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

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Date:   Mon, 7 Jun 2021 20:26:04 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     "Kuppuswamy, Sathyanarayanan" 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     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,
        Tom Lendacky <thomas.lendacky@....com>
Subject: Re: [RFC v2-fix-v2 1/1] x86: Introduce generic protected guest
 abstraction

On Mon, Jun 07, 2021 at 11:01:05AM -0700, Kuppuswamy, Sathyanarayanan wrote:
> Why move this header outside CONFIG_INTEL_TDX_GUEST or
> CONFIG_AMD_MEM_ENCRYPT ifdef?

Because asm headers are usually included at the beginning of another,
possibly generic header. Unless you have a specially particular
reason to put them in additional guarding ifdeffery. Have a look at
include/linux/.

> This header only exists in x86 arch code. So it is better to protect
> it with x86 specific header file.

That doesn't sound like a special reason to me. And compilers are
usually very able at discarding unused symbols so I don't see a problem
with keeping all includes at the top, like it is usually done.

-- 
Regards/Gruss,
    Boris.

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