Thomas Gleixner 8f849ff63b x86/microcode: Handle "offline" CPUs correctly ...

Offline CPUs need to be parked in a safe loop when microcode update is
in progress on the primary CPU. Currently, offline CPUs are parked in
mwait_play_dead(), and for Intel CPUs, its not a safe instruction,
because the MWAIT instruction can be patched in the new microcode update
that can cause instability.

  - Add a new microcode state 'UCODE_OFFLINE' to report status on per-CPU
  basis.
  - Force NMI on the offline CPUs.

Wake up offline CPUs while the update is in progress and then return
them back to mwait_play_dead() after microcode update is complete.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231002115903.660850472@linutronix.de

2023-10-24 15:05:55 +02:00

..

amd.c

x86/microcode: Handle "nosmt" correctly

2023-10-24 15:05:54 +02:00

core.c

x86/microcode: Handle "offline" CPUs correctly

2023-10-24 15:05:55 +02:00

intel.c

x86/microcode: Rendezvous and load in NMI

2023-10-24 15:05:55 +02:00

internal.h

x86/microcode: Handle "offline" CPUs correctly

2023-10-24 15:05:55 +02:00

Makefile

x86/microcode: Hide the config knob

2023-08-13 10:26:39 +02:00