linux-kernel - [v2 0/3] Patches to address some limitations in OS microcode loading.

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Message-Id: <1519281205-58951-1-git-send-email-ashok.raj@intel.com>
Date:   Wed, 21 Feb 2018 22:33:22 -0800
From:   Ashok Raj <ashok.raj@...el.com>
To:     bp@...e.de
Cc:     Ashok Raj <ashok.raj@...el.com>, X86 ML <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <andi.kleen@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Arjan Van De Ven <arjan.van.de.ven@...el.com>
Subject: [v2 0/3] Patches to address some limitations in OS microcode loading.

Patch series to address limitations of OS microcode loading.

Review comments from Boris:

Changes since v1: Patch 1/3
- Check for revision to avoid duplicate microcode load in early load
- Added inline comments.

Changes since v1: Patch 2/3
- Change to native_wbinvd for early load.

Changes since v1: Patch 3/3
- Check for return code of stop_machine
- When microcode file load fails, stop on first error.
- If any of the present CPUs are offline, then stop reload.
  This is just for being paranoid. 
- Added more comments in commit log and inline in file.
- split some functionality from reload_store() per Boris's comments.

What's not done from review: TBD:
- Load microcode file only once. Added comments in source for future cleanup.
- Removing ucd->errors. (Gives a count of failed loads)


Ashok Raj (3):
  x86/microcode/intel: Check microcode revision before updating sibling
    threads
  x86/microcode/intel: Perform a cache flush before ucode update.
  x86/microcode: Quiesce all threads before a microcode update.

 arch/x86/kernel/cpu/microcode/core.c  | 207 ++++++++++++++++++++++++++++++----
 arch/x86/kernel/cpu/microcode/intel.c |  43 ++++++-
 2 files changed, 222 insertions(+), 28 deletions(-)

-- 
2.7.4