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Commit id 'b00d7f29' shifted the opening of the /sys/devices/intel_cqm/type file from event enable to perf event initialization. If the file did not exist, then an error would be written to the domain log: 2016-09-06 20:51:21.677+0000: 7310: error : virFileReadAll:1360 : Failed to open file '/sys/devices/intel_cqm/type': No such file or directory Since the error is now handled in virPerfEventEnable by checking if the event_attr->attrType == 0 for CMT, MBML, and MBMT events - we can just use the Quiet API in order to not log the error we're going to throw away. Additionally, rather than using virReportSystemError, use virReportError and VIR_ERR_ARGUMENT_UNSUPPORTED in order to signify that support isn't there for that type of perf event - adjust the error message as well.
LibVirt : simple API for virtualization
Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.
Daniel Veillard <veillard@redhat.com>