Re: [PATCH v2 1/2] vfio: Replace the DMA unmapping notifier with a callback

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Reviewed-by: Tony Krowiak <akrowiak@xxxxxxxxxxxxx>

On 6/7/22 7:02 PM, Jason Gunthorpe wrote:
Instead of having drivers register the notifier with explicit code just
have them provide a dma_unmap callback op in their driver ops and rely on
the core code to wire it up.

Suggested-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
---
  drivers/gpu/drm/i915/gvt/gvt.h        |   1 -
  drivers/gpu/drm/i915/gvt/kvmgt.c      |  75 ++++-----------
  drivers/s390/cio/vfio_ccw_ops.c       |  41 ++-------
  drivers/s390/cio/vfio_ccw_private.h   |   1 -
  drivers/s390/crypto/vfio_ap_ops.c     |  53 ++---------
  drivers/s390/crypto/vfio_ap_private.h |   3 -
  drivers/vfio/vfio.c                   | 126 +++++++++-----------------
  drivers/vfio/vfio.h                   |   5 +
  include/linux/vfio.h                  |  21 +----
  9 files changed, 87 insertions(+), 239 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
index aee1a45da74bcb..705689e6401197 100644
--- a/drivers/gpu/drm/i915/gvt/gvt.h
+++ b/drivers/gpu/drm/i915/gvt/gvt.h
@@ -226,7 +226,6 @@ struct intel_vgpu {
  	unsigned long nr_cache_entries;
  	struct mutex cache_lock;
- struct notifier_block iommu_notifier;
  	atomic_t released;
struct kvm_page_track_notifier_node track_node;
diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
index e2f6c56ab3420c..ecd5bb37b63a2a 100644
--- a/drivers/gpu/drm/i915/gvt/kvmgt.c
+++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
@@ -729,34 +729,25 @@ int intel_gvt_set_edid(struct intel_vgpu *vgpu, int port_num)
  	return ret;
  }
-static int intel_vgpu_iommu_notifier(struct notifier_block *nb,
-				     unsigned long action, void *data)
+static void intel_vgpu_dma_unmap(struct vfio_device *vfio_dev, u64 iova,
+				 u64 length)
  {
-	struct intel_vgpu *vgpu =
-		container_of(nb, struct intel_vgpu, iommu_notifier);
-
-	if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
-		struct vfio_iommu_type1_dma_unmap *unmap = data;
-		struct gvt_dma *entry;
-		unsigned long iov_pfn, end_iov_pfn;
+	struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
+	struct gvt_dma *entry;
+	u64 iov_pfn = iova >> PAGE_SHIFT;
+	u64 end_iov_pfn = iov_pfn + length / PAGE_SIZE;
- iov_pfn = unmap->iova >> PAGE_SHIFT;
-		end_iov_pfn = iov_pfn + unmap->size / PAGE_SIZE;
+	mutex_lock(&vgpu->cache_lock);
+	for (; iov_pfn < end_iov_pfn; iov_pfn++) {
+		entry = __gvt_cache_find_gfn(vgpu, iov_pfn);
+		if (!entry)
+			continue;
- mutex_lock(&vgpu->cache_lock);
-		for (; iov_pfn < end_iov_pfn; iov_pfn++) {
-			entry = __gvt_cache_find_gfn(vgpu, iov_pfn);
-			if (!entry)
-				continue;
-
-			gvt_dma_unmap_page(vgpu, entry->gfn, entry->dma_addr,
-					   entry->size);
-			__gvt_cache_remove_entry(vgpu, entry);
-		}
-		mutex_unlock(&vgpu->cache_lock);
+		gvt_dma_unmap_page(vgpu, entry->gfn, entry->dma_addr,
+				   entry->size);
+		__gvt_cache_remove_entry(vgpu, entry);
  	}
-
-	return NOTIFY_OK;
+	mutex_unlock(&vgpu->cache_lock);
  }
static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu)
@@ -783,36 +774,20 @@ static bool __kvmgt_vgpu_exist(struct intel_vgpu *vgpu)
  static int intel_vgpu_open_device(struct vfio_device *vfio_dev)
  {
  	struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
-	unsigned long events;
-	int ret;
-
-	vgpu->iommu_notifier.notifier_call = intel_vgpu_iommu_notifier;
- events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
-	ret = vfio_register_notifier(vfio_dev, VFIO_IOMMU_NOTIFY, &events,
-				     &vgpu->iommu_notifier);
-	if (ret != 0) {
-		gvt_vgpu_err("vfio_register_notifier for iommu failed: %d\n",
-			ret);
-		goto out;
-	}
-
-	ret = -EEXIST;
  	if (vgpu->attached)
-		goto undo_iommu;
+		return -EEXIST;
- ret = -ESRCH;
  	if (!vgpu->vfio_device.kvm ||
  	    vgpu->vfio_device.kvm->mm != current->mm) {
  		gvt_vgpu_err("KVM is required to use Intel vGPU\n");
-		goto undo_iommu;
+		return -ESRCH;
  	}
kvm_get_kvm(vgpu->vfio_device.kvm); - ret = -EEXIST;
  	if (__kvmgt_vgpu_exist(vgpu))
-		goto undo_iommu;
+		return -EEXIST;
vgpu->attached = true; @@ -831,12 +806,6 @@ static int intel_vgpu_open_device(struct vfio_device *vfio_dev) atomic_set(&vgpu->released, 0);
  	return 0;
-
-undo_iommu:
-	vfio_unregister_notifier(vfio_dev, VFIO_IOMMU_NOTIFY,
-				 &vgpu->iommu_notifier);
-out:
-	return ret;
  }
static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu)
@@ -853,8 +822,6 @@ static void intel_vgpu_release_msi_eventfd_ctx(struct intel_vgpu *vgpu)
  static void intel_vgpu_close_device(struct vfio_device *vfio_dev)
  {
  	struct intel_vgpu *vgpu = vfio_dev_to_vgpu(vfio_dev);
-	struct drm_i915_private *i915 = vgpu->gvt->gt->i915;
-	int ret;
if (!vgpu->attached)
  		return;
@@ -864,11 +831,6 @@ static void intel_vgpu_close_device(struct vfio_device *vfio_dev)
intel_gvt_release_vgpu(vgpu); - ret = vfio_unregister_notifier(&vgpu->vfio_device, VFIO_IOMMU_NOTIFY,
-				       &vgpu->iommu_notifier);
-	drm_WARN(&i915->drm, ret,
-		 "vfio_unregister_notifier for iommu failed: %d\n", ret);
-
  	debugfs_remove(debugfs_lookup(KVMGT_DEBUGFS_FILENAME, vgpu->debugfs));
kvm_page_track_unregister_notifier(vgpu->vfio_device.kvm,
@@ -1610,6 +1572,7 @@ static const struct vfio_device_ops intel_vgpu_dev_ops = {
  	.write		= intel_vgpu_write,
  	.mmap		= intel_vgpu_mmap,
  	.ioctl		= intel_vgpu_ioctl,
+	.dma_unmap	= intel_vgpu_dma_unmap,
  };
static int intel_vgpu_probe(struct mdev_device *mdev)
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index b49e2e9db2dc6f..09e0ce7b72324c 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -44,31 +44,19 @@ static int vfio_ccw_mdev_reset(struct vfio_ccw_private *private)
  	return ret;
  }
-static int vfio_ccw_mdev_notifier(struct notifier_block *nb,
-				  unsigned long action,
-				  void *data)
+static void vfio_ccw_dma_unmap(struct vfio_device *vdev, u64 iova, u64 length)
  {
  	struct vfio_ccw_private *private =
-		container_of(nb, struct vfio_ccw_private, nb);
-
-	/*
-	 * Vendor drivers MUST unpin pages in response to an
-	 * invalidation.
-	 */
-	if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
-		struct vfio_iommu_type1_dma_unmap *unmap = data;
-
-		if (!cp_iova_pinned(&private->cp, unmap->iova))
-			return NOTIFY_OK;
+		container_of(vdev, struct vfio_ccw_private, vdev);
- if (vfio_ccw_mdev_reset(private))
-			return NOTIFY_BAD;
+	/* Drivers MUST unpin pages in response to an invalidation. */
+	if (!cp_iova_pinned(&private->cp, iova))
+		return;
- cp_free(&private->cp);
-		return NOTIFY_OK;
-	}
+	if (vfio_ccw_mdev_reset(private))
+		return;
- return NOTIFY_DONE;
+	cp_free(&private->cp);
  }
static ssize_t name_show(struct mdev_type *mtype,
@@ -178,19 +166,11 @@ static int vfio_ccw_mdev_open_device(struct vfio_device *vdev)
  {
  	struct vfio_ccw_private *private =
  		container_of(vdev, struct vfio_ccw_private, vdev);
-	unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
  	int ret;
- private->nb.notifier_call = vfio_ccw_mdev_notifier;
-
-	ret = vfio_register_notifier(vdev, VFIO_IOMMU_NOTIFY,
-				     &events, &private->nb);
-	if (ret)
-		return ret;
-
  	ret = vfio_ccw_register_async_dev_regions(private);
  	if (ret)
-		goto out_unregister;
+		return ret;
ret = vfio_ccw_register_schib_dev_regions(private);
  	if (ret)
@@ -204,7 +184,6 @@ static int vfio_ccw_mdev_open_device(struct vfio_device *vdev)
out_unregister:
  	vfio_ccw_unregister_dev_regions(private);
-	vfio_unregister_notifier(vdev, VFIO_IOMMU_NOTIFY, &private->nb);
  	return ret;
  }
@@ -222,7 +201,6 @@ static void vfio_ccw_mdev_close_device(struct vfio_device *vdev) cp_free(&private->cp);
  	vfio_ccw_unregister_dev_regions(private);
-	vfio_unregister_notifier(vdev, VFIO_IOMMU_NOTIFY, &private->nb);
  }
static ssize_t vfio_ccw_mdev_read_io_region(struct vfio_ccw_private *private,
@@ -645,6 +623,7 @@ static const struct vfio_device_ops vfio_ccw_dev_ops = {
  	.write = vfio_ccw_mdev_write,
  	.ioctl = vfio_ccw_mdev_ioctl,
  	.request = vfio_ccw_mdev_request,
+	.dma_unmap = vfio_ccw_dma_unmap,
  };
struct mdev_driver vfio_ccw_mdev_driver = {
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h
index 7272eb78861244..2627791c9006d4 100644
--- a/drivers/s390/cio/vfio_ccw_private.h
+++ b/drivers/s390/cio/vfio_ccw_private.h
@@ -98,7 +98,6 @@ struct vfio_ccw_private {
  	struct completion	*completion;
  	atomic_t		avail;
  	struct mdev_device	*mdev;
-	struct notifier_block	nb;
  	struct ccw_io_region	*io_region;
  	struct mutex		io_mutex;
  	struct vfio_ccw_region *region;
diff --git a/drivers/s390/crypto/vfio_ap_ops.c b/drivers/s390/crypto/vfio_ap_ops.c
index a7d2a95796d360..bb1a1677c5c230 100644
--- a/drivers/s390/crypto/vfio_ap_ops.c
+++ b/drivers/s390/crypto/vfio_ap_ops.c
@@ -1226,34 +1226,14 @@ static int vfio_ap_mdev_set_kvm(struct ap_matrix_mdev *matrix_mdev,
  	return 0;
  }
-/**
- * vfio_ap_mdev_iommu_notifier - IOMMU notifier callback
- *
- * @nb: The notifier block
- * @action: Action to be taken
- * @data: data associated with the request
- *
- * For an UNMAP request, unpin the guest IOVA (the NIB guest address we
- * pinned before). Other requests are ignored.
- *
- * Return: for an UNMAP request, NOFITY_OK; otherwise NOTIFY_DONE.
- */
-static int vfio_ap_mdev_iommu_notifier(struct notifier_block *nb,
-				       unsigned long action, void *data)
+static void vfio_ap_mdev_dma_unmap(struct vfio_device *vdev, u64 iova,
+				   u64 length)
  {
-	struct ap_matrix_mdev *matrix_mdev;
-
-	matrix_mdev = container_of(nb, struct ap_matrix_mdev, iommu_notifier);
-
-	if (action == VFIO_IOMMU_NOTIFY_DMA_UNMAP) {
-		struct vfio_iommu_type1_dma_unmap *unmap = data;
-		unsigned long g_pfn = unmap->iova >> PAGE_SHIFT;
-
-		vfio_unpin_pages(&matrix_mdev->vdev, &g_pfn, 1);
-		return NOTIFY_OK;
-	}
+	struct ap_matrix_mdev *matrix_mdev =
+		container_of(vdev, struct ap_matrix_mdev, vdev);
+	unsigned long g_pfn = iova >> PAGE_SHIFT;
- return NOTIFY_DONE;
+	vfio_unpin_pages(&matrix_mdev->vdev, &g_pfn, 1);
  }
/**
@@ -1380,27 +1360,11 @@ static int vfio_ap_mdev_open_device(struct vfio_device *vdev)
  {
  	struct ap_matrix_mdev *matrix_mdev =
  		container_of(vdev, struct ap_matrix_mdev, vdev);
-	unsigned long events;
-	int ret;
if (!vdev->kvm)
  		return -EINVAL;
- ret = vfio_ap_mdev_set_kvm(matrix_mdev, vdev->kvm);
-	if (ret)
-		return ret;
-
-	matrix_mdev->iommu_notifier.notifier_call = vfio_ap_mdev_iommu_notifier;
-	events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
-	ret = vfio_register_notifier(vdev, VFIO_IOMMU_NOTIFY, &events,
-				     &matrix_mdev->iommu_notifier);
-	if (ret)
-		goto err_kvm;
-	return 0;
-
-err_kvm:
-	vfio_ap_mdev_unset_kvm(matrix_mdev);
-	return ret;
+	return vfio_ap_mdev_set_kvm(matrix_mdev, vdev->kvm);
  }
static void vfio_ap_mdev_close_device(struct vfio_device *vdev)
@@ -1408,8 +1372,6 @@ static void vfio_ap_mdev_close_device(struct vfio_device *vdev)
  	struct ap_matrix_mdev *matrix_mdev =
  		container_of(vdev, struct ap_matrix_mdev, vdev);
- vfio_unregister_notifier(vdev, VFIO_IOMMU_NOTIFY,
-				 &matrix_mdev->iommu_notifier);
  	vfio_ap_mdev_unset_kvm(matrix_mdev);
  }
@@ -1461,6 +1423,7 @@ static const struct vfio_device_ops vfio_ap_matrix_dev_ops = {
  	.open_device = vfio_ap_mdev_open_device,
  	.close_device = vfio_ap_mdev_close_device,
  	.ioctl = vfio_ap_mdev_ioctl,
+	.dma_unmap = vfio_ap_mdev_dma_unmap,
  };
static struct mdev_driver vfio_ap_matrix_driver = {
diff --git a/drivers/s390/crypto/vfio_ap_private.h b/drivers/s390/crypto/vfio_ap_private.h
index a26efd804d0df3..abb59d59f81b20 100644
--- a/drivers/s390/crypto/vfio_ap_private.h
+++ b/drivers/s390/crypto/vfio_ap_private.h
@@ -81,8 +81,6 @@ struct ap_matrix {
   * @node:	allows the ap_matrix_mdev struct to be added to a list
   * @matrix:	the adapters, usage domains and control domains assigned to the
   *		mediated matrix device.
- * @iommu_notifier: notifier block used for specifying callback function for
- *		    handling the VFIO_IOMMU_NOTIFY_DMA_UNMAP even
   * @kvm:	the struct holding guest's state
   * @pqap_hook:	the function pointer to the interception handler for the
   *		PQAP(AQIC) instruction.
@@ -92,7 +90,6 @@ struct ap_matrix_mdev {
  	struct vfio_device vdev;
  	struct list_head node;
  	struct ap_matrix matrix;
-	struct notifier_block iommu_notifier;
  	struct kvm *kvm;
  	crypto_hook pqap_hook;
  	struct mdev_device *mdev;
diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index 61e71c1154be67..f005b644ab9e69 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -1077,8 +1077,20 @@ static void vfio_device_unassign_container(struct vfio_device *device)
  	up_write(&device->group->group_rwsem);
  }
+static int vfio_iommu_notifier(struct notifier_block *nb, unsigned long action,
+			       void *data)
+{
+	struct vfio_device *vfio_device =
+		container_of(nb, struct vfio_device, iommu_nb);
+	struct vfio_iommu_type1_dma_unmap *unmap = data;
+
+	vfio_device->ops->dma_unmap(vfio_device, unmap->iova, unmap->size);
+	return NOTIFY_OK;
+}
+
  static struct file *vfio_device_open(struct vfio_device *device)
  {
+	struct vfio_iommu_driver *iommu_driver;
  	struct file *filep;
  	int ret;
@@ -1109,6 +1121,18 @@ static struct file *vfio_device_open(struct vfio_device *device)
  			if (ret)
  				goto err_undo_count;
  		}
+
+		iommu_driver = device->group->container->iommu_driver;
+		if (device->ops->dma_unmap && iommu_driver &&
+		    iommu_driver->ops->register_notifier) {
+			unsigned long events = VFIO_IOMMU_NOTIFY_DMA_UNMAP;
+
+			device->iommu_nb.notifier_call = vfio_iommu_notifier;
+			iommu_driver->ops->register_notifier(
+				device->group->container->iommu_data, &events,
+				&device->iommu_nb);
+		}
+
  		up_read(&device->group->group_rwsem);
  	}
  	mutex_unlock(&device->dev_set->lock);
@@ -1143,8 +1167,16 @@ static struct file *vfio_device_open(struct vfio_device *device)
  err_close_device:
  	mutex_lock(&device->dev_set->lock);
  	down_read(&device->group->group_rwsem);
-	if (device->open_count == 1 && device->ops->close_device)
+	if (device->open_count == 1 && device->ops->close_device) {
  		device->ops->close_device(device);
+
+		iommu_driver = device->group->container->iommu_driver;
+		if (device->ops->dma_unmap && iommu_driver &&
+		    iommu_driver->ops->register_notifier)
+			iommu_driver->ops->unregister_notifier(
+				device->group->container->iommu_data,
+				&device->iommu_nb);
+	}
  err_undo_count:
  	device->open_count--;
  	if (device->open_count == 0 && device->kvm)
@@ -1339,12 +1371,20 @@ static const struct file_operations vfio_group_fops = {
  static int vfio_device_fops_release(struct inode *inode, struct file *filep)
  {
  	struct vfio_device *device = filep->private_data;
+	struct vfio_iommu_driver *iommu_driver;
mutex_lock(&device->dev_set->lock);
  	vfio_assert_device_open(device);
  	down_read(&device->group->group_rwsem);
  	if (device->open_count == 1 && device->ops->close_device)
  		device->ops->close_device(device);
+
+	iommu_driver = device->group->container->iommu_driver;
+	if (device->ops->dma_unmap && iommu_driver &&
+	    iommu_driver->ops->register_notifier)
+		iommu_driver->ops->unregister_notifier(
+			device->group->container->iommu_data,
+			&device->iommu_nb);
  	up_read(&device->group->group_rwsem);
  	device->open_count--;
  	if (device->open_count == 0)
@@ -2027,90 +2067,6 @@ int vfio_dma_rw(struct vfio_device *device, dma_addr_t user_iova, void *data,
  }
  EXPORT_SYMBOL(vfio_dma_rw);
-static int vfio_register_iommu_notifier(struct vfio_group *group,
-					unsigned long *events,
-					struct notifier_block *nb)
-{
-	struct vfio_container *container;
-	struct vfio_iommu_driver *driver;
-	int ret;
-
-	lockdep_assert_held_read(&group->group_rwsem);
-
-	container = group->container;
-	driver = container->iommu_driver;
-	if (likely(driver && driver->ops->register_notifier))
-		ret = driver->ops->register_notifier(container->iommu_data,
-						     events, nb);
-	else
-		ret = -ENOTTY;
-
-	return ret;
-}
-
-static int vfio_unregister_iommu_notifier(struct vfio_group *group,
-					  struct notifier_block *nb)
-{
-	struct vfio_container *container;
-	struct vfio_iommu_driver *driver;
-	int ret;
-
-	lockdep_assert_held_read(&group->group_rwsem);
-
-	container = group->container;
-	driver = container->iommu_driver;
-	if (likely(driver && driver->ops->unregister_notifier))
-		ret = driver->ops->unregister_notifier(container->iommu_data,
-						       nb);
-	else
-		ret = -ENOTTY;
-
-	return ret;
-}
-
-int vfio_register_notifier(struct vfio_device *device,
-			   enum vfio_notify_type type, unsigned long *events,
-			   struct notifier_block *nb)
-{
-	struct vfio_group *group = device->group;
-	int ret;
-
-	if (!nb || !events || (*events == 0) ||
-	    !vfio_assert_device_open(device))
-		return -EINVAL;
-
-	switch (type) {
-	case VFIO_IOMMU_NOTIFY:
-		ret = vfio_register_iommu_notifier(group, events, nb);
-		break;
-	default:
-		ret = -EINVAL;
-	}
-	return ret;
-}
-EXPORT_SYMBOL(vfio_register_notifier);
-
-int vfio_unregister_notifier(struct vfio_device *device,
-			     enum vfio_notify_type type,
-			     struct notifier_block *nb)
-{
-	struct vfio_group *group = device->group;
-	int ret;
-
-	if (!nb || !vfio_assert_device_open(device))
-		return -EINVAL;
-
-	switch (type) {
-	case VFIO_IOMMU_NOTIFY:
-		ret = vfio_unregister_iommu_notifier(group, nb);
-		break;
-	default:
-		ret = -EINVAL;
-	}
-	return ret;
-}
-EXPORT_SYMBOL(vfio_unregister_notifier);
-
  /*
   * Module/class support
   */
diff --git a/drivers/vfio/vfio.h b/drivers/vfio/vfio.h
index a6713022115155..cb2e4e9baa8fe8 100644
--- a/drivers/vfio/vfio.h
+++ b/drivers/vfio/vfio.h
@@ -33,6 +33,11 @@ enum vfio_iommu_notify_type {
  	VFIO_IOMMU_CONTAINER_CLOSE = 0,
  };
+/* events for register_notifier() */
+enum {
+	VFIO_IOMMU_NOTIFY_DMA_UNMAP = 1,
+};
+
  /**
   * struct vfio_iommu_driver_ops - VFIO IOMMU driver callbacks
   */
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index aa888cc517578e..b76623e3b92fca 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -44,6 +44,7 @@ struct vfio_device {
  	unsigned int open_count;
  	struct completion comp;
  	struct list_head group_next;
+	struct notifier_block iommu_nb;
  };
/**
@@ -60,6 +61,8 @@ struct vfio_device {
   * @match: Optional device name match callback (return: 0 for no-match, >0 for
   *         match, -errno for abort (ex. match with insufficient or incorrect
   *         additional args)
+ * @dma_unmap: Called when userspace unmaps IOVA from the container
+ *             this device is attached to.
   * @device_feature: Optional, fill in the VFIO_DEVICE_FEATURE ioctl
   * @migration_set_state: Optional callback to change the migration state for
   *         devices that support migration. It's mandatory for
@@ -85,6 +88,7 @@ struct vfio_device_ops {
  	int	(*mmap)(struct vfio_device *vdev, struct vm_area_struct *vma);
  	void	(*request)(struct vfio_device *vdev, unsigned int count);
  	int	(*match)(struct vfio_device *vdev, char *buf);
+	void	(*dma_unmap)(struct vfio_device *vdev, u64 iova, u64 length);
  	int	(*device_feature)(struct vfio_device *device, u32 flags,
  				  void __user *arg, size_t argsz);
  	struct file *(*migration_set_state)(
@@ -154,23 +158,6 @@ extern int vfio_unpin_pages(struct vfio_device *device, unsigned long *user_pfn,
  extern int vfio_dma_rw(struct vfio_device *device, dma_addr_t user_iova,
  		       void *data, size_t len, bool write);
-/* each type has independent events */
-enum vfio_notify_type {
-	VFIO_IOMMU_NOTIFY = 0,
-};
-
-/* events for VFIO_IOMMU_NOTIFY */
-#define VFIO_IOMMU_NOTIFY_DMA_UNMAP	BIT(0)
-
-extern int vfio_register_notifier(struct vfio_device *device,
-				  enum vfio_notify_type type,
-				  unsigned long *required_events,
-				  struct notifier_block *nb);
-extern int vfio_unregister_notifier(struct vfio_device *device,
-				    enum vfio_notify_type type,
-				    struct notifier_block *nb);
-
-
  /*
   * Sub-module helpers
   */




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