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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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echo $(($(rdmsr -c 0xc0011029) & (1<<9) ))
Should return 512. You might need a ‘sudo’ before the rdmsr (any permission errors in any of this means it didn’t work). Unfortunately, this needs to be done every time you reboot. The next security update for linux will do this automatically.
Thanks, it works. That's a bit worrying.
Do you think Ubuntu 22.04 will get the security update soon? I got a microcode update today but i think that's only a fix for server cpus and not desktop cpus.
For anyone having permission problems turn off secure boot in order for this to work.
Microcode fixes the issue as of 3 days ago
I thought that was only for Eypc processors with desktop processor fixes coming later this year. The articles are not very clear with what is fixed when.
I also read that fixes are being released now for the high-end chips, but the desktop fixes will be released significantly later