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MSR(4)                                                                  Linux Programmer's Manual                                                                 MSR(4)

NAME
       msr - x86 CPU MSR access device

DESCRIPTION
       /dev/cpu/CPUNUM/msr  provides  an  interface  to  read and write the model-specific registers (MSRs) of an x86 CPU.  CPUNUM is the number of the CPU to access as
       listed in /proc/cpuinfo.

       The register access is done by opening the file and seeking to the MSR number as offset in the file, and then reading or writing in chunks of 8  bytes.   An  I/O
       transfer of more than 8 bytes means multiple reads or writes of the same register.

       This file is protected so that it can be read and written only by the user root, or members of the group root.

NOTES
       The msr driver is not auto-loaded.  On modular kernels you might need to use the following command to load it explicitly before use:

           $ modprobe msr

SEE ALSO
       Intel Corporation Intel 64 and IA-32 Architectures Software Developer's Manual Volume 3B Appendix B, for an overview of the Intel CPU MSRs.

Linux                                                                          2021-03-22                                                                         MSR(4)