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Add NUMA helpers to probe for support/availability and to check if the test is running on a multi-node system. The APIs will be used to verify guest_memfd NUMA support. Signed-off-by: Shivank Garg <shivankg@amd.com> [sean: land helpers in numaif.h, add comments, tweak names] Link: https://lore.kernel.org/r/20251016172853.52451-11-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>