linux-kernel - Re: [PATCHv5 07/12] x86/mm: Reserve unaccepted memory bitmap

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Message-ID: <Ymvl0N7umDfcjfMb@fedora>
Date:   Fri, 29 Apr 2022 10:19:12 -0300
From:   Wander Lairson Costa <wander@...hat.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     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>,
        Brijesh Singh <brijesh.singh@....com>,
        Mike Rapoport <rppt@...nel.org>,
        David Hildenbrand <david@...hat.com>, x86@...nel.org,
        linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Mike Rapoport <rppt@...ux.ibm.com>
Subject: Re: [PATCHv5 07/12] x86/mm: Reserve unaccepted memory bitmap

On Mon, Apr 25, 2022 at 06:39:29AM +0300, Kirill A. Shutemov wrote:
> A given page of memory can only be accepted once. The kernel has a need
> to accept memory both in the early decompression stage and during normal
> runtime.
> 
> A bitmap used to communicate the acceptance state of each page between the

nit: s/bitmap used/bitmap is used/

[snip]