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vhost: Track descriptor chain in private at SVQ
The device could have access to modify them, and it definitely have access when we implement packed vq. Harden SVQ maintaining a private copy of the descriptor chain. Other fields like buffer addresses are already maintained sepparatedly. Signed-off-by: Eugenio Pérez <eperezma@redhat.com> Message-Id: <20220512175747.142058-2-eperezma@redhat.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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