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[Qemu-devel] [RFC] AMD IOMMU: emulate multiple devices
From: |
David Kiarie |
Subject: |
[Qemu-devel] [RFC] AMD IOMMU: emulate multiple devices |
Date: |
Wed, 8 Jun 2016 13:00:31 +0300 |
Hello all,
This patch tries to solve a problem whereby real AMD IOMMUs exhibit both PCI
and Platform device properties. AMD IOMMU properties that conflict with
conventional PCI devices' features include the fact that its not a BusMaster
device and reserves MMIO region without a BAR register among others.
There is some already ongoing work on Intel IOMMU Interrupt remapping with
implements an IOMMU base class[1], as a platform device(which means the moment
I inherit from this class my device loses it's PCI properties). I am therefore
forced to find a way to combine both PCI and platform features(which I had
previously avoided) into AMD IOMMU.
X86-IOMMU(common code)
|
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/ \
/ \
Intel IOMMU AMD IOMMU
This patch implements a stripped down sample of how I plan to solve this issue.
It basically implements PCI device which serves to 'steal' PCI config space
while the main device remains a platform device. The platform device maintains
a reference to the PCI device and hence the relevant PCI config space. This
device will also require [2] to work.
Looking forward to your comments!
[1] http://thread.gmane.org/gmane.comp.emulators.qemu/414510
[2] http://thread.gmane.org/gmane.comp.emulators.qemu/413018
David Kiarie (1):
hw/i386: Composite Bus and PCI device
hw/i386/compositedevice.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 113 insertions(+)
create mode 100644 hw/i386/compositedevice.c
--
2.1.4
- [Qemu-devel] [RFC] AMD IOMMU: emulate multiple devices,
David Kiarie <=