Re: [RFC Part1 PATCH 07/13] x86/compressed: register GHCB memory when SNP is active

[Borislav Petkov]

On Wed, Apr 07, 2021 at 12:34:59PM -0500, Brijesh Singh wrote:
> The feature is part of the GHCB version 2 and is enforced by the
> hypervisor. I guess it can be extended for the ES. Since this feature
> was not available in GHCB version 1 (base ES) so it should be presented
> as an optional for the ES ?

Yeah, it probably is not worth the effort. If an attacker controls the
guest kernel, then it can re-register a new GHCB so it doesn't really
matter.

-- 
Regards/Gruss,
    Boris.

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