[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


Daniel Mayer <listenmitglied@xxxxxxxx> changed:

           What    |Removed                     |Added
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                 CC|                            |listenmitglied@xxxxxxxx




--- Comment #3 from Daniel Mayer <listenmitglied@xxxxxxxx>  2012-03-30 07:48:26 ---
Hi,
I feel with you - I had many, many headaches with PCI-PTrough...

You said you unloaded the driver module for both devices. 
a) do you have the pcistub module available (kernel config)? For some PCI
devices I had to enable both DMA and IRQ remapping in the kernel. The latter is
disabled by default. Otherwise: sometimes, especially with older PCI cards, IRQ
remapping had to be disabled... at least as module or compiled-in:

Bus options (PCI etc.) --> Support for DMA Remapping Devices
Bus options (PCI etc.) --> Enable DMA Remapping Devices
Bus options (PCI etc.) --> PCI Stub driver

[quote]
Of course, I unloaded the module of this additional device
before trying to passthrough it to the guest.[/qoute]

b) Did you try to assign the pcistub driver as printed here:
http://www.linux-kvm.org/page/How_to_assign_devices_with_VT-d_in_KVM

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