linux-kernel - Re: [PATCH v9 5/6] x86/sev: Add SNP-specific unaccepted memory support

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Message-ID: <20230912121719.6i6ojvbb6ptw2i2l@box.shutemov.name>
Date:   Tue, 12 Sep 2023 15:17:19 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Tom Lendacky <thomas.lendacky@....com>
Cc:     Christopher Schramm <linux@...hramm.eu>,
        linux-kernel@...r.kernel.org, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Michael Roth <michael.roth@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Dionna Glaze <dionnaglaze@...gle.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH v9 5/6] x86/sev: Add SNP-specific unaccepted memory
 support

On Thu, Sep 07, 2023 at 11:50:15AM -0500, Tom Lendacky wrote:
> >  From a quick look at
> > 
> >    [PATCHv14 9/9] x86/tdx: Add unaccepted memory support
> > 
> > it actually seems very similar for INTEL_TDX_GUEST.
> > 
> > Ideally UNACCEPTED_MEMORY would not assume EFI either, but the
> > implementation actually clearly does.
> 
> @Kirill, is this something you are interested in having as well?

Unaccepted memory is an EFI feature I don't see how UNACCEPTED_MEMORY can
be untied from EFI. If there's other (non-EFI) environment that has
similar concept, sure we can try to generalize it beyond EFI.

TDX guest is only runs with EFI firmware so far, so depending onf EFI and
EFI_STUB is fine for TDX>

-- 
  Kiryl Shutsemau / Kirill A. Shutemov