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docs: vhost-user: add Virtio status protocol feature 

This patch specifies the VHOST_USER_SET_STATUS and
VHOST_USER_GET_STATUS requests, which are sent by
the master to update and query the Virtio status
in the backend.

Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Message-Id: <20200618134501.145747-1-maxime.coquelin@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Maxime Coquelin 2020-06-18 15:45:01 +02:00 committed by Michael S. Tsirkin
parent 3e1dc4d55e
commit 553dc662bb
1 changed files with 24 additions and 0 deletions
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docs/interop/vhost-user.rst
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@ -816,6 +816,7 @@ Protocol features
#define VHOST_USER_PROTOCOL_F_RESET_DEVICE 13
#define VHOST_USER_PROTOCOL_F_INBAND_NOTIFICATIONS 14
#define VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS 15
#define VHOST_USER_PROTOCOL_F_STATUS 16
Master message types
--------------------
@ -1307,6 +1308,29 @@ Master message types
``VHOST_USER_ADD_MEM_REG`` message, this message is used to set and
update the memory tables of the slave device.
``VHOST_USER_SET_STATUS``
:id: 39
:equivalent ioctl: VHOST_VDPA_SET_STATUS
:slave payload: N/A
:master payload: ``u64``
When the ``VHOST_USER_PROTOCOL_F_STATUS`` protocol feature has been
successfully negotiated, this message is submitted by the master to
notify the backend with updated device status as defined in the Virtio
specification.
``VHOST_USER_GET_STATUS``
:id: 40
:equivalent ioctl: VHOST_VDPA_GET_STATUS
:slave payload: ``u64``
:master payload: N/A
When the ``VHOST_USER_PROTOCOL_F_STATUS`` protocol feature has been
successfully negotiated, this message is submitted by the master to
query the backend for its device status as defined in the Virtio
specification.
Slave message types
-------------------