在 SR-IOV 模式下配置 KVM 主机和英特尔网卡 XXV710。在客户虚拟机中配置虚拟功能，但无法从主机访问客户 IP。
Host physical interface : ethtool -i eth1
driver: i40e
version: 2.15.9
firmware-version: 6.02 0x80003888 255.65535.255
expansion-rom-version:
bus-info: 0000:81:00.0
supports-statistics: yes
supports-test: yes
supports-eeprom-access: yes
supports-register-dump: yes
supports-priv-flags: yes
ls -l /sys/class/net/eth1/device/virtfn*
lrwxrwxrwx 1 root root 0 Nov 3 23:50 /sys/class/net/eth1/device/virtfn0 -> ../0000:81:02.0
lrwxrwxrwx 1 root root 0 Nov 3 23:50 /sys/class/net/eth1/device/virtfn1 -> ../0000:81:02.1
ifconfig eth1
eth1 Link encap:Ethernet HWaddr 52:54:00:12:52:FC
inet addr:10.5.136.207 Bcast:10.5.255.255 Mask:255.255.128.0
inet6 addr: fe80::5054:ff:fe12:52fc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5 errors:0 dropped:0 overruns:0 frame:0
TX packets:5 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:322 (322.0 b) TX bytes:362 (362.0 b)
[root@oak-cs849-vcs15 ~]# ping 10.5.136.207
PING 10.5.136.207 (10.5.136.207) 56(84) bytes of data.
64 bytes from 10.5.136.207: icmp_seq=1 ttl=64 time=0.046 ms
64 bytes from 10.5.136.207: icmp_seq=2 ttl=64 time=0.017 ms
root@oak-cs849:~# ping 10.5.136.207 -I eth1
ping: Warning: source address might be selected on device other than: eth1
PING 10.5.136.207 (10.5.136.207) from 10.5.69.61 eth1: 56(84) bytes of data.