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

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Message-ID: <09caba0b-6b3d-668f-312c-ed870379b669@redhat.com>
Date:   Wed, 15 Sep 2021 17:35:40 +0200
From:   David Hildenbrand <david@...hat.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Chao Peng <chao.p.peng@...ux.intel.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Andy Lutomirski <luto@...nel.org>,
        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>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Andi Kleen <ak@...ux.intel.com>,
        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,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>
Subject: Re: [RFC] KVM: mm: fd-based approach for supporting KVM guest private
 memory

>>
>>> who will actually do some kind of gfn-epfn etc. mapping, how we'll
>>> forbid access to this memory e.g., via /proc/kcore or when dumping memory
>>
>> It's not aimed to prevent root to shoot into his leg. Root do root.
> 
> IMHO being root is not an excuse to read some random file (actually used
> in production environments) to result in the machine crashing. Not
> acceptable for distributions.
I just realized that reading encrypted memory should be ok and only 
writing is an issue, right?


-- 
Thanks,

David / dhildenb