linux-kernel - Re: [PATCH 0/5] x86: Impplement support for unaccepted memory

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Message-ID: <20210812101054.5y6oufwwnisebuyy@box.shutemov.name>
Date:   Thu, 12 Aug 2021 13:10:54 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Joerg Roedel <jroedel@...e.de>
Cc:     Borislav Petkov <bp@...en8.de>, Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@...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>,
        Paolo Bonzini <pbonzini@...hat.com>,
        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,
        linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH 0/5] x86: Impplement support for unaccepted memory

On Thu, Aug 12, 2021 at 10:23:24AM +0200, Joerg Roedel wrote:
> Hi Kirill,
> 
> On Tue, Aug 10, 2021 at 09:26:21AM +0300, Kirill A. Shutemov wrote:
> > Accepting happens via a protocol specific for the Virtrual Machine
> > platform.
> 
> That sentence bothers me a bit. Can you explain what it VMM specific in
> the acceptance protocol?

For TDX we have a signle MapGPA hypercall to VMM plus TDAcceptPage for
every accepted page to TDX Module. SEV-SNP has to something similar.

-- 
 Kirill A. Shutemov