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Now, the right PCI bus:device:function (BDF) is reported to the kernel during assign_pci syscall - beforehand it was ever 0:0.0. The BDF is needed to lookup the correct DMAR unit the kernel has to configure. This was revealed as the DMAR unit for Intel graphics on x201 is not the same as for all other PCI devices we have drivers for on this platform. Fixes #1848