Re: [PATCH v7 05/22] x86/sev: Move GHCB page based HV communication out of startup code

Borislav Petkov
2025-09-01T14:26:01Z

On Mon, Sep 01, 2025 at 04:02:04PM +0200, Ard Biesheuvel wrote:
> Are you sure this can be removed? It is tested in other places too
> (arch/x86/coco/sev/core.c), and AIUI, it is a Linux defined CPU
> feature so it will never be set automatically.

It it set in scattered.c for the "late" code like sev/core.c:

arch/x86/kernel/cpu/scattered.c:51: { X86_FEATURE_COHERENCY_SFW_NO, CPUID_EBX, 31, 0x8000001f, 0 },

Tom added it to boot/cpuflags.c, in addition, for the early testing which
we're doing differently now.

--
Regards/Gruss,
Boris.