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This patch enables sending CVQ state load commands in parallel at device startup by following steps: * Refactor vhost_vdpa_net_load_cmd() to iterate through the control commands shadow buffers. This allows different CVQ state load commands to use their own unique buffers. * Delay the polling and checking of buffers until either the SVQ is full or control commands shadow buffers are full. Resolves: https://gitlab.com/qemu-project/qemu/-/issues/1578 Signed-off-by: Hawkins Jiawei <yin31149@gmail.com> Acked-by: Eugenio Pérez <eperezma@redhat.com> Message-Id: <9350f32278e39f7bce297b8f2d82dac27c6f8c9a.1697165821.git.yin31149@gmail.com> Reviewed-by: Michael S. Tsirkin <mst@redhat.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>