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Most of docs/barrier.txt is describing the protocol implemented by the input-barrier device. Move this into the interop section of the manual, and rstify it. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Laurent Vivier <laurent@vivier.eu> Message-id: 20210727204112.12579-2-peter.maydell@linaro.org