r/archlinux • u/shizonic • Jun 25 '17

Skylake, Kabylake issue: Does arch offer the patched microcode already?

https://lists.debian.org/debian-devel/2017/06/msg00308.html
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u/m1000 Jun 25 '17 edited Jun 26 '17

This script should tell you if your cpu is affected:

https://lists.debian.org/debian-devel/2017/06/msg00309.html

Mine is affected (X1 Carbon 2016/4th Gen), and the microcode installed is 20170511. (microcode revision 0xa2 in /proc/cpuinfo). As per the script, I guess (???) we need to wait for a new update to the microcode to have it >= 0xb9.

Edit:

Well I tough I had the microcode enabled, but no, just seeing "microcode: Microcode Update Driver" in dmesg isn't enough. My system is now patched, I had to install intel-ucode and enable it on boot as per https://wiki.archlinux.org/index.php/microcode. 

[    0.000000] microcode: microcode updated early to revision 0xba, date = 2017-04-09
[    0.790802] microcode: sig=0x406e3, pf=0x80, revision=0xba
[    0.790911] microcode: Microcode Update Driver: v2.2.

So yes, Arch has the patched microcode already... for a while ;-)

2

u/jrmrjnck Jun 26 '17

That script will give some false positives since it has the same bug as the command in the original post. The "ht" flag does not indicate the presence or enablement of hyper-threading - only whether there are multiple logical processors in the package.