It's even better - you just need to change your boot parameters. > This behavior right now can be toggled via the msr.allow_writes= kernel module paramrter wit

It's even better - you just need to change your boot parameters. > This behavior right now can be toggled via the msr.allow_writes= kernel module paramrter with on/off/default. Should legitimate use-cases come up where writes to MSRs from user-space are still desired, they may add the infrastructure to selectively grant/deny access to specific MSRs and ensure they are sanitized by the kernel. Similar hardware restrictions already exists in the kernel, for example, by default the kernel restricts access to I/O memory since it's a dangerous, low-level zone, but if you really need to for some reasons (e.g. reflash your BIOS), you can boot with "iomem=relaxed" to turn it off. Treating MSR registers in the same way is very reasonable.