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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 60652C43381 for ; Wed, 27 Feb 2019 10:21:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 349E020661 for ; Wed, 27 Feb 2019 10:21:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729032AbfB0KVn (ORCPT ); Wed, 27 Feb 2019 05:21:43 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:53408 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726230AbfB0KVl (ORCPT ); Wed, 27 Feb 2019 05:21:41 -0500 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x1RAFFfU139257 for ; Wed, 27 Feb 2019 05:21:40 -0500 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2qwpk3eq52-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 27 Feb 2019 05:21:40 -0500 Received: from localhost by e06smtp01.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, 27 Feb 2019 10:21:34 -0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x1RALX4Q59113502 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 27 Feb 2019 10:21:33 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 05918A4055; Wed, 27 Feb 2019 10:21:33 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5C853A4053; Wed, 27 Feb 2019 10:21:32 +0000 (GMT) Received: from [9.152.224.140] (unknown [9.152.224.140]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 27 Feb 2019 10:21:32 +0000 (GMT) Reply-To: pmorel@linux.ibm.com Subject: Re: [PATCH v4 3/7] s390: ap: associate a ap_vfio_queue and a matrix mdev To: Cornelia Huck Cc: borntraeger@de.ibm.com, alex.williamson@redhat.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, frankja@linux.ibm.com, akrowiak@linux.ibm.com, pasic@linux.ibm.com, david@redhat.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, freude@linux.ibm.com, mimu@linux.ibm.com References: <1550849400-27152-1-git-send-email-pmorel@linux.ibm.com> <1550849400-27152-4-git-send-email-pmorel@linux.ibm.com> <20190227103211.5e4d63b2.cohuck@redhat.com> From: Pierre Morel Date: Wed, 27 Feb 2019 11:21:32 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 MIME-Version: 1.0 In-Reply-To: <20190227103211.5e4d63b2.cohuck@redhat.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 x-cbid: 19022710-4275-0000-0000-000003148F10 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19022710-4276-0000-0000-00003822D175 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-02-27_06:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=2 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=971 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1902270069 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27/02/2019 10:32, Cornelia Huck wrote: > On Fri, 22 Feb 2019 16:29:56 +0100 > Pierre Morel wrote: > >> We need to associate the ap_vfio_queue, which will hold the >> per queue information for interrupt with a matrix mediated device >> which hold the configuration and the way to the CRYCB. >> >> Let's do this when assigning a APID or a APQI to the mediated device >> and clear the relation when unassigning. >> >> Queuing the devices on a list of free devices and testing the >> matrix_mdev pointer to the associated matrix allow us to know >> if the queue is associated to the matrix device and associated >> or not to a mediated device. >> >> When resetting an AP queue we must wait until there are no more >> messages in the message queue before considering the queue is really >> in a clean state. >> >> Let's do it and wait until the status response code indicate the >> queue is empty after issuing a PAPQ/ZAPQ instruction. > > I'm a bit confused about the context where that list moving etc. is > supposed to take place. > > When are we assigning/deassigning? Is there even supposed to be any > activity that we need to zap on the queues? > > Do we need any serialization/locking on the lists? Did I really forget this!? Yes, thanks. Regards, Pierre -- Pierre Morel Linux/KVM/QEMU in Böblingen - Germany