diff mbox series

[v3,7/7] vfio: Remove calls to vfio_group_add_container_user()

Message ID 7-v3-e131a9b6b467+14b6-vfio_mdev_no_group_jgg@nvidia.com (mailing list archive)
State New, archived
Headers show
Series Make the rest of the VFIO driver interface use vfio_device | expand

Commit Message

Jason Gunthorpe May 2, 2022, 5:31 p.m. UTC 
When the open_device() op is called the container_users is incremented and
held incremented until close_device(). Thus, so long as drivers call
functions within their open_device()/close_device() region they do not
need to worry about the container_users.

These functions can all only be called between open_device() and
close_device():

  vfio_pin_pages()
  vfio_unpin_pages()
  vfio_dma_rw()
  vfio_register_notifier()
  vfio_unregister_notifier()

Eliminate the calls to vfio_group_add_container_user() and add
vfio_assert_device_open() to detect driver mis-use. This causes the
close_device() op to check device->open_count so always leave it elevated
while calling the op.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/vfio/vfio.c | 78 +++++++++------------------------------------
 1 file changed, 15 insertions(+), 63 deletions(-)
diff mbox series

Patch

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 0184d760ec1e44..f7d1898129ad1c 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1115,6 +1115,12 @@  static int vfio_group_add_container_user(struct vfio_group *group)
 
 static const struct file_operations vfio_device_fops;
 
+/* true if the vfio_device has open_device() called but not close_device() */
+static bool vfio_assert_device_open(struct vfio_device *device)
+{
+	return !WARN_ON_ONCE(!READ_ONCE(device->open_count));
+}
+
 static int vfio_group_get_device_fd(struct vfio_group *group, char *buf)
 {
 	struct vfio_device *device;
@@ -1329,8 +1335,10 @@  static int vfio_device_fops_release(struct inode *inode, struct file *filep)
 	struct vfio_device *device = filep->private_data;
 
 	mutex_lock(&device->dev_set->lock);
-	if (!--device->open_count && device->ops->close_device)
+	vfio_assert_device_open(device);
+	if (device->open_count == 1 && device->ops->close_device)
 		device->ops->close_device(device);
+	device->open_count--;
 	mutex_unlock(&device->dev_set->lock);
 
 	module_put(device->dev->driver->owner);
@@ -1897,7 +1905,7 @@  int vfio_pin_pages(struct vfio_device *vdev, unsigned long *user_pfn, int npage,
 	struct vfio_iommu_driver *driver;
 	int ret;
 
-	if (!user_pfn || !phys_pfn || !npage)
+	if (!user_pfn || !phys_pfn || !npage || !vfio_assert_device_open(vdev))
 		return -EINVAL;
 
 	if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
@@ -1906,10 +1914,6 @@  int vfio_pin_pages(struct vfio_device *vdev, unsigned long *user_pfn, int npage,
 	if (group->dev_counter > 1)
 		return -EINVAL;
 
-	ret = vfio_group_add_container_user(group);
-	if (ret)
-		return ret;
-
 	container = group->container;
 	driver = container->iommu_driver;
 	if (likely(driver && driver->ops->pin_pages))
@@ -1919,8 +1923,6 @@  int vfio_pin_pages(struct vfio_device *vdev, unsigned long *user_pfn, int npage,
 	else
 		ret = -ENOTTY;
 
-	vfio_group_try_dissolve_container(group);
-
 	return ret;
 }
 EXPORT_SYMBOL(vfio_pin_pages);
@@ -1941,16 +1943,12 @@  int vfio_unpin_pages(struct vfio_device *vdev, unsigned long *user_pfn,
 	struct vfio_iommu_driver *driver;
 	int ret;
 
-	if (!user_pfn || !npage)
+	if (!user_pfn || !npage || !vfio_assert_device_open(vdev))
 		return -EINVAL;
 
 	if (npage > VFIO_PIN_PAGES_MAX_ENTRIES)
 		return -E2BIG;
 
-	ret = vfio_group_add_container_user(vdev->group);
-	if (ret)
-		return ret;
-
 	container = vdev->group->container;
 	driver = container->iommu_driver;
 	if (likely(driver && driver->ops->unpin_pages))
@@ -1959,8 +1957,6 @@  int vfio_unpin_pages(struct vfio_device *vdev, unsigned long *user_pfn,
 	else
 		ret = -ENOTTY;
 
-	vfio_group_try_dissolve_container(vdev->group);
-
 	return ret;
 }
 EXPORT_SYMBOL(vfio_unpin_pages);
@@ -1989,13 +1985,9 @@  int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data,
 	struct vfio_iommu_driver *driver;
 	int ret = 0;
 
-	if (!data || len <= 0)
+	if (!data || len <= 0 || !vfio_assert_device_open(vdev))
 		return -EINVAL;
 
-	ret = vfio_group_add_container_user(vdev->group);
-	if (ret)
-		return ret;
-
 	container = vdev->group->container;
 	driver = container->iommu_driver;
 
@@ -2004,9 +1996,6 @@  int vfio_dma_rw(struct vfio_device *vdev, dma_addr_t user_iova, void *data,
 					  user_iova, data, len, write);
 	else
 		ret = -ENOTTY;
-
-	vfio_group_try_dissolve_container(vdev->group);
-
 	return ret;
 }
 EXPORT_SYMBOL(vfio_dma_rw);
@@ -2019,10 +2008,6 @@  static int vfio_register_iommu_notifier(struct vfio_group *group,
 	struct vfio_iommu_driver *driver;
 	int ret;
 
-	ret = vfio_group_add_container_user(group);
-	if (ret)
-		return -EINVAL;
-
 	container = group->container;
 	driver = container->iommu_driver;
 	if (likely(driver && driver->ops->register_notifier))
@@ -2030,9 +2015,6 @@  static int vfio_register_iommu_notifier(struct vfio_group *group,
 						     events, nb);
 	else
 		ret = -ENOTTY;
-
-	vfio_group_try_dissolve_container(group);
-
 	return ret;
 }
 
@@ -2043,10 +2025,6 @@  static int vfio_unregister_iommu_notifier(struct vfio_group *group,
 	struct vfio_iommu_driver *driver;
 	int ret;
 
-	ret = vfio_group_add_container_user(group);
-	if (ret)
-		return -EINVAL;
-
 	container = group->container;
 	driver = container->iommu_driver;
 	if (likely(driver && driver->ops->unregister_notifier))
@@ -2054,9 +2032,6 @@  static int vfio_unregister_iommu_notifier(struct vfio_group *group,
 						       nb);
 	else
 		ret = -ENOTTY;
-
-	vfio_group_try_dissolve_container(group);
-
 	return ret;
 }
 
@@ -2085,10 +2060,6 @@  static int vfio_register_group_notifier(struct vfio_group *group,
 	if (*events)
 		return -EINVAL;
 
-	ret = vfio_group_add_container_user(group);
-	if (ret)
-		return -EINVAL;
-
 	ret = blocking_notifier_chain_register(&group->notifier, nb);
 
 	/*
@@ -2098,25 +2069,6 @@  static int vfio_register_group_notifier(struct vfio_group *group,
 	if (!ret && set_kvm && group->kvm)
 		blocking_notifier_call_chain(&group->notifier,
 					VFIO_GROUP_NOTIFY_SET_KVM, group->kvm);
-
-	vfio_group_try_dissolve_container(group);
-
-	return ret;
-}
-
-static int vfio_unregister_group_notifier(struct vfio_group *group,
-					 struct notifier_block *nb)
-{
-	int ret;
-
-	ret = vfio_group_add_container_user(group);
-	if (ret)
-		return -EINVAL;
-
-	ret = blocking_notifier_chain_unregister(&group->notifier, nb);
-
-	vfio_group_try_dissolve_container(group);
-
 	return ret;
 }
 
@@ -2126,7 +2078,7 @@  int vfio_register_notifier(struct vfio_device *dev, enum vfio_notify_type type,
 	struct vfio_group *group = dev->group;
 	int ret;
 
-	if (!nb || !events || (*events == 0))
+	if (!nb || !events || (*events == 0) || !vfio_assert_device_open(dev))
 		return -EINVAL;
 
 	switch (type) {
@@ -2150,7 +2102,7 @@  int vfio_unregister_notifier(struct vfio_device *dev,
 	struct vfio_group *group = dev->group;
 	int ret;
 
-	if (!nb)
+	if (!nb || !vfio_assert_device_open(dev))
 		return -EINVAL;
 
 	switch (type) {
@@ -2158,7 +2110,7 @@  int vfio_unregister_notifier(struct vfio_device *dev,
 		ret = vfio_unregister_iommu_notifier(group, nb);
 		break;
 	case VFIO_GROUP_NOTIFY:
-		ret = vfio_unregister_group_notifier(group, nb);
+		ret = blocking_notifier_chain_unregister(&group->notifier, nb);
 		break;
 	default:
 		ret = -EINVAL;