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Move the SMT control check out of the hyperv_cpuid selftest so that it is generally accessible all KVM selftests. Split the functionality into a helper that populates a buffer with SMT control value which other helpers can use to ascertain if SMT state is available and active. Signed-off-by: Pratik R. Sampat <prsampat@amd.com> Link: https://lore.kernel.org/r/20250305230000.231025-5-prsampat@amd.com [sean: prepend is_ to the helpers] Signed-off-by: Sean Christopherson <seanjc@google.com>