The author’s take on this in the Mitigations section makes sense to me: > Remove the timeout, and a legitimately stuck core hangs the platform on the first SMI

The author’s take on this in the Mitigations section makes sense to me: > Remove the timeout, and a legitimately stuck core hangs the platform on the first SMI. Increase the timeout, and you kill performance on many-core platforms that are forced to quiesce all cores every SMM entry. It's not clear what the best path forward is, or if there is even a path forward at all.