Filter MSR writes from user-space by default, and print a syslog entry if

they happen outside the allowed set of MSRs, which is a single one for now,
MSR_IA32_ENERGY_PERF_BIAS.

The plan is to eventually disable MSR writes by default (they can still be
enabled via allow_writes=on).

Signed-off-by: Ingo Molnar <mingo@kernel.org>
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