/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 only be read and written by the
user root, or members of the group root.
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
Intel Corporation Intel 64 and IA-32 Architectures Software Developer's
Manual Volume 3B Appendix B for an overview of the Intel CPU MSRs.
This page is part of release 3.35 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://man7.org/linux/man-pages/.
Linux 2009-03-31 MSR(4)
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