RE: [PATCH v4 02/10] x86/cpu/topology: Add CPU type to struct cpuinfo_topology

[Luck, Tony]

>> The core is born this way and then it changes... so this is its native
>> model ID? Weird...
>
> In a hybrid system the model number reported by CPUID could represent
> multiple core-types. As model number is same for all cores, it is
> insufficient to uniquely identify the microarchitecture of a core. I
> believe "native model ID" bridges that gap as it is specific to a core.

Example from <asm/intel-family.h>

#define INTEL_ALDERLAKE_L               IFM(6, 0x9A) /* Golden Cove / Gracemont */

#define INTEL_RAPTORLAKE                IFM(6, 0xB7) /* Raptor Cove / Enhanced Gracemont */

The native model number could be helpful to tell what each of your P-cores and E-cores
are based on. Could be useful when the same base core is used in more than one SoC
generation.

-Tony