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include/hw: document vhost_dev feature life-cycle 

Try and explicitly document the various state of feature bits as
related to the vhost_dev structure. Importantly the backend_features
can advertise things like VHOST_USER_F_PROTOCOL_FEATURES which is
never exposed to the driver and is only present in the vhost-user
feature negotiation.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Jason Wang <jasowang@redhat.com>
Message-Id: <20220802095010.3330793-7-alex.bennee@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
This commit is contained in:
Alex Bennée 2022-08-02 10:49:54 +01:00 committed by Michael S. Tsirkin
parent ea5d6ea778
commit c7066f2d30
1 changed files with 3 additions and 0 deletions
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include/hw/virtio/vhost.h
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@ -86,8 +86,11 @@ struct vhost_dev {
/* if non-zero, minimum required value for max_queues */
int num_queues;
uint64_t features;
/** @acked_features: final set of negotiated features */
uint64_t acked_features;
/** @backend_features: backend specific feature bits */
uint64_t backend_features;
/** @protocol_features: final negotiated protocol features */
uint64_t protocol_features;
uint64_t max_queues;
uint64_t backend_cap;