linux-kernel - Re: [PATCHv13 3/9] efi/libstub: Implement support for unaccepted memory

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Message-ID: <20230602122021.ad275pqia6wfclyc@box.shutemov.name>
Date:   Fri, 2 Jun 2023 15:20:21 +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 3/9] efi/libstub: Implement support for unaccepted
 memory

On Fri, Jun 02, 2023 at 02:10:05PM +0200, Borislav Petkov wrote:
> On Thu, Jun 01, 2023 at 09:25:37PM +0300, Kirill A. Shutemov wrote:
> > diff --git a/drivers/firmware/efi/Kconfig b/drivers/firmware/efi/Kconfig
> > index 043ca31c114e..231f1c70d1db 100644
> > --- a/drivers/firmware/efi/Kconfig
> > +++ b/drivers/firmware/efi/Kconfig
> > @@ -269,6 +269,20 @@ config EFI_COCO_SECRET
> >  	  virt/coco/efi_secret module to access the secrets, which in turn
> >  	  allows userspace programs to access the injected secrets.
> >  
> > +config UNACCEPTED_MEMORY
> 
> Why is this Kconfig symbol in this file?
> 
> I'm thinking this needs to be somewhere generic, like in mm/Kconfig or
> so...

Unaccepted memory is an EFI feature. We can move it somewhere else, if
other firmware/platform would support anything like it.

-- 
  Kiryl Shutsemau / Kirill A. Shutemov