Serge, looks like we need to be careful with those two. At least one of them:
  "bridge: only expire the mdb entry when query is received"
was reverted with 3.12. The commit message looks a bit like they might have 
packed several reverts into one. And it references
"bridge: disable snooping if there is no querier" as the one making the 
reverted stuff obsolete.

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  KVM virbr# no longer forwards multicast traffic by default (U12.04)

Status in “libvirt” package in Ubuntu:
  Fix Released
Status in “linux” package in Ubuntu:
Status in “libvirt” source package in Precise:
Status in “linux” source package in Precise:

Bug description:
  A recent kernel update (Apr 2013) has made it's way to U12.04.2 LTS
  (approx June-Aug 2013) and has stopped the (default) behaviour of
  automatically forwarding multicast traffic over virbr#.  Some updates
  the bridge subsystem now, by default, disable multicast traffic
  without IGMP Querier being enabled on that bridge.

  The corresponding Fedora/RHEL bug tracks the progress/updates of this 
specific change in relation to Fedora.

  (I have yet to find a similar bug report in Ubuntu so I have created
  this bug to help the Ubuntu community identify multicast issues that
  may arise since April 2013 in U12.04 LTS and presumably other Ubuntu
  releases as backports are made and break regression testing.)

  Using the latest patches in U12.04.2 LTS this following addition, with some 
modifications, can be made to the udev rules will enable multicast on virbr# 

  While this is an improvement/correction to KVM bridge networking it
  has broken existing functionality in U12.04.2 LTS and broke regressed
  functionality that once worked.

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