> From: Eric Auger <eric.auger@xxxxxxxxxx> > Sent: Wednesday, April 5, 2023 7:48 PM > > On 4/1/23 16:44, Yi Liu wrote: > > There are users that need to check if vfio_device is opened as cdev. > > e.g. vfio-pci. This adds a flag in vfio_device, it will be set in the > > cdev path when device is opened. This is not used at this moment, but > > a preparation for vfio device cdev support. > > better to squash this patch with the patch setting cdev_opened then? But that would be in the cdev series. Maybe only add this helper to return false and add the cdev_opened in below patch. Will this be better? https://lore.kernel.org/kvm/20230401151833.124749-23-yi.l.liu@xxxxxxxxx/ > Thanks > > Eric > > > > Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx> > > --- > > include/linux/vfio.h | 7 +++++++ > > 1 file changed, 7 insertions(+) > > > > diff --git a/include/linux/vfio.h b/include/linux/vfio.h > > index f8fb9ab25188..d9a0770e5fc1 100644 > > --- a/include/linux/vfio.h > > +++ b/include/linux/vfio.h > > @@ -62,6 +62,7 @@ struct vfio_device { > > struct iommufd_device *iommufd_device; > > bool iommufd_attached; > > #endif > > + bool cdev_opened; > > }; > > > > /** > > @@ -151,6 +152,12 @@ vfio_iommufd_physical_devid(struct vfio_device *vdev, > u32 *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; > > +} > > + > > /** > > * @migration_set_state: Optional callback to change the migration state for > > * devices that support migration. It's mandatory for
