RE: [PATCH v2 07/17] iommufd: Make sw_msi_start a group global

From: Jason Gunthorpe jgg@nvidia.com Sent: Wednesday, March 8, 2023 8:36 AM

The sw_msi_start is only set by the ARM drivers and it is always constant. Due to the way vfio/iommufd allow domains to be re-used between devices we have a built in assumption that there is only one value for sw_msi_start and it is global to the system.

To make replace simpler where we may not reparse the iommu_get_resv_regions() move the sw_msi_start to the iommufd_group so it is always available once any HWPT has been attached.

Signed-off-by: Jason Gunthorpe jgg@nvidia.com

Reviewed-by: Kevin Tian kevin.tian@intel.com