![Christian Borntraeger](/assets/img/avatar_default.png)
no functional change, just hygiene. Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Reviewed-by: Cornelia Huck <cohuck@redhat.com> Reviewed-by: David Hildenbrand <david@redhat.com>
940 lines
24 KiB
C
940 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* Adjunct processor matrix VFIO device driver callbacks.
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*
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* Copyright IBM Corp. 2018
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*
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* Author(s): Tony Krowiak <akrowiak@linux.ibm.com>
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* Halil Pasic <pasic@linux.ibm.com>
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* Pierre Morel <pmorel@linux.ibm.com>
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*/
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#include <linux/string.h>
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#include <linux/vfio.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/ctype.h>
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#include <linux/bitops.h>
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#include <linux/kvm_host.h>
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#include <linux/module.h>
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#include <asm/kvm.h>
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#include <asm/zcrypt.h>
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#include "vfio_ap_private.h"
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#define VFIO_AP_MDEV_TYPE_HWVIRT "passthrough"
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#define VFIO_AP_MDEV_NAME_HWVIRT "VFIO AP Passthrough Device"
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static void vfio_ap_matrix_init(struct ap_config_info *info,
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struct ap_matrix *matrix)
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{
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matrix->apm_max = info->apxa ? info->Na : 63;
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matrix->aqm_max = info->apxa ? info->Nd : 15;
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matrix->adm_max = info->apxa ? info->Nd : 15;
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}
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static int vfio_ap_mdev_create(struct kobject *kobj, struct mdev_device *mdev)
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{
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struct ap_matrix_mdev *matrix_mdev;
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if ((atomic_dec_if_positive(&matrix_dev->available_instances) < 0))
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return -EPERM;
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matrix_mdev = kzalloc(sizeof(*matrix_mdev), GFP_KERNEL);
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if (!matrix_mdev) {
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atomic_inc(&matrix_dev->available_instances);
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return -ENOMEM;
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}
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vfio_ap_matrix_init(&matrix_dev->info, &matrix_mdev->matrix);
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mdev_set_drvdata(mdev, matrix_mdev);
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mutex_lock(&matrix_dev->lock);
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list_add(&matrix_mdev->node, &matrix_dev->mdev_list);
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mutex_unlock(&matrix_dev->lock);
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return 0;
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}
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static int vfio_ap_mdev_remove(struct mdev_device *mdev)
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{
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struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
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if (matrix_mdev->kvm)
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return -EBUSY;
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mutex_lock(&matrix_dev->lock);
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list_del(&matrix_mdev->node);
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mutex_unlock(&matrix_dev->lock);
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kfree(matrix_mdev);
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mdev_set_drvdata(mdev, NULL);
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atomic_inc(&matrix_dev->available_instances);
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return 0;
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}
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static ssize_t name_show(struct kobject *kobj, struct device *dev, char *buf)
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{
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return sprintf(buf, "%s\n", VFIO_AP_MDEV_NAME_HWVIRT);
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}
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static MDEV_TYPE_ATTR_RO(name);
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static ssize_t available_instances_show(struct kobject *kobj,
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struct device *dev, char *buf)
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{
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return sprintf(buf, "%d\n",
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atomic_read(&matrix_dev->available_instances));
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}
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static MDEV_TYPE_ATTR_RO(available_instances);
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static ssize_t device_api_show(struct kobject *kobj, struct device *dev,
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char *buf)
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{
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return sprintf(buf, "%s\n", VFIO_DEVICE_API_AP_STRING);
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}
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static MDEV_TYPE_ATTR_RO(device_api);
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static struct attribute *vfio_ap_mdev_type_attrs[] = {
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&mdev_type_attr_name.attr,
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&mdev_type_attr_device_api.attr,
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&mdev_type_attr_available_instances.attr,
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NULL,
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};
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static struct attribute_group vfio_ap_mdev_hwvirt_type_group = {
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.name = VFIO_AP_MDEV_TYPE_HWVIRT,
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.attrs = vfio_ap_mdev_type_attrs,
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};
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static struct attribute_group *vfio_ap_mdev_type_groups[] = {
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&vfio_ap_mdev_hwvirt_type_group,
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NULL,
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};
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struct vfio_ap_queue_reserved {
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unsigned long *apid;
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unsigned long *apqi;
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bool reserved;
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};
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/**
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* vfio_ap_has_queue
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*
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* @dev: an AP queue device
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* @data: a struct vfio_ap_queue_reserved reference
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*
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* Flags whether the AP queue device (@dev) has a queue ID containing the APQN,
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* apid or apqi specified in @data:
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*
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* - If @data contains both an apid and apqi value, then @data will be flagged
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* as reserved if the APID and APQI fields for the AP queue device matches
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*
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* - If @data contains only an apid value, @data will be flagged as
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* reserved if the APID field in the AP queue device matches
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*
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* - If @data contains only an apqi value, @data will be flagged as
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* reserved if the APQI field in the AP queue device matches
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*
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* Returns 0 to indicate the input to function succeeded. Returns -EINVAL if
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* @data does not contain either an apid or apqi.
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*/
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static int vfio_ap_has_queue(struct device *dev, void *data)
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{
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struct vfio_ap_queue_reserved *qres = data;
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struct ap_queue *ap_queue = to_ap_queue(dev);
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ap_qid_t qid;
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unsigned long id;
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if (qres->apid && qres->apqi) {
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qid = AP_MKQID(*qres->apid, *qres->apqi);
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if (qid == ap_queue->qid)
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qres->reserved = true;
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} else if (qres->apid && !qres->apqi) {
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id = AP_QID_CARD(ap_queue->qid);
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if (id == *qres->apid)
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qres->reserved = true;
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} else if (!qres->apid && qres->apqi) {
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id = AP_QID_QUEUE(ap_queue->qid);
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if (id == *qres->apqi)
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qres->reserved = true;
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} else {
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return -EINVAL;
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}
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return 0;
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}
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/**
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* vfio_ap_verify_queue_reserved
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*
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* @matrix_dev: a mediated matrix device
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* @apid: an AP adapter ID
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* @apqi: an AP queue index
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*
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* Verifies that the AP queue with @apid/@apqi is reserved by the VFIO AP device
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* driver according to the following rules:
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*
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* - If both @apid and @apqi are not NULL, then there must be an AP queue
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* device bound to the vfio_ap driver with the APQN identified by @apid and
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* @apqi
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*
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* - If only @apid is not NULL, then there must be an AP queue device bound
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* to the vfio_ap driver with an APQN containing @apid
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*
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* - If only @apqi is not NULL, then there must be an AP queue device bound
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* to the vfio_ap driver with an APQN containing @apqi
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*
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* Returns 0 if the AP queue is reserved; otherwise, returns -EADDRNOTAVAIL.
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*/
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static int vfio_ap_verify_queue_reserved(unsigned long *apid,
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unsigned long *apqi)
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{
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int ret;
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struct vfio_ap_queue_reserved qres;
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qres.apid = apid;
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qres.apqi = apqi;
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qres.reserved = false;
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ret = driver_for_each_device(matrix_dev->device.driver, NULL, &qres,
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vfio_ap_has_queue);
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if (ret)
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return ret;
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if (qres.reserved)
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return 0;
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return -EADDRNOTAVAIL;
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}
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static int
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vfio_ap_mdev_verify_queues_reserved_for_apid(struct ap_matrix_mdev *matrix_mdev,
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unsigned long apid)
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{
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int ret;
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unsigned long apqi;
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unsigned long nbits = matrix_mdev->matrix.aqm_max + 1;
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if (find_first_bit_inv(matrix_mdev->matrix.aqm, nbits) >= nbits)
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return vfio_ap_verify_queue_reserved(&apid, NULL);
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for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, nbits) {
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ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* vfio_ap_mdev_verify_no_sharing
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*
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* Verifies that the APQNs derived from the cross product of the AP adapter IDs
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* and AP queue indexes comprising the AP matrix are not configured for another
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* mediated device. AP queue sharing is not allowed.
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*
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* @matrix_mdev: the mediated matrix device
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*
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* Returns 0 if the APQNs are not shared, otherwise; returns -EADDRINUSE.
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*/
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static int vfio_ap_mdev_verify_no_sharing(struct ap_matrix_mdev *matrix_mdev)
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{
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struct ap_matrix_mdev *lstdev;
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DECLARE_BITMAP(apm, AP_DEVICES);
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DECLARE_BITMAP(aqm, AP_DOMAINS);
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list_for_each_entry(lstdev, &matrix_dev->mdev_list, node) {
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if (matrix_mdev == lstdev)
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continue;
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memset(apm, 0, sizeof(apm));
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memset(aqm, 0, sizeof(aqm));
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/*
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* We work on full longs, as we can only exclude the leftover
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* bits in non-inverse order. The leftover is all zeros.
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*/
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if (!bitmap_and(apm, matrix_mdev->matrix.apm,
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lstdev->matrix.apm, AP_DEVICES))
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continue;
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if (!bitmap_and(aqm, matrix_mdev->matrix.aqm,
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lstdev->matrix.aqm, AP_DOMAINS))
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continue;
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return -EADDRINUSE;
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}
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return 0;
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}
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/**
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* assign_adapter_store
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*
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* @dev: the matrix device
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* @attr: the mediated matrix device's assign_adapter attribute
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* @buf: a buffer containing the AP adapter number (APID) to
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* be assigned
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* @count: the number of bytes in @buf
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*
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* Parses the APID from @buf and sets the corresponding bit in the mediated
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* matrix device's APM.
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*
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* Returns the number of bytes processed if the APID is valid; otherwise,
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* returns one of the following errors:
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*
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* 1. -EINVAL
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* The APID is not a valid number
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*
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* 2. -ENODEV
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* The APID exceeds the maximum value configured for the system
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*
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* 3. -EADDRNOTAVAIL
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* An APQN derived from the cross product of the APID being assigned
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* and the APQIs previously assigned is not bound to the vfio_ap device
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* driver; or, if no APQIs have yet been assigned, the APID is not
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* contained in an APQN bound to the vfio_ap device driver.
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*
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* 4. -EADDRINUSE
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* An APQN derived from the cross product of the APID being assigned
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* and the APQIs previously assigned is being used by another mediated
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* matrix device
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*/
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static ssize_t assign_adapter_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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unsigned long apid;
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struct mdev_device *mdev = mdev_from_dev(dev);
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struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
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/* If the guest is running, disallow assignment of adapter */
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if (matrix_mdev->kvm)
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return -EBUSY;
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ret = kstrtoul(buf, 0, &apid);
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if (ret)
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return ret;
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if (apid > matrix_mdev->matrix.apm_max)
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return -ENODEV;
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/*
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* Set the bit in the AP mask (APM) corresponding to the AP adapter
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* number (APID). The bits in the mask, from most significant to least
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* significant bit, correspond to APIDs 0-255.
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*/
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mutex_lock(&matrix_dev->lock);
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ret = vfio_ap_mdev_verify_queues_reserved_for_apid(matrix_mdev, apid);
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if (ret)
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goto done;
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set_bit_inv(apid, matrix_mdev->matrix.apm);
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ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
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if (ret)
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goto share_err;
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ret = count;
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goto done;
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share_err:
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clear_bit_inv(apid, matrix_mdev->matrix.apm);
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done:
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mutex_unlock(&matrix_dev->lock);
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return ret;
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}
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static DEVICE_ATTR_WO(assign_adapter);
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/**
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* unassign_adapter_store
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*
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* @dev: the matrix device
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* @attr: the mediated matrix device's unassign_adapter attribute
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* @buf: a buffer containing the adapter number (APID) to be unassigned
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* @count: the number of bytes in @buf
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*
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* Parses the APID from @buf and clears the corresponding bit in the mediated
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* matrix device's APM.
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*
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* Returns the number of bytes processed if the APID is valid; otherwise,
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* returns one of the following errors:
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* -EINVAL if the APID is not a number
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* -ENODEV if the APID it exceeds the maximum value configured for the
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* system
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*/
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static ssize_t unassign_adapter_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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unsigned long apid;
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struct mdev_device *mdev = mdev_from_dev(dev);
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struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
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/* If the guest is running, disallow un-assignment of adapter */
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if (matrix_mdev->kvm)
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return -EBUSY;
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ret = kstrtoul(buf, 0, &apid);
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if (ret)
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return ret;
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if (apid > matrix_mdev->matrix.apm_max)
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return -ENODEV;
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mutex_lock(&matrix_dev->lock);
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clear_bit_inv((unsigned long)apid, matrix_mdev->matrix.apm);
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mutex_unlock(&matrix_dev->lock);
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return count;
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}
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static DEVICE_ATTR_WO(unassign_adapter);
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static int
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vfio_ap_mdev_verify_queues_reserved_for_apqi(struct ap_matrix_mdev *matrix_mdev,
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unsigned long apqi)
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{
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int ret;
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unsigned long apid;
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unsigned long nbits = matrix_mdev->matrix.apm_max + 1;
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if (find_first_bit_inv(matrix_mdev->matrix.apm, nbits) >= nbits)
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return vfio_ap_verify_queue_reserved(NULL, &apqi);
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for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, nbits) {
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ret = vfio_ap_verify_queue_reserved(&apid, &apqi);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* assign_domain_store
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*
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* @dev: the matrix device
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* @attr: the mediated matrix device's assign_domain attribute
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* @buf: a buffer containing the AP queue index (APQI) of the domain to
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* be assigned
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* @count: the number of bytes in @buf
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*
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* Parses the APQI from @buf and sets the corresponding bit in the mediated
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* matrix device's AQM.
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*
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* Returns the number of bytes processed if the APQI is valid; otherwise returns
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* one of the following errors:
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*
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* 1. -EINVAL
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* The APQI is not a valid number
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*
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* 2. -ENODEV
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* The APQI exceeds the maximum value configured for the system
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*
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* 3. -EADDRNOTAVAIL
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* An APQN derived from the cross product of the APQI being assigned
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* and the APIDs previously assigned is not bound to the vfio_ap device
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* driver; or, if no APIDs have yet been assigned, the APQI is not
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* contained in an APQN bound to the vfio_ap device driver.
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*
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* 4. -EADDRINUSE
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* An APQN derived from the cross product of the APQI being assigned
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* and the APIDs previously assigned is being used by another mediated
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* matrix device
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*/
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static ssize_t assign_domain_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int ret;
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unsigned long apqi;
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struct mdev_device *mdev = mdev_from_dev(dev);
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struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
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unsigned long max_apqi = matrix_mdev->matrix.aqm_max;
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/* If the guest is running, disallow assignment of domain */
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if (matrix_mdev->kvm)
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return -EBUSY;
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ret = kstrtoul(buf, 0, &apqi);
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if (ret)
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return ret;
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if (apqi > max_apqi)
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return -ENODEV;
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mutex_lock(&matrix_dev->lock);
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ret = vfio_ap_mdev_verify_queues_reserved_for_apqi(matrix_mdev, apqi);
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if (ret)
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goto done;
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set_bit_inv(apqi, matrix_mdev->matrix.aqm);
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ret = vfio_ap_mdev_verify_no_sharing(matrix_mdev);
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if (ret)
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goto share_err;
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ret = count;
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goto done;
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share_err:
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clear_bit_inv(apqi, matrix_mdev->matrix.aqm);
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done:
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mutex_unlock(&matrix_dev->lock);
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return ret;
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}
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static DEVICE_ATTR_WO(assign_domain);
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/**
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* unassign_domain_store
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*
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* @dev: the matrix device
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* @attr: the mediated matrix device's unassign_domain attribute
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* @buf: a buffer containing the AP queue index (APQI) of the domain to
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* be unassigned
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* @count: the number of bytes in @buf
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*
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* Parses the APQI from @buf and clears the corresponding bit in the
|
|
* mediated matrix device's AQM.
|
|
*
|
|
* Returns the number of bytes processed if the APQI is valid; otherwise,
|
|
* returns one of the following errors:
|
|
* -EINVAL if the APQI is not a number
|
|
* -ENODEV if the APQI exceeds the maximum value configured for the system
|
|
*/
|
|
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);
|
|
|
|
/* If the guest is running, disallow un-assignment of domain */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
ret = kstrtoul(buf, 0, &apqi);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (apqi > matrix_mdev->matrix.aqm_max)
|
|
return -ENODEV;
|
|
|
|
mutex_lock(&matrix_dev->lock);
|
|
clear_bit_inv((unsigned long)apqi, matrix_mdev->matrix.aqm);
|
|
mutex_unlock(&matrix_dev->lock);
|
|
|
|
return count;
|
|
}
|
|
static 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);
|
|
|
|
/* If the guest is running, disallow assignment of control domain */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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;
|
|
}
|
|
static 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;
|
|
|
|
/* If the guest is running, disallow un-assignment of control domain */
|
|
if (matrix_mdev->kvm)
|
|
return -EBUSY;
|
|
|
|
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;
|
|
}
|
|
static 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;
|
|
}
|
|
static DEVICE_ATTR_RO(control_domains);
|
|
|
|
static ssize_t matrix_show(struct device *dev, struct device_attribute *attr,
|
|
char *buf)
|
|
{
|
|
struct mdev_device *mdev = mdev_from_dev(dev);
|
|
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
|
|
char *bufpos = buf;
|
|
unsigned long apid;
|
|
unsigned long apqi;
|
|
unsigned long apid1;
|
|
unsigned long apqi1;
|
|
unsigned long napm_bits = matrix_mdev->matrix.apm_max + 1;
|
|
unsigned long naqm_bits = matrix_mdev->matrix.aqm_max + 1;
|
|
int nchars = 0;
|
|
int n;
|
|
|
|
apid1 = find_first_bit_inv(matrix_mdev->matrix.apm, napm_bits);
|
|
apqi1 = find_first_bit_inv(matrix_mdev->matrix.aqm, naqm_bits);
|
|
|
|
mutex_lock(&matrix_dev->lock);
|
|
|
|
if ((apid1 < napm_bits) && (apqi1 < naqm_bits)) {
|
|
for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
|
|
for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
|
|
naqm_bits) {
|
|
n = sprintf(bufpos, "%02lx.%04lx\n", apid,
|
|
apqi);
|
|
bufpos += n;
|
|
nchars += n;
|
|
}
|
|
}
|
|
} else if (apid1 < napm_bits) {
|
|
for_each_set_bit_inv(apid, matrix_mdev->matrix.apm, napm_bits) {
|
|
n = sprintf(bufpos, "%02lx.\n", apid);
|
|
bufpos += n;
|
|
nchars += n;
|
|
}
|
|
} else if (apqi1 < naqm_bits) {
|
|
for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm, naqm_bits) {
|
|
n = sprintf(bufpos, ".%04lx\n", apqi);
|
|
bufpos += n;
|
|
nchars += n;
|
|
}
|
|
}
|
|
|
|
mutex_unlock(&matrix_dev->lock);
|
|
|
|
return nchars;
|
|
}
|
|
static DEVICE_ATTR_RO(matrix);
|
|
|
|
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,
|
|
&dev_attr_matrix.attr,
|
|
NULL,
|
|
};
|
|
|
|
static struct attribute_group vfio_ap_mdev_attr_group = {
|
|
.attrs = vfio_ap_mdev_attrs
|
|
};
|
|
|
|
static const struct attribute_group *vfio_ap_mdev_attr_groups[] = {
|
|
&vfio_ap_mdev_attr_group,
|
|
NULL
|
|
};
|
|
|
|
/**
|
|
* vfio_ap_mdev_set_kvm
|
|
*
|
|
* @matrix_mdev: a mediated matrix device
|
|
* @kvm: reference to KVM instance
|
|
*
|
|
* Verifies no other mediated matrix device has @kvm and sets a reference to
|
|
* it in @matrix_mdev->kvm.
|
|
*
|
|
* Return 0 if no other mediated matrix device has a reference to @kvm;
|
|
* otherwise, returns an -EPERM.
|
|
*/
|
|
static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
|
|
struct kvm *kvm)
|
|
{
|
|
struct ap_matrix_mdev *m;
|
|
|
|
mutex_lock(&matrix_dev->lock);
|
|
|
|
list_for_each_entry(m, &matrix_dev->mdev_list, node) {
|
|
if ((m != matrix_mdev) && (m->kvm == kvm)) {
|
|
mutex_unlock(&matrix_dev->lock);
|
|
return -EPERM;
|
|
}
|
|
}
|
|
|
|
matrix_mdev->kvm = kvm;
|
|
mutex_unlock(&matrix_dev->lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_ap_mdev_group_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
int ret;
|
|
struct ap_matrix_mdev *matrix_mdev;
|
|
|
|
if (action != VFIO_GROUP_NOTIFY_SET_KVM)
|
|
return NOTIFY_OK;
|
|
|
|
matrix_mdev = container_of(nb, struct ap_matrix_mdev, group_notifier);
|
|
|
|
if (!data) {
|
|
matrix_mdev->kvm = NULL;
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
ret = vfio_ap_mdev_set_kvm(matrix_mdev, data);
|
|
if (ret)
|
|
return NOTIFY_DONE;
|
|
|
|
/* If there is no CRYCB pointer, then we can't copy the masks */
|
|
if (!matrix_mdev->kvm->arch.crypto.crycbd)
|
|
return NOTIFY_DONE;
|
|
|
|
kvm_arch_crypto_set_masks(matrix_mdev->kvm, matrix_mdev->matrix.apm,
|
|
matrix_mdev->matrix.aqm,
|
|
matrix_mdev->matrix.adm);
|
|
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
static int vfio_ap_mdev_reset_queue(unsigned int apid, unsigned int apqi,
|
|
unsigned int retry)
|
|
{
|
|
struct ap_queue_status status;
|
|
|
|
do {
|
|
status = ap_zapq(AP_MKQID(apid, apqi));
|
|
switch (status.response_code) {
|
|
case AP_RESPONSE_NORMAL:
|
|
return 0;
|
|
case AP_RESPONSE_RESET_IN_PROGRESS:
|
|
case AP_RESPONSE_BUSY:
|
|
msleep(20);
|
|
break;
|
|
default:
|
|
/* things are really broken, give up */
|
|
return -EIO;
|
|
}
|
|
} while (retry--);
|
|
|
|
return -EBUSY;
|
|
}
|
|
|
|
static int vfio_ap_mdev_reset_queues(struct mdev_device *mdev)
|
|
{
|
|
int ret;
|
|
int rc = 0;
|
|
unsigned long apid, apqi;
|
|
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
|
|
|
|
for_each_set_bit_inv(apid, matrix_mdev->matrix.apm,
|
|
matrix_mdev->matrix.apm_max + 1) {
|
|
for_each_set_bit_inv(apqi, matrix_mdev->matrix.aqm,
|
|
matrix_mdev->matrix.aqm_max + 1) {
|
|
ret = vfio_ap_mdev_reset_queue(apid, apqi, 1);
|
|
/*
|
|
* Regardless whether a queue turns out to be busy, or
|
|
* is not operational, we need to continue resetting
|
|
* the remaining queues.
|
|
*/
|
|
if (ret)
|
|
rc = ret;
|
|
}
|
|
}
|
|
|
|
return rc;
|
|
}
|
|
|
|
static int vfio_ap_mdev_open(struct mdev_device *mdev)
|
|
{
|
|
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
|
|
unsigned long events;
|
|
int ret;
|
|
|
|
|
|
if (!try_module_get(THIS_MODULE))
|
|
return -ENODEV;
|
|
|
|
matrix_mdev->group_notifier.notifier_call = vfio_ap_mdev_group_notifier;
|
|
events = VFIO_GROUP_NOTIFY_SET_KVM;
|
|
|
|
ret = vfio_register_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
|
|
&events, &matrix_mdev->group_notifier);
|
|
if (ret) {
|
|
module_put(THIS_MODULE);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vfio_ap_mdev_release(struct mdev_device *mdev)
|
|
{
|
|
struct ap_matrix_mdev *matrix_mdev = mdev_get_drvdata(mdev);
|
|
|
|
if (matrix_mdev->kvm)
|
|
kvm_arch_crypto_clear_masks(matrix_mdev->kvm);
|
|
|
|
vfio_ap_mdev_reset_queues(mdev);
|
|
vfio_unregister_notifier(mdev_dev(mdev), VFIO_GROUP_NOTIFY,
|
|
&matrix_mdev->group_notifier);
|
|
matrix_mdev->kvm = NULL;
|
|
module_put(THIS_MODULE);
|
|
}
|
|
|
|
static int vfio_ap_mdev_get_device_info(unsigned long arg)
|
|
{
|
|
unsigned long minsz;
|
|
struct vfio_device_info info;
|
|
|
|
minsz = offsetofend(struct vfio_device_info, num_irqs);
|
|
|
|
if (copy_from_user(&info, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if (info.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
info.flags = VFIO_DEVICE_FLAGS_AP | VFIO_DEVICE_FLAGS_RESET;
|
|
info.num_regions = 0;
|
|
info.num_irqs = 0;
|
|
|
|
return copy_to_user((void __user *)arg, &info, minsz);
|
|
}
|
|
|
|
static ssize_t vfio_ap_mdev_ioctl(struct mdev_device *mdev,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
int ret;
|
|
|
|
switch (cmd) {
|
|
case VFIO_DEVICE_GET_INFO:
|
|
ret = vfio_ap_mdev_get_device_info(arg);
|
|
break;
|
|
case VFIO_DEVICE_RESET:
|
|
ret = vfio_ap_mdev_reset_queues(mdev);
|
|
break;
|
|
default:
|
|
ret = -EOPNOTSUPP;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static const struct mdev_parent_ops vfio_ap_matrix_ops = {
|
|
.owner = THIS_MODULE,
|
|
.supported_type_groups = vfio_ap_mdev_type_groups,
|
|
.mdev_attr_groups = vfio_ap_mdev_attr_groups,
|
|
.create = vfio_ap_mdev_create,
|
|
.remove = vfio_ap_mdev_remove,
|
|
.open = vfio_ap_mdev_open,
|
|
.release = vfio_ap_mdev_release,
|
|
.ioctl = vfio_ap_mdev_ioctl,
|
|
};
|
|
|
|
int vfio_ap_mdev_register(void)
|
|
{
|
|
atomic_set(&matrix_dev->available_instances, MAX_ZDEV_ENTRIES_EXT);
|
|
|
|
return mdev_register_device(&matrix_dev->device, &vfio_ap_matrix_ops);
|
|
}
|
|
|
|
void vfio_ap_mdev_unregister(void)
|
|
{
|
|
mdev_unregister_device(&matrix_dev->device);
|
|
}
|