN_PAGE_SHARED) return false; return atomic_read(&mm->context.protected_count) > 1; --=20 2.37.1