![Alex Williamson](/assets/img/avatar_default.png)
This VFIO IOMMU backend is designed primarily for AMD-Vi and Intel VT-d hardware, but is potentially usable by anything supporting similar mapping functionality. We arbitrarily call this a Type1 backend for lack of a better name. This backend has no IOVA or host memory mapping restrictions for the user and is optimized for relatively static mappings. Mapped areas are pinned into system memory. Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
1421 lines
34 KiB
C
1421 lines
34 KiB
C
/*
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* VFIO core
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*
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* Copyright (C) 2012 Red Hat, Inc. All rights reserved.
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* Author: Alex Williamson <alex.williamson@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Derived from original vfio:
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* Copyright 2010 Cisco Systems, Inc. All rights reserved.
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* Author: Tom Lyon, pugs@cisco.com
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*/
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#include <linux/cdev.h>
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#include <linux/compat.h>
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#include <linux/device.h>
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#include <linux/file.h>
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#include <linux/anon_inodes.h>
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#include <linux/fs.h>
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#include <linux/idr.h>
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#include <linux/iommu.h>
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#include <linux/list.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/uaccess.h>
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#include <linux/vfio.h>
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#include <linux/wait.h>
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#define DRIVER_VERSION "0.3"
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#define DRIVER_AUTHOR "Alex Williamson <alex.williamson@redhat.com>"
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#define DRIVER_DESC "VFIO - User Level meta-driver"
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static struct vfio {
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struct class *class;
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struct list_head iommu_drivers_list;
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struct mutex iommu_drivers_lock;
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struct list_head group_list;
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struct idr group_idr;
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struct mutex group_lock;
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struct cdev group_cdev;
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struct device *dev;
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dev_t devt;
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struct cdev cdev;
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wait_queue_head_t release_q;
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} vfio;
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struct vfio_iommu_driver {
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const struct vfio_iommu_driver_ops *ops;
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struct list_head vfio_next;
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};
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struct vfio_container {
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struct kref kref;
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struct list_head group_list;
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struct mutex group_lock;
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struct vfio_iommu_driver *iommu_driver;
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void *iommu_data;
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};
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struct vfio_group {
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struct kref kref;
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int minor;
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atomic_t container_users;
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struct iommu_group *iommu_group;
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struct vfio_container *container;
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struct list_head device_list;
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struct mutex device_lock;
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struct device *dev;
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struct notifier_block nb;
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struct list_head vfio_next;
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struct list_head container_next;
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};
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struct vfio_device {
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struct kref kref;
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struct device *dev;
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const struct vfio_device_ops *ops;
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struct vfio_group *group;
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struct list_head group_next;
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void *device_data;
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};
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/**
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* IOMMU driver registration
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*/
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int vfio_register_iommu_driver(const struct vfio_iommu_driver_ops *ops)
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{
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struct vfio_iommu_driver *driver, *tmp;
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driver = kzalloc(sizeof(*driver), GFP_KERNEL);
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if (!driver)
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return -ENOMEM;
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driver->ops = ops;
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mutex_lock(&vfio.iommu_drivers_lock);
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/* Check for duplicates */
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list_for_each_entry(tmp, &vfio.iommu_drivers_list, vfio_next) {
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if (tmp->ops == ops) {
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mutex_unlock(&vfio.iommu_drivers_lock);
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kfree(driver);
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return -EINVAL;
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}
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}
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list_add(&driver->vfio_next, &vfio.iommu_drivers_list);
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mutex_unlock(&vfio.iommu_drivers_lock);
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return 0;
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}
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EXPORT_SYMBOL_GPL(vfio_register_iommu_driver);
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void vfio_unregister_iommu_driver(const struct vfio_iommu_driver_ops *ops)
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{
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struct vfio_iommu_driver *driver;
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mutex_lock(&vfio.iommu_drivers_lock);
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list_for_each_entry(driver, &vfio.iommu_drivers_list, vfio_next) {
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if (driver->ops == ops) {
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list_del(&driver->vfio_next);
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mutex_unlock(&vfio.iommu_drivers_lock);
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kfree(driver);
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return;
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}
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}
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mutex_unlock(&vfio.iommu_drivers_lock);
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}
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EXPORT_SYMBOL_GPL(vfio_unregister_iommu_driver);
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/**
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* Group minor allocation/free - both called with vfio.group_lock held
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*/
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static int vfio_alloc_group_minor(struct vfio_group *group)
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{
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int ret, minor;
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again:
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if (unlikely(idr_pre_get(&vfio.group_idr, GFP_KERNEL) == 0))
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return -ENOMEM;
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/* index 0 is used by /dev/vfio/vfio */
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ret = idr_get_new_above(&vfio.group_idr, group, 1, &minor);
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if (ret == -EAGAIN)
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goto again;
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if (ret || minor > MINORMASK) {
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if (minor > MINORMASK)
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idr_remove(&vfio.group_idr, minor);
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return -ENOSPC;
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}
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return minor;
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}
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static void vfio_free_group_minor(int minor)
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{
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idr_remove(&vfio.group_idr, minor);
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}
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static int vfio_iommu_group_notifier(struct notifier_block *nb,
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unsigned long action, void *data);
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static void vfio_group_get(struct vfio_group *group);
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/**
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* Container objects - containers are created when /dev/vfio/vfio is
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* opened, but their lifecycle extends until the last user is done, so
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* it's freed via kref. Must support container/group/device being
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* closed in any order.
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*/
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static void vfio_container_get(struct vfio_container *container)
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{
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kref_get(&container->kref);
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}
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static void vfio_container_release(struct kref *kref)
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{
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struct vfio_container *container;
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container = container_of(kref, struct vfio_container, kref);
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kfree(container);
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}
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static void vfio_container_put(struct vfio_container *container)
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{
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kref_put(&container->kref, vfio_container_release);
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}
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/**
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* Group objects - create, release, get, put, search
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*/
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static struct vfio_group *vfio_create_group(struct iommu_group *iommu_group)
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{
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struct vfio_group *group, *tmp;
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struct device *dev;
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int ret, minor;
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group = kzalloc(sizeof(*group), GFP_KERNEL);
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if (!group)
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return ERR_PTR(-ENOMEM);
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kref_init(&group->kref);
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INIT_LIST_HEAD(&group->device_list);
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mutex_init(&group->device_lock);
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atomic_set(&group->container_users, 0);
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group->iommu_group = iommu_group;
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group->nb.notifier_call = vfio_iommu_group_notifier;
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/*
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* blocking notifiers acquire a rwsem around registering and hold
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* it around callback. Therefore, need to register outside of
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* vfio.group_lock to avoid A-B/B-A contention. Our callback won't
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* do anything unless it can find the group in vfio.group_list, so
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* no harm in registering early.
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*/
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ret = iommu_group_register_notifier(iommu_group, &group->nb);
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if (ret) {
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kfree(group);
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return ERR_PTR(ret);
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}
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mutex_lock(&vfio.group_lock);
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minor = vfio_alloc_group_minor(group);
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if (minor < 0) {
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mutex_unlock(&vfio.group_lock);
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kfree(group);
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return ERR_PTR(minor);
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}
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/* Did we race creating this group? */
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list_for_each_entry(tmp, &vfio.group_list, vfio_next) {
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if (tmp->iommu_group == iommu_group) {
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vfio_group_get(tmp);
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vfio_free_group_minor(minor);
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mutex_unlock(&vfio.group_lock);
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kfree(group);
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return tmp;
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}
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}
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dev = device_create(vfio.class, NULL, MKDEV(MAJOR(vfio.devt), minor),
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group, "%d", iommu_group_id(iommu_group));
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if (IS_ERR(dev)) {
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vfio_free_group_minor(minor);
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mutex_unlock(&vfio.group_lock);
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kfree(group);
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return (struct vfio_group *)dev; /* ERR_PTR */
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}
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group->minor = minor;
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group->dev = dev;
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list_add(&group->vfio_next, &vfio.group_list);
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mutex_unlock(&vfio.group_lock);
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return group;
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}
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static void vfio_group_release(struct kref *kref)
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{
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struct vfio_group *group = container_of(kref, struct vfio_group, kref);
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WARN_ON(!list_empty(&group->device_list));
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device_destroy(vfio.class, MKDEV(MAJOR(vfio.devt), group->minor));
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list_del(&group->vfio_next);
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vfio_free_group_minor(group->minor);
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mutex_unlock(&vfio.group_lock);
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/*
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* Unregister outside of lock. A spurious callback is harmless now
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* that the group is no longer in vfio.group_list.
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*/
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iommu_group_unregister_notifier(group->iommu_group, &group->nb);
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kfree(group);
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}
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static void vfio_group_put(struct vfio_group *group)
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{
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mutex_lock(&vfio.group_lock);
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/*
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* Release needs to unlock to unregister the notifier, so only
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* unlock if not released.
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*/
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if (!kref_put(&group->kref, vfio_group_release))
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mutex_unlock(&vfio.group_lock);
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}
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/* Assume group_lock or group reference is held */
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static void vfio_group_get(struct vfio_group *group)
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{
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kref_get(&group->kref);
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}
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/*
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* Not really a try as we will sleep for mutex, but we need to make
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* sure the group pointer is valid under lock and get a reference.
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*/
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static struct vfio_group *vfio_group_try_get(struct vfio_group *group)
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{
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struct vfio_group *target = group;
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mutex_lock(&vfio.group_lock);
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list_for_each_entry(group, &vfio.group_list, vfio_next) {
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if (group == target) {
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vfio_group_get(group);
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mutex_unlock(&vfio.group_lock);
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return group;
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}
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}
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mutex_unlock(&vfio.group_lock);
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return NULL;
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}
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static
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struct vfio_group *vfio_group_get_from_iommu(struct iommu_group *iommu_group)
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{
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struct vfio_group *group;
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mutex_lock(&vfio.group_lock);
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list_for_each_entry(group, &vfio.group_list, vfio_next) {
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if (group->iommu_group == iommu_group) {
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vfio_group_get(group);
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mutex_unlock(&vfio.group_lock);
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return group;
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}
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}
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mutex_unlock(&vfio.group_lock);
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return NULL;
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}
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static struct vfio_group *vfio_group_get_from_minor(int minor)
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{
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struct vfio_group *group;
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mutex_lock(&vfio.group_lock);
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group = idr_find(&vfio.group_idr, minor);
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if (!group) {
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mutex_unlock(&vfio.group_lock);
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return NULL;
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}
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vfio_group_get(group);
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mutex_unlock(&vfio.group_lock);
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return group;
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}
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/**
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* Device objects - create, release, get, put, search
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*/
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static
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struct vfio_device *vfio_group_create_device(struct vfio_group *group,
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struct device *dev,
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const struct vfio_device_ops *ops,
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void *device_data)
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{
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struct vfio_device *device;
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int ret;
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device = kzalloc(sizeof(*device), GFP_KERNEL);
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if (!device)
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return ERR_PTR(-ENOMEM);
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kref_init(&device->kref);
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device->dev = dev;
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device->group = group;
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device->ops = ops;
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device->device_data = device_data;
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ret = dev_set_drvdata(dev, device);
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if (ret) {
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kfree(device);
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return ERR_PTR(ret);
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}
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/* No need to get group_lock, caller has group reference */
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vfio_group_get(group);
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mutex_lock(&group->device_lock);
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list_add(&device->group_next, &group->device_list);
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mutex_unlock(&group->device_lock);
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return device;
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}
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static void vfio_device_release(struct kref *kref)
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{
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struct vfio_device *device = container_of(kref,
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struct vfio_device, kref);
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struct vfio_group *group = device->group;
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mutex_lock(&group->device_lock);
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list_del(&device->group_next);
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mutex_unlock(&group->device_lock);
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dev_set_drvdata(device->dev, NULL);
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kfree(device);
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/* vfio_del_group_dev may be waiting for this device */
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wake_up(&vfio.release_q);
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}
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/* Device reference always implies a group reference */
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static void vfio_device_put(struct vfio_device *device)
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{
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kref_put(&device->kref, vfio_device_release);
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vfio_group_put(device->group);
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}
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static void vfio_device_get(struct vfio_device *device)
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{
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vfio_group_get(device->group);
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kref_get(&device->kref);
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}
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static struct vfio_device *vfio_group_get_device(struct vfio_group *group,
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struct device *dev)
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{
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struct vfio_device *device;
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mutex_lock(&group->device_lock);
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list_for_each_entry(device, &group->device_list, group_next) {
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if (device->dev == dev) {
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vfio_device_get(device);
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mutex_unlock(&group->device_lock);
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return device;
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}
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}
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mutex_unlock(&group->device_lock);
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return NULL;
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}
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/*
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* Whitelist some drivers that we know are safe (no dma) or just sit on
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* a device. It's not always practical to leave a device within a group
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* driverless as it could get re-bound to something unsafe.
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*/
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static const char * const vfio_driver_whitelist[] = { "pci-stub" };
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static bool vfio_whitelisted_driver(struct device_driver *drv)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(vfio_driver_whitelist); i++) {
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if (!strcmp(drv->name, vfio_driver_whitelist[i]))
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return true;
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}
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return false;
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}
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/*
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* A vfio group is viable for use by userspace if all devices are either
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* driver-less or bound to a vfio or whitelisted driver. We test the
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* latter by the existence of a struct vfio_device matching the dev.
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*/
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static int vfio_dev_viable(struct device *dev, void *data)
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{
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struct vfio_group *group = data;
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struct vfio_device *device;
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if (!dev->driver || vfio_whitelisted_driver(dev->driver))
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return 0;
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device = vfio_group_get_device(group, dev);
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if (device) {
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vfio_device_put(device);
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return 0;
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}
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return -EINVAL;
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}
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/**
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* Async device support
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*/
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static int vfio_group_nb_add_dev(struct vfio_group *group, struct device *dev)
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{
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struct vfio_device *device;
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/* Do we already know about it? We shouldn't */
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device = vfio_group_get_device(group, dev);
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if (WARN_ON_ONCE(device)) {
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vfio_device_put(device);
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return 0;
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}
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/* Nothing to do for idle groups */
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if (!atomic_read(&group->container_users))
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return 0;
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/* TODO Prevent device auto probing */
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WARN("Device %s added to live group %d!\n", dev_name(dev),
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iommu_group_id(group->iommu_group));
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return 0;
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}
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static int vfio_group_nb_del_dev(struct vfio_group *group, struct device *dev)
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{
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struct vfio_device *device;
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/*
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* Expect to fall out here. If a device was in use, it would
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* have been bound to a vfio sub-driver, which would have blocked
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* in .remove at vfio_del_group_dev. Sanity check that we no
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* longer track the device, so it's safe to remove.
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*/
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device = vfio_group_get_device(group, dev);
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if (likely(!device))
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return 0;
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WARN("Device %s removed from live group %d!\n", dev_name(dev),
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iommu_group_id(group->iommu_group));
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|
|
vfio_device_put(device);
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_group_nb_verify(struct vfio_group *group, struct device *dev)
|
|
{
|
|
/* We don't care what happens when the group isn't in use */
|
|
if (!atomic_read(&group->container_users))
|
|
return 0;
|
|
|
|
return vfio_dev_viable(dev, group);
|
|
}
|
|
|
|
static int vfio_iommu_group_notifier(struct notifier_block *nb,
|
|
unsigned long action, void *data)
|
|
{
|
|
struct vfio_group *group = container_of(nb, struct vfio_group, nb);
|
|
struct device *dev = data;
|
|
|
|
/*
|
|
* Need to go through a group_lock lookup to get a reference or
|
|
* we risk racing a group being removed. Leave a WARN_ON for
|
|
* debuging, but if the group no longer exists, a spurious notify
|
|
* is harmless.
|
|
*/
|
|
group = vfio_group_try_get(group);
|
|
if (WARN_ON(!group))
|
|
return NOTIFY_OK;
|
|
|
|
switch (action) {
|
|
case IOMMU_GROUP_NOTIFY_ADD_DEVICE:
|
|
vfio_group_nb_add_dev(group, dev);
|
|
break;
|
|
case IOMMU_GROUP_NOTIFY_DEL_DEVICE:
|
|
vfio_group_nb_del_dev(group, dev);
|
|
break;
|
|
case IOMMU_GROUP_NOTIFY_BIND_DRIVER:
|
|
pr_debug("%s: Device %s, group %d binding to driver\n",
|
|
__func__, dev_name(dev),
|
|
iommu_group_id(group->iommu_group));
|
|
break;
|
|
case IOMMU_GROUP_NOTIFY_BOUND_DRIVER:
|
|
pr_debug("%s: Device %s, group %d bound to driver %s\n",
|
|
__func__, dev_name(dev),
|
|
iommu_group_id(group->iommu_group), dev->driver->name);
|
|
BUG_ON(vfio_group_nb_verify(group, dev));
|
|
break;
|
|
case IOMMU_GROUP_NOTIFY_UNBIND_DRIVER:
|
|
pr_debug("%s: Device %s, group %d unbinding from driver %s\n",
|
|
__func__, dev_name(dev),
|
|
iommu_group_id(group->iommu_group), dev->driver->name);
|
|
break;
|
|
case IOMMU_GROUP_NOTIFY_UNBOUND_DRIVER:
|
|
pr_debug("%s: Device %s, group %d unbound from driver\n",
|
|
__func__, dev_name(dev),
|
|
iommu_group_id(group->iommu_group));
|
|
/*
|
|
* XXX An unbound device in a live group is ok, but we'd
|
|
* really like to avoid the above BUG_ON by preventing other
|
|
* drivers from binding to it. Once that occurs, we have to
|
|
* stop the system to maintain isolation. At a minimum, we'd
|
|
* want a toggle to disable driver auto probe for this device.
|
|
*/
|
|
break;
|
|
}
|
|
|
|
vfio_group_put(group);
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/**
|
|
* VFIO driver API
|
|
*/
|
|
int vfio_add_group_dev(struct device *dev,
|
|
const struct vfio_device_ops *ops, void *device_data)
|
|
{
|
|
struct iommu_group *iommu_group;
|
|
struct vfio_group *group;
|
|
struct vfio_device *device;
|
|
|
|
iommu_group = iommu_group_get(dev);
|
|
if (!iommu_group)
|
|
return -EINVAL;
|
|
|
|
group = vfio_group_get_from_iommu(iommu_group);
|
|
if (!group) {
|
|
group = vfio_create_group(iommu_group);
|
|
if (IS_ERR(group)) {
|
|
iommu_group_put(iommu_group);
|
|
return PTR_ERR(group);
|
|
}
|
|
}
|
|
|
|
device = vfio_group_get_device(group, dev);
|
|
if (device) {
|
|
WARN(1, "Device %s already exists on group %d\n",
|
|
dev_name(dev), iommu_group_id(iommu_group));
|
|
vfio_device_put(device);
|
|
vfio_group_put(group);
|
|
iommu_group_put(iommu_group);
|
|
return -EBUSY;
|
|
}
|
|
|
|
device = vfio_group_create_device(group, dev, ops, device_data);
|
|
if (IS_ERR(device)) {
|
|
vfio_group_put(group);
|
|
iommu_group_put(iommu_group);
|
|
return PTR_ERR(device);
|
|
}
|
|
|
|
/*
|
|
* Added device holds reference to iommu_group and vfio_device
|
|
* (which in turn holds reference to vfio_group). Drop extra
|
|
* group reference used while acquiring device.
|
|
*/
|
|
vfio_group_put(group);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_add_group_dev);
|
|
|
|
/* Test whether a struct device is present in our tracking */
|
|
static bool vfio_dev_present(struct device *dev)
|
|
{
|
|
struct iommu_group *iommu_group;
|
|
struct vfio_group *group;
|
|
struct vfio_device *device;
|
|
|
|
iommu_group = iommu_group_get(dev);
|
|
if (!iommu_group)
|
|
return false;
|
|
|
|
group = vfio_group_get_from_iommu(iommu_group);
|
|
if (!group) {
|
|
iommu_group_put(iommu_group);
|
|
return false;
|
|
}
|
|
|
|
device = vfio_group_get_device(group, dev);
|
|
if (!device) {
|
|
vfio_group_put(group);
|
|
iommu_group_put(iommu_group);
|
|
return false;
|
|
}
|
|
|
|
vfio_device_put(device);
|
|
vfio_group_put(group);
|
|
iommu_group_put(iommu_group);
|
|
return true;
|
|
}
|
|
|
|
/*
|
|
* Decrement the device reference count and wait for the device to be
|
|
* removed. Open file descriptors for the device... */
|
|
void *vfio_del_group_dev(struct device *dev)
|
|
{
|
|
struct vfio_device *device = dev_get_drvdata(dev);
|
|
struct vfio_group *group = device->group;
|
|
struct iommu_group *iommu_group = group->iommu_group;
|
|
void *device_data = device->device_data;
|
|
|
|
vfio_device_put(device);
|
|
|
|
/* TODO send a signal to encourage this to be released */
|
|
wait_event(vfio.release_q, !vfio_dev_present(dev));
|
|
|
|
iommu_group_put(iommu_group);
|
|
|
|
return device_data;
|
|
}
|
|
EXPORT_SYMBOL_GPL(vfio_del_group_dev);
|
|
|
|
/**
|
|
* VFIO base fd, /dev/vfio/vfio
|
|
*/
|
|
static long vfio_ioctl_check_extension(struct vfio_container *container,
|
|
unsigned long arg)
|
|
{
|
|
struct vfio_iommu_driver *driver = container->iommu_driver;
|
|
long ret = 0;
|
|
|
|
switch (arg) {
|
|
/* No base extensions yet */
|
|
default:
|
|
/*
|
|
* If no driver is set, poll all registered drivers for
|
|
* extensions and return the first positive result. If
|
|
* a driver is already set, further queries will be passed
|
|
* only to that driver.
|
|
*/
|
|
if (!driver) {
|
|
mutex_lock(&vfio.iommu_drivers_lock);
|
|
list_for_each_entry(driver, &vfio.iommu_drivers_list,
|
|
vfio_next) {
|
|
if (!try_module_get(driver->ops->owner))
|
|
continue;
|
|
|
|
ret = driver->ops->ioctl(NULL,
|
|
VFIO_CHECK_EXTENSION,
|
|
arg);
|
|
module_put(driver->ops->owner);
|
|
if (ret > 0)
|
|
break;
|
|
}
|
|
mutex_unlock(&vfio.iommu_drivers_lock);
|
|
} else
|
|
ret = driver->ops->ioctl(container->iommu_data,
|
|
VFIO_CHECK_EXTENSION, arg);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* hold container->group_lock */
|
|
static int __vfio_container_attach_groups(struct vfio_container *container,
|
|
struct vfio_iommu_driver *driver,
|
|
void *data)
|
|
{
|
|
struct vfio_group *group;
|
|
int ret = -ENODEV;
|
|
|
|
list_for_each_entry(group, &container->group_list, container_next) {
|
|
ret = driver->ops->attach_group(data, group->iommu_group);
|
|
if (ret)
|
|
goto unwind;
|
|
}
|
|
|
|
return ret;
|
|
|
|
unwind:
|
|
list_for_each_entry_continue_reverse(group, &container->group_list,
|
|
container_next) {
|
|
driver->ops->detach_group(data, group->iommu_group);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long vfio_ioctl_set_iommu(struct vfio_container *container,
|
|
unsigned long arg)
|
|
{
|
|
struct vfio_iommu_driver *driver;
|
|
long ret = -ENODEV;
|
|
|
|
mutex_lock(&container->group_lock);
|
|
|
|
/*
|
|
* The container is designed to be an unprivileged interface while
|
|
* the group can be assigned to specific users. Therefore, only by
|
|
* adding a group to a container does the user get the privilege of
|
|
* enabling the iommu, which may allocate finite resources. There
|
|
* is no unset_iommu, but by removing all the groups from a container,
|
|
* the container is deprivileged and returns to an unset state.
|
|
*/
|
|
if (list_empty(&container->group_list) || container->iommu_driver) {
|
|
mutex_unlock(&container->group_lock);
|
|
return -EINVAL;
|
|
}
|
|
|
|
mutex_lock(&vfio.iommu_drivers_lock);
|
|
list_for_each_entry(driver, &vfio.iommu_drivers_list, vfio_next) {
|
|
void *data;
|
|
|
|
if (!try_module_get(driver->ops->owner))
|
|
continue;
|
|
|
|
/*
|
|
* The arg magic for SET_IOMMU is the same as CHECK_EXTENSION,
|
|
* so test which iommu driver reported support for this
|
|
* extension and call open on them. We also pass them the
|
|
* magic, allowing a single driver to support multiple
|
|
* interfaces if they'd like.
|
|
*/
|
|
if (driver->ops->ioctl(NULL, VFIO_CHECK_EXTENSION, arg) <= 0) {
|
|
module_put(driver->ops->owner);
|
|
continue;
|
|
}
|
|
|
|
/* module reference holds the driver we're working on */
|
|
mutex_unlock(&vfio.iommu_drivers_lock);
|
|
|
|
data = driver->ops->open(arg);
|
|
if (IS_ERR(data)) {
|
|
ret = PTR_ERR(data);
|
|
module_put(driver->ops->owner);
|
|
goto skip_drivers_unlock;
|
|
}
|
|
|
|
ret = __vfio_container_attach_groups(container, driver, data);
|
|
if (!ret) {
|
|
container->iommu_driver = driver;
|
|
container->iommu_data = data;
|
|
} else {
|
|
driver->ops->release(data);
|
|
module_put(driver->ops->owner);
|
|
}
|
|
|
|
goto skip_drivers_unlock;
|
|
}
|
|
|
|
mutex_unlock(&vfio.iommu_drivers_lock);
|
|
skip_drivers_unlock:
|
|
mutex_unlock(&container->group_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long vfio_fops_unl_ioctl(struct file *filep,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct vfio_container *container = filep->private_data;
|
|
struct vfio_iommu_driver *driver;
|
|
void *data;
|
|
long ret = -EINVAL;
|
|
|
|
if (!container)
|
|
return ret;
|
|
|
|
driver = container->iommu_driver;
|
|
data = container->iommu_data;
|
|
|
|
switch (cmd) {
|
|
case VFIO_GET_API_VERSION:
|
|
ret = VFIO_API_VERSION;
|
|
break;
|
|
case VFIO_CHECK_EXTENSION:
|
|
ret = vfio_ioctl_check_extension(container, arg);
|
|
break;
|
|
case VFIO_SET_IOMMU:
|
|
ret = vfio_ioctl_set_iommu(container, arg);
|
|
break;
|
|
default:
|
|
if (driver) /* passthrough all unrecognized ioctls */
|
|
ret = driver->ops->ioctl(data, cmd, arg);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long vfio_fops_compat_ioctl(struct file *filep,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
arg = (unsigned long)compat_ptr(arg);
|
|
return vfio_fops_unl_ioctl(filep, cmd, arg);
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static int vfio_fops_open(struct inode *inode, struct file *filep)
|
|
{
|
|
struct vfio_container *container;
|
|
|
|
container = kzalloc(sizeof(*container), GFP_KERNEL);
|
|
if (!container)
|
|
return -ENOMEM;
|
|
|
|
INIT_LIST_HEAD(&container->group_list);
|
|
mutex_init(&container->group_lock);
|
|
kref_init(&container->kref);
|
|
|
|
filep->private_data = container;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_fops_release(struct inode *inode, struct file *filep)
|
|
{
|
|
struct vfio_container *container = filep->private_data;
|
|
|
|
filep->private_data = NULL;
|
|
|
|
vfio_container_put(container);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Once an iommu driver is set, we optionally pass read/write/mmap
|
|
* on to the driver, allowing management interfaces beyond ioctl.
|
|
*/
|
|
static ssize_t vfio_fops_read(struct file *filep, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct vfio_container *container = filep->private_data;
|
|
struct vfio_iommu_driver *driver = container->iommu_driver;
|
|
|
|
if (unlikely(!driver || !driver->ops->read))
|
|
return -EINVAL;
|
|
|
|
return driver->ops->read(container->iommu_data, buf, count, ppos);
|
|
}
|
|
|
|
static ssize_t vfio_fops_write(struct file *filep, const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct vfio_container *container = filep->private_data;
|
|
struct vfio_iommu_driver *driver = container->iommu_driver;
|
|
|
|
if (unlikely(!driver || !driver->ops->write))
|
|
return -EINVAL;
|
|
|
|
return driver->ops->write(container->iommu_data, buf, count, ppos);
|
|
}
|
|
|
|
static int vfio_fops_mmap(struct file *filep, struct vm_area_struct *vma)
|
|
{
|
|
struct vfio_container *container = filep->private_data;
|
|
struct vfio_iommu_driver *driver = container->iommu_driver;
|
|
|
|
if (unlikely(!driver || !driver->ops->mmap))
|
|
return -EINVAL;
|
|
|
|
return driver->ops->mmap(container->iommu_data, vma);
|
|
}
|
|
|
|
static const struct file_operations vfio_fops = {
|
|
.owner = THIS_MODULE,
|
|
.open = vfio_fops_open,
|
|
.release = vfio_fops_release,
|
|
.read = vfio_fops_read,
|
|
.write = vfio_fops_write,
|
|
.unlocked_ioctl = vfio_fops_unl_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = vfio_fops_compat_ioctl,
|
|
#endif
|
|
.mmap = vfio_fops_mmap,
|
|
};
|
|
|
|
/**
|
|
* VFIO Group fd, /dev/vfio/$GROUP
|
|
*/
|
|
static void __vfio_group_unset_container(struct vfio_group *group)
|
|
{
|
|
struct vfio_container *container = group->container;
|
|
struct vfio_iommu_driver *driver;
|
|
|
|
mutex_lock(&container->group_lock);
|
|
|
|
driver = container->iommu_driver;
|
|
if (driver)
|
|
driver->ops->detach_group(container->iommu_data,
|
|
group->iommu_group);
|
|
|
|
group->container = NULL;
|
|
list_del(&group->container_next);
|
|
|
|
/* Detaching the last group deprivileges a container, remove iommu */
|
|
if (driver && list_empty(&container->group_list)) {
|
|
driver->ops->release(container->iommu_data);
|
|
module_put(driver->ops->owner);
|
|
container->iommu_driver = NULL;
|
|
container->iommu_data = NULL;
|
|
}
|
|
|
|
mutex_unlock(&container->group_lock);
|
|
|
|
vfio_container_put(container);
|
|
}
|
|
|
|
/*
|
|
* VFIO_GROUP_UNSET_CONTAINER should fail if there are other users or
|
|
* if there was no container to unset. Since the ioctl is called on
|
|
* the group, we know that still exists, therefore the only valid
|
|
* transition here is 1->0.
|
|
*/
|
|
static int vfio_group_unset_container(struct vfio_group *group)
|
|
{
|
|
int users = atomic_cmpxchg(&group->container_users, 1, 0);
|
|
|
|
if (!users)
|
|
return -EINVAL;
|
|
if (users != 1)
|
|
return -EBUSY;
|
|
|
|
__vfio_group_unset_container(group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* When removing container users, anything that removes the last user
|
|
* implicitly removes the group from the container. That is, if the
|
|
* group file descriptor is closed, as well as any device file descriptors,
|
|
* the group is free.
|
|
*/
|
|
static void vfio_group_try_dissolve_container(struct vfio_group *group)
|
|
{
|
|
if (0 == atomic_dec_if_positive(&group->container_users))
|
|
__vfio_group_unset_container(group);
|
|
}
|
|
|
|
static int vfio_group_set_container(struct vfio_group *group, int container_fd)
|
|
{
|
|
struct file *filep;
|
|
struct vfio_container *container;
|
|
struct vfio_iommu_driver *driver;
|
|
int ret = 0;
|
|
|
|
if (atomic_read(&group->container_users))
|
|
return -EINVAL;
|
|
|
|
filep = fget(container_fd);
|
|
if (!filep)
|
|
return -EBADF;
|
|
|
|
/* Sanity check, is this really our fd? */
|
|
if (filep->f_op != &vfio_fops) {
|
|
fput(filep);
|
|
return -EINVAL;
|
|
}
|
|
|
|
container = filep->private_data;
|
|
WARN_ON(!container); /* fget ensures we don't race vfio_release */
|
|
|
|
mutex_lock(&container->group_lock);
|
|
|
|
driver = container->iommu_driver;
|
|
if (driver) {
|
|
ret = driver->ops->attach_group(container->iommu_data,
|
|
group->iommu_group);
|
|
if (ret)
|
|
goto unlock_out;
|
|
}
|
|
|
|
group->container = container;
|
|
list_add(&group->container_next, &container->group_list);
|
|
|
|
/* Get a reference on the container and mark a user within the group */
|
|
vfio_container_get(container);
|
|
atomic_inc(&group->container_users);
|
|
|
|
unlock_out:
|
|
mutex_unlock(&container->group_lock);
|
|
fput(filep);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static bool vfio_group_viable(struct vfio_group *group)
|
|
{
|
|
return (iommu_group_for_each_dev(group->iommu_group,
|
|
group, vfio_dev_viable) == 0);
|
|
}
|
|
|
|
static const struct file_operations vfio_device_fops;
|
|
|
|
static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
|
|
{
|
|
struct vfio_device *device;
|
|
struct file *filep;
|
|
int ret = -ENODEV;
|
|
|
|
if (0 == atomic_read(&group->container_users) ||
|
|
!group->container->iommu_driver || !vfio_group_viable(group))
|
|
return -EINVAL;
|
|
|
|
mutex_lock(&group->device_lock);
|
|
list_for_each_entry(device, &group->device_list, group_next) {
|
|
if (strcmp(dev_name(device->dev), buf))
|
|
continue;
|
|
|
|
ret = device->ops->open(device->device_data);
|
|
if (ret)
|
|
break;
|
|
/*
|
|
* We can't use anon_inode_getfd() because we need to modify
|
|
* the f_mode flags directly to allow more than just ioctls
|
|
*/
|
|
ret = get_unused_fd();
|
|
if (ret < 0) {
|
|
device->ops->release(device->device_data);
|
|
break;
|
|
}
|
|
|
|
filep = anon_inode_getfile("[vfio-device]", &vfio_device_fops,
|
|
device, O_RDWR);
|
|
if (IS_ERR(filep)) {
|
|
put_unused_fd(ret);
|
|
ret = PTR_ERR(filep);
|
|
device->ops->release(device->device_data);
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* TODO: add an anon_inode interface to do this.
|
|
* Appears to be missing by lack of need rather than
|
|
* explicitly prevented. Now there's need.
|
|
*/
|
|
filep->f_mode |= (FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
|
|
|
|
fd_install(ret, filep);
|
|
|
|
vfio_device_get(device);
|
|
atomic_inc(&group->container_users);
|
|
break;
|
|
}
|
|
mutex_unlock(&group->device_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static long vfio_group_fops_unl_ioctl(struct file *filep,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct vfio_group *group = filep->private_data;
|
|
long ret = -ENOTTY;
|
|
|
|
switch (cmd) {
|
|
case VFIO_GROUP_GET_STATUS:
|
|
{
|
|
struct vfio_group_status status;
|
|
unsigned long minsz;
|
|
|
|
minsz = offsetofend(struct vfio_group_status, flags);
|
|
|
|
if (copy_from_user(&status, (void __user *)arg, minsz))
|
|
return -EFAULT;
|
|
|
|
if (status.argsz < minsz)
|
|
return -EINVAL;
|
|
|
|
status.flags = 0;
|
|
|
|
if (vfio_group_viable(group))
|
|
status.flags |= VFIO_GROUP_FLAGS_VIABLE;
|
|
|
|
if (group->container)
|
|
status.flags |= VFIO_GROUP_FLAGS_CONTAINER_SET;
|
|
|
|
if (copy_to_user((void __user *)arg, &status, minsz))
|
|
return -EFAULT;
|
|
|
|
ret = 0;
|
|
break;
|
|
}
|
|
case VFIO_GROUP_SET_CONTAINER:
|
|
{
|
|
int fd;
|
|
|
|
if (get_user(fd, (int __user *)arg))
|
|
return -EFAULT;
|
|
|
|
if (fd < 0)
|
|
return -EINVAL;
|
|
|
|
ret = vfio_group_set_container(group, fd);
|
|
break;
|
|
}
|
|
case VFIO_GROUP_UNSET_CONTAINER:
|
|
ret = vfio_group_unset_container(group);
|
|
break;
|
|
case VFIO_GROUP_GET_DEVICE_FD:
|
|
{
|
|
char *buf;
|
|
|
|
buf = strndup_user((const char __user *)arg, PAGE_SIZE);
|
|
if (IS_ERR(buf))
|
|
return PTR_ERR(buf);
|
|
|
|
ret = vfio_group_get_device_fd(group, buf);
|
|
kfree(buf);
|
|
break;
|
|
}
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long vfio_group_fops_compat_ioctl(struct file *filep,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
arg = (unsigned long)compat_ptr(arg);
|
|
return vfio_group_fops_unl_ioctl(filep, cmd, arg);
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static int vfio_group_fops_open(struct inode *inode, struct file *filep)
|
|
{
|
|
struct vfio_group *group;
|
|
|
|
group = vfio_group_get_from_minor(iminor(inode));
|
|
if (!group)
|
|
return -ENODEV;
|
|
|
|
if (group->container) {
|
|
vfio_group_put(group);
|
|
return -EBUSY;
|
|
}
|
|
|
|
filep->private_data = group;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vfio_group_fops_release(struct inode *inode, struct file *filep)
|
|
{
|
|
struct vfio_group *group = filep->private_data;
|
|
|
|
filep->private_data = NULL;
|
|
|
|
vfio_group_try_dissolve_container(group);
|
|
|
|
vfio_group_put(group);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations vfio_group_fops = {
|
|
.owner = THIS_MODULE,
|
|
.unlocked_ioctl = vfio_group_fops_unl_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = vfio_group_fops_compat_ioctl,
|
|
#endif
|
|
.open = vfio_group_fops_open,
|
|
.release = vfio_group_fops_release,
|
|
};
|
|
|
|
/**
|
|
* VFIO Device fd
|
|
*/
|
|
static int vfio_device_fops_release(struct inode *inode, struct file *filep)
|
|
{
|
|
struct vfio_device *device = filep->private_data;
|
|
|
|
device->ops->release(device->device_data);
|
|
|
|
vfio_group_try_dissolve_container(device->group);
|
|
|
|
vfio_device_put(device);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static long vfio_device_fops_unl_ioctl(struct file *filep,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
struct vfio_device *device = filep->private_data;
|
|
|
|
if (unlikely(!device->ops->ioctl))
|
|
return -EINVAL;
|
|
|
|
return device->ops->ioctl(device->device_data, cmd, arg);
|
|
}
|
|
|
|
static ssize_t vfio_device_fops_read(struct file *filep, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct vfio_device *device = filep->private_data;
|
|
|
|
if (unlikely(!device->ops->read))
|
|
return -EINVAL;
|
|
|
|
return device->ops->read(device->device_data, buf, count, ppos);
|
|
}
|
|
|
|
static ssize_t vfio_device_fops_write(struct file *filep,
|
|
const char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
struct vfio_device *device = filep->private_data;
|
|
|
|
if (unlikely(!device->ops->write))
|
|
return -EINVAL;
|
|
|
|
return device->ops->write(device->device_data, buf, count, ppos);
|
|
}
|
|
|
|
static int vfio_device_fops_mmap(struct file *filep, struct vm_area_struct *vma)
|
|
{
|
|
struct vfio_device *device = filep->private_data;
|
|
|
|
if (unlikely(!device->ops->mmap))
|
|
return -EINVAL;
|
|
|
|
return device->ops->mmap(device->device_data, vma);
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
static long vfio_device_fops_compat_ioctl(struct file *filep,
|
|
unsigned int cmd, unsigned long arg)
|
|
{
|
|
arg = (unsigned long)compat_ptr(arg);
|
|
return vfio_device_fops_unl_ioctl(filep, cmd, arg);
|
|
}
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
static const struct file_operations vfio_device_fops = {
|
|
.owner = THIS_MODULE,
|
|
.release = vfio_device_fops_release,
|
|
.read = vfio_device_fops_read,
|
|
.write = vfio_device_fops_write,
|
|
.unlocked_ioctl = vfio_device_fops_unl_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = vfio_device_fops_compat_ioctl,
|
|
#endif
|
|
.mmap = vfio_device_fops_mmap,
|
|
};
|
|
|
|
/**
|
|
* Module/class support
|
|
*/
|
|
static char *vfio_devnode(struct device *dev, umode_t *mode)
|
|
{
|
|
return kasprintf(GFP_KERNEL, "vfio/%s", dev_name(dev));
|
|
}
|
|
|
|
static int __init vfio_init(void)
|
|
{
|
|
int ret;
|
|
|
|
idr_init(&vfio.group_idr);
|
|
mutex_init(&vfio.group_lock);
|
|
mutex_init(&vfio.iommu_drivers_lock);
|
|
INIT_LIST_HEAD(&vfio.group_list);
|
|
INIT_LIST_HEAD(&vfio.iommu_drivers_list);
|
|
init_waitqueue_head(&vfio.release_q);
|
|
|
|
vfio.class = class_create(THIS_MODULE, "vfio");
|
|
if (IS_ERR(vfio.class)) {
|
|
ret = PTR_ERR(vfio.class);
|
|
goto err_class;
|
|
}
|
|
|
|
vfio.class->devnode = vfio_devnode;
|
|
|
|
ret = alloc_chrdev_region(&vfio.devt, 0, MINORMASK, "vfio");
|
|
if (ret)
|
|
goto err_base_chrdev;
|
|
|
|
cdev_init(&vfio.cdev, &vfio_fops);
|
|
ret = cdev_add(&vfio.cdev, vfio.devt, 1);
|
|
if (ret)
|
|
goto err_base_cdev;
|
|
|
|
vfio.dev = device_create(vfio.class, NULL, vfio.devt, NULL, "vfio");
|
|
if (IS_ERR(vfio.dev)) {
|
|
ret = PTR_ERR(vfio.dev);
|
|
goto err_base_dev;
|
|
}
|
|
|
|
/* /dev/vfio/$GROUP */
|
|
cdev_init(&vfio.group_cdev, &vfio_group_fops);
|
|
ret = cdev_add(&vfio.group_cdev,
|
|
MKDEV(MAJOR(vfio.devt), 1), MINORMASK - 1);
|
|
if (ret)
|
|
goto err_groups_cdev;
|
|
|
|
pr_info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
|
|
|
|
/*
|
|
* Attempt to load known iommu-drivers. This gives us a working
|
|
* environment without the user needing to explicitly load iommu
|
|
* drivers.
|
|
*/
|
|
request_module_nowait("vfio_iommu_type1");
|
|
|
|
return 0;
|
|
|
|
err_groups_cdev:
|
|
device_destroy(vfio.class, vfio.devt);
|
|
err_base_dev:
|
|
cdev_del(&vfio.cdev);
|
|
err_base_cdev:
|
|
unregister_chrdev_region(vfio.devt, MINORMASK);
|
|
err_base_chrdev:
|
|
class_destroy(vfio.class);
|
|
vfio.class = NULL;
|
|
err_class:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit vfio_cleanup(void)
|
|
{
|
|
WARN_ON(!list_empty(&vfio.group_list));
|
|
|
|
idr_destroy(&vfio.group_idr);
|
|
cdev_del(&vfio.group_cdev);
|
|
device_destroy(vfio.class, vfio.devt);
|
|
cdev_del(&vfio.cdev);
|
|
unregister_chrdev_region(vfio.devt, MINORMASK);
|
|
class_destroy(vfio.class);
|
|
vfio.class = NULL;
|
|
}
|
|
|
|
module_init(vfio_init);
|
|
module_exit(vfio_cleanup);
|
|
|
|
MODULE_VERSION(DRIVER_VERSION);
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_AUTHOR(DRIVER_AUTHOR);
|
|
MODULE_DESCRIPTION(DRIVER_DESC);
|