linux-kernel - Re: [PATCH v14 1/3] x86/tdx: Make __tdx_module

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Message-ID: <Y0aUb3n7ouaeAt2a@zn.tnic>
Date:   Wed, 12 Oct 2022 12:18:23 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        Shuah Khan <shuah@...nel.org>,
        Jonathan Corbet <corbet@....net>,
        "H . Peter Anvin" <hpa@...or.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Tony Luck <tony.luck@...el.com>,
        Kai Huang <kai.huang@...el.com>,
        Wander Lairson Costa <wander@...hat.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: Re: [PATCH v14 1/3] x86/tdx: Make __tdx_module_call() usable in
 driver module

On Wed, Sep 28, 2022 at 02:55:33PM -0700, Kuppuswamy Sathyanarayanan wrote:
> To support TDX attestation, the TDX guest user interface driver must
> use the __tdx module_call() function in the driver to allow the user to
> obtain the TDREPORT.
> 
> So export the __tdx_module_call() and move the TDX Module IDs to
> asm/tdx.h.

The functions with the __ prefix are usually lower-level interfaces
which should be internal. Usually.

Why aren't you exporting the tdx_module_call() one instead?

-- 
Regards/Gruss,
    Boris.

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