linux-kernel - Re: [PATCHv7 00/14] mm, x86/cc: Implement support for unaccepted memory

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Message-ID: <e09dae40-d269-cfed-d048-3e62275c1bb7@intel.com>
Date:   Fri, 24 Jun 2022 10:09:24 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Marc Orr <marcorr@...gle.com>
Cc:     Peter Gonda <pgonda@...gle.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>,
        Ard Biesheuvel <ardb@...nel.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>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Marcelo <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-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCHv7 00/14] mm, x86/cc: Implement support for unaccepted
 memory

On 6/24/22 10:06, Marc Orr wrote:
> I think Peter's point is a little more nuanced than that. Once lazy
> accept goes into the guest firmware -- without the feature negotiation
> that Peter is suggesting -- cloud providers now have a bookkeeping
> problem. Which images have kernels that can boot from a guest firmware
> that doesn't pre-validate all the guest memory?

Hold on a sec though...

Is this a matter of

	can boot from a guest firmware that doesn't pre-validate all the
	guest memory?

or

	can boot from a guest firmware that doesn't pre-validate all the
	guest memory ... with access to all of that guest's RAM?

In other words, are we talking about "fails to boot" or "can't see all
the RAM"?