linux-kernel - Re: [PATCHv7 11/14] x86: Disable kexec if system has unaccepted memory

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Message-ID: <88fe385c-fe40-d659-5081-7f3cdd9493e4@intel.com>
Date:   Tue, 28 Jun 2022 17:10:56 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        "Eric W. Biederman" <ebiederm@...ssion.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>,
        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,
        x86@...nel.org, linux-mm@...ck.org, linux-coco@...ts.linux.dev,
        linux-efi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kexec@...ts.infradead.org
Subject: Re: [PATCHv7 11/14] x86: Disable kexec if system has unaccepted
 memory

On 6/28/22 16:51, Kirill A. Shutemov wrote:
> On Fri, Jun 24, 2022 at 05:00:05AM +0300, Kirill A. Shutemov wrote:
>>> If there is some deep and fundamental why this can not be supported
>>> then it probably makes sense to put some code in the arch_kexec_load
>>> hook that verifies that deep and fundamental reason is present.
...
> +	/*
> +	 * TODO: Information on memory acceptance status has to be communicated
> +	 * between kernel.
> +	 */

So, the deep and fundamental reason is... drum roll... you haven't
gotten around to implementing bitmap passing yet?!?!?   I have the
feeling that wasn't what Eric was looking for.