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vhost-user: Fix backends without multiqueue support 

dev->max_queues was never initialised for backends that don't support
VHOST_USER_PROTOCOL_F_MQ, so it would use 0 as the maximum number of
queues to check against and consequently fail for any such backend.

Set it to 1 if the backend doesn't have multiqueue support.

Fixes: c90bd505a3
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-Id: <20210705171429.29286-1-kwolf@redhat.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2021-07-05 19:14:29 +02:00
parent 6d2f38eb0e
commit 84affad1fd
1 changed files with 3 additions and 0 deletions
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3
hw/virtio/vhost-user.c
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@ -1913,7 +1913,10 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque,
if (err < 0) {
return -EPROTO;
}
} else {
dev->max_queues = 1;
}
if (dev->num_queues && dev->max_queues < dev->num_queues) {
error_setg(errp, "The maximum number of queues supported by the "
"backend is %" PRIu64, dev->max_queues);