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Date: Tue, 19 Jul 2022 15:02:26 -0700 From: Dave Hansen <dave.hansen@...el.com> To: Borislav Petkov <bp@...en8.de> Cc: Ard Biesheuvel <ardb@...nel.org>, Dionna Amalie Glaze <dionnaglaze@...gle.com>, "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>, Peter Gonda <pgonda@...gle.com>, Andy Lutomirski <luto@...nel.org>, Sean Christopherson <seanjc@...gle.com>, Andrew Morton <akpm@...ux-foundation.org>, Joerg Roedel <jroedel@...e.de>, 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>, Mike Rapoport <rppt@...nel.org>, David Hildenbrand <david@...hat.com>, Marcelo Cerri <marcelo.cerri@...onical.com>, tim.gardner@...onical.com, Khalid ElMously <khalid.elmously@...onical.com>, philip.cox@...onical.com, the arch/x86 maintainers <x86@...nel.org>, Linux Memory Management List <linux-mm@...ck.org>, linux-coco@...ts.linux.dev, linux-efi <linux-efi@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, "Yao, Jiewen" <jiewen.yao@...el.com> Subject: Re: [PATCHv7 00/14] mm, x86/cc: Implement support for unaccepted memory On 7/19/22 14:50, Borislav Petkov wrote: > On Tue, Jul 19, 2022 at 02:35:45PM -0700, Dave Hansen wrote: >> They're trying to design something that can (forever) handle guests that >> might not be able to accept memory. > Wait, what? > > If you can't modify those guests to teach them to accept memory, how do > you add TDX or SNP guest support to them? Mainline today, for instance, doesn't have unaccepted memory support for TDX or SEV-SNP guests. But, they both still boot fine because folks either configure it on the host side not to *have* any unaccepted memory. Or, they just live with the small (4GB??) amount of pre-accepted memory, which is fine for testing things.
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