[PATCH v4 5/9] vfio: Mark cdev usage in vfio_device

[Yi Liu <yi.l.liu@intel.com>]

Use it to differentiate whether to report group_id or dev_id in revised
VFIO_DEVICE_GET_PCI_HOT_RESET_INFO ioctl. Though it is not set at this
moment introducing it now allows us to get hot reset ready for cdev.

Signed-off-by: Yi Liu <yi.l.liu@intel.com>
---
 include/linux/vfio.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/linux/vfio.h b/include/linux/vfio.h
index 4ee613924435..298f4ef16be7 100644
--- a/include/linux/vfio.h
+++ b/include/linux/vfio.h
@@ -63,6 +63,7 @@ struct vfio_device {
 	bool iommufd_attached;
 #endif
 	bool noiommu;
+	bool cdev_opened;
 };
 
 /**
@@ -140,6 +141,12 @@ int vfio_iommufd_emulated_attach_ioas(struct vfio_device *vdev, u32 *pt_id);
 	((int (*)(struct vfio_device *vdev, u32 *pt_id)) NULL)
 #endif
 
+static inline bool vfio_device_cdev_opened(struct vfio_device *device)
+{
+	lockdep_assert_held(&device->dev_set->lock);
+	return device->cdev_opened;
+}
+
 /**
  * struct vfio_migration_ops - VFIO bus device driver migration callbacks
  *
-- 
2.34.1