Re: [PATCH RFC v9 05/51] x86/coco: move CONFIG_HAS_CC_PLATFORM check down into coco/Makefile

Borislav Petkov
2023-06-21T08:57:13Z

On Tue, Jun 20, 2023 at 03:43:15PM -0500, Michael Roth wrote:
> Basically, arch/x86/coco/Makefile is never processed if arch/x86/Kbuild
> indicates that CONFIG_HAS_CC_PLATFORM is not set. So if we want to have
> stuff in arch/x86/coco/Makefile that build for !CONFIG_HAS_CC_PLATFORM,
> like SNP host support, which does not rely on CONFIG_HAS_CC_PLATFORM
> being set, that check needs to be moved down into arch/x86/coco/Makefile.

Ok, so if you put SNP host support into arch/x86/virt/svm/sev.c, that
should work too and won't have any relation to CONFIG_HAS_CC_PLATFORM,
right?

The CC_PLATFORM thing is a way to check for confidential computing guest
features by abstracting the capabilities so that you don't have to check
*each* and *every* conf guest type in the conditionals and thus go nuts.

Thx.

--
Regards/Gruss,
Boris.