linux-kernel - [PATCH v4 0/6] x86: Support for Intel Microcode Staging Feature

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Message-ID: <20250813172649.15474-1-chang.seok.bae@intel.com>
Date: Wed, 13 Aug 2025 10:26:43 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: x86@...nel.org
Cc: tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	colinmitchell@...gle.com,
	chao.gao@...el.com,
	abusse@...zon.de,
	chang.seok.bae@...el.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4 0/6] x86: Support for Intel Microcode Staging Feature

Dear x86 maintainers,

This is another posting of the series, now including a Tested-by tag.
There are no code changes.

The use case for this feature is late-loading with increased load times,
most likely in cloud service environments. I reached out to potential
users for reviews and feedback, and Anselm Busse has confirmed his
testing.

While additional reviews or endorsements could help ease the maintainers'
burden and build confidence, there hasn't been much recent traction. At
this point, I believe it's better to move forward and get a clear
assessment from the maintainers -- either to prompt more engagement from
prospective users or to determine its readiness for merging.

Of course, I appreciate any further feedback on this set.

As usual, the patch series is based on tip/master and is also available
in this repo:
  git://github.com/intel-staging/microcode.git staging_v4

Last posting (V3):
  https://lore.kernel.org/lkml/20250409232713.4536-1-chang.seok.bae@intel.com/

Thanks,
Chang

Chang S. Bae (6):
  x86/microcode: Introduce staging step to reduce late-loading time
  x86/microcode/intel: Establish staging control logic
  x86/microcode/intel: Define staging state struct
  x86/microcode/intel: Implement staging handler
  x86/microcode/intel: Support mailbox transfer
  x86/microcode/intel: Enable staging when available

 arch/x86/include/asm/msr-index.h         |   9 +
 arch/x86/include/asm/topology.h          |   1 +
 arch/x86/kernel/cpu/microcode/core.c     |  11 +
 arch/x86/kernel/cpu/microcode/intel.c    | 338 +++++++++++++++++++++++
 arch/x86/kernel/cpu/microcode/internal.h |   4 +-
 5 files changed, 362 insertions(+), 1 deletion(-)

base-commit: ca76508b9352e8c770b58213cc6c4700e459b7c2
-- 
2.48.1