[Libvirt failed to claim Virtual Functions on hostdev network after VM reboot]

Fuzail Ahmad <fuzail.nitkkr@xxxxxxxxx> · Thu, 23 May 2019 22:37:56 +0530

Problem Statement:
Libvirt failed to claim Virtual Functions  on hostdev network after VM reboot.Version-Release number of selected component (if applicable):
libvirtd (libvirt) 2.0.0
kernel-4.1.12-112.16.4.el7uek.x86_64
Reproducible: Not always

Description:
I am doing a reboot of Virtual machines and sometimes one of the VM does not start and fail with the following error
In total I have spun 3 VMs out of which 2 gets started and 1 of them fail with the below error.
[root@sriov2 ~]# virsh start VM3
error: Failed to attach interface
error: internal error: network 'hostnet' requires exclusive access to interfaces, but none are available
              [root@sriov2 ~]# virsh net-dumpxml hostnet
<network connections='2'>
  <name>hostnet</name>
  <uuid>c1fb4ead-21b8-4d69-8ad9-669c55b3dfc7</uuid>
  <forward mode='hostdev' managed='yes'>
    <address type='pci' domain='0x0000' bus='0x0f' slot='0x10' function='0x0'/>
    <address type='pci' domain='0x0000' bus='0x0f' slot='0x10' function='0x2'/>
  </forward>
</network>

However, "ip link show" command shows 8 VFs in total.
# ip link show ens2
 ens2: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 9000 qdisc mq state UP mode DEFAULT qlen 1000
    link/ether 00:0a:f7:d5:a7:50 brd ff:ff:ff:ff:ff:ff
    vf 0 MAC 52:54:00:6d:7c:a0, spoof checking off, link-state auto
    vf 1 MAC 52:54:00:44:c9:b6, spoof checking off, link-state auto
    vf 2 MAC 52:54:00:30:7a:86, spoof checking off, link-state auto
    vf 3 MAC c6:9a:1b:82:90:ea, spoof checking off, link-state auto
    vf 4 MAC 46:db:e2:33:c7:a4, spoof checking off, link-state auto
    vf 5 MAC 76:65:e1:f7:82:78, spoof checking off, link-state auto
    vf 6 MAC 8e:a0:8b:e5:1a:66, spoof checking off, link-state auto
    vf 7 MAC ba:f4:83:19:80:bf, spoof checking off, link-state auto
#
Please, letme know if I need to attach any additional information.

Regards
Fuzail

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