On Fri, Jun 6, 2025 at 7:46 PM Paolo Abeni [off-list ref] wrote:

Use the extended feature type for 'acked_features' and implement
two new ioctls operation allowing the user-space to set/query an
unbounded amount of features.

The actual number of processed features is limited by VIRTIO_FEATURES_MAX
and attempts to set features above such limit fail with
EOPNOTSUPP.

Note that: the legacy ioctls implicitly truncate the negotiated
features to the lower 64 bits range and the 'acked_backend_features'
field don't need conversion, as the only negotiated feature there
is in the low 64 bit range.

Signed-off-by: Paolo Abeni <pabeni@redhat.com>
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Acked-by: Jason Wang <redacted>

Thanks