Changes

x86: document the array of cpu features

By the way, we already get word 16 so save it too.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

x86: use a global is_hybrid flag

The Intel hybrid feature bit is reserved on AMD, so define
our own flag that we'll update separately on AMD later.

By the way, restrict the Intel cpukinds code to Intel now
that it depends on that non-Intel-specific flag.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

x86: remove the explicit apic_number in leaves 0xb/0x0f

It's the number of logical procs in the next level,
but the type of that level isn't known in advance anyway
(contrary to what some comments were sort of saying,
 which could confuse future changes).

And we don't use that number anyway, just keep it in debugging messages.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

gather-cpuid: note about future AMD 0x8000002[78] leaves

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

x86: Intel has a new "DieGrp" level in the CPUID doc

Not sure what it corresponds to, keep it as an unknown level for now.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

x86: only try to build die objects and unit/tile/module groups if we found some info

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

x86: update the loop break when reading topology cpuid leaves 0x1f/0x0b

AMD supports 0x0b but they don't specify the same break condition.
Things worked fine in practice but a new AMD variant is coming,
so don't assume any implicit compatibility with Intel anymore.

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

x86: add support for AMD 0x80000026 CPUID leaf

This new leaf is similar to Intel 0x0b (already supported on AMD)
and Intel 0x1f but it comes with AMD-specific levels (CCX="Complex"
and CCD=Die which doesn't have the same value as Intel die level).

This is supported on Zen4 (at least Genoa EPYCs) where there's
currently a single CCX per CCD, hence we get Dies (but no "Complex" groups).

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>

tests/x86: add a amd zen4 genoa case for cpuid leaf 0x80000026

Signed-off-by: Brice Goglin <Brice.Goglin@inria.fr>