linux-kernel - Re: [PATCH Part1 RFC v3 04/22] x86/mm: Add sev_feature

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Date:   Sat, 5 Jun 2021 12:50:53 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Brijesh Singh <brijesh.singh@....com>
Cc:     x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-efi@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-coco@...ts.linux.dev, linux-mm@...ck.org,
        linux-crypto@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
        Tom Lendacky <thomas.lendacky@....com>,
        "H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
        David Rientjes <rientjes@...gle.com>, tony.luck@...el.com,
        npmccallum@...hat.com
Subject: Re: [PATCH Part1 RFC v3 04/22] x86/mm: Add sev_feature_enabled()
 helper

On Wed, Jun 02, 2021 at 09:03:58AM -0500, Brijesh Singh wrote:
> @@ -78,6 +85,7 @@ static inline void sev_es_init_vc_handling(void) { }
>  static inline bool sme_active(void) { return false; }
>  static inline bool sev_active(void) { return false; }
>  static inline bool sev_es_active(void) { return false; }
> +static inline bool sev_snp_active(void) { return false; }

Leftover from the previous version, can go.

> +bool sev_feature_enabled(unsigned int type)
> +{
> +	switch (type) {
> +	case SEV: return sev_status & MSR_AMD64_SEV_ENABLED;
> +	case SEV_ES: return sev_status & MSR_AMD64_SEV_ES_ENABLED;
> +	case SEV_SNP: return sev_status & MSR_AMD64_SEV_SNP_ENABLED;
> +	default: return false;
> +	}
> +}

Yeah, btw, we might even do a generic one, see:

https://lkml.kernel.org/r/YLkcIuL2qvo0hviU@zn.tnic

and the following mail.

But that doesn't matter as sev_feature_enabled()'s body can go into
sev_protected_guest_has() or whatever we end up calling it.

Thx.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette