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Wed, 31 Mar 2021 15:23:26 +0000 (GMT) Received: from b03ledav001.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D8EE66E04E; Wed, 31 Mar 2021 15:23:24 +0000 (GMT) Received: from cpe-66-24-58-13.stny.res.rr.com.com (unknown [9.85.146.149]) by b03ledav001.gho.boulder.ibm.com (Postfix) with ESMTP; Wed, 31 Mar 2021 15:23:24 +0000 (GMT) From: Tony Krowiak To: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Cc: jjherne@linux.ibm.com, 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, frankja@linux.ibm.com, david@redhat.com, hca@linux.ibm.com, gor@linux.ibm.com, Tony Krowiak Subject: [PATCH v14 08/13] s390/vfio-ap: allow hot plug/unplug of AP resources using mdev device Date: Wed, 31 Mar 2021 11:22:51 -0400 Message-Id: <20210331152256.28129-9-akrowiak@linux.ibm.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20210331152256.28129-1-akrowiak@linux.ibm.com> References: <20210331152256.28129-1-akrowiak@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: e_yi7MHoYDQa-W89n6yAkgNAEZMSpmVC X-Proofpoint-ORIG-GUID: 5IAAqmmaQT-9m7JysDkYhpDANjr41TcC X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.369,18.0.761 definitions=2021-03-31_06:2021-03-31,2021-03-31 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=999 priorityscore=1501 clxscore=1015 phishscore=0 lowpriorityscore=0 adultscore=0 suspectscore=0 bulkscore=0 malwarescore=0 spamscore=0 mlxscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2103300000 definitions=main-2103310107 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Let's allow adapters, domains and control domains to be hot plugged into and hot unplugged from a KVM guest using a matrix mdev when: * The adapter, domain or control domain is assigned to or unassigned from the matrix mdev * A queue device with an APQN assigned to the matrix mdev is bound to or unbound from the vfio_ap device driver. Whenever an assignment or unassignment of an adapter, domain or control domain is performed as well as when a bind or unbind of a queue device is executed, the AP control block (APCB) that supplies the AP configuration to the guest is first refreshed. After refreshing the APCB, if the mdev is in use by a KVM guest, it is hot plugged into the guest to provide access to dynamically provide access to the adapters, domains and control domains provided via the newly refreshed APCB. Signed-off-by: Tony Krowiak Acked-by: Halil Pasic --- drivers/s390/crypto/vfio_ap_ops.c | 72 +++++++++++++++++++++++++++---- 1 file changed, 63 insertions(+), 9 deletions(-) diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c index 1f2a3049b283..2578dfe68cda 100644 --- a/drivers/s390/crypto/vfio_ap_ops.c +++ b/drivers/s390/crypto/vfio_ap_ops.c @@ -311,6 +311,20 @@ static void vfio_ap_matrix_init(struct ap_config_info *info, matrix->adm_max = info->apxa ? info->Nd : 15; } +static bool vfio_ap_mdev_has_crycb(struct ap_matrix_mdev *matrix_mdev) +{ + return (matrix_mdev->kvm && matrix_mdev->kvm->arch.crypto.crycbd); +} + +static void vfio_ap_mdev_commit_apcb(struct ap_matrix_mdev *matrix_mdev) +{ + if (vfio_ap_mdev_has_crycb(matrix_mdev)) + kvm_arch_crypto_set_masks(matrix_mdev->kvm, + matrix_mdev->shadow_apcb.apm, + matrix_mdev->shadow_apcb.aqm, + matrix_mdev->shadow_apcb.adm); +} + /* * vfio_ap_mdev_filter_apcb * @@ -378,6 +392,7 @@ static void vfio_ap_mdev_refresh_apcb(struct ap_matrix_mdev *matrix_mdev) sizeof(struct ap_matrix)) != 0) { memcpy(&matrix_mdev->shadow_apcb, &shadow_apcb, sizeof(struct ap_matrix)); + vfio_ap_mdev_commit_apcb(matrix_mdev); } } @@ -655,7 +670,7 @@ static ssize_t assign_adapter_store(struct device *dev, * If the KVM pointer is in flux or the guest is running, disallow * un-assignment of adapter */ - if (matrix_mdev->kvm_busy || matrix_mdev->kvm) { + if (matrix_mdev->kvm_busy) { ret = -EBUSY; goto done; } @@ -728,7 +743,7 @@ static ssize_t unassign_adapter_store(struct device *dev, * If the KVM pointer is in flux or the guest is running, disallow * un-assignment of adapter */ - if (matrix_mdev->kvm_busy || matrix_mdev->kvm) { + if (matrix_mdev->kvm_busy) { ret = -EBUSY; goto done; } @@ -809,7 +824,7 @@ static ssize_t assign_domain_store(struct device *dev, * If the KVM pointer is in flux or the guest is running, disallow * assignment of domain */ - if (matrix_mdev->kvm_busy || matrix_mdev->kvm) { + if (matrix_mdev->kvm_busy) { ret = -EBUSY; goto done; } @@ -881,7 +896,7 @@ static ssize_t unassign_domain_store(struct device *dev, * If the KVM pointer is in flux or the guest is running, disallow * un-assignment of domain */ - if (matrix_mdev->kvm_busy || matrix_mdev->kvm) { + if (matrix_mdev->kvm_busy) { ret = -EBUSY; goto done; } @@ -906,6 +921,16 @@ static ssize_t unassign_domain_store(struct device *dev, } static DEVICE_ATTR_WO(unassign_domain); +static void vfio_ap_mdev_hot_plug_cdom(struct ap_matrix_mdev *matrix_mdev, + unsigned long domid) +{ + if (!test_bit_inv(domid, matrix_mdev->shadow_apcb.adm) && + test_bit_inv(domid, (unsigned long *)matrix_dev->info.adm)) { + set_bit_inv(domid, matrix_mdev->shadow_apcb.adm); + vfio_ap_mdev_commit_apcb(matrix_mdev); + } +} + /** * assign_control_domain_store * @@ -937,7 +962,7 @@ static ssize_t assign_control_domain_store(struct device *dev, * If the KVM pointer is in flux or the guest is running, disallow * assignment of control domain. */ - if (matrix_mdev->kvm_busy || matrix_mdev->kvm) { + if (matrix_mdev->kvm_busy) { ret = -EBUSY; goto done; } @@ -957,7 +982,7 @@ static ssize_t assign_control_domain_store(struct device *dev, * number of control domains that can be assigned. */ set_bit_inv(id, matrix_mdev->matrix.adm); - vfio_ap_mdev_refresh_apcb(matrix_mdev); + vfio_ap_mdev_hot_plug_cdom(matrix_mdev, id); ret = count; done: mutex_unlock(&matrix_dev->lock); @@ -965,6 +990,15 @@ static ssize_t assign_control_domain_store(struct device *dev, } static DEVICE_ATTR_WO(assign_control_domain); +static void vfio_ap_mdev_hot_unplug_cdom(struct ap_matrix_mdev *matrix_mdev, + unsigned long domid) +{ + if (test_bit_inv(domid, matrix_mdev->shadow_apcb.adm)) { + clear_bit_inv(domid, matrix_mdev->shadow_apcb.adm); + vfio_ap_mdev_commit_apcb(matrix_mdev); + } +} + /** * unassign_control_domain_store * @@ -997,7 +1031,7 @@ static ssize_t unassign_control_domain_store(struct device *dev, * If the KVM pointer is in flux or the guest is running, disallow * un-assignment of control domain. */ - if (matrix_mdev->kvm_busy || matrix_mdev->kvm) { + if (matrix_mdev->kvm_busy) { ret = -EBUSY; goto done; } @@ -1011,7 +1045,7 @@ static ssize_t unassign_control_domain_store(struct device *dev, } clear_bit_inv(domid, matrix_mdev->matrix.adm); - vfio_ap_mdev_refresh_apcb(matrix_mdev); + vfio_ap_mdev_hot_unplug_cdom(matrix_mdev, domid); ret = count; done: mutex_unlock(&matrix_dev->lock); @@ -1508,8 +1542,18 @@ int vfio_ap_mdev_probe_queue(struct ap_device *apdev) q->apqn = to_ap_queue(&apdev->device)->qid; q->saved_isc = VFIO_AP_ISC_INVALID; vfio_ap_queue_link_mdev(q); - if (q->matrix_mdev) + if (q->matrix_mdev) { + /* + * If the KVM pointer is in the process of being set, wait until the + * process has completed. + */ + wait_event_cmd(q->matrix_mdev->wait_for_kvm, + !q->matrix_mdev->kvm_busy, + mutex_unlock(&matrix_dev->lock), + mutex_lock(&matrix_dev->lock)); + vfio_ap_mdev_refresh_apcb(q->matrix_mdev); + } dev_set_drvdata(&apdev->device, q); mutex_unlock(&matrix_dev->lock); @@ -1525,6 +1569,16 @@ void vfio_ap_mdev_remove_queue(struct ap_device *apdev) if (q->matrix_mdev) { vfio_ap_mdev_unlink_queue_fr_mdev(q); + + /* + * If the KVM pointer is in the process of being set, wait until the + * process has completed. + */ + wait_event_cmd(q->matrix_mdev->wait_for_kvm, + !q->matrix_mdev->kvm_busy, + mutex_unlock(&matrix_dev->lock), + mutex_lock(&matrix_dev->lock)); + vfio_ap_mdev_refresh_apcb(q->matrix_mdev); } -- 2.21.3