linux-kernel - Re: [PATCHv13 5/9] efi: Add unaccepted memory support

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Message-ID: <20230606121924.wcjezcppuiofvnk6@box.shutemov.name>
Date:   Tue, 6 Jun 2023 15:19:24 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        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>,
        Dario Faggioli <dfaggioli@...e.com>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Mel Gorman <mgorman@...hsingularity.net>,
        marcelo.cerri@...onical.com, tim.gardner@...onical.com,
        khalid.elmously@...onical.com, philip.cox@...onical.com,
        aarcange@...hat.com, peterx@...hat.com, x86@...nel.org,
        linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCHv13 5/9] efi: Add unaccepted memory support

On Mon, Jun 05, 2023 at 09:12:25PM +0200, Borislav Petkov wrote:
> So how about you explain that explicitly somewhere, perhaps in a comment
> above accept_memory(), that the unaccepted range is not the whole memory
> but only, well, what is unaccepted and the rest is implicitly accepted?

Does it look okay to you?

/*
 * accept_memory() -- Consult bitmap and accept the memory if needed.
 *
 * Only memory that explicitly marked as unaccepted in the bitmap requires
 * an action.
 *
 * No need to accept:
 *  - anything if the system has no unaccepted table;
 *  - memory that is below phys_base;
 *  - memory that is above the memory that addressable by the bitmap;
 */

-- 
  Kiryl Shutsemau / Kirill A. Shutemov