linux-kernel - Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private memory

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Message-ID: <765e9bbe-2df5-3dcc-9329-347770dc091d@linux.intel.com>
Date:   Tue, 31 Aug 2021 13:01:37 -0700
From:   Andi Kleen <ak@...ux.intel.com>
To:     David Hildenbrand <david@...hat.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        David Rientjes <rientjes@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Tom Lendacky <thomas.lendacky@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Varad Gautam <varad.gautam@...e.com>,
        Dario Faggioli <dfaggioli@...e.com>, x86@...nel.org,
        linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>
Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private
 memory


>> Thanks a lot for this summary. A question about the requirement: do 
>> we or
>> do we not have plan to support assigned device to the protected VM?
>
> Good question, I assume that is stuff for the far far future.

It is in principle possible with the current TDX, but not secure. But 
someone might decide to do it. So it would be good to have basic support 
at least.

-Andi

>
>