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[libvirt] [PATCH v4 0/6] nwfilter: refactor the driver to make it independent of virt drivers



 v1: https://www.redhat.com/archives/libvir-list/2018-April/msg02616.html
 v2: https://www.redhat.com/archives/libvir-list/2018-May/msg01145.html
 v3: https://www.redhat.com/archives/libvir-list/2018-June/msg01121.html

Today the nwfilter driver is entangled with the virt drivers in both
directions. At various times when rebuilding filters nwfilter will call
out to the virt driver to iterate over running guest's NICs. This has
caused very complicated lock ordering rules to be required. If we are to
split the virt drivers out into separate daemons we need to get rid of
this coupling since we don't want the separate daemons calling each
other, as that risks deadlock if all of the RPC workers are busy.

The obvious way to solve this is to have the nwfilter driver remember
all the filters it has active, avoiding the need to iterate over running
guests.

Changed in v4:

 - Merged already reviewed patches
 - Correctly handle nwfilter recreate on daemon startup
 - Added virsh docs

Changed in v3:

  - Updated API version numbers
  - Use accessors for virNWFilterBindingObjPtr struct
  - Other fixes John mentioned

Changed in v2:

 - The virNWFilterBindingPtr was renamed virNWFilterBindingDefPtr
 - New virNWFilterBindingObjPtr & virNWFilterBindingObjListPtr
   structs added to track the objects in the driver
 - New virNWFilterBindingPtr  public API type was added
 - New public APIs for listing filter bindings, querying XML, and
   creating/deleting them
 - Convert the virt drivers to use the public API for creating
   and deleting bindings
 - Persistent active bindings out to disk so they're preserved
   across restarts
 - Added RNG schema and XML-2-XML test
 - New virsh commands for listing/querying XML/creating/deleting
   bindings

Daniel P. Berrangé (6):
  virsh: add manpage docs for nwfilter-binding commands.
  nwfilter: keep track of active filter bindings
  nwfilter: remove virt driver callback layer for rebuilding filters
  nwfilter: wire up new APIs for listing and querying filter bindings
  nwfilter: wire up new APIs for creating and deleting nwfilter bindings
  nwfilter: convert virt drivers to use public API for nwfilter bindings

 src/conf/domain_nwfilter.c             | 135 ++++++++++++--
 src/conf/domain_nwfilter.h             |  16 +-
 src/conf/nwfilter_conf.c               | 136 ++------------
 src/conf/nwfilter_conf.h               |  51 +-----
 src/conf/virnwfilterobj.c              |   4 +-
 src/conf/virnwfilterobj.h              |   4 +
 src/libvirt_private.syms               |   8 +-
 src/lxc/lxc_driver.c                   |  28 ---
 src/lxc/lxc_process.c                  |   2 +-
 src/nwfilter/nwfilter_driver.c         | 236 ++++++++++++++++++++-----
 src/nwfilter/nwfilter_gentech_driver.c | 187 ++++++++++----------
 src/nwfilter/nwfilter_gentech_driver.h |   8 +-
 src/qemu/qemu_driver.c                 |  25 ---
 src/qemu/qemu_hotplug.c                |   4 +-
 src/qemu/qemu_interface.c              |   4 +-
 src/qemu/qemu_process.c                |   6 +-
 src/remote/remote_daemon.c             |   1 +
 src/uml/uml_conf.c                     |   2 +-
 src/uml/uml_driver.c                   |  29 ---
 tools/virsh.pod                        |  35 ++++
 20 files changed, 478 insertions(+), 443 deletions(-)

-- 
2.17.1


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