[PATCH v2 1/2] vhost: add logging mechanism for reconnection

[David Marchand]

On Fri, Sep 20, 2024 at 11:09 AM Maxime Coquelin
<maxime.coquelin at redhat.com> wrote:
>
> This patch introduces a way for backend to keep track
> of the needed information to be able to reconnect without
> frontend cooperation.
>
> It will be used for VDUSE, which does not provide interface
> for the backend to save and later recover local virtqueues
> metadata needed to reconnect.
>
> Vhost-user support could also be added for improved packed
> ring reconnection support.
>
> Signed-off-by: Maxime Coquelin <maxime.coquelin at redhat.com>

vq->last_avail_idx gets updated in other places and I suspect we are
missing some calls to vhost_virtqueue_reconnect_log_split/packed.
I spotted:
- lib/vhost/vhost.c: rte_vhost_set_vring_base()
- lib/vhost/vhost_user.c:  translate_ring_addresses(),
vhost_user_set_vring_base().

The rest lgtm.


-- 
David Marchand