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The wait for control loop in which the siblings are waiting for the
microcode update on the primary thread must be protected against
instrumentation as instrumentation can end up in #INT3, #DB or #PF,
which then returns with IRET. That IRET reenables NMI which is the
opposite of what the NMI rendezvous is trying to achieve.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20231002115903.545969323@linutronix.de
1582c0f4a2