[Intel-gfx] [PATCH v3 07/12] vfio: Accpet device file from vfio PCI hot reset path

[Liu, Yi L]

> From: Eric Auger <eric.auger at redhat.com>
> Sent: Wednesday, April 5, 2023 4:08 PM
> 
> Hi Yi,
> 
> On 4/1/23 16:44, Yi Liu wrote:
> > This extends both vfio_file_is_valid() and vfio_file_has_dev() to accept
> > device file from the vfio PCI hot reset.
> typo in the title s/Accpet/Accept

thanks. would correct it.

> >
> > Reviewed-by: Kevin Tian <kevin.tian at intel.com>
> > Reviewed-by: Jason Gunthorpe <jgg at nvidia.com>
> > Tested-by: Yanting Jiang <yanting.jiang at intel.com>
> > Signed-off-by: Yi Liu <yi.l.liu at intel.com>
> > ---
> >  drivers/vfio/vfio_main.c | 23 +++++++++++++++++++----
> >  1 file changed, 19 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/vfio/vfio_main.c b/drivers/vfio/vfio_main.c
> > index fe7446805afd..ebbb6b91a498 100644
> > --- a/drivers/vfio/vfio_main.c
> > +++ b/drivers/vfio/vfio_main.c
> > @@ -1154,13 +1154,23 @@ const struct file_operations vfio_device_fops = {
> >  	.mmap		= vfio_device_fops_mmap,
> >  };
> >
> > +static struct vfio_device *vfio_device_from_file(struct file *file)
> > +{
> > +	struct vfio_device *device = file->private_data;
> > +
> > +	if (file->f_op != &vfio_device_fops)
> > +		return NULL;
> > +	return device;
> > +}
> > +
> >  /**
> >   * vfio_file_is_valid - True if the file is valid vfio file
> >   * @file: VFIO group file or VFIO device file
> >   */
> >  bool vfio_file_is_valid(struct file *file)
> >  {
> > -	return vfio_group_from_file(file);
> > +	return vfio_group_from_file(file) ||
> > +	       vfio_device_from_file(file);
> >  }
> >  EXPORT_SYMBOL_GPL(vfio_file_is_valid);
> >
> > @@ -1174,12 +1184,17 @@ EXPORT_SYMBOL_GPL(vfio_file_is_valid);
> >  bool vfio_file_has_dev(struct file *file, struct vfio_device *device)
> >  {
> >  	struct vfio_group *group;
> > +	struct vfio_device *vdev;
> >
> >  	group = vfio_group_from_file(file);
> > -	if (!group)
> > -		return false;
> > +	if (group)
> > +		return vfio_group_has_dev(group, device);
> > +
> > +	vdev = vfio_device_from_file(file);
> > +	if (vdev)
> > +		return vdev == device;
> >
> > -	return vfio_group_has_dev(group, device);
> > +	return false;
> >  }
> >  EXPORT_SYMBOL_GPL(vfio_file_has_dev);
> >
> With Alex' suggestion
> Reviewed-by: Eric Auger <eric.auger at redhat.com>
> 
> Eric