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We implement tracing, following uftrace format. Trace is flushed every 32 MB, so file operations don't impact performance at runtime. A different trace is generated per cpu, and we ensure they have a unique name, based on vcpu_index, while keeping room for privilege level coming in next commit. Uftrace format is not officially documented, but it can be found here: https://github.com/namhyung/uftrace/blob/v0.18/libmcount/record.c#L909 Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org> Signed-off-by: Pierrick Bouvier <pierrick.bouvier@linaro.org> Message-ID: <20250902075042.223990-5-pierrick.bouvier@linaro.org> Signed-off-by: Alex Bennée <alex.bennee@linaro.org> Message-ID: <20250922093711.2768983-21-alex.bennee@linaro.org>