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intel-iommu: Implement iommu_device_group
We generally have BDF granularity for devices, so we just need to make sure devices aren't hidden behind PCIe-to-PCI bridges. We can then make up a group number that's simply the concatenated seg|bus|dev|fn so we don't have to track them (not that users should depend on that). Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
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