[RFC 0/3] Drop vhost async (DMA-accelerated) datapath

[David Marchand <david.marchand@redhat.com>]

The integration of this feature in OVS has been postponed following
feedback how the current API forced the complexity on the application
side. There is no contributor working on making those changes.

The feature has no other identified opensource consumer.

On the other hand, this feature has been left unattended for some years
now while the "normal" datapath is actively maintained.
It is highly likely the async datapath code, which never underwent a
stabilisation phase, is riddled with bugs.

Given the craziness around finding security bugs with AI,
and since the vhost library is a good target, I propose to drop
this feature and reduce the library attack surface.


-- 
David Marchand

David Marchand (3):
  examples: stop using vhost async datapath
  vhost: refuse async datapath
  vhost: drop async datapath

 doc/guides/prog_guide/vhost_lib.rst    |  151 +-
 doc/guides/rel_notes/release_26_11.rst |   20 +
 examples/vhost/Makefile                |    2 -
 examples/vhost/main.c                  |  436 +---
 examples/vhost/main.h                  |   21 +-
 examples/vhost/meson.build             |    2 -
 examples/vhost_crypto/Makefile         |    1 -
 examples/vhost_crypto/main.c           |    3 +-
 examples/vhost_crypto/meson.build      |    1 -
 lib/vhost/meson.build                  |    3 +-
 lib/vhost/rte_vhost.h                  |    2 +-
 lib/vhost/rte_vhost_async.h            |  293 ---
 lib/vhost/socket.c                     |   27 +-
 lib/vhost/vhost.c                      |  434 ----
 lib/vhost/vhost.h                      |  115 -
 lib/vhost/vhost_user.c                 |  215 +-
 lib/vhost/virtio_net.c                 | 3275 +++++-------------------
 17 files changed, 708 insertions(+), 4293 deletions(-)
 delete mode 100644 lib/vhost/rte_vhost_async.h

-- 
2.54.0