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This patch introduces a new method in the vdpa_config_ops which reports the physical address and the size of the doorbell for a specific virtqueue. This will be used by the future patches that maps doorbell to userspace. Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200529080303.15449-4-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>