Re: [PATCHv3 2/7] efi/x86: Get full memory map in allocate_e820()

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To: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andy Lutomirski <luto@xxxxxxxxxx>, Sean Christopherson <seanjc@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Joerg Roedel <jroedel@xxxxxxx>, Ard Biesheuvel <ardb@xxxxxxxxxx>
Subject: Re: [PATCHv3 2/7] efi/x86: Get full memory map in allocate_e820()
From: Dave Hansen <dave.hansen@xxxxxxxxx>
Date: Mon, 31 Jan 2022 14:38:42 -0800
Cc: Andi Kleen <ak@xxxxxxxxxxxxxxx>, Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, Paolo Bonzini <pbonzini@xxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Varad Gautam <varad.gautam@xxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Brijesh Singh <brijesh.singh@xxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, x86@xxxxxxxxxx, linux-mm@xxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20220128205906.27503-3-kirill.shutemov@linux.intel.com>
References: <20220128205906.27503-1-kirill.shutemov@linux.intel.com> <20220128205906.27503-3-kirill.shutemov@linux.intel.com>
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On 1/28/22 12:59, Kirill A. Shutemov wrote:
> Modify allocate_e820() to get a full memory map.

Dumb question time: why doesn't the current code get a full memory map?
 This looks simpler.  What's the downside?  Memory consumption?

Follow-Ups:
- Re: [PATCHv3 2/7] efi/x86: Get full memory map in allocate_e820()
  - From: Kirill A. Shutemov

References:
- [PATCHv3 0/7] Implement support for unaccepted memory
  - From: Kirill A. Shutemov
- [PATCHv3 2/7] efi/x86: Get full memory map in allocate_e820()
  - From: Kirill A. Shutemov

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