On Thu, Mar 09, 2023 at 08:19:58AM -0600, Tom Lendacky wrote:

I believe Joerg added that key for performance reasons, since it is used on
the exception path and can avoid all the calls to cc_platform_has(). I think
that key should stay.

Yes, that is right. The key is mainly for the NMI entry path which can
be performance relevant in some situations. For SEV-ES some special
handling is needed there to re-enable NMIs and adjust the #VC stack in
case it was raised on the VC-handlers entry path.

Regards,

	Joerg