[Qemu-devel] Re: [PATCH RFC] virtio: add features qdev property

[Gerd Hoffmann]

   -device 'virtio-blk-pci,disable=blk-identify|ring-indirect'

The driver will just do 'vdev->host_features&= ~disable'.

cheers,
   Gerd

Is there an example of an existing property that is like this?

No.  A new property type is needed for this.

cheers,
  Gerd