Starting VPP as unprivileged process throws errors.

When running VPP as unprivileged:

• with hugepages mounted as user (uid/gid=1000) and
• with modified permissions of /dev/vfio-pci

Following errors are seen:

vpp:

mincore(0x1000000000, 1, [0])           = 0
close(5)                                = 0
getpid()                                = 6320
writev(2, [{iov_base="/usr/bin/vpp[6320]: buffer: vlib"..., iov_len=154}], 1/usr/bin/vpp[6320]: buffer: vlib_physmem_shared_map_create: pmalloc_map_pages: Unable to fulfill huge page allocation request: No such file or directory) = 154

/dev/vfio-pci

$ ls -al /dev/vfio/
total 0
drwxr-xr-x 2 root root 100 Oct 7 23:56 .
drwxr-xr-x 19 root root 4440 Oct 7 23:56 ..
crw------- 1 testuser testuser 241, 0 Oct 7 23:56 59

..
2019/10/08 00:17:19:483 debug pci 0000:07:02.0: open vid:0x8086 did:0x154c driver:vfio-pci iommu_group:59
2019/10/08 00:17:19:588 debug pci 0000:07:02.0: add_device_vfio region_info index:7 size:0x1000 offset:0x70000000000 flags: rd wr (0x3)
2019/10/08 00:17:19:701 debug pci 0000:07:02.0: map region 0 to va 0x0
2019/10/08 00:17:19:701 debug pci 0000:07:02.0: vlib_pci_region region_info index:0 size:0x10000 offset:0x0 flags: rd wr mmap (0x7)
2019/10/08 00:17:19:701 debug pci 0000:07:02.0: vfio_set_irqs index:2 count:5 flags: eventfd noresize (0x9)
2019/10/08 00:17:19:701 debug pci 0000:07:02.0: vfio_set_irqs index:2 count:5 flags: eventfd noresize (0x9)
2019/10/08 00:17:19:808 err avf 0000:00:00.0: error: vlib_physmem_last_error: unknown error
from avf_create_if: pci-addr 0000:07:02.0

While DPDK testpmd has no issue to use /dev/hugepages/rte_*.

$ build/app/testpmd --no-pci -c 0x7 – --nb-cores=2
EAL: Detected 32 lcore(s)
EAL: Detected 2 NUMA nodes
EAL: Multi-process socket /tmp/dpdk/rte/mp_socket
EAL: Selected IOVA mode 'VA'
EAL: No available hugepages reported in hugepages-1048576kB
EAL: Probing VFIO support...
EAL: VFIO support initialized
testpmd: No probed ethernet devices
testpmd: create a new mbuf pool <mbuf_pool_socket_0>: n=163456, size=2176, socket=0
testpmd: preferred mempool ops selected: ring_mp_mc
Done
No commandline core given, start packet forwarding
io packet forwarding - ports=0 - cores=0 - streams=0 - NUMA support enabled, MP allocation mode: native

 io packet forwarding packets/burst=32
 nb forwarding cores=2 - nb forwarding ports=0
Press enter to exit