linux-kernel - Re: [PATCH v9 02/43] KVM: SVM: Create a separate mapping for the SEV-ES save area

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Date:   Wed, 9 Feb 2022 09:02:14 -0600
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>,
        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>,
        "Dr . David Alan Gilbert" <dgilbert@...hat.com>,
        brijesh.ksingh@...il.com, tony.luck@...el.com, marcorr@...gle.com,
        sathyanarayanan.kuppuswamy@...ux.intel.com,
        Venu Busireddy <venu.busireddy@...cle.com>
Subject: Re: [PATCH v9 02/43] KVM: SVM: Create a separate mapping for the
 SEV-ES save area



On 2/1/22 7:02 AM, Borislav Petkov wrote:
> On Fri, Jan 28, 2022 at 11:17:23AM -0600, Brijesh Singh wrote:
>> From: Tom Lendacky <thomas.lendacky@....com>
>>
>> The save area for SEV-ES/SEV-SNP guests, as used by the hardware, is
>> different from the save area of a non SEV-ES/SEV-SNP guest.
>>
>> This is the first step in defining the multiple save areas to keep them
>> separate and ensuring proper operation amongst the different types of
>> guests. Create an SEV-ES/SEV-SNP save area and adjust usage to the new
>> save area definition where needed.
>>
>> Reviewed-by: Venu Busireddy <venu.busireddy@...cle.com>
>> Signed-off-by: Tom Lendacky <thomas.lendacky@....com>
>> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
>> ---
>>   arch/x86/include/asm/svm.h | 87 +++++++++++++++++++++++++++++---------
>>   arch/x86/kvm/svm/sev.c     | 24 +++++------
>>   arch/x86/kvm/svm/svm.h     |  2 +-
>>   3 files changed, 80 insertions(+), 33 deletions(-)
> 
> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fr%2FYc2jzOunYej4vwSc%40zn.tnic&amp;data=04%7C01%7Cbrijesh.singh%40amd.com%7C909b88bb6fb14010859508d9e583268e%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637793173738404187%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000&amp;sdata=uOR2wyzO1%2B6K%2B%2FhZCkwlRrfQutFqpSzXKh8RVbub9cA%3D&amp;reserved=0
> 

The rename may touch more files in KVM subsystem, so, I'll work on this 
feedback while adding the SNP host support, and will submit it as a 
per-requisite for the host support.

-Brijesh