From patchwork Fri Jun 5 21:39:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anthony Krowiak X-Patchwork-Id: 11590623 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7C2AE17C9 for ; Fri, 5 Jun 2020 21:41:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B804207D5 for ; Fri, 5 Jun 2020 21:41:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728013AbgFEVkm (ORCPT ); Fri, 5 Jun 2020 17:40:42 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:44450 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728888AbgFEVkX (ORCPT ); Fri, 5 Jun 2020 17:40:23 -0400 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 055LWbhY195697; Fri, 5 Jun 2020 17:40:18 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com with ESMTP id 31fhra7fjr-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 05 Jun 2020 17:40:17 -0400 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 055LeHgm024966; Fri, 5 Jun 2020 17:40:17 -0400 Received: from ppma03dal.us.ibm.com (b.bd.3ea9.ip4.static.sl-reverse.com [169.62.189.11]) by mx0b-001b2d01.pphosted.com with ESMTP id 31fhra7fjf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 05 Jun 2020 17:40:17 -0400 Received: from pps.filterd (ppma03dal.us.ibm.com [127.0.0.1]) by ppma03dal.us.ibm.com (8.16.0.42/8.16.0.42) with SMTP id 055LYuvd016975; Fri, 5 Jun 2020 21:40:16 GMT Received: from b01cxnp22034.gho.pok.ibm.com (b01cxnp22034.gho.pok.ibm.com [9.57.198.24]) by ppma03dal.us.ibm.com with ESMTP id 31bf4b2mce-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 05 Jun 2020 21:40:16 +0000 Received: from b01ledav006.gho.pok.ibm.com (b01ledav006.gho.pok.ibm.com [9.57.199.111]) by b01cxnp22034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 055LeEok43843990 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 5 Jun 2020 21:40:14 GMT Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8023EAC05F; Fri, 5 Jun 2020 21:40:14 +0000 (GMT) Received: from b01ledav006.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0DB31AC060; Fri, 5 Jun 2020 21:40:14 +0000 (GMT) Received: from cpe-172-100-175-116.stny.res.rr.com.com (unknown [9.85.146.208]) by b01ledav006.gho.pok.ibm.com (Postfix) with ESMTP; Fri, 5 Jun 2020 21:40:13 +0000 (GMT) From: Tony Krowiak To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: freude@linux.ibm.com, borntraeger@de.ibm.com, cohuck@redhat.com, mjrosato@linux.ibm.com, pasic@linux.ibm.com, alex.williamson@redhat.com, kwankhede@nvidia.com, fiuczy@linux.ibm.com, Tony Krowiak Subject: [PATCH v8 10/16] s390/vfio-ap: allow assignment of unavailable AP queues to mdev device Date: Fri, 5 Jun 2020 17:39:58 -0400 Message-Id: <20200605214004.14270-11-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200605214004.14270-1-akrowiak@linux.ibm.com> References: <20200605214004.14270-1-akrowiak@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.687 definitions=2020-06-05_07:2020-06-04,2020-06-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 priorityscore=1501 mlxlogscore=999 mlxscore=0 suspectscore=3 lowpriorityscore=0 cotscore=-2147483648 impostorscore=0 spamscore=0 clxscore=1015 phishscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006050157 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The current implementation does not allow assignment of an AP adapter or domain to an mdev device if the APQNs resulting from the assignment do not reference AP queue devices that are bound to the vfio_ap device driver. This patch allows assignment of AP resources to the matrix mdev as long as the APQNs resulting from the assignment: 1. Are not reserved by the AP BUS for use by the zcrypt device drivers. 2. Are not assigned to another matrix mdev. The rationale behind this is twofold: 1. The AP architecture does not preclude assignment of APQNs to an AP configuration that are not available to the system. 2. APQNs that do not reference a queue device bound to the vfio_ap device driver will not be assigned to the guest's CRYCB, so the guest will not get access to queues not bound to the vfio_ap driver. Signed-off-by: Tony Krowiak --- drivers/s390/crypto/vfio_ap_ops.c | 212 +++++------------------------- 1 file changed, 35 insertions(+), 177 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 9a019b2b86f8..68bdf80807c6 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -1,4 +1,3 @@ -// SPDX-License-Identifier: GPL-2.0+ /* * Adjunct processor matrix VFIO device driver callbacks. * @@ -421,122 +420,6 @@ static struct attribute_group *vfio_ap_mdev_type_groups[] = { NULL, }; -struct vfio_ap_queue_reserved { - unsigned long *apid; - unsigned long *apqi; - bool reserved; -}; - -/** - * vfio_ap_has_queue - * - * @dev: an AP queue device - * @data: a struct vfio_ap_queue_reserved reference - * - * Flags whether the AP queue device (@dev) has a queue ID containing the APQN, - * apid or apqi specified in @data: - * - * - If @data contains both an apid and apqi value, then @data will be flagged - * as reserved if the APID and APQI fields for the AP queue device matches - * - * - If @data contains only an apid value, @data will be flagged as - * reserved if the APID field in the AP queue device matches - * - * - If @data contains only an apqi value, @data will be flagged as - * reserved if the APQI field in the AP queue device matches - * - * Returns 0 to indicate the input to function succeeded. Returns -EINVAL if - * @data does not contain either an apid or apqi. - */ -static int vfio_ap_has_queue(struct device *dev, void *data) -{ - struct vfio_ap_queue_reserved *qres = data; - struct ap_queue *ap_queue = to_ap_queue(dev); - ap_qid_t qid; - unsigned long id; - - if (qres->apid && qres->apqi) { - qid = AP_MKQID(*qres->apid, *qres->apqi); - if (qid == ap_queue->qid) - qres->reserved = true; - } else if (qres->apid && !qres->apqi) { - id = AP_QID_CARD(ap_queue->qid); - if (id == *qres->apid) - qres->reserved = true; - } else if (!qres->apid && qres->apqi) { - id = AP_QID_QUEUE(ap_queue->qid); - if (id == *qres->apqi) - qres->reserved = true; - } else { - return -EINVAL; - } - - return 0; -} - -/** - * vfio_ap_verify_queue_reserved - * - * @matrix_dev: a mediated matrix device - * @apid: an AP adapter ID - * @apqi: an AP queue index - * - * Verifies that the AP queue with @apid/@apqi is reserved by the VFIO AP device - * driver according to the following rules: - * - * - If both @apid and @apqi are not NULL, then there must be an AP queue - * device bound to the vfio_ap driver with the APQN identified by @apid and - * @apqi - * - * - If only @apid is not NULL, then there must be an AP queue device bound - * to the vfio_ap driver with an APQN containing @apid - * - * - If only @apqi is not NULL, then there must be an AP queue device bound - * to the vfio_ap driver with an APQN containing @apqi - * - * Returns 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL. - */ -static int vfio_ap_verify_queue_reserved(unsigned long *apid, - unsigned long *apqi) -{ - int ret; - struct vfio_ap_queue_reserved qres; - - qres.apid = apid; - qres.apqi = apqi; - qres.reserved = false; - - ret = driver_for_each_device(&matrix_dev->vfio_ap_drv->driver, NULL, - &qres, vfio_ap_has_queue); - if (ret) - return ret; - - if (qres.reserved) - return 0; - - return -EADDRNOTAVAIL; -} - -static int -vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev, - unsigned long apid) -{ - int ret; - unsigned long apqi; - unsigned long nbits = matrix_mdev->matrix.aqm_max + 1; - - if (find_first_bit_inv(matrix_mdev->matrix.aqm, nbits) >= nbits) - return vfio_ap_verify_queue_reserved(&apid, NULL); - - for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, nbits) { - ret = vfio_ap_verify_queue_reserved(&apid, &apqi); - if (ret) - return ret; - } - - return 0; -} - #define MDEV_SHARING_ERR "Userspace may not re-assign queue %02lx.%04lx " \ "already assigned to %s" @@ -573,6 +456,11 @@ static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev, DECLARE_BITMAP(aqm, AP_DOMAINS); list_for_each_entry(lstdev, &matrix_dev->mdev_list, node) { + /* + * If either of the input masks belongs to the mdev to which an + * AP resource is being assigned, then we don't need to verify + * that mdev's masks. + */ if (matrix_mdev == lstdev) continue; @@ -598,6 +486,20 @@ static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev, return 0; } +static int vfio_ap_mdev_validate_masks(struct ap_matrix_mdev *matrix_mdev, + unsigned long *mdev_apm, + unsigned long *mdev_aqm) +{ + DECLARE_BITMAP(apm, AP_DEVICES); + DECLARE_BITMAP(aqm, AP_DOMAINS); + + if (bitmap_and(apm, mdev_apm, ap_perms.apm, AP_DEVICES) && + bitmap_and(aqm, mdev_aqm, ap_perms.aqm, AP_DOMAINS)) + return -EADDRNOTAVAIL; + + return vfio_ap_mdev_verify_no_sharing(matrix_mdev, mdev_apm, mdev_aqm); +} + /** * vfio_ap_mdev_filter_matrix * @@ -882,33 +784,21 @@ static ssize_t assign_adapter_store(struct device *dev, if (apid > matrix_mdev->matrix.apm_max) return -ENODEV; - /* - * Set the bit in the AP mask (APM) corresponding to the AP adapter - * number (APID). The bits in the mask, from most significant to least - * significant bit, correspond to APIDs 0-255. - */ - mutex_lock(&matrix_dev->lock); - - ret = vfio_ap_mdev_verify_queues_reserved_for_apid(matrix_mdev, apid); - if (ret) - goto done; - memset(apm, 0, sizeof(apm)); set_bit_inv(apid, apm); - ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev, apm, - matrix_mdev->matrix.aqm); - if (ret) - goto done; - + mutex_lock(&matrix_dev->lock); + ret = vfio_ap_mdev_validate_masks(matrix_mdev, apm, + matrix_mdev->matrix.aqm); + if (ret) { + mutex_unlock(&matrix_dev->lock); + return ret; + } set_bit_inv(apid, matrix_mdev->matrix.apm); vfio_ap_mdev_link_queues(matrix_mdev, LINK_APID, apid); - ret = count; - -done: mutex_unlock(&matrix_dev->lock); - return ret; + return count; } static DEVICE_ATTR_WO(assign_adapter); @@ -958,26 +848,6 @@ static ssize_t unassign_adapter_store(struct device *dev, } static DEVICE_ATTR_WO(unassign_adapter); -static int -vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev, - unsigned long apqi) -{ - int ret; - unsigned long apid; - unsigned long nbits = matrix_mdev->matrix.apm_max + 1; - - if (find_first_bit_inv(matrix_mdev->matrix.apm, nbits) >= nbits) - return vfio_ap_verify_queue_reserved(NULL, &apqi); - - for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, nbits) { - ret = vfio_ap_verify_queue_reserved(&apid, &apqi); - if (ret) - return ret; - } - - return 0; -} - /** * assign_domain_store * @@ -1031,28 +901,21 @@ static ssize_t assign_domain_store(struct device *dev, if (apqi > max_apqi) return -ENODEV; - mutex_lock(&matrix_dev->lock); - - ret = vfio_ap_mdev_verify_queues_reserved_for_apqi(matrix_mdev, apqi); - if (ret) - goto done; - memset(aqm, 0, sizeof(aqm)); set_bit_inv(apqi, aqm); - ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev, - matrix_mdev->matrix.apm, aqm); - if (ret) - goto done; - + mutex_lock(&matrix_dev->lock); + ret = vfio_ap_mdev_validate_masks(matrix_mdev, matrix_mdev->matrix.apm, + aqm); + if (ret) { + mutex_unlock(&matrix_dev->lock); + return ret; + } set_bit_inv(apqi, matrix_mdev->matrix.aqm); vfio_ap_mdev_link_queues(matrix_mdev, LINK_APQI, apqi); - ret = count; - -done: mutex_unlock(&matrix_dev->lock); - return ret; + return count; } static DEVICE_ATTR_WO(assign_domain); @@ -1139,11 +1002,6 @@ static ssize_t assign_control_domain_store(struct device *dev, 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);