Re: [PATCH v3 0/8] Implement generic cc_platform_has() helper function

Borislav Petkov
2021-09-15T16:46:23Z

On Wed, Sep 08, 2021 at 05:58:31PM -0500, Tom Lendacky wrote:
> This patch series provides a generic helper function, cc_platform_has(),
> to replace the sme_active(), sev_active(), sev_es_active() and
> mem_encrypt_active() functions.
>
> It is expected that as new confidential computing technologies are
> added to the kernel, they can all be covered by a single function call
> instead of a collection of specific function calls all called from the
> same locations.
>
> The powerpc and s390 patches have been compile tested only. Can the
> folks copied on this series verify that nothing breaks for them. Also,
> a new file, arch/powerpc/platforms/pseries/cc_platform.c, has been
> created for powerpc to hold the out of line function.

...

>
> Tom Lendacky (8):
> x86/ioremap: Selectively build arch override encryption functions
> mm: Introduce a function to check for confidential computing features
> x86/sev: Add an x86 version of cc_platform_has()
> powerpc/pseries/svm: Add a powerpc version of cc_platform_has()
> x86/sme: Replace occurrences of sme_active() with cc_platform_has()
> x86/sev: Replace occurrences of sev_active() with cc_platform_has()
> x86/sev: Replace occurrences of sev_es_active() with cc_platform_has()
> treewide: Replace the use of mem_encrypt_active() with
> cc_platform_has()

Ok, modulo the minor things the plan is to take this through tip after
-rc2 releases in order to pick up the powerpc build fix and have a clean
base (-rc2) to base stuff on, at the same time.

Pls holler if something's still amiss.

Sathya,

if you want to prepare the Intel variant intel_cc_platform_has() ontop
of those and send it to me, that would be good because then I can
integrate it all in one branch which can be used to base future work
ontop.

Thx.

--
Regards/Gruss,
Boris.