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NAME | DESCRIPTION | NOTES | SEE ALSO | COLOPHON |
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MSR(4) Linux Programmer's Manual MSR(4)
msr - x86 CPU MSR access device
/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.
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 5.13 of the Linux man-pages project.
A description of the project, information about reporting bugs,
and the latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2021-03-22 MSR(4)
Pages that refer to this page: capabilities(7)
Copyright and license for this manual page
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