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Shutemov" To: Andi Kleen Cc: Joerg Roedel , Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Varad Gautam , Dario Faggioli , x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: Re: [PATCH 0/5] x86: Impplement support for unaccepted memory Message-ID: <20210812202251.hn3c2xykm2l73avu@box.shutemov.name> References: <20210810062626.1012-1-kirill.shutemov@linux.intel.com> <20210812101054.5y6oufwwnisebuyy@box.shutemov.name> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Queue-Id: 79C3D30075BA Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=shutemov-name.20150623.gappssmtp.com header.s=20150623 header.b=xaNDyhy8; spf=none (imf03.hostedemail.com: domain of kirill@shutemov.name has no SPF policy when checking 209.85.167.54) smtp.mailfrom=kirill@shutemov.name; dmarc=none X-Rspamd-Server: rspam01 X-Stat-Signature: o8i6tta66pgs6xqfudgcy6swc37e6wwp X-HE-Tag: 1628799760-444331 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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