[Artful] cherry-pick KVM fix for CPUs lacking virtual NMI support

Fabian Gr├╝nbichler f.gruenbichler at proxmox.com
Tue Dec 19 09:30:20 UTC 2017

BugLink: https://bugs.launchpad.net/1738982

== SRU Justification ==

Impact: systems with CPUs lacking virtual NMI support are no longer able
to load the kvm_intel module, and thus not able to use KVM functionality

Fix: cherry-pick re-introducing support for software NMI support

Regression Potential: applied upstream in 4.15 and 4.14.3, tested and
verified by multiple people

the original dropping of support was (functionally) reverted after
upstream got notified of how many CPUs were actually affected

see [1] for upstream patch re-introducing support

see [2] for the original upstream patch dropping support and following

1: https://lkml.kernel.org/r/<1509971473-74491-1-git-send-email-pbonzini@redhat.com>
2: https://lkml.kernel.org/r/<1490618297-10581-2-git-send-email-pbonzini@redhat.com>
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