RE: Query on IOMMU

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> From: Chris Wright [chrisw@xxxxxxxxxxxx]
>>
>> > 00:02.0 PCI bridge: ATI Technologies Inc RD890 PCI to PCI bridge (PCI express gpp port B)
>> >        Bus: primary=00, secondary=06, subordinate=06, sec-latency=0
>>
>> > 06:00.0 VGA compatible controller: nVidia Corporation G86 [Quadro NVS 290]
>>
>> As the secondary and subordinate are 06, it means GPU pass through won't work.
>
>No, it just means there are nor more bridges behind 00:02.0.  The GPU is
>a PCIe device in a PCIe port (which happens to look a lot like a
>bridge).  So, while GPU assignment has some tricky issues, I don't think
>you'll be stopped by the IOMMU.

Great thanks Chris. Like you said lspci -t -vvv explains it very well.

>
>> >> Please explain how to find out this information.
>>
>> > Using lspci -t you can see the topology pretty easily.  Otherwise you
>> > can sift through lspci output to find the topology.
>>
>> Thanks a lot Chris for explaining everything.
>
>You're welcome.  Good luck with your project.

Thanks a lot. I will keep on posting on the mailing list whenever I need help.

>
>thanks,
>-chris
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