linux-kernel - [PATCH v2 0/4] Add VHOST_BACKEND_F_ENABLE_AFTER_DRIVER

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Date:   Fri,  9 Jun 2023 11:21:23 +0200
From:   Eugenio Pérez <eperezma@...hat.com>
To:     mst@...hat.com, Jason Wang <jasowang@...hat.com>
Cc:     Zhu Lingshan <lingshan.zhu@...el.com>,
        virtualization@...ts.linux-foundation.org,
        "Gonglei (Arei)" <arei.gonglei@...wei.com>, longpeng2@...wei.com,
        Lei Yang <leiyang@...hat.com>,
        Parav Pandit <parav@...lanox.com>,
        Gautam Dawar <gdawar@...inx.com>,
        Dragos Tatulea <dtatulea@...dia.com>,
        Laurent Vivier <lvivier@...hat.com>, linux-api@...r.kernel.org,
        Liuxiangdong <liuxiangdong5@...wei.com>,
        linux-kernel@...r.kernel.org, alvaro.karsz@...id-run.com,
        Shannon Nelson <snelson@...sando.io>,
        Stefano Garzarella <sgarzare@...hat.com>,
        Cindy Lu <lulu@...hat.com>, si-wei.liu@...cle.com,
        Harpreet Singh Anand <hanand@...inx.com>
Subject: [PATCH v2 0/4] Add VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK flag to vdpa backend

To migrate vDPA-net device state though CVQ we need to start the dataplane
after the control virtqueue.

As vdpa frontend doesn't know if the parent vdpa driver supports it, let's
allow them to expose custom backend features by themselves.

Comments are welcome.

Thanks!

v2: address doc issues from checkpath and fix lack of signed-off-by.

v1: from RFC: Tweak doc as Shannon suggestion.

Eugenio Pérez (4):
  vdpa: add VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK flag
  vdpa: accept VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK backend feature
  vdpa: add get_backend_features vdpa operation
  vdpa_sim: offer VHOST_BACKEND_F_ENABLE_AFTER_DRIVER_OK

 drivers/vdpa/vdpa_sim/vdpa_sim.c |  8 ++++++++
 drivers/vhost/vdpa.c             | 15 ++++++++++++++-
 include/linux/vdpa.h             |  4 ++++
 include/uapi/linux/vhost_types.h |  4 ++++
 4 files changed, 30 insertions(+), 1 deletion(-)

-- 
2.31.1