Now we support two types of iommu backends, let's add the capability
to select one of them. This depends on whether an iommufd object has
been linked with the vfio-ap device:
if the user wants to use the legacy backend, it shall not
link the vfio-ap device with any iommufd object:
-device vfio-ap,sysfsdev=/sys/bus/mdev/devices/XXX
This is called the legacy mode/backend.
If the user wants to use the iommufd backend (/dev/iommu) it
shall pass an iommufd object id in the vfio-ap device options:
-object iommufd,id=iommufd0
-device vfio-ap,sysfsdev=/sys/bus/mdev/devices/XXX,iommufd=iommufd0
Suggested-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Matthew Rosato <mjrosato@linux.ibm.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>
336f308958