[Bug 218267] [Sapphire Rapids][Upstream]Boot up multiple Windows VMs hang

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218267

--- Comment #12 from Sean Christopherson (seanjc@google.com) ---
I'm not terribly concerned about the complexity, I'm more concerned about the
efficacy of a software workaround, and to a lesser extent the risk of doing
more harm than good (this seems unlikely though).  E.g. if an exit that _can_
occur during vectoring collides with the bug, then KVM will inject a spurious
fault into the guest.  And if our list of "impossible" exits is wrong, KVM
could incorrectly suppress an exception.

I suppose we could mitigate the efficacy concerns by emitting a pr_err_once()
to suggest a ucode update if the erratum is hit.

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