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

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Date:   Fri, 24 Jun 2022 12:58:16 -0500
From:   Michael Roth <michael.roth@....com>
To:     Peter Gonda <pgonda@...gle.com>
CC:     "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>,
        Dave Hansen <dave.hansen@...el.com>,
        "Mike Rapoport" <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        <marcelo.cerri@...onical.com>, <tim.gardner@...onical.com>,
        <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 Fri, Jun 24, 2022 at 12:40:57PM -0500, Michael Roth wrote:
> 
>  1) how to configure OVMF to enable/disable lazy acceptance
>     - compile time option most likely: accept-all/accept-minimum/accept-1GB
> 
>  2) how to introduce an automatic mode in the future where OVMF does the
>     right thing based on what the guest supports. Gerd floated the idea of
>     tying it to ExitBootServices as well, but not sure there's a solid
>     plan on what to do here yet.
> 
> If that's accurate, it seems like the only 'safe' option is to disable it via
> #1 (accept-all), and then when #2 comes along, compile OVMF to just Do The
> Right Thing.
> 
> Users who know their VMs implement lazy acceptance can force it on via
> accept-all OVMF compile option.

accept-min / accept-X I mean.