On Mon, Mar 27, 2023 at 02:34:53AM -0700, Yi Liu wrote: > as an alternative method for ownership check when iommufd is used. In > this case all opened devices in the affected dev_set are verified to > be bound to a same valid iommufd value to allow reset. It's simpler > and faster as user does not need to pass a set of fds and kernel no > need to search the device within the given fds. > > a device in noiommu mode doesn't have a valid iommufd, so this method > should not be used in a dev_set which contains multiple devices and one > of them is in noiommu. The only allowed noiommu scenario is that the > calling device is noiommu and it's in a singleton dev_set. > > Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx> > Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> > Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx> > --- > drivers/vfio/pci/vfio_pci_core.c | 42 +++++++++++++++++++++++++++----- > include/uapi/linux/vfio.h | 9 ++++++- > 2 files changed, 44 insertions(+), 7 deletions(-) Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Jason
