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    Subject[PATCH 00/13] Make microcode loading more robust
    Date
    This series adds more robustness to microcode loading.

    - Adds proper quiesce to sibling threads in an NMI handler.
    - Fixes some nasty early loading bugs that are there for a long time.
    - Adds a minimum revision ID to Intel patch meta-data, requested by Thomas.
    - Turns microcode late loading back on by default.
    - Adds some debugfs support to provide ability to test the microcode flows
    without the need for a new microcode.

    This series has too many changes from previous post, but for anecdotal
    references.

    https://lore.kernel.org/lkml/20220817051127.3323755-1-ashok.raj@intel.com/

    Here is a summary of those patches.

    patch1: Allow printing the old and new rev during an early update
    patch2: Fix a potential bug during CPU hot-add flow for microcode update.
    patch3: Fixes a nasty early loading bug that locks up with endless retries.
    patch4: Add a helper to perform self NMI
    patch5: Drop siblings in NMI while primary thread updates the microcode.
    patch6: Rename refresh_fw to late_loading, in preparation for min-rev patches.
    patch7: Move late loading warning to the same function as where taint happens.
    patch8: Adds support for microcode meta-data to declare a minimum version
    patch9: Add a generic way to declare support for min-rev across vendors.
    patch10: Drop wbinvd(), its not required after patch7.
    patch11: Print microcode updated messages only when its successfully loaded
    patch12: Issue a warning if MCE arrives while a microcode update is in progress.
    patch13: Debug patch: To permit testing repeated loading of microcode.

    Ashok Raj (12):
    x86/microcode/intel: Print old and new rev after early microcode
    update
    x86/microcode: Do not load from filesystem for CPU hot add
    x86/microcode/intel: Fix a hang if early loading microcode fails
    x86/microcode: Place siblings in NMI loop while update in progress
    x86/microcode: Rename refresh_fw to late_loading
    x86/microcode: Move late-load warning to earlier where kernel taint
    happens
    x86/microcode/intel: Add minimum required revision to microcode header
    x86/microcode: Add a generic mechanism to declare support for minrev
    x86/microcode/intel: Drop wbinvd() from microcode loading
    x86/microcode: Display revisions only when update is successful
    x86/mce: Warn of a microcode update is in progress when MCE arrives
    x86/microcode/intel: Add ability to update microcode even if rev is
    unchanged

    Jacob Pan (1):
    x86/x2apic: Support x2apic self IPI with NMI_VECTOR

    arch/x86/include/asm/microcode.h | 39 ++++++-
    arch/x86/include/asm/microcode_intel.h | 4 +-
    arch/x86/kernel/apic/x2apic_phys.c | 6 +-
    arch/x86/kernel/cpu/mce/core.c | 5 +
    arch/x86/kernel/cpu/microcode/amd.c | 6 +-
    arch/x86/kernel/cpu/microcode/core.c | 156 ++++++++++++++++++++++---
    arch/x86/kernel/cpu/microcode/intel.c | 85 +++++++++-----
    arch/x86/kernel/cpu/microcode/nmi.c | 72 ++++++++++++
    arch/x86/kernel/nmi.c | 7 ++
    arch/x86/Kconfig | 7 +-
    arch/x86/kernel/cpu/microcode/Makefile | 1 +
    11 files changed, 332 insertions(+), 56 deletions(-)
    create mode 100644 arch/x86/kernel/cpu/microcode/nmi.c

    --
    2.34.1

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