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Re: Is the CPU microcode updated?

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On Tue, Sep 24, 2024 at 6:38 PM Franco Martelli <martellif67@gmail.com> wrote:
>
> Hi everyone,
>
> In the latest Debian's minor update (12.7) it was updated the
> "amd64-microcode" package, during the update process a message that it
> said: "The cpu microcode will be updated at the next reboot" was showed.
>
> The issue is that I'm running an homemade Kernel image that it had the
> CONFIG_MICROCODE_AMD item disabled by me mistakenly, so I'm not sure
> that the microcode of my CPU was updated. Of course I've rebuild and
> installed a new kernel with that item enabled before rebooting.
>
> I've read the lscpu's man-page but I didn't find anything about the CPU
> microcode version, the following command shows:
>
> $ cat /proc/cpuinfo | grep microcode | head -1
> microcode       : 0x6000822
>
> the value returned is from an updated microcode? How can I verify that
> the microcode was updated or not?

I think the microcode can be updated at three different times in the
boot sequence. See
<https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/best-practices/microcode-update-guidance.html>.

Jeff

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Thread

Is the CPU microcode updated? Franco Martelli <martellif67@gmail.com> - 2024-09-24 21:40 +0200
  Re: Is the CPU microcode updated? Jeffrey Walton <noloader@gmail.com> - 2024-09-25 01:00 +0200
    Re: Is the CPU microcode updated? Franco Martelli <martellif67@gmail.com> - 2024-09-25 17:10 +0200
  Re: Is the CPU microcode updated? Jörg-Volker Peetz <jvpeetz@web.de> - 2024-09-25 15:00 +0200
    Re: Is the CPU microcode updated? Franco Martelli <martellif67@gmail.com> - 2024-09-25 17:10 +0200
      Re: Is the CPU microcode updated? Dan Ritter <dsr@randomstring.org> - 2024-09-25 18:40 +0200
        Re: Is the CPU microcode updated? Franco Martelli <martellif67@gmail.com> - 2024-09-25 21:40 +0200
          Re: Is the CPU microcode updated? Dan Ritter <dsr@randomstring.org> - 2024-09-25 22:10 +0200
          Re: Is the CPU microcode updated? Michel Verdier <mv524@free.fr> - 2024-09-26 10:40 +0200
            Re: Is the CPU microcode updated? Franco Martelli <martellif67@gmail.com> - 2024-09-26 15:40 +0200
      Re: Is the CPU microcode updated? Jörg-Volker Peetz <jvpeetz@web.de> - 2024-09-26 15:00 +0200
        Re: Is the CPU microcode updated? Henrik Ahlgren <pablo@seestieto.com> - 2024-09-27 09:50 +0200
        objtool errors message while compiling the Kernel (was: Is the CPU  microcode updated?) Franco Martelli <martellif67@gmail.com> - 2024-09-27 15:20 +0200

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