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

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Message-ID: <YtcCWfCQuEsVhH6W@zn.tnic>
Date:   Tue, 19 Jul 2022 21:13:50 +0200
From:   Borislav Petkov <bp@...en8.de>
To:     Dionna Amalie Glaze <dionnaglaze@...gle.com>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        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>,
        Dave Hansen <dave.hansen@...el.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 Tue, Jul 19, 2022 at 11:29:32AM -0700, Dionna Amalie Glaze wrote:
> How about instead of the limited resource of UTS_VERSION, we add a
> SETUP_BOOT_FEATURES enum for setup_data in the boot header? That would
> be easier to parse out and more extensible in the future.
> https://www.kernel.org/doc/html/latest/x86/boot.html?highlight=boot
> 
> This can contain a bitmap of a number of features that we currently
> need manual tagging for, such as SEV guest support, SEV-SNP guest
> support, TDX guest support, and (CONFIG_UNACCEPTED_MEMORY, TDX) or
> (CONFIG_UNACCEPTED_MEMORY, SEV-SNP).
> The VMM, UEFI, or boot loader can read these from the images/kernels
> and have the appropriate behavior.

I think for stuff like that you want loadflags or xloadflags in the
setup header.

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette