linux-kernel - Re: [PATCH v8 03/40] x86/mm: Extend cc

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Date:   Mon, 13 Dec 2021 16:47:48 -0600
From:   Venu Busireddy <venu.busireddy@...cle.com>
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>,
        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>,
        tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com
Subject: Re: [PATCH v8 03/40] x86/mm: Extend cc_attr to include AMD SEV-SNP

On 2021-12-10 09:42:55 -0600, Brijesh Singh wrote:
> The CC_ATTR_SEV_SNP can be used by the guest to query whether the SNP -
> Secure Nested Paging feature is active.
> 
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
> +
> +	/**
> +	 * @CC_ATTR_SEV_SNP: Guest SNP is active.
> +	 *
> +	 * The platform/OS is running as a guest/virtual machine and actively
> +	 * using AMD SEV-SNP features.
> +	 */
> +	CC_ATTR_SEV_SNP = 0x100,

Perhaps add a note on why this is being set to 0x100?

With that...

Reviewed-by: Venu Busireddy <venu.busireddy@...cle.com>