linux-kernel - Re: [PATCH Part1 v5 11/38] x86/compressed: Add helper for validating pages in the decompression stage

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Date:   Mon, 23 Aug 2021 13:55:16 -0500
From:   Brijesh Singh <brijesh.singh@....com>
To:     Borislav Petkov <bp@...en8.de>
Cc:     brijesh.singh@....com, 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>,
        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 11/38] x86/compressed: Add helper for validating
 pages in the decompression stage



On 8/23/21 9:16 AM, Borislav Petkov wrote:
> On Fri, Aug 20, 2021 at 10:19:06AM -0500, Brijesh Singh wrote:
>> diff --git a/arch/x86/include/asm/sev-common.h b/arch/x86/include/asm/sev-common.h
>> index d426c30ae7b4..1cd8ce838af8 100644
>> --- a/arch/x86/include/asm/sev-common.h
>> +++ b/arch/x86/include/asm/sev-common.h
>> @@ -57,6 +57,26 @@
>>   #define GHCB_MSR_AP_RESET_HOLD_REQ	0x006
>>   #define GHCB_MSR_AP_RESET_HOLD_RESP	0x007
>>   
>> +/* SNP Page State Change */
> 
> Let's make it very clear here that those cmd numbers below are actually
> part of the protocol and not randomly chosen:
> 
> /*
>   * ...
>   *
>   * 0x014 – SNP Page State Change Request
>   *
>   * GHCBData[55:52] – Page operation:
>   *   0x0001 – Page assignment, Private
>   *   0x0002 – Page assignment, Shared
>   */
> 

Noted.

thanks