From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D9DB6C43382 for ; Wed, 26 Sep 2018 19:01:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 90FDB2150C for ; Wed, 26 Sep 2018 19:01:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 90FDB2150C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=de.ibm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728746AbeI0BPe (ORCPT ); Wed, 26 Sep 2018 21:15:34 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:58986 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726453AbeI0BPe (ORCPT ); Wed, 26 Sep 2018 21:15:34 -0400 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w8QJ13O4109647 for ; Wed, 26 Sep 2018 15:01:12 -0400 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0a-001b2d01.pphosted.com with ESMTP id 2mrdeky9d3-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 26 Sep 2018 15:01:09 -0400 Received: from localhost by e06smtp02.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Wed, 26 Sep 2018 19:58:45 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w8QIwhe747513692 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 26 Sep 2018 18:58:43 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id BCA14A4057; Wed, 26 Sep 2018 21:58:24 +0100 (BST) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8CDBFA4040; Wed, 26 Sep 2018 21:58:22 +0100 (BST) Received: from oc7455500831.ibm.com (unknown [9.145.160.197]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 26 Sep 2018 21:58:22 +0100 (BST) Subject: Re: [PATCH v11 13/26] s390: vfio-ap: zeroize the AP queues To: Cornelia Huck , Tony Krowiak Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com, alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com, thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com, frankja@linux.ibm.com, Tony Krowiak References: <20180925231641.4954-1-akrowiak@linux.vnet.ibm.com> <20180925231641.4954-14-akrowiak@linux.vnet.ibm.com> <20180926153831.195af1ce.cohuck@redhat.com> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180926153831.195af1ce.cohuck@redhat.com> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18092618-0008-0000-0000-000002776C68 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18092618-0009-0000-0000-000021E0710B Message-Id: Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-09-26_08:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1809260177 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/26/2018 03:38 PM, Cornelia Huck wrote: > On Tue, 25 Sep 2018 19:16:28 -0400 > Tony Krowiak wrote: > >> From: Tony Krowiak >> >> Let's call PAPQ(ZAPQ) to zeroize a queue for each queue configured >> for a mediated matrix device when it is released. >> >> Zeroizing a queue resets the queue, clears all pending >> messages for the queue entries and disables adapter interruptions >> associated with the queue. >> >> Signed-off-by: Tony Krowiak >> Reviewed-by: Halil Pasic >> Tested-by: Michael Mueller >> Tested-by: Farhan Ali >> --- >> drivers/s390/crypto/vfio_ap_ops.c | 44 +++++++++++++++++++++++++++++++ >> 1 file changed, 44 insertions(+) >> >> diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c >> index b4f67d547493..1943e47d7d78 100644 >> --- a/drivers/s390/crypto/vfio_ap_ops.c >> +++ b/drivers/s390/crypto/vfio_ap_ops.c >> @@ -816,6 +816,49 @@ static int vfio_ap_mdev_group_notifier(struct notifier_block *nb, >> return NOTIFY_OK; >> } >> >> +static int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi, >> + unsigned int retry) >> +{ >> + struct ap_queue_status status; >> + >> + do { >> + status = ap_zapq(AP_MKQID(apid, apqi)); >> + switch (status.response_code) { >> + case AP_RESPONSE_NORMAL: >> + return 0; >> + case AP_RESPONSE_RESET_IN_PROGRESS: >> + case AP_RESPONSE_BUSY: >> + msleep(20); >> + break; >> + default: >> + /* things are really broken, give up */ >> + return -EIO; >> + } >> + } while (retry--); >> + >> + return -EBUSY; >> +} >> + >> +static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev) >> +{ >> + int ret; >> + int rc = 0; >> + unsigned long apid, apqi; >> + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); >> + >> + for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, >> + matrix_mdev->matrix.apm_max + 1) { >> + for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, >> + matrix_mdev->matrix.aqm_max + 1) { >> + ret = vfio_ap_mdev_reset_queue(apid, apqi, 1); > > I'd still like to see a comment here: > > /* > * Regardless whether a queue turns out to be busy, or is not > * operational, we need to continue resetting the remaining > * queues. > */ I added your proposal to the apv11 branch.