linux-kernel - Re: [PATCHv12 9/9] x86/tdx: Add unaccepted memory support

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Message-ID: <20230531005837.GA1808127@ls.amr.corp.intel.com>
Date:   Tue, 30 May 2023 17:58:37 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Borislav Petkov <bp@...en8.de>, 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,
        isaku.yamahata@...il.com
Subject: Re: [PATCHv12 9/9] x86/tdx: Add unaccepted memory support

On Fri, May 19, 2023 at 02:14:34AM +0300,
"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com> wrote:

> Hookup TDX-specific code to accept memory.
> 
> Accepting the memory is the same process as converting memory from
> shared to private: kernel notifies VMM with MAP_GPA hypercall and then
> accept pages with ACCEPT_PAGE module call.
> 
> THE implementation in core kernel uses tdx_enc_status_changed(). It
> already used for converting memory to shared and back for I/O
> transactions.

Because unaccepted memory reported in e820 means private[1], MAP_GPA isn't
needed to accept memory. (Or are you seeing TDX KVM/qemu issue?)

[1]TDX Virtual Firmware Design Guide.
7.2.1 Memroy Type in TD Resrouce HOB. Table 7-1: Mmeory Typein TD Resource HOB.
-- 
Isaku Yamahata <isaku.yamahata@...il.com>