From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753251AbeDOVXF (ORCPT ); Sun, 15 Apr 2018 17:23:05 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:45458 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753183AbeDOVW5 (ORCPT ); Sun, 15 Apr 2018 17:22:57 -0400 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 Subject: [PATCH v4 10/15] s390: vfio-ap: sysfs interfaces to configure domains Date: Sun, 15 Apr 2018 17:22:20 -0400 X-Mailer: git-send-email 1.7.1 In-Reply-To: <1523827345-11600-1-git-send-email-akrowiak@linux.vnet.ibm.com> References: <1523827345-11600-1-git-send-email-akrowiak@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18041521-0044-0000-0000-000004043AD9 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00008862; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000257; SDB=6.01018429; UDB=6.00519481; IPR=6.00797666; MB=3.00020592; MTD=3.00000008; XFM=3.00000015; UTC=2018-04-15 21:22:54 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18041521-0045-0000-0000-000008363D7F Message-Id: <1523827345-11600-11-git-send-email-akrowiak@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-04-15_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 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1804150214 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Provides the sysfs interfaces for assigning AP domains to and unassigning AP domains from a mediated matrix device. An AP domain ID corresponds to an AP queue index (APQI). For each domain assigned to the mediated matrix device, its corresponging APQI is stored in an AP queue mask (AQM). The bits in the AQM, from most significant to least significant bit, correspond to AP domain numbers 0 to 255. When a domain is assigned, the bit corresponding to its APQI will be set in the AQM. Likewise, when a domain is unassigned, the bit corresponding to its APQI will be cleared from the AQM. The relevant sysfs structures are: /sys/devices/vfio_ap ... [matrix] ...... [mdev_supported_types] ......... [vfio_ap-passthrough] ............ [devices] ...............[$uuid] .................. assign_domain .................. unassign_domain To assign a domain to the $uuid mediated matrix device, write the domain's ID to the assign_domain file. To unassign a domain, write the domain's ID to the unassign_domain file. The ID is specified using conventional semantics: If it begins with 0x, the number will be parsed as a hexadecimal (case insensitive) number; otherwise, it will be parsed as a decimal number. For example, to assign domain 173 (0xad) to the mediated matrix device $uuid: echo 173 > assign_domain or echo 0xad > assign_domain To unassign domain 173 (0xad): echo 173 > unassign_domain or echo 0xad > unassign_domain The assignment will be rejected: * If the domain ID 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 * If no AP adapters have yet been assigned and there are no AP queues reserved by the VFIO AP driver that have an APQN with an APQI matching that of the AP domain number being assigned. * If any of the APQNs that can be derived from the intersection of the APQI being assigned and the AP adapter ID (APID) of each of the AP adapters previously assigned can not be matched with an APQN of an AP queue device reserved by the VFIO AP driver. Signed-off-by: Tony Krowiak --- arch/s390/include/asm/kvm-ap.h | 1 + drivers/s390/crypto/vfio_ap_ops.c | 221 ++++++++++++++++++++++++++++++++++++- 2 files changed, 221 insertions(+), 1 deletions(-) diff --git a/arch/s390/include/asm/kvm-ap.h b/arch/s390/include/asm/kvm-ap.h index 5ebb171..8ee196e 100644 --- a/arch/s390/include/asm/kvm-ap.h +++ b/arch/s390/include/asm/kvm-ap.h @@ -18,6 +18,7 @@ #define KVM_AP_MASK_BYTES(n) DIV_ROUND_UP(n, BITS_PER_BYTE) #define KVM_AP_MAX_APM_INDEX(matrix) (matrix->apm_max - 1) +#define KVM_AP_MAX_AQM_INDEX(matrix) (matrix->aqm_max - 1) /** * The AP matrix is comprised of three bit masks identifying the adapters, diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 6d32adb..d4f9310 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -380,10 +380,229 @@ static ssize_t unassign_adapter_store(struct device *dev, } DEVICE_ATTR_WO(unassign_adapter); +/** + * vfio_ap_validate_queues_for_apqi + * + * @ap_matrix: the matrix device + * @matrix_mdev: the mediated matrix device + * @apqi: an AP queue index (APQI) - corresponds to a domain ID + * + * Verifies that each APQN that is derived from the intersection of @apqi and + * each AP adapter ID (APID) corresponding to an AP domain assigned to the + * @matrix_mdev matches the APQN of an AP queue reserved by the VFIO AP device + * driver. + * + * Returns 0 if validation succeeds; otherwise, returns an error. + */ +static int vfio_ap_validate_queues_for_apqi(struct ap_matrix *ap_matrix, + struct ap_matrix_mdev *matrix_mdev, + unsigned long apqi) +{ + int ret; + struct vfio_ap_qid_match qid_match; + unsigned long apid; + struct device_driver *drv = ap_matrix->device.driver; + + /** + * Examine each APQN with the specified APQI + */ + for_each_set_bit_inv(apid, matrix_mdev->matrix->apm, + matrix_mdev->matrix->apm_max) { + qid_match.qid = AP_MKQID(apid, apqi); + qid_match.dev = NULL; + + ret = driver_for_each_device(drv, NULL, &qid_match, + vfio_ap_queue_match); + if (ret) { + pr_err("%s: Error %d validating AP queue %02lx.%04lx reservation", + VFIO_AP_MODULE_NAME, ret, apid, apqi); + + return ret; + } + + /* + * If the APQN identifies an AP queue that is reserved by the + * VFIO AP device driver, continue processing. + */ + if (qid_match.dev) + continue; + + pr_err("%s: AP queue %02lx.%04lx not reserved by %s driver", + VFIO_AP_MODULE_NAME, apid, apqi, VFIO_AP_DRV_NAME); + + return -ENXIO; + } + + return 0; +} + +struct vfio_ap_apqi_reserved { + unsigned long apqi; + bool reserved; +}; + +/** + * vfio_ap_queue_id_contains_apqi + * + * @dev: an AP queue device + * @data: an AP queue index (APQI) + * + * Returns 1 (true) if the APQI (@data) is contained in the AP queue's + * identifier; otherwise, returns 0; + */ +static int vfio_ap_queue_id_contains_apqi(struct device *dev, void *data) +{ + struct vfio_ap_apqi_reserved *apqi_res = data; + struct ap_queue *ap_queue = to_ap_queue(dev); + + if (apqi_res->apqi == AP_QID_QUEUE(ap_queue->qid)) + apqi_res->reserved = true; + + return 0; +} + +/** + * vfio_ap_verify_apqi_reserved + * + * @ap_matrix: the AP matrix configured for the mediated matrix device + * @apqi: the AP queue index (APQI) - corresponds to domain ID + * + * Verifies that at least one AP queue reserved by the VFIO AP device driver + * has an APQN containing @apqi. + * + * Returns 0 if the APQI is reserved; otherwise, returns -ENODEV. + */ +static int vfio_ap_verify_apqi_reserved(struct ap_matrix *ap_matrix, + unsigned long apqi) +{ + int ret; + struct vfio_ap_apqi_reserved apqi_res; + + apqi_res.apqi = apqi; + + ret = driver_for_each_device(ap_matrix->device.driver, NULL, + &apqi_res, + vfio_ap_queue_id_contains_apqi); + if (ret) { + pr_err("%s: Error %d validating AP queue index %04lx reservation", + VFIO_AP_MODULE_NAME, ret, apqi); + return ret; + } + + if (apqi_res.reserved) + return 0; + + pr_err("%s: no APQNs with domain ID %02lx are reserved by %s driver", + VFIO_AP_MODULE_NAME, apqi, VFIO_AP_DRV_NAME); + + return -ENODEV; +} + +/** + * vfio_ap_validate_apqi + * + * @matrix_mdev: the mediated matrix device + * @apqi: the APQI (domain ID) to validate + * + * Validates the value of @apqi: + * * If there are no AP adapters assigned, then there must be at least + * one AP queue device reserved by the VFIO AP device driver with an + * APQN containing @apqi. + * + * * Else each APQN that can be derived from the intersection of @apqi and + * the IDs of the AP adapters already assigned must identify an AP queue + * that has been reserved by the VFIO AP device driver. + * + * Returns 0 if the value of @apqi is valid; otherwise, returns an error. + */ +static int vfio_ap_validate_apqi(struct mdev_device *mdev, + struct ap_matrix_mdev *matrix_mdev, + unsigned long apqi) +{ + int ret; + struct device *dev = mdev_parent_dev(mdev); + struct ap_matrix *ap_matrix = to_ap_matrix(dev); + unsigned long apid; + + apid = find_first_bit_inv(matrix_mdev->matrix->apm, + matrix_mdev->matrix->apm_max); + /* If there are no adapters assigned */ + if (apid == matrix_mdev->matrix->apm_max) { + ret = vfio_ap_verify_apqi_reserved(ap_matrix, apqi); + } else { + ret = vfio_ap_validate_queues_for_apqi(ap_matrix, matrix_mdev, + apqi); + } + + if (ret) + return ret; + + return 0; +} + +static ssize_t assign_domain_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + unsigned long apqi; + struct mdev_device *mdev = mdev_from_dev(dev); + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); + int maxid = KVM_AP_MAX_AQM_INDEX(matrix_mdev->matrix); + + ret = kstrtoul(buf, 0, &apqi); + if (ret || (apqi > maxid)) { + pr_err("%s: domain id '%s' not a value from 0 to %02d(%#04x)", + VFIO_AP_MODULE_NAME, buf, maxid, maxid); + + return ret ? ret : -EINVAL; + } + + ret = vfio_ap_validate_apqi(mdev, matrix_mdev, apqi); + if (ret) + return ret; + + /* Set the bit in the AQM (bitmask) corresponding to the AP domain + * number (APQI). The bits in the mask, from most significant to least + * significant, correspond to numbers 0-255. + */ + set_bit_inv(apqi, matrix_mdev->matrix->aqm); + + return count; +} +DEVICE_ATTR_WO(assign_domain); + +static ssize_t unassign_domain_store(struct device *dev, + struct device_attribute *attr, + const char *buf, size_t count) +{ + int ret; + unsigned long apqi; + struct mdev_device *mdev = mdev_from_dev(dev); + struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev); + int maxid = KVM_AP_MAX_AQM_INDEX(matrix_mdev->matrix); + + ret = kstrtoul(buf, 0, &apqi); + if (ret || (apqi > maxid)) { + pr_err("%s: domain id '%s' not a value from 0 to %02d(%#04x)", + VFIO_AP_MODULE_NAME, buf, maxid, maxid); + + return ret ? ret : -EINVAL; + } + + clear_bit_inv((unsigned long)apqi, + (unsigned long *)matrix_mdev->matrix->aqm); + + return count; +} +DEVICE_ATTR_WO(unassign_domain); + static struct attribute *vfio_ap_mdev_attrs[] = { &dev_attr_assign_adapter.attr, &dev_attr_unassign_adapter.attr, - NULL + &dev_attr_assign_domain.attr, + &dev_attr_unassign_domain.attr, + NULL, }; static struct attribute_group vfio_ap_mdev_attr_group = { -- 1.7.1