From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andrew Rybchenko <arybchenko@solarflare.com>
Subject: vfio: failed to select IOMMU type
Date: Sat, 1 Apr 2017 13:46:45 +0300
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Cc: Anatoly Burakov <anatoly.burakov@intel.com>
To: "dev@dpdk.org" <dev@dpdk.org>, Alejandro Lucero
 <alejandro.lucero@netronome.com>
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Hi,

after the following commit (it was picked up by dpdk-next-net recently), 
I have problems with VFIO:
===
commit 94c0776b1badd1ee715d60f07391058f23494365
Author: Alejandro Lucero <alejandro.lucero@netronome.com>
Date:   Wed Mar 29 10:54:50 2017 +0100

     vfio: support hotplug

     Current device hotplug is just supported by UIO managed devices.
     This patch adds same functionality with VFIO.

     It has been validated through tests using IOMMU and also with
     VFIO and no-iommu mode.

     Signed-off-by: Alejandro Lucero <alejandro.lucero@netronome.com>
     Acked-by: Anatoly Burakov <anatoly.burakov@intel.com>
===

The second PCI function fails to bind:
# testpmd -w 06:00.0 -w 06:00.1 -c 0xc -n 4  -- --rxd=512 --txd=512 
--crc-strip --disable-hw-vlan-filter --disable-hw-vlan-strip
EAL: Detected 16 lcore(s)
EAL: 2048 hugepages of size 2097152 reserved, but no mounted hugetlbfs 
found for that size
EAL: Probing VFIO support...
EAL: VFIO support initialized
EAL: PCI device 0000:06:00.0 on NUMA socket 0
EAL:   probe driver: 1924:a03 net_sfc_efx
EAL:   using IOMMU type 1 (Type 1)
EAL: Ignore mapping IO port bar(0) addr: 2101
EAL: PCI device 0000:06:00.1 on NUMA socket 0
EAL:   probe driver: 1924:a03 net_sfc_efx
EAL:   0000:06:00.1 failed to select IOMMU type
EAL: Requested device 0000:06:00.1 cannot be used
EAL: Requested device 0000:7f:08.0 cannot be used
EAL: Requested device 0000:7f:08.2 cannot be used
EAL: Requested device 0000:7f:08.3 cannot be used
...

Also I don't understand why it spams about many other PCI functions 
taking into account that just 2 are specified in whitelist.

I've bisected to find commit when the problem appears, but has not found 
root cause yet.

Andrew.