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KVM: nSVM: Use KVM-governed feature framework to track "vNMI enabled"
Track "virtual NMI exposed to L1" via a governed feature flag instead of using a dedicated bit/flag in vcpu_svm. Note, checking KVM's capabilities instead of the "vnmi" param means that the code isn't strictly equivalent, as vnmi_enabled could have been set if nested=false where as that the governed feature cannot. But that's a glorified nop as the feature/flag is consumed only by paths that are gated by nSVM being enabled. Link: https://lore.kernel.org/r/20230815203653.519297-15-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
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