This patch makes iommu/amd call report_iommu_fault() when an I/O page
fault occurs, which has two effects:
1) It allows device drivers to register a callback to be notified of
I/O page faults, via the iommu_set_fault_handler() API.
2) It triggers the io_page_fault tracepoint in report_iommu_fa
Lennert,
FYI: I have made some comments in V2 thread specifically around the new changes
that we discussed in that thread.
Thanks,
Suravee
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