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[Qemu-devel] Allocate PCI MMIO without BAR requests.


From: David kiarie
Subject: [Qemu-devel] Allocate PCI MMIO without BAR requests.
Date: Fri, 26 Jun 2015 18:32:59 +0300

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.



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