linux-kernel - Re: [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest request NAEs

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Date:   Fri, 27 Aug 2021 14:57:11 -0500
From:   Tom Lendacky <thomas.lendacky@....com>
To:     Brijesh Singh <brijesh.singh@....com>,
        Borislav Petkov <bp@...en8.de>
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>,
        "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>,
        Wanpeng Li <wanpengli@...cent.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>, tony.luck@...el.com,
        marcorr@...gle.com, sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH Part1 v5 33/38] x86/sev: Provide support for SNP guest
 request NAEs

On 8/27/21 1:07 PM, Brijesh Singh wrote:
> On 8/27/21 12:44 PM, Borislav Petkov wrote:
>> On Fri, Aug 20, 2021 at 10:19:28AM -0500, Brijesh Singh wrote:

...

>>> +
>>> +/*
>>> + * The error code when the data_npages is too small. The error code
>>> + * is defined in the GHCB specification.
>>> + */
>>> +#define SNP_GUEST_REQ_INVALID_LEN	0x100000000ULL
>> so basically
>>
>> BIT_ULL(32)
> 
> Noted.

The main thing about this is that it is an error code from the HV on 
extended guest requests. The HV error code sits in the high-order 32-bits 
of the SW_EXIT_INFO_2 field. So defining it either way seems a bit 
confusing. To me, the value should just be 1ULL and then it should be 
shifted when assigning it to the SW_EXIT_INFO_2.

Thanks,
Tom

>