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=-0.9 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 8DCF8C65BAF for ; Wed, 12 Dec 2018 16:37:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5420720672 for ; Wed, 12 Dec 2018 16:37:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5420720672 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 S1727948AbeLLQhp (ORCPT ); Wed, 12 Dec 2018 11:37:45 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:44518 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726922AbeLLQho (ORCPT ); Wed, 12 Dec 2018 11:37:44 -0500 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 wBCGSjw3018990 for ; Wed, 12 Dec 2018 11:37:43 -0500 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 2pb3mhg0hn-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 12 Dec 2018 11:37:43 -0500 Received: from localhost by e06smtp03.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, 12 Dec 2018 16:37:37 -0000 Received: from d06av24.portsmouth.uk.ibm.com (d06av24.portsmouth.uk.ibm.com [9.149.105.60]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id wBCGbaCb52363326 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 12 Dec 2018 16:37:36 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id F13E442045; Wed, 12 Dec 2018 16:37:35 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 828AA42047; Wed, 12 Dec 2018 16:37:35 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.145.34.149]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 12 Dec 2018 16:37:35 +0000 (GMT) Subject: Re: [PATCH 15/52] fuse: map virtio_fs DAX window BAR To: Vivek Goyal , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: miklos@szeredi.hu, stefanha@redhat.com, dgilbert@redhat.com, sweil@redhat.com, swhiteho@redhat.com, Cornelia Huck , Halil Pasic References: <20181210171318.16998-1-vgoyal@redhat.com> <20181210171318.16998-16-vgoyal@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: <20181210171318.16998-16-vgoyal@redhat.com> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18121216-0012-0000-0000-000002D81C93 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18121216-0013-0000-0000-0000210D9865 Message-Id: <0d127f4f-5ea6-0453-037a-6417cc8471ab@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=2018-12-12_04:,, 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=8.0.1-1810050000 definitions=main-1812120142 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10.12.2018 18:12, Vivek Goyal wrote: > From: Stefan Hajnoczi > +static int virtio_fs_setup_dax(struct virtio_device *vdev, struct virtio_fs *fs) > +{ > + struct virtio_fs_memremap_info *mi; > + struct dev_pagemap *pgmap; > + struct pci_dev *pci_dev; > + phys_addr_t phys_addr; > + size_t len; > + int ret; > + > + if (!IS_ENABLED(CONFIG_DAX_DRIVER)) > + return 0; > + > + /* HACK implement VIRTIO shared memory regions instead of > + * directly accessing the PCI BAR from a virtio device driver. > + */ > + pci_dev = container_of(vdev->dev.parent, struct pci_dev, dev); > + > + /* TODO Is this safe - the virtio_pci_* driver doesn't use managed > + * device APIs? */ > + ret = pcim_enable_device(pci_dev); > + if (ret < 0) > + return ret; > + > + /* TODO handle case where device doesn't expose BAR? */ > + ret = pci_request_region(pci_dev, VIRTIO_FS_WINDOW_BAR, > + "virtio-fs-window"); > + if (ret < 0) { > + dev_err(&vdev->dev, "%s: failed to request window BAR\n", > + __func__); > + return ret; > + } Can we please have a generic virtio interface to map the address (the default can then fall back to PCI) instead of mapping a PCI bar? This would make it easier to implement virtio-ccw or virtio-mmio.