Model-specific registers

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Resources

Official documentation

Model-specific registers are processor registers in the x86 system architecture that can be used for debugging, monitoring, and toggling of features.

Kernel

To enable access to MSRs in the kernel:

KERNEL menuconfig

Processor type and features  --->
    <*> /dev/cpu/*/msr - Model-specific register support

Note that enabling either of the kernel lockdown modes requires disabling access to MSRs.

External resources

• https://en.wikipedia.org/wiki/Control_register
• https://wiki.osdev.org/Model_Specific_Registers
• x86 architecture model specific registers
• Intel® 64 and IA-32 Architectures Software Developer’s Manual, Volume 4: Model-Specific Registers