Re: [PATCH V2 01/10] x86/CPU: Expose if cache is inclusive of lower level caches

Borislav Petkov
2019-08-06T18:32:51Z

On Tue, Aug 06, 2019 at 11:13:22AM -0700, Reinette Chatre wrote:
> Some platforms being enabled in this round have SKUs with inclusive
> cache and also SKUs with non-inclusive cache. The non-inclusive cache
> SKUs do not support cache pseudo-locking and cannot be made to support
> cache pseudo-locking with software changes. Needing to know if cache is
> inclusive or not will thus remain a requirement to distinguish between
> these different SKUs. Supporting cache pseudo-locking on platforms with
> non inclusive cache will require new hardware features.

Is there another way/CPUID bit or whatever to tell us whether the
platform supports cache pseudo-locking or is the cache inclusivity the
only one?

--
Regards/Gruss,
Boris.

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