linux-kernel - Re: Old microcode CPU matching issue - x86/microcode/intel: Refresh the revisions that determine old

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Message-ID: <68c8db8e-4420-4cf4-9b30-4ce19e39a280@intel.com>
Date: Thu, 20 Nov 2025 11:27:26 -0800
From: Dave Hansen <dave.hansen@...el.com>
To: Sohil Mehta <sohil.mehta@...el.com>, Jon Kohler <jon@...anix.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>, "x86@...nel.org"
 <x86@...nel.org>, Borislav Petkov <bp@...en8.de>,
 Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>,
 "H . Peter Anvin" <hpa@...or.com>, Peter Zijlstra <peterz@...radead.org>,
 Josh Poimboeuf <jpoimboe@...nel.org>,
 Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
 Nikolay Borisov <nik.borisov@...e.com>,
 Alex Murray <alex.murray@...onical.com>,
 Andrew Cooper <andrew.cooper3@...rix.com>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Old microcode CPU matching issue - x86/microcode/intel: Refresh
 the revisions that determine old_microcode

On 11/20/25 11:13, Sohil Mehta wrote:
> The early loading probably gets affected because intel_get_platform_id()
> relies on boot_cpu_data which isn't initialized when load_ucode_bsp() is
> called very early.

Good point, and thanks for finding those bugs!

We can probably just move back to building the vfm value from CPUID
directly as opposed to reading it from boot_cpu_data.