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While using new non arhitectural features using PUNIT Mailbox and MMIO read/write interface, still there is need to operate using MSRs to control PUNIT. User space could have used user user-space MSR interface for this, but when user space MSR access is disabled, then it can't. Here only limited number of MSRs are allowed using this new interface. Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>