[libvirt-users] network bridge hairpin parameter support

[Zang MingJie]

Hi:

   Currently we encounter a problem where OpenStack may forget or 
misconfig the bridge hairpin setting, and will cause some unexpected 
behavior [1]. Although this bug is marked fixed, but if we manually 
restart the vm by virsh will also trigger the problem. And because the 
bridge interface is created and managed by libvirt, we are considering 
move the hairpin configuration to libvirt.

   Now I start writing a patch to achieve this, but after digging into 
the source code, I found only kvm/qemu and uml backend may support this 
parameter. Other backends manage their own bridge, and seems no way to 
modify it.

   I expect is there any solution working in progress or should we add 
the new parameter in libvirt configuration ?

   [1] https://bugs.launchpad.net/nova/+bug/933640