Re: [PATCH 0/2] KVM: SVM: Fix unexpected #UD on INT3 in SEV guests

[Sean Christopherson]

On Wed, Aug 23, 2023, Sean Christopherson wrote:
> One idea to make the original bug repro on every run would be to constantly
> toggle nx_huge_pages between "off" and "force" while the guest is booting.  Toggling
> nx_huge_pages should force KVM to rebuild the SPTEs and all but guarantee trying
> to deliver the #BP will hit a #NPF.

Mwhahaha.  That, plus a delay in the guest and disabling THP, makes this 100%
reproducible.  I'll verify the fix actually works before posting v2.