fearful-symmetry / gomsr Goto Github PK

package main

import (
    "fmt"
    "github.com/fearful-symmetry/gomsr"
    "os"
)

func main() {
       data, err := gomsr.ReadMSR(0, 0x4b564d03)
       if err != nil {
        fmt.Println("FAILED: ", err)
        os.Exit(1)
       }
       fmt.Println(data)
}

[ec2-user@ip-172-31-43-88 ~]$ sudo ./main
FAILED input/output error

[ec2-user@ip-172-31-43-88 ~]$ cat /proc/stat | grep "cpu " | awk '{print $9}'
1439

[ec2-user@ip-172-31-43-88 ~]$ sudo strace ./rdmsr --all 0x4b564d03
execve("./rdmsr", ["./rdmsr", "--all", "0x4b564d03"], 0x7fff32f797e0 /* 18 vars */) = 0
brk(NULL)                               = 0x55fd18c09000
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
fstat(3, {st_mode=S_IFREG|0644, st_size=23644, ...}) = 0
mmap(NULL, 23644, PROT_READ, MAP_PRIVATE, 3, 0) = 0x7f475a172000
close(3)                                = 0
openat(AT_FDCWD, "/lib64/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
read(3, "\177ELF\2\1\1\3\0\0\0\0\0\0\0\0\3\0>\0\1\0\0\0@\21\2\0\0\0\0\0"..., 832) = 832
fstat(3, {st_mode=S_IFREG|0755, st_size=2021312, ...}) = 0
mmap(NULL, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f475a170000
mmap(NULL, 3844768, PROT_READ|PROT_EXEC, MAP_PRIVATE|MAP_DENYWRITE, 3, 0) = 0x7f4759baa000
mprotect(0x7f4759d4b000, 2097152, PROT_NONE) = 0
mmap(0x7f4759f4b000, 24576, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_DENYWRITE, 3, 0x1a1000) = 0x7f4759f4b000
mmap(0x7f4759f51000, 15008, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x7f4759f51000
close(3)                                = 0
arch_prctl(ARCH_SET_FS, 0x7f475a171500) = 0
mprotect(0x7f4759f4b000, 16384, PROT_READ) = 0
mprotect(0x55fd1821e000, 4096, PROT_READ) = 0
mprotect(0x7f475a178000, 4096, PROT_READ) = 0
munmap(0x7f475a172000, 23644)           = 0
open("/dev/cpu", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
fstat(3, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
brk(NULL)                               = 0x55fd18c09000
brk(0x55fd18c2a000)                     = 0x55fd18c2a000
brk(NULL)                               = 0x55fd18c2a000
getdents(3, /* 3 entries */, 32768)     = 72
getdents(3, /* 0 entries */, 32768)     = 0
close(3)                                = 0
openat(AT_FDCWD, "/dev/cpu/0/msr", O_RDONLY) = 3
pread64(3, 0x7ffd42e78a38, 8, 1263947011) = -1 EIO (Input/output error)
write(2, "rdmsr: CPU 0 cannot read MSR 0x4"..., 40rdmsr: CPU 0 cannot read MSR 0x4b564d03
) = 40
exit_group(4)                           = ?
+++ exited with 4 +++