On Wed, Sep 28, 2016 at 02:08:15PM +0100, Daniel P. Berrange wrote: > If the ftrace backend is compiled into QEMU, any attempt > to start QEMU while non-root will fail due to the > inability to open /sys/kernel/debug/tracing/trace_on.
s/trace_on/tracing_on/ > > Add a fallback into the code so that it connects up the > trace_marker_fd variable to /dev/null when setting > EACCESS on the 'trace_on' file. This allows QEMU to > run, with ftrace turned into a no-op. I wonder whether a warning is appropriate. It depends on the situation because maybe QEMU was compiled with multiple backends and we don't care about ftrace when it fails to initialize... Stefan
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