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Introduce X86_PROPERTY_* to allow retrieving values/properties from CPUID leafs, e.g. MAXPHYADDR from CPUID.0x80000008. Use the same core code as X86_FEATURE_*, the primary difference is that properties are multi-bit values, whereas features enumerate a single bit. Add this_cpu_has_p() to allow querying whether or not a property exists based on the maximum leaf associated with the property, e.g. MAXPHYADDR doesn't exist if the max leaf for 0x8000_xxxx is less than 0x8000_0008. Use the new property infrastructure in vm_compute_max_gfn() to prove that the code works as intended. Future patches will convert additional selftests code. Signed-off-by: Sean Christopherson <seanjc@google.com> Link: https://lore.kernel.org/r/20221006005125.680782-4-seanjc@google.com