Re: [RFC PATCH 3/6] i386/sev: initialize SNP context

[Brijesh Singh]

On 7/15/21 4:32 AM, Dov Murik wrote:
> Just making sure I understand:
>
> * sev_enabled() returns true for SEV or newer (SEV or SEV-ES or
>    SEV-SNP).
> * sev_es_enabled() returns true for SEV-ES or newer (SEV-ES or SEV-SNP).
> * sev_snp_enabled() returns true for SEV-SNP or newer (currently only
>    SEV-SNP).
>
> Is that indeed the intention?

Yes. The SEV-SNP support requires the SEV and SEV-ES to be enabled. See 
the text from the APM vol2 section 15.36.

        The SEV-SNP features enable additional protection for encrypted
        VMs designed to achieve stronger isolation from the hypervisor.
        SEV-SNP is used with the SEV and SEV-ES features described in
        Section 15.34 and Section 15.35 respectively and requires the
        enablement and use of these features.

thanks