From patchwork Wed Sep 12 19:42:58 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Tony Krowiak X-Patchwork-Id: 10598257 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 7AC9615E2 for ; Wed, 12 Sep 2018 19:46:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 689392AA99 for ; Wed, 12 Sep 2018 19:46:34 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 5A41C2AAA4; Wed, 12 Sep 2018 19:46:34 +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 B791B2AA99 for ; Wed, 12 Sep 2018 19:46:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728369AbeIMAuH (ORCPT ); Wed, 12 Sep 2018 20:50:07 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:56394 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728363AbeIMAuH (ORCPT ); Wed, 12 Sep 2018 20:50:07 -0400 Received: from pps.filterd (m0098413.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.22/8.16.0.22) with SMTP id w8CJY33t057966 for ; Wed, 12 Sep 2018 15:44:03 -0400 Received: from e34.co.us.ibm.com (e34.co.us.ibm.com [32.97.110.152]) by mx0b-001b2d01.pphosted.com with ESMTP id 2mf68jfen6-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 12 Sep 2018 15:44:03 -0400 Received: from localhost by e34.co.us.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 Sep 2018 13:44:00 -0600 Received: from b03ledav003.gho.boulder.ibm.com (b03ledav003.gho.boulder.ibm.com [9.17.130.234]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w8CJhup832047196 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Wed, 12 Sep 2018 12:43:56 -0700 Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C75A46A057; Wed, 12 Sep 2018 13:43:56 -0600 (MDT) Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0CF466A047; Wed, 12 Sep 2018 13:43:54 -0600 (MDT) Received: from localhost.localdomain (unknown [9.80.213.181]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTPS; Wed, 12 Sep 2018 13:43:53 -0600 (MDT) From: Tony Krowiak To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: freude@de.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com, kwankhede@nvidia.com, bjsdjshi@linux.vnet.ibm.com, pbonzini@redhat.com, alex.williamson@redhat.com, pmorel@linux.vnet.ibm.com, alifm@linux.vnet.ibm.com, mjrosato@linux.vnet.ibm.com, jjherne@linux.vnet.ibm.com, thuth@redhat.com, pasic@linux.vnet.ibm.com, berrange@redhat.com, fiuczy@linux.vnet.ibm.com, buendgen@de.ibm.com, akrowiak@linux.vnet.ibm.com, frankja@linux.ibm.com, Tony Krowiak Subject: [PATCH v10 08/26] s390: vfio-ap: sysfs interfaces to configure control domains Date: Wed, 12 Sep 2018 15:42:58 -0400 X-Mailer: git-send-email 1.7.1 In-Reply-To: <1536781396-13601-1-git-send-email-akrowiak@linux.vnet.ibm.com> References: <1536781396-13601-1-git-send-email-akrowiak@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18091219-0016-0000-0000-0000092C78D9 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009709; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01087371; UDB=6.00561489; IPR=6.00867383; MB=3.00023256; MTD=3.00000008; XFM=3.00000015; UTC=2018-09-12 19:44:02 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18091219-0017-0000-0000-000040546981 Message-Id: <1536781396-13601-9-git-send-email-akrowiak@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-09-12_10:,, 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=8.0.1-1807170000 definitions=main-1809120195 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP From: Tony Krowiak Provides the sysfs interfaces for: 1. Assigning AP control domains to the mediated matrix device 2. Unassigning AP control domains from a mediated matrix device 3. Displaying the control domains assigned to a mediated matrix device The IDs of the AP control domains assigned to the mediated matrix device are stored in an AP domain mask (ADM). The bits in the ADM, from most significant to least significant bit, correspond to AP domain numbers 0 to 255. On some systems, the maximum allowable domain number may be less than 255 - depending upon the host's AP configuration - and assignment may be rejected if the input domain ID exceeds the limit. When a control domain is assigned, the bit corresponding its domain ID will be set in the ADM. Likewise, when a domain is unassigned, the bit corresponding to its domain ID will be cleared in the ADM. The relevant sysfs structures are: /sys/devices/vfio_ap/matrix/ ...... [mdev_supported_types] ......... [vfio_ap-passthrough] ............ [devices] ...............[$uuid] .................. assign_control_domain .................. unassign_control_domain To assign a control domain to the $uuid mediated matrix device's ADM, write its domain number to the assign_control_domain file. To unassign a domain, write its domain number to the unassign_control_domain file. The domain number is specified using conventional semantics: If it begins with 0x the number will be parsed as a hexadecimal (case insensitive) number; if it begins with 0, it is parsed as an octal number; otherwise, it will be parsed as a decimal number. For example, to assign control domain 173 (0xad) to the mediated matrix device $uuid: echo 173 > assign_control_domain or echo 0255 > assign_control_domain or echo 0xad > assign_control_domain To unassign control domain 173 (0xad): echo 173 > unassign_control_domain or echo 0255 > unassign_control_domain or echo 0xad > unassign_control_domain The assignment will be rejected if the APQI exceeds the maximum value for an AP domain: * If the AP Extended Addressing (APXA) facility is installed, the max value is 255 * Else the max value is 15 Signed-off-by: Tony Krowiak Reviewed-by: Halil Pasic Tested-by: Michael Mueller Tested-by: Farhan Ali Tested-by: Pierre Morel Signed-off-by: Christian Borntraeger Reviewed-by: Cornelia Huck --- drivers/s390/crypto/vfio_ap_ops.c | 112 +++++++++++++++++++++++++++++++++++++ 1 files changed, 112 insertions(+), 0 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index a687624..179b093 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -519,11 +519,123 @@ static ssize_t unassign_domain_store(struct device *dev, } DEVICE_ATTR_WO(unassign_domain); +/** + * assign_control_domain_store + * + * @dev: the matrix device + * @attr: the mediated matrix device's assign_control_domain attribute + * @buf: a buffer containing the domain ID to be assigned + * @count: the number of bytes in @buf + * + * Parses the domain ID from @buf and sets the corresponding bit in the mediated + * matrix device's ADM. + * + * Returns the number of bytes processed if the domain ID is valid; otherwise, + * returns one of the following errors: + * -EINVAL if the ID is not a number + * -ENODEV if the ID exceeds the maximum value configured for the system + */ +static ssize_t assign_control_domain_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + unsigned long id; + struct mdev_device *mdev = mdev_from_dev(dev); + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); + + ret = kstrtoul(buf, 0, &id); + if (ret) + return ret; + + if (id > matrix_mdev->matrix.adm_max) + return -ENODEV; + + /* Set the bit in the ADM (bitmask) corresponding to the AP control + * domain number (id). The bits in the mask, from most significant to + * least significant, correspond to IDs 0 up to the one less than the + * number of control domains that can be assigned. + */ + mutex_lock(&matrix_dev->lock); + set_bit_inv(id, matrix_mdev->matrix.adm); + mutex_unlock(&matrix_dev->lock); + + return count; +} +DEVICE_ATTR_WO(assign_control_domain); + +/** + * unassign_control_domain_store + * + * @dev: the matrix device + * @attr: the mediated matrix device's unassign_control_domain attribute + * @buf: a buffer containing the domain ID to be unassigned + * @count: the number of bytes in @buf + * + * Parses the domain ID from @buf and clears the corresponding bit in the + * mediated matrix device's ADM. + * + * Returns the number of bytes processed if the domain ID is valid; otherwise, + * returns one of the following errors: + * -EINVAL if the ID is not a number + * -ENODEV if the ID exceeds the maximum value configured for the system + */ +static ssize_t unassign_control_domain_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + unsigned long domid; + struct mdev_device *mdev = mdev_from_dev(dev); + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); + unsigned long max_domid = matrix_mdev->matrix.adm_max; + + ret = kstrtoul(buf, 0, &domid); + if (ret) + return ret; + if (domid > max_domid) + return -ENODEV; + + mutex_lock(&matrix_dev->lock); + clear_bit_inv(domid, matrix_mdev->matrix.adm); + mutex_unlock(&matrix_dev->lock); + + return count; +} +DEVICE_ATTR_WO(unassign_control_domain); + +static ssize_t control_domains_show(struct device *dev, + struct device_attribute *dev_attr, + char *buf) +{ + unsigned long id; + int nchars = 0; + int n; + char *bufpos = buf; + struct mdev_device *mdev = mdev_from_dev(dev); + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); + unsigned long max_domid = matrix_mdev->matrix.adm_max; + + mutex_lock(&matrix_dev->lock); + for_each_set_bit_inv(id, matrix_mdev->matrix.adm, max_domid + 1) { + n = sprintf(bufpos, "%04lx\n", id); + bufpos += n; + nchars += n; + } + mutex_unlock(&matrix_dev->lock); + + return nchars; +} +DEVICE_ATTR_RO(control_domains); + static struct attribute *vfio_ap_mdev_attrs[] = { &dev_attr_assign_adapter.attr, &dev_attr_unassign_adapter.attr, &dev_attr_assign_domain.attr, &dev_attr_unassign_domain.attr, + &dev_attr_assign_control_domain.attr, + &dev_attr_unassign_control_domain.attr, + &dev_attr_control_domains.attr, NULL, };