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Where we can find packstack release notes - to see in which release libvirt was changed

Packstack has nothing to do with which version of libvirt is installed on your system; packstack just asks for the libvirt package and gets whatever yum believes is the latest. If you want to know about libvirt, you can run rpm -q --changelog libvirt to get the package changelog, or you can check out the source from libvirt.org and browse the git changelog.

shall we log a bug in openstack networking documentation

The fact that libvirt natively supports OVS bridges does not have any impact on the use of Linux bridge devices to support security groups. This was due to a Linux kernel limitation that did not permit iptables rules to be associated directly with OVS interfaces.

I don't know whether or not this limitation still exists, but this is a separate issue from libvirt's support of OVS interfaces.

Where we can find packstack release notes - to see in which release libvirt was changed

Packstack has nothing to do with which version of libvirt is installed on your system; packstack just asks for the libvirt package and gets whatever yum believes is the latest. If you want to know about libvirt, you can run rpm -q --changelog libvirt to get the package changelog, or you can check out the source from libvirt.org and browse the git changelog.

shall we log a bug in openstack networking documentation ...

The fact that libvirt natively supports OVS bridges does not have any impact on the use of Linux bridge devices to support security groups. This was due to a Linux kernel limitation that did not permit iptables rules to be associated directly with OVS interfaces.

I don't know whether or not this limitation still exists, but this is a separate issue from libvirt's support of OVS interfaces.