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 E484EC43381 for ; Fri, 1 Mar 2019 07:51:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id AADD5218AE for ; Fri, 1 Mar 2019 07:51:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732950AbfCAHvu (ORCPT ); Fri, 1 Mar 2019 02:51:50 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:60042 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727755AbfCAHvu (ORCPT ); Fri, 1 Mar 2019 02:51:50 -0500 Received: from pps.filterd (m0098393.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x217mrrK004339 for ; Fri, 1 Mar 2019 02:51:49 -0500 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2qxwxdejb3-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 01 Mar 2019 02:51:48 -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) Fri, 1 Mar 2019 07:51:44 -0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x217pgA931260896 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 1 Mar 2019 07:51:42 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A9EC811C050; Fri, 1 Mar 2019 07:51:42 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1498711C04A; Fri, 1 Mar 2019 07:51:42 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.49]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 1 Mar 2019 07:51:42 +0000 (GMT) Subject: Re: [PATCH v4 4/7] vfio: ap: register IOMMU VFIO notifier To: Halil Pasic , Pierre Morel Cc: alex.williamson@redhat.com, cohuck@redhat.com, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, kvm@vger.kernel.org, frankja@linux.ibm.com, akrowiak@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> <1550849400-27152-5-git-send-email-pmorel@linux.ibm.com> <20190228175513.06504ae6@oc2783563651> 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: <20190228175513.06504ae6@oc2783563651> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 19030107-4275-0000-0000-0000031573AC X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19030107-4276-0000-0000-00003823BD00 Message-Id: <15ba86ee-5b1e-c650-b8ce-307e96443be4@de.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-03-01_06:,, 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=745 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1903010055 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 28.02.2019 17:55, Halil Pasic wrote: > On Thu, 28 Feb 2019 09:48:39 +0100 > Pierre Morel wrote: > >> On 28/02/2019 09:23, Christian Borntraeger wrote: >>> On 22.02.2019 16:29, Pierre Morel wrote: >>>> To be able to use the VFIO interface to facilitate the >>>> mediated device memory pining/unpining we need to register >>>> a notifier for IOMMU. >>> >>> You might want to add that while we start to pin one guest page for the >>> interrupt indicator byte in the next patch, this is still ok with ballooning >>> as this page will never be used by the guest virtio-balloon driver. So the >>> pinned page will never be freed. And even a broken guest does so, that would >>> not impact the host as the original page is still in control by vfio. >>> >> >> Thanks, I ll do. >> > > I recall a comment in qemu that says vfio-ap does not pin any pages. > That one needs to be fixed up as well. Yes, something along the line that we do pin the interrupt indicator pages but those do not change regularly and we stay in lockstep with the guest. At the same time the guest driver will keep that page allocate so virtio-balloon will not take them.