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The existing implementation using start/end_exclusive does not provide atomicity across processes. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Richard Henderson <richard.henderson@linaro.org> Message-Id: <20220323005839.94327-3-richard.henderson@linaro.org> Signed-off-by: Laurent Vivier <laurent@vivier.eu>