linux-kernel - Re: [PATCH v9 40/43] x86/sev: Register SEV-SNP guest request platform device

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Message-ID: <fcf3dd81-bb09-9c76-2985-c6524260442f@amd.com>
Date:   Wed, 2 Feb 2022 10:27:37 -0600
From:   Brijesh Singh <brijesh.singh@....com>
To:     Peter Gonda <pgonda@...gle.com>
Cc:     brijesh.singh@....com, the arch/x86 maintainers <x86@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <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 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>,
        Borislav Petkov <bp@...en8.de>,
        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 <tony.luck@...el.com>,
        Marc Orr <marcorr@...gle.com>,
        Sathyanarayanan Kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Subject: Re: [PATCH v9 40/43] x86/sev: Register SEV-SNP guest request platform
 device



On 2/1/22 2:21 PM, Peter Gonda wrote:

>> +       /* smoke-test the secrets page passed */
>> +       if (!info.secrets_phys || info.secrets_len != PAGE_SIZE)
>> +               return 0;
> 
> This seems like an error condition worth noting. If no cc_blob_address
> is passed it makes sense not to log but what if the address passed
> fails this smoke test, why not log?


If the smoke test fails, there will not be the /dev/sev-guest device, 
and userspace should log it accordingly. Having said so, I am not 
against logging if it helps.


thanks