Hi all, Some efforts to emulate AMD IOMMU have being going over the past few months.
In real hardware AMD IOMMU is implemented as a PCI function. When emulating it in Qemu we want to allocate it MMIO space but real AMD IOMMU manage to reserve memory without making a BAR request, probably through a static address that's written by the device.(This is something similar to what non-PCI bus devices do).Trying to reserve memory via a BAR request results in address conflicts(in Linux) and all other PCI devices reserve platform resources via BAR requests. I would like to hear suggestions on how to reserve a memory region for the device without making a BAR request. Cheers, David.
