[ovirt-users] VM support for Infiniband

Kevin Hung khung at nullaxiom.com
Fri Sep 30 14:10:33 UTC 2016

On 9/30/2016 9:28 AM, Michal Skrivanek wrote:
>> On 30 Sep 2016, at 03:56, Kevin Hung <khung at nullaxiom.com> wrote:
>> Hello,
>> I have been trying (unsuccessfully) to add my Infiniband HCAs on my VM hosts to oVirt 4.0.4. I am not using IBoIP, just plain Infiniband. I would like to be able to pass through the card (or better yet the VF from SR-IOV) to the guest VM.
> SR-IOV should work (or general PCI passthrough), it’s then transparent to oVirt. Did you not succeed with setting up SR-IOV or generic passthrough of the HCA?
oVirt sees the HCA as SR-IOV capable and it sees the VFs, so I believe I 
have set up SR-IOV correctly. I was able to do a generic passthrough of 
the HCA, but I was not able to pass through the VFs to more than one VM 
probably because they are all in the same IOMMU group. I first tried 
following the oVirt 3.6 Deep Dive video on SR-IOV [1] but was stuck 
because of the bridging problem.

>>  From what I can figure out, oVirt is trying to bridge the interface but I don't think that will work as shown here [1]. Does oVirt currently have support for passing through Infiniband to VMs? If not, are there any plans to support it?
> Well, at least for generic passthrough the PCI device would be detached from the host so should not be recognized/touched by oVirt networking code at all.
> Thanks,
> michal
>> [1] http://lists.ovirt.org/pipermail/users/2016-July/040898.html
>> Thanks,
>> Kevin Hung
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[1] https://www.youtube.com/watch?v=A-MROZ8D06Y

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