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This commit implemented vdpa_config_ops.get_vq_irq() in ifcvf, and initialized vq irq to -EINVAL. So that ifcvf can report irq number of a vq, or -EINVAL if the vq is not assigned an irq number. Signed-off-by: Zhu Lingshan <lingshan.zhu@intel.com> Suggested-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20200731065533.4144-6-lingshan.zhu@intel.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>