[Bug 42636] PCI passthrough does not work with AMD iommu for PCI device

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https://bugzilla.kernel.org/show_bug.cgi?id=42636





--- Comment #4 from Klaus Mueller <kmueller@justmail.de>  2012-03-30 11:07:21 ---
Created an attachment (id=72753)
 --> (https://bugzilla.kernel.org/attachment.cgi?id=72753)
log of qemu-kvm crash

I tried again with only one pci card inserted (Network controller: RaLink
RT2800 802.11n PCI). The tree is now like this:

           +-14.4-[06]----07.0  RaLink RT2800 802.11n PCI

I booted with intel_iommu=on (does this apply to AMD, too?).

If I start the VM now, I'm getting the same error again:
Failed to assign device "hostdev0" : Device or resource busy
qemu-kvm: -device
pci-assign,host=06:07.0,id=hostdev0,configfd=19,bus=pci.0,addr=0x5: Device
'pci-assign' could not be initialized

If I'm additionally putting the bridge to the VM, I'm getting an error telling
me about a missing reset function and another missing thing, too.

If I remove the bridge from the VM xml-file again and start it now, the VM
suddenly starts up fine :-))).

But if the VM is stopped again (with halt in the VM or with virsh shutdown VM,
qemu-kvm crashes and remains as zombie. The output from messages is attached as
iommu-trace.log.

kvm is 0.15.0 and kernel is 3.1.10 (kernel-desktop from openSUSE)

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