linux-kernel - [PATCH 2/7] vfio: Export unmap_mapping

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Date:   Thu, 05 Aug 2021 11:07:22 -0600
From:   Alex Williamson <alex.williamson@...hat.com>
To:     alex.williamson@...hat.com
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org, jgg@...dia.com,
        peterx@...hat.com
Subject: [PATCH 2/7] vfio: Export unmap_mapping_range() wrapper

Allow bus drivers to use vfio pseudo fs mapping to zap all mmaps
across a range of their device files.

Signed-off-by: Alex Williamson <alex.williamson@...hat.com>
---
 drivers/vfio/vfio.c  |    7 +++++++
 include/linux/vfio.h |    2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/vfio/vfio.c b/drivers/vfio/vfio.c
index b88de89bda31..1e4fc69fee7d 100644
--- a/drivers/vfio/vfio.c
+++ b/drivers/vfio/vfio.c
@@ -560,6 +560,13 @@ static struct inode *vfio_fs_inode_new(void)
 	return inode;
 }
 
+void vfio_device_unmap_mapping_range(struct vfio_device *device,
+				     loff_t start, loff_t len)
+{
+	unmap_mapping_range(device->inode->i_mapping, start, len, true);
+}
+EXPORT_SYMBOL_GPL(vfio_device_unmap_mapping_range);
+
 /**
  * Device objects - create, release, get, put, search
  */
diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 90bcc2e9c8eb..712813703e5a 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -66,6 +66,8 @@ int vfio_register_group_dev(struct vfio_device *device);
 void vfio_unregister_group_dev(struct vfio_device *device);
 extern struct vfio_device *vfio_device_get_from_dev(struct device *dev);
 extern void vfio_device_put(struct vfio_device *device);
+extern void vfio_device_unmap_mapping_range(struct vfio_device *device,
+					    loff_t start, loff_t len);
 
 /* events for the backend driver notify callback */
 enum vfio_iommu_notify_type {