gomsr

gomsr is a library for reading from and writing to MSRs. It'll work on any linux machine that supports the msr kernel module. It also supports setting a custom character device location, allowing gomsr to work with utilities such as msr-safe.

A quick and dirty check to see if this will work on your system:

$ ls /dev/cpu/0/msr
/dev/cpu/0/msr

# on some systems, you might need to do this first
$ sudo modprobe msr

This library is a new WIP, and breaking changes should be expected.

Usage

gomsr has no dependencies, and is super easy to use:

//0x198 is IA32_PERF_STATUS on most Intel CPUs

//ReadMSR() takes a CPU and an MSR address
data, err := ReadMSR(0, 0x198)
if err != nil {
	log.Fatalf("Error: %s", err)
}

//You can also write to MSRs
err := WriteMSR(0, 0x401, 0)
if err != nil {
	log.Fatalf("Error: %s", err)
}

//You can also create an msr handler. This is suited for repeated reads/writes

//the MSR() init function just takes a CPU
msr, err := MSR(0)
if err != nil {
	log.Fatalf("Error: %s", err)
}

data, err := msr.Read(0x610)
if err != nil {
	log.Fatalf("Error: %s", err)
}
fmt.Printf("Got 0x%x\n", data)

msr.Close()