linux-kernel - Re: [PATCH v5 04/12] x86/tdx: Add protected guest support for TDX guest

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Message-ID: <YR/fYu6kn7DKpOCi@zn.tnic>
Date:   Fri, 20 Aug 2021 18:59:14 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Peter H Anvin <hpa@...or.com>,
        Tony Luck <tony.luck@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kirill Shutemov <kirill.shutemov@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan <knsathya@...nel.org>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 04/12] x86/tdx: Add protected guest support for TDX
 guest

On Fri, Aug 20, 2021 at 09:42:55AM -0700, Kuppuswamy, Sathyanarayanan wrote:
> Reason for suggesting seperate function for tdx_* specific protected guest
> check is, we will be adding some exceptions for TDX features (like command
> line option used to override the default flags or when device filter
> support is disabled). Our current final version looks like below. Such
> customization are not good in generic intel_* function right?

Err, why?

TDX is Intel technology. That's like asking to have

sev_prot_guest_has() and amd_prot_guest_has() on AMD.

Maybe I still don't get what you're trying to achieve but from where I'm
standing that sounds wrong.

-- 
Regards/Gruss,
    Boris.

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