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When the "simple" backend is not active but the "log" backend is, both "-trace file=" and "-D" will result in a call to qemu_set_log_filename. Unfortunately, QEMU was also calling qemu_set_log_filename if "-D" was not passed, so the "-trace file=" option had no effect and the tracepoints went back to stderr. Fortunately we can just skip qemu_set_log_filename in that case, because the log backend will initialize itself just fine as soon as qemu_set_log is called, also in qemu_process_early_options. Cc: stefanha@redhat.com Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Message-Id: <20210209145759.141231-3-pbonzini@redhat.com>