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This requires >> a bit refactoring to prepare for it. > > Above description is a bit hard to understand, are you saying > > ... the intel_iommu_set_dev_pasid() needs to roll back to the old > configuration in the failure path, therefore refactor it to prepare for > the subsequent patches ... This is the partial reason, but not the most related reason of this patch. Say without this patch, the intel_iommu_set_dev_pasid() call avoid roll back to the old configuration in the failure path as long as it calls the pasid replace helpers. So I chose to describe like the above. Maybe another choice is to name this patch as consolidate the dev_pasid_info adding and removing to be a paired helpers. This can be used by other set_dev_pasid op within intel iommu driver. > ? > >> >> domain_add_dev_pasid() and domain_remove_dev_pasid() are added to add/remove >> the dev_pasid_info which represents the association of the pasid/device and >> domain. Till now, it's still not ready for replacement yet. >> >> Signed-off-by: Yi Liu >> --- >>   drivers/iommu/intel/iommu.c | 90 +++++++++++++++++++++++++------------ >>   1 file changed, 61 insertions(+), 29 deletions(-) > > The change itself looks good to me, > > Reviewed-by: Lu Baolu > -- Regards, Yi Liu