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

[Stefan Bader]

On 19.12.2017 10:30, Fabian Grünbichler wrote:
> BugLink: https://bugs.launchpad.net/1738982

Bug report not accessible.

-Stefan

> 
> == 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
> discusison
> 
> 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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