mlx4 partitions + SR-IOV - P_Key not found

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I am using a ConnectX-3 (MCX354A-FCB_A2-A5).  The system is Ubuntu
16.04 with 4.4.0-72-generic

I can use partitions fine with the root device, and I can do
unpartitioned ipoib in qemu-kvm using virtual functions.

However, when I try to use a partition in the guest, it gives me
errors like this: ib0.8010: P_Key 0x8010 is not found

I tried both the inbox mlx4 driver and OFED 4.0-2.0.0.1

Should partitions work with SR-IOV virtual functions?  If so, what
should I do to debug this?

Thanks,
Mark
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