> From: Jason Gunthorpe <jgg@xxxxxxxxxx> > Sent: Tuesday, November 8, 2022 8:49 AM > > This is the basic infrastructure of a new miscdevice to hold the iommufd > IOCTL API. > > It provides: > - A miscdevice to create file descriptors to run the IOCTL interface over > > - A table based ioctl dispatch and centralized extendable pre-validation > step > > - An xarray mapping userspace ID's to kernel objects. The design has > multiple inter-related objects held within in a single IOMMUFD fd > > - A simple usage count to build a graph of object relations and protect > against hostile userspace racing ioctls > > The only IOCTL provided in this patch is the generic 'destroy any object > by handle' operation. > > Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx> > Tested-by: Nicolin Chen <nicolinc@xxxxxxxxxx> > Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx> > Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxx> Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>
