linux-kernel - Re: [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest request NAEs

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Message-ID: <YSkrPXLqg38txCqp@zn.tnic>
Date:   Fri, 27 Aug 2021 20:13:17 +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,
        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>,
        Dov Murik <dovmurik@...ux.ibm.com>,
        Tobin Feldman-Fitzthum <tobin@....com>,
        Michael Roth <michael.roth@....com>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Andi Kleen <ak@...ux.intel.com>, tony.luck@...el.com,
        marcorr@...gle.com, sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest
 request NAEs

On Fri, Aug 27, 2021 at 01:07:59PM -0500, Brijesh Singh wrote:
> Okay, works for me. The main reason why I choose the enum was to not
> expose the GHCB exit code to the driver

Why does that matter?

> but I guess that attestation driver need to know which VMGEXIT need to
> be called, so, its okay to have it pass the VMGEXIT number instead of
> enum.

Well, they're in an uapi header - can't be more public than that. :-)

> So far most of the changes were in x86 specific files. However, the
> attestation service is available through a driver to the userspace. The
> driver needs to use the VMGEXIT routines provides by the x86 core. I
> created the said header file so that driver does not need to include
> <asm/sev.h/sev-common.h> etc and will compile for !x86.

Lemme ask my question again:

Is SNP available on something which is !x86, all of a sudden?

Why would you want to compile that driver on anything but x86?

-- 
Regards/Gruss,
    Boris.

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