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

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Date:   Fri, 27 Aug 2021 13:27:14 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>
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 8/27/21 1:13 PM, Borislav Petkov wrote:
> 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?

Those definitions are present in <asm/xxx>. Somewhere I read said that
if possible a new drivers should avoid including the <asm/xxx>. This is
one of the motivation to create a new file to provide the selective
information.


> Lemme ask my question again:
>
> Is SNP available on something which is !x86, all of a sudden?

Nope


>
> Why would you want to compile that driver on anything but x86?
>
Nobody should compile it for !x86. If my read about including <asm/xx>
in driver is wrong then I do not see any need for creating new header
file. I can drop the header file inclusion in next update.

thanks