On Mon, 28 Feb 2022 08:50:53 +0800 Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> wrote: > As DMA ownership is claimed for the iommu group when a VFIO group is > added to a VFIO container, the VFIO group viability is guaranteed as long > as group->container_users > 0. Remove those unnecessary group viability > checks which are only hit when group->container_users is not zero. > > The only remaining reference is in GROUP_GET_STATUS, which could be called > at any time when group fd is valid. Here we just replace the > vfio_group_viable() by directly calling IOMMU core to get viability status. > > Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> > Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> > --- > drivers/vfio/vfio.c | 18 ++++++------------ > 1 file changed, 6 insertions(+), 12 deletions(-) Acked-by: Alex Williamson <alex.williamson@xxxxxxxxxx>
