linux-kernel - Re: [PATCH Part1 RFC v4 04/36] x86/mm: Add sev_feature

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Date:   Tue, 10 Aug 2021 09:57:38 -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,
        linux-crypto@...r.kernel.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>, tony.luck@...el.com,
        npmccallum@...hat.com, brijesh.ksingh@...il.com
Subject: Re: [PATCH Part1 RFC v4 04/36] x86/mm: Add sev_feature_enabled()
 helper



On 8/10/21 6:25 AM, Borislav Petkov wrote:
> On Wed, Jul 07, 2021 at 01:14:34PM -0500, Brijesh Singh wrote:
>> The sev_feature_enabled() helper 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>
>> ---
>>   arch/x86/include/asm/mem_encrypt.h |  8 ++++++++
>>   arch/x86/include/asm/msr-index.h   |  2 ++
>>   arch/x86/mm/mem_encrypt.c          | 14 ++++++++++++++
>>   3 files changed, 24 insertions(+)
> 
> This will get replaced by this I presume:
> 
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flkml.kernel.org%2Fr%2Fcover.1627424773.git.thomas.lendacky%40amd.com&amp;data=04%7C01%7Cbrijesh.singh%40amd.com%7C15d8b87644e148488da408d95bf16ae3%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637641914718165877%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&amp;sdata=UMRigkWSG2h%2BZ4L08AUlG0JeUiqMb9te52LprPrq51M%3D&amp;reserved=0
> 

Yes.

thanks