I have the same problem with kernel 4.4.77, ixgbe driver version 5.2.1 and ixgbevf 4.2.1. OS ALT Linux.
Spoof cheking was disabled, but no ping in two VM with the same vlan.
dmesg host:
[162311.173561] ixgbe 0000:05:00.1 eth0: 2 Spoofed packets detected
[162313.177679] ixgbe 0000:05:00.1 eth0: 1 Spoofed packets detected
[162315.181748] ixgbe 0000:05:00.1 eth0: 2 Spoofed packets detected
[162333.211099] ixgbe 0000:05:00.1 eth0: 1 Spoofed packets detected
[162337.217085] ixgbe 0000:05:00.1 eth0: 1 Spoofed packets detected
[162339.220074] ixgbe 0000:05:00.1 eth0: 2 Spoofed packets detected
# ip li show eth0
7: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq master ovs-system state UP mode DEFAULT group default qlen 1000
link/ether a0:36:9f:25:80:5e brd ff:ff:ff:ff:ff:ff
vf 0 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 1 MAC da:55:a4:db:0f:d5, spoof checking off, link-state auto, trust off, query_rss off
vf 2 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 3 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 4 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 5 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 6 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 7 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 8 MAC 9a:1f:86:df:b1:d8, spoof checking off, link-state auto, trust off, query_rss off
vf 9 MAC aa:b7:85:e1:1b:06, spoof checking off, link-state auto, trust off, query_rss off
vf 10 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off
vf 11 MAC 9a:1f:86:df:b1:d8, spoof checking off, link-state auto, trust off, query_rss off
vf 12 MAC aa:b7:85:e1:1b:06, spoof checking off, link-state auto, trust off, query_rss off
vf 13 MAC 00:00:00:00:00:00, spoof checking off, link-state auto, trust off, query_rss off