linux-kernel - Re: [PATCH v9 37/43] x86/sev: Add SEV-SNP feature detection/setup

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Message-ID: <YgAjq3mSudt+G+6Y@zn.tnic>
Date:   Sun, 6 Feb 2022 20:38:19 +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>,
        brijesh.ksingh@...il.com, tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v9 37/43] x86/sev: Add SEV-SNP feature detection/setup

On Fri, Jan 28, 2022 at 11:17:58AM -0600, Brijesh Singh wrote:
> +static __init struct cc_blob_sev_info *snp_find_cc_blob(struct boot_params *bp)
> +{
> +	struct cc_blob_sev_info *cc_info;
> +
> +	/* Boot kernel would have passed the CC blob via boot_params. */
> +	if (bp->cc_blob_address) {
> +		cc_info = (struct cc_blob_sev_info *)(unsigned long)bp->cc_blob_address;
> +		goto found_cc_info;
> +	}

What is the difference here, why aren't you looking for the blob in an
EFI table?

Even if you're booted directly by firmware, there should still be EFI
there or?

And if so, then I think you should share some of the code through
sev-shared.c so that there's not so much duplication...

-- 
Regards/Gruss,
    Boris.

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