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Date:   Thu, 12 Aug 2021 23:22:51 +0300
From:   "Kirill A. Shutemov" <kirill@shutemov.name>
To:     Andi Kleen <ak@linux.intel.com>
Cc:     Joerg Roedel <jroedel@suse.de>, Borislav Petkov <bp@alien8.de>,
        Andy Lutomirski <luto@kernel.org>,
        Sean Christopherson <seanjc@google.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kuppuswamy Sathyanarayanan 
        <sathyanarayanan.kuppuswamy@linux.intel.com>,
        David Rientjes <rientjes@google.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Tom Lendacky <thomas.lendacky@amd.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Peter Zijlstra <peterz@infradead.org>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Ingo Molnar <mingo@redhat.com>,
        Varad Gautam <varad.gautam@suse.com>,
        Dario Faggioli <dfaggioli@suse.com>, x86@kernel.org,
        linux-mm@kvack.org, linux-coco@lists.linux.dev,
        linux-kernel@vger.kernel.org,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH 0/5] x86: Impplement support for unaccepted memory
Message-ID: <20210812202251.hn3c2xykm2l73avu@box.shutemov.name>
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On Thu, Aug 12, 2021 at 12:33:11PM -0700, Andi Kleen wrote:
> 
> On 8/12/2021 3:10 AM, Kirill A. Shutemov wrote:
> > 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.
> 
> 
> I think Joerg's question was if TDX has a single ABI for all hypervisors.
> The GHCI specification supports both hypervisor specific and hypervisor
> agnostic calls. But these basic operations like MapGPA are all hypervisor
> agnostic. The only differences would be in the existing hypervisor specific
> PV code.

My point was that TDX and SEV-SNP going to be different and we need a way
to hook the right protocol for each.

-- 
 Kirill A. Shutemov