Public bug reported:

---Problem Description---
Using Ubuntu mainline kernel 
http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.8-rc6/
if we try to enable SRIOV in Mellanox CX4 card it will fail. 

# uname -r
4.8.0-040800rc6-generic
root@c158f2u09os:~# echo 7 > /sys/class/net/enP5p1s0f0/device/sriov_numvfs
-bash: echo: write error: Cannot allocate memory

logs show:
Sep 16 00:52:46 c158f2u09os kernel: [ 1419.778118] mlx5_core 0005:01:00.0: not 
enough MMIO resources for SR-IOV
Sep 16 00:52:46 c158f2u09os kernel: [ 1419.778238] mlx5_core 0005:01:00.0: 
enable sriov failed -12
Sep 16 00:52:46 c158f2u09os kernel: [ 1419.778604] mlx5_core 0005:01:00.0: 
mlx5_core_sriov_enable failed -12

---uname output---
4.8.0-040800rc6-generic
 
---Additional Hardware Info---
To recreate this you need power system and a Mellanox card that can be used for 
SRIOV.  

 
Machine Type = P8 
 
---Steps to Reproduce---
 with a Mellanox card like CX4 with SRIOV enabled.
just do this echo to the PF interface in this case was enP5p1s0f0.
echo 1 > /sys/class/net/enP5p1s0f0/device

If I take kernel 4.8 and I revert the following patch I can get it to
work again:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/patch/arch/powerpc/platforms/powernv
/pci-ioda.c?id=5958d19a143eb229e9ece20bd4c781ad41cb7d24

 From 5958d19a143eb229e9ece20bd4c781ad41cb7d24 Mon Sep 17 00:00:00 2001
 From: Benjamin Herrenschmidt <b...@kernel.crashing.org>
 Date: Fri, 8 Jul 2016 15:55:43 +1000
 Subject: powerpc/pnv/pci: Fix incorrect PE reservation attempt on some 64-bit 
BARs

** Affects: linux (Ubuntu)
     Importance: Undecided
     Assignee: Taco Screen team (taco-screen-team)
         Status: New


** Tags: architecture-ppc64le bugnameltc-146447 severity-critical 
targetmilestone-inin1610

** Tags added: architecture-ppc64le bugnameltc-146447 severity-critical
targetmilestone-inin1610

** Changed in: ubuntu
     Assignee: (unassigned) => Taco Screen team (taco-screen-team)

** Package changed: ubuntu => linux (Ubuntu)

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https://bugs.launchpad.net/bugs/1624961

Title:
  Ubuntu 16.10 KVM: kernel 4.8 can not enable SRIOV for power systems

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