linux-kernel - Re: [virtio-dev] Re: [RFC PATCH 1/1] virtio: write back features before verify

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Date:   Tue, 5 Oct 2021 13:17:51 +0200
From:   Halil Pasic <pasic@...ux.ibm.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Cornelia Huck <cohuck@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Xie Yongji <xieyongji@...edance.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, markver@...ibm.com,
        Christian Borntraeger <borntraeger@...ibm.com>,
        linux-s390@...r.kernel.org, virtio-dev@...ts.oasis-open.org,
        Halil Pasic <pasic@...ux.ibm.com>
Subject: Re: [virtio-dev] Re: [RFC PATCH 1/1] virtio: write back features
 before verify

On Mon, 4 Oct 2021 16:01:12 -0400
"Michael S. Tsirkin" <mst@...hat.com> wrote:

> > 
> > Ok, so what about something like
> > 
> > "If FEATURES_OK is not set, the driver MAY change the set of features it
> > accepts."
> > 
> > in the device initialization section?  
> 
> Maybe "as long as". However Halil implied that some features are not
> turned off properly if that happens. Halil could you pls provide
> some examples?



static void virtio_net_set_features(VirtIODevice *vdev, uint64_t features)
{
...
    if (virtio_has_feature(features, VIRTIO_NET_F_STANDBY)) {
        qapi_event_send_failover_negotiated(n->netclient_name);
        qatomic_set(&n->failover_primary_hidden, false);
        failover_add_primary(n, &err);
        if (err) {
            warn_report_err(err);
        }
    }
}

This is probably the only one in QEMU. Back then I stopped looking
after the first hit.

Regards,
Halil