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_HELO_NONE,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 33BB3C46477 for ; Thu, 13 Jun 2019 16:31:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0CAC321744 for ; Thu, 13 Jun 2019 16:31:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2392474AbfFMQbD (ORCPT ); Thu, 13 Jun 2019 12:31:03 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:53342 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1730894AbfFMI3l (ORCPT ); Thu, 13 Jun 2019 04:29:41 -0400 Received: from pps.filterd (m0098414.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x5D8NdRW040034 for ; Thu, 13 Jun 2019 04:29:40 -0400 Received: from e06smtp03.uk.ibm.com (e06smtp03.uk.ibm.com [195.75.94.99]) by mx0b-001b2d01.pphosted.com with ESMTP id 2t3hepc2d3-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 13 Jun 2019 04:29:40 -0400 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) Thu, 13 Jun 2019 09:29:35 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x5D8TQxF30671314 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 13 Jun 2019 08:29:26 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6972EA404D; Thu, 13 Jun 2019 08:29:33 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id B5FFBA4059; Thu, 13 Jun 2019 08:29:32 +0000 (GMT) Received: from [9.152.97.224] (unknown [9.152.97.224]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 13 Jun 2019 08:29:32 +0000 (GMT) Reply-To: mimu@linux.ibm.com Subject: Re: [PATCH v5 6/8] virtio/s390: add indirection to indicators access To: Halil Pasic , kvm@vger.kernel.org, linux-s390@vger.kernel.org, Cornelia Huck , Sebastian Ott , Heiko Carstens Cc: virtualization@lists.linux-foundation.org, "Michael S. Tsirkin" , Christoph Hellwig , Thomas Huth , Christian Borntraeger , Viktor Mihajlovski , Vasily Gorbik , Janosch Frank , Claudio Imbrenda , Farhan Ali , Eric Farman , "Jason J. Herne" References: <20190612111236.99538-1-pasic@linux.ibm.com> <20190612111236.99538-7-pasic@linux.ibm.com> From: Michael Mueller Organization: IBM Date: Thu, 13 Jun 2019 10:29:32 +0200 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190612111236.99538-7-pasic@linux.ibm.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19061308-0012-0000-0000-00000328BEE9 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19061308-0013-0000-0000-00002161C9D2 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-06-13_05:,, 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-1906130067 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On 12.06.19 13:12, Halil Pasic wrote: > This will come in handy soon when we pull out the indicators from > virtio_ccw_device to a memory area that is shared with the hypervisor > (in particular for protected virtualization guests). > > Signed-off-by: Halil Pasic > Reviewed-by: Pierre Morel > Reviewed-by: Cornelia Huck > --- > drivers/s390/virtio/virtio_ccw.c | 40 ++++++++++++++++++++------------ > 1 file changed, 25 insertions(+), 15 deletions(-) > > diff --git a/drivers/s390/virtio/virtio_ccw.c b/drivers/s390/virtio/virtio_ccw.c > index 1da7430f94c8..e96a8cc56ec2 100644 > --- a/drivers/s390/virtio/virtio_ccw.c > +++ b/drivers/s390/virtio/virtio_ccw.c > @@ -68,6 +68,16 @@ struct virtio_ccw_device { > void *airq_info; > }; > > +static inline unsigned long *indicators(struct virtio_ccw_device *vcdev) > +{ > + return &vcdev->indicators; > +} > + > +static inline unsigned long *indicators2(struct virtio_ccw_device *vcdev) > +{ > + return &vcdev->indicators2; > +} > + > struct vq_info_block_legacy { > __u64 queue; > __u32 align; > @@ -338,17 +348,17 @@ static void virtio_ccw_drop_indicator(struct virtio_ccw_device *vcdev, > ccw->cda = (__u32)(unsigned long) thinint_area; > } else { > /* payload is the address of the indicators */ > - indicatorp = kmalloc(sizeof(&vcdev->indicators), > + indicatorp = kmalloc(sizeof(indicators(vcdev)), > GFP_DMA | GFP_KERNEL); > if (!indicatorp) > return; > *indicatorp = 0; > ccw->cmd_code = CCW_CMD_SET_IND; > - ccw->count = sizeof(&vcdev->indicators); > + ccw->count = sizeof(indicators(vcdev)); > ccw->cda = (__u32)(unsigned long) indicatorp; > } > /* Deregister indicators from host. */ > - vcdev->indicators = 0; > + *indicators(vcdev) = 0; > ccw->flags = 0; > ret = ccw_io_helper(vcdev, ccw, > vcdev->is_thinint ? > @@ -657,10 +667,10 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, > * We need a data area under 2G to communicate. Our payload is > * the address of the indicators. > */ > - indicatorp = kmalloc(sizeof(&vcdev->indicators), GFP_DMA | GFP_KERNEL); > + indicatorp = kmalloc(sizeof(indicators(vcdev)), GFP_DMA | GFP_KERNEL); > if (!indicatorp) > goto out; > - *indicatorp = (unsigned long) &vcdev->indicators; > + *indicatorp = (unsigned long) indicators(vcdev); > if (vcdev->is_thinint) { > ret = virtio_ccw_register_adapter_ind(vcdev, vqs, nvqs, ccw); > if (ret) > @@ -669,21 +679,21 @@ static int virtio_ccw_find_vqs(struct virtio_device *vdev, unsigned nvqs, > } > if (!vcdev->is_thinint) { > /* Register queue indicators with host. */ > - vcdev->indicators = 0; > + *indicators(vcdev) = 0; > ccw->cmd_code = CCW_CMD_SET_IND; > ccw->flags = 0; > - ccw->count = sizeof(&vcdev->indicators); > + ccw->count = sizeof(indicators(vcdev)); > ccw->cda = (__u32)(unsigned long) indicatorp; > ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_IND); > if (ret) > goto out; > } > /* Register indicators2 with host for config changes */ > - *indicatorp = (unsigned long) &vcdev->indicators2; > - vcdev->indicators2 = 0; > + *indicatorp = (unsigned long) indicators2(vcdev); > + *indicators2(vcdev) = 0; > ccw->cmd_code = CCW_CMD_SET_CONF_IND; > ccw->flags = 0; > - ccw->count = sizeof(&vcdev->indicators2); > + ccw->count = sizeof(indicators2(vcdev)); > ccw->cda = (__u32)(unsigned long) indicatorp; > ret = ccw_io_helper(vcdev, ccw, VIRTIO_CCW_DOING_SET_CONF_IND); > if (ret) > @@ -1093,17 +1103,17 @@ static void virtio_ccw_int_handler(struct ccw_device *cdev, > vcdev->err = -EIO; > } > virtio_ccw_check_activity(vcdev, activity); > - for_each_set_bit(i, &vcdev->indicators, > - sizeof(vcdev->indicators) * BITS_PER_BYTE) { > + for_each_set_bit(i, indicators(vcdev), > + sizeof(*indicators(vcdev)) * BITS_PER_BYTE) { > /* The bit clear must happen before the vring kick. */ > - clear_bit(i, &vcdev->indicators); > + clear_bit(i, indicators(vcdev)); > barrier(); > vq = virtio_ccw_vq_by_ind(vcdev, i); > vring_interrupt(0, vq); > } > - if (test_bit(0, &vcdev->indicators2)) { > + if (test_bit(0, indicators2(vcdev))) { > virtio_config_changed(&vcdev->vdev); > - clear_bit(0, &vcdev->indicators2); > + clear_bit(0, indicators2(vcdev)); > } > } > > Reviewed-by: Michael Mueller Michael