From patchwork Wed Jul 31 22:41:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Anthony Krowiak X-Patchwork-Id: 11069739 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 99774174A for ; Wed, 31 Jul 2019 22:42:01 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 86B81204FA for ; Wed, 31 Jul 2019 22:42:01 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7AFBD27FE4; Wed, 31 Jul 2019 22:42:01 +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 0E2AA28068 for ; Wed, 31 Jul 2019 22:42:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729633AbfGaWli (ORCPT ); Wed, 31 Jul 2019 18:41:38 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:25254 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729527AbfGaWlg (ORCPT ); Wed, 31 Jul 2019 18:41:36 -0400 Received: from pps.filterd (m0098416.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6VMfZpa105468 for ; Wed, 31 Jul 2019 18:41:35 -0400 Received: from e13.ny.us.ibm.com (e13.ny.us.ibm.com [129.33.205.203]) by mx0b-001b2d01.pphosted.com with ESMTP id 2u3hcrnuu1-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Wed, 31 Jul 2019 18:41:35 -0400 Received: from localhost by e13.ny.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, 31 Jul 2019 23:41:27 +0100 Received: from b01ledav001.gho.pok.ibm.com (b01ledav001.gho.pok.ibm.com [9.57.199.106]) by b01cxnp23034.gho.pok.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6VMfO5E51184120 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Wed, 31 Jul 2019 22:41:24 GMT Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 508A928058; Wed, 31 Jul 2019 22:41:24 +0000 (GMT) Received: from b01ledav001.gho.pok.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 878A028059; Wed, 31 Jul 2019 22:41:23 +0000 (GMT) Received: from akrowiak-ThinkPad-P50.ibm.com (unknown [9.85.130.145]) by b01ledav001.gho.pok.ibm.com (Postfix) with ESMTPS; Wed, 31 Jul 2019 22:41:23 +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, frankja@linux.ibm.com, david@redhat.com, mjrosato@linux.ibm.com, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, pmorel@linux.ibm.com, pasic@linux.ibm.com, alex.williamson@redhat.com, kwankhede@nvidia.com, Tony Krowiak Subject: [PATCH v5 3/7] s390: vfio-ap: implement in-use callback for vfio_ap driver Date: Wed, 31 Jul 2019 18:41:13 -0400 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1564612877-7598-1-git-send-email-akrowiak@linux.ibm.com> References: <1564612877-7598-1-git-send-email-akrowiak@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19073122-0064-0000-0000-000004051B3C X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00011531; HX=3.00000242; KW=3.00000007; PH=3.00000004; SC=3.00000287; SDB=6.01240262; UDB=6.00654007; IPR=6.01021683; MB=3.00027986; MTD=3.00000008; XFM=3.00000015; UTC=2019-07-31 22:41:29 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19073122-0065-0000-0000-00003E7E76AC Message-Id: <1564612877-7598-4-git-send-email-akrowiak@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-31_11:,, 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=8.0.1-1906280000 definitions=main-1907310226 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Let's implement the callback to indicate when an APQN is in use by the vfio_ap device driver. The callback is invoked whenever a change to the apmask or aqmask may result in one or APQNs being removed from the driver. The vfio_ap device driver will indicate a resource is in use if any of the removed APQNs are assigned to any of the matrix mdev devices. To ensure that the AP bus apmask/aqmask interfaces are used to control which AP queues get manually bound to or unbound from the vfio_ap device driver, the bind/unbind sysfs interfaces will be disabled for the vfio_ap device driver. The reasons for this are: * To prevent unbinding an AP queue device from the vfio_ap device driver representing a queue that is assigned to an mdev device. * To enforce the policy that the the AP resources must first be unassigned from the mdev device - which will hot unplug them from a guest using the mdev device - before changing ownership of APQNs from the vfio_ap driver to a zcrypt driver. This ensures that private crypto data intended for the guest will never be accessible from the host. * It takes advantage of the AP architecture to prevent dynamic changes to the LPAR configuration using the SE or SCLP commands from compromising the guest crypto devices. For example: * Even if an adapter is configured off, if and when it is configured back on, the queue devices associated with the adapter will be bound back to the vfio_ap driver and the queues will automatically be available to a guest using the mdev to which the APQN of the queue device is assigned. * If adapters or domains are dynamically unassigned from the LPAR in which the linux guest is running, effective masking will prevent access to the AP resources by a guest using them. Signed-off-by: Tony Krowiak --- drivers/s390/crypto/vfio_ap_drv.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/s390/crypto/vfio_ap_drv.c b/drivers/s390/crypto/vfio_ap_drv.c index 9e61d4c6e6b5..d8da520ae1fa 100644 --- a/drivers/s390/crypto/vfio_ap_drv.c +++ b/drivers/s390/crypto/vfio_ap_drv.c @@ -158,6 +158,34 @@ static void vfio_ap_matrix_dev_destroy(void) root_device_unregister(root_device); } +static bool vfio_ap_resource_in_use(unsigned long *apm, unsigned long *aqm) +{ + bool in_use = false; + struct ap_matrix_mdev *matrix_mdev; + DECLARE_BITMAP(apm_intrsctn, AP_DEVICES); + DECLARE_BITMAP(aqm_intrsctn, AP_DOMAINS); + + mutex_lock(&matrix_dev->lock); + + list_for_each_entry(matrix_mdev, &matrix_dev->mdev_list, node) { + bitmap_and(apm_intrsctn, apm, matrix_mdev->matrix.apm, + AP_DEVICES); + if (find_first_bit_inv(apm_intrsctn, AP_DEVICES) == AP_DEVICES) + continue; + + bitmap_and(aqm_intrsctn, aqm, matrix_mdev->matrix.aqm, + AP_DOMAINS); + if (find_first_bit_inv(aqm_intrsctn, AP_DEVICES) == AP_DOMAINS) + continue; + + in_use = true; + } + + mutex_unlock(&matrix_dev->lock); + + return in_use; +} + static int __init vfio_ap_init(void) { int ret; @@ -173,7 +201,9 @@ static int __init vfio_ap_init(void) memset(&vfio_ap_drv, 0, sizeof(vfio_ap_drv)); vfio_ap_drv.probe = vfio_ap_queue_dev_probe; vfio_ap_drv.remove = vfio_ap_queue_dev_remove; + vfio_ap_drv.in_use = vfio_ap_resource_in_use; vfio_ap_drv.ids = ap_queue_ids; + vfio_ap_drv.driver.suppress_bind_attrs = true; ret = ap_driver_register(&vfio_ap_drv, THIS_MODULE, VFIO_AP_DRV_NAME); if (ret) {