linux-kernel - Re: [PATCH 1/2] x86/microcode/intel: Refresh the revisions that determine old

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Message-ID: <0bfc7329-e13b-4781-a331-9f8898110b5f@citrix.com>
Date: Tue, 19 Aug 2025 12:18:45 +0100
From: Andrew Cooper <andrew.cooper3@...rix.com>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>,
 Sohil Mehta <sohil.mehta@...el.com>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>, 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>,
 Dave Hansen <dave.hansen@...el.com>, Nikolay Borisov <nik.borisov@...e.com>,
 Alex Murray <alex.murray@...onical.com>, linux-kernel@...r.kernel.org,
 stable@...nel.org
Subject: Re: [PATCH 1/2] x86/microcode/intel: Refresh the revisions that
 determine old_microcode

On 19/08/2025 6:19 am, Pawan Gupta wrote:
> On Mon, Aug 18, 2025 at 12:01:36PM -0700, Sohil Mehta wrote:
>> Update the minimum expected revisions of Intel microcode based on the
>> microcode-20250512 (May 2025) release.
>>
>> Cc: <stable@...nel.org> # v6.15+
>> Signed-off-by: Sohil Mehta <sohil.mehta@...el.com>
>> ---
>>  .../kernel/cpu/microcode/intel-ucode-defs.h   | 86 +++++++++++--------
>>  1 file changed, 48 insertions(+), 38 deletions(-)
>>
>> diff --git a/arch/x86/kernel/cpu/microcode/intel-ucode-defs.h b/arch/x86/kernel/cpu/microcode/intel-ucode-defs.h
>> index cb6e601701ab..2d48e6593540 100644
>> --- a/arch/x86/kernel/cpu/microcode/intel-ucode-defs.h
>> +++ b/arch/x86/kernel/cpu/microcode/intel-ucode-defs.h
>> @@ -67,9 +67,8 @@
>>  { .flags = X86_CPU_ID_FLAG_ENTRY_VALID, .vendor = X86_VENDOR_INTEL, .family = 0x6,  .model = 0x55, .steppings = 0x0008, .driver_data = 0x1000191 },
>>  { .flags = X86_CPU_ID_FLAG_ENTRY_VALID, .vendor = X86_VENDOR_INTEL, .family = 0x6,  .model = 0x55, .steppings = 0x0010, .driver_data = 0x2007006 },
>>  { .flags = X86_CPU_ID_FLAG_ENTRY_VALID, .vendor = X86_VENDOR_INTEL, .family = 0x6,  .model = 0x55, .steppings = 0x0020, .driver_data = 0x3000010 },
>> -{ .flags = X86_CPU_ID_FLAG_ENTRY_VALID, .vendor = X86_VENDOR_INTEL, .family = 0x6,  .model = 0x55, .steppings = 0x0040, .driver_data = 0x4003605 },
> ".model = 0x55, .steppings = 0x0040" is being removed? Total number of
> entries in the table are being reduced by ~10.

That's because early in a CPUs lifecycle, microcode for the late
pre-production steppings are still included in the public repo, but
eventually dropped.

Alas, these deletions are documented as well as everything else is in
the changelog...

~Andrew