linux-kernel - [PATCH v5 0/7] x86: Support for Intel Microcode Staging Feature

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Message-ID: <20250823155214.17465-1-chang.seok.bae@intel.com>
Date: Sat, 23 Aug 2025 08:52:03 -0700
From: "Chang S. Bae" <chang.seok.bae@...el.com>
To: linux-kernel@...r.kernel.org
Cc: x86@...nel.org,
	tglx@...utronix.de,
	mingo@...hat.com,
	bp@...en8.de,
	dave.hansen@...ux.intel.com,
	chao.gao@...el.com,
	abusse@...zon.de,
	chang.seok.bae@...el.com
Subject: [PATCH v5 0/7] x86: Support for Intel Microcode Staging Feature

Hi all,

This is another iteration -- changes since v4 [*]:

  * Reworked the preparatory change before referencing
    cpu_primary_thread_mask, based on Dave’s feedback. This is now patch1.

  * Incorporated further feedback from Dave on the staging code, mainly
    to improve clarity, reduce ambiguity, and fix minor issues. Each
    patch includes some details.

  * Collected Chao’s review tag (thanks!) for the first and last patches.

As usual, the series is also available here:
  git://github.com/intel-staging/microcode.git staging_v5

[*] https://lore.kernel.org/lkml/20250813172649.15474-1-chang.seok.bae@intel.com/

Thanks,
Chang

Chang S. Bae (7):
  x86/cpu/topology: Make primary thread mask available with SMP=n
  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          |  12 +-
 arch/x86/kernel/cpu/microcode/core.c     |  11 +
 arch/x86/kernel/cpu/microcode/intel.c    | 386 +++++++++++++++++++++++
 arch/x86/kernel/cpu/microcode/internal.h |   4 +-
 arch/x86/kernel/cpu/topology.c           |   4 -
 arch/x86/kernel/cpu/topology_common.c    |   3 +
 arch/x86/kernel/smpboot.c                |   3 -
 8 files changed, 418 insertions(+), 14 deletions(-)


base-commit: 7182bf4176f93be42225d2ef983894febfa4a1b1
-- 
2.48.1