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Ideally they would move over to the new APIs, but for > > now protect against accidentally mix and matching the wrong components. > > > > The iommu drivers support either the old iommu_set_fault_handler() via the > > driver calling report_iommu_fault(), or they are newer server focused > > drivers that call iommu_report_device_fault(). > > > > Include a flag in the domain_ops if it calls report_iommu_fault() and > > block iommu_set_fault_handler() on iommu's that can't support it. > > This isn't a domain operation though; depending on how you look at it, > supporting a legacy fault_handler is either a capability of the IOMMU driver > (that would be reachable via domain->owner->capable) or a property of the > iommu_domain itself that the drivers can set at allocation time (basically > this same patch just with the lines in slightly different places). That's right, the issue is: void iommu_set_fault_handler(struct iommu_domain *domain, iommu_fault_handler_t handler, void *token) We can't get to the iommu instance starting from a domain pointer Do you think we should change the above signature to include a struct device *? Jason