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The SMM_CTL MSR not present feature was being open-coded for KVM. Add it to its newly added CPUID leaf 0x80000021 EAX proper. Also drop the bit description comments now the code is more self-describing. Signed-off-by: Kim Phillips <kim.phillips@amd.com> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Acked-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20230124163319.2277355-7-kim.phillips@amd.com