linux-kernel - Re: [PATCHv5 06/12] x86/boot/compressed: Handle unaccepted memory

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Date:   Fri, 13 May 2022 17:45:15 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Borislav Petkov <bp@...e.de>, Min Xu <min.m.xu@...el.com>,
        Jiaqi Gao <jiaqi.gao@...el.com>
Cc:     Dionna Amalie Glaze <dionnaglaze@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Borislav Petkov <bp@...en8.de>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        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>,
        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
Subject: Re: [PATCHv5 06/12] x86/boot/compressed: Handle unaccepted memory

On Fri, May 13, 2022 at 11:01:43AM +0200, Borislav Petkov wrote:
> + mroth
> - brijesh
> 
> On Thu, May 12, 2022 at 10:34:02PM -0700, Dionna Amalie Glaze wrote:
> > Kirill, I've been tracking these changes to see if we can handle the
> > unaccepted memory type for SEV-SNP, but testing has been an issue. The
> > proposed patch in Ovmf to introduce unaccepted memory seems to have
> > stalled out last September
> > (https://www.mail-archive.com/devel@edk2.groups.io/msg35842.html) and
> > is particularly difficult to adapt to SEV-SNP since it doesn't follow
> > the TDVF way of initializing all memory. Is there a different
> > development I might have missed so that we might test these cases?
> > Without the UEFI introducing EFI_UNACCEPTED_MEMORY type, any kernel
> > uses are essentially dead code.

+ Min, Jiaqi.

I don't follow firmware development. Min, Jiaqi, could you comment?

-- 
 Kirill A. Shutemov