linux-kernel - Re: [PATCH v8 31/40] x86/compressed: add SEV-SNP feature detection/setup

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Message-ID: <YegKTxXHDSSh5xHl@zn.tnic>
Date:   Wed, 19 Jan 2022 13:55:43 +0100
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>,
        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>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v8 31/40] x86/compressed: add SEV-SNP feature
 detection/setup

On Fri, Dec 10, 2021 at 09:43:23AM -0600, Brijesh Singh wrote:
> +/*
> + * TODO: These are exported only temporarily while boot/compressed/sev.c is
> + * the only user. This is to avoid unused function warnings for kernel/sev.c
> + * during the build of kernel proper.
> + *
> + * Once the code is added to consume these in kernel proper these functions
> + * can be moved back to being statically-scoped to units that pull in
> + * sev-shared.c via #include and these declarations can be dropped.
> + */
> +struct cc_blob_sev_info *snp_find_cc_blob_setup_data(struct boot_params *bp);

You don't need any of that - just add the function with the patch which
uses it.

> +/*
> + * Search for a Confidential Computing blob passed in as a setup_data entry
> + * via the Linux Boot Protocol.
> + */
> +struct cc_blob_sev_info *
> +snp_find_cc_blob_setup_data(struct boot_params *bp)

Please break lines like that only if absolutely necessary. Which doesn't
look like it here.

Thx.

-- 
Regards/Gruss,
    Boris.

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