linux-kernel - Re: [RFC v2-fix-v2 1/1] x86: Introduce generic protected guest abstractionn

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Date:   Sat, 5 Jun 2021 00:15:55 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        Tony Luck <tony.luck@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Raj Ashok <ashok.raj@...el.com>,
        Sean Christopherson <seanjc@...gle.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC v2-fix-v2 1/1] x86: Introduce generic protected guest
 abstractionn

On Fri, Jun 04, 2021 at 05:01:31PM -0500, Tom Lendacky wrote:
> The first is analogous to sme_active(), the second to sev_active() and the
> third to mem_encrypt_active(). Just my opinion, though...

Yeah, or cc_has() where "cc" means "confidential computing". Or "coco"...

Yeah, no good idea yet.

> I don't think you want a WARN_ON_ONCE() here. The code will be written to
> work with either SEV or TDX, so we shouldn't warn on a check for a TDX
> supported feature when running on AMD (or vice-versa).

That's an AMD-specific path so it would warn only when a flag is used
which is unknown/unused yet on AMD.

-- 
Regards/Gruss,
    Boris.

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