virtio: add and use virtio_set_features
vdev->guest_features is not masking features that are not supported by the guest. Fix this by introducing a common wrapper to be used by all virtio bus implementations. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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