From patchwork Fri Apr 26 18:32:43 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Halil Pasic X-Patchwork-Id: 10919577 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 17CA8933 for ; Fri, 26 Apr 2019 18:33:15 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0812928E5A for ; Fri, 26 Apr 2019 18:33:15 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id F08BF28E5B; Fri, 26 Apr 2019 18:33:14 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 81E1528E5D for ; Fri, 26 Apr 2019 18:33:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726419AbfDZSdK (ORCPT ); Fri, 26 Apr 2019 14:33:10 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:44190 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726404AbfDZSdJ (ORCPT ); Fri, 26 Apr 2019 14:33:09 -0400 Received: from pps.filterd (m0098396.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x3QIIfbr035871 for ; Fri, 26 Apr 2019 14:33:08 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2s467438pb-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Fri, 26 Apr 2019 14:33:08 -0400 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, 26 Apr 2019 19:33:02 +0100 Received: from d06av21.portsmouth.uk.ibm.com (d06av21.portsmouth.uk.ibm.com [9.149.105.232]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x3QIX1Rw21430458 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 26 Apr 2019 18:33:01 GMT Received: from d06av21.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E68345204E; Fri, 26 Apr 2019 18:33:00 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.152.85.9]) by d06av21.portsmouth.uk.ibm.com (Postfix) with ESMTPS id 5076A52057; Fri, 26 Apr 2019 18:33:00 +0000 (GMT) From: Halil Pasic To: kvm@vger.kernel.org, linux-s390@vger.kernel.org, Cornelia Huck , Martin Schwidefsky , Sebastian Ott Cc: Halil Pasic , 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 Subject: [PATCH 08/10] virtio/s390: add indirection to indicators access Date: Fri, 26 Apr 2019 20:32:43 +0200 X-Mailer: git-send-email 2.16.4 In-Reply-To: <20190426183245.37939-1-pasic@linux.ibm.com> References: <20190426183245.37939-1-pasic@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19042618-4275-0000-0000-0000032EAAB0 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19042618-4276-0000-0000-0000383DFC1A Message-Id: <20190426183245.37939-9-pasic@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-04-26_12:,, 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=877 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1904260124 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP 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 --- 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 bb7a92316fc8..1f3e7d56924f 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; @@ -337,17 +347,17 @@ 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 ? @@ -656,10 +666,10 @@ 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) @@ -668,21 +678,21 @@ 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) @@ -1092,17 +1102,17 @@ 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)); } }