linux-kernel - Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM guest private memory

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Date:   Mon, 22 Aug 2022 18:25:41 -0700
From:   Isaku Yamahata <isaku.yamahata@...il.com>
To:     Michael Roth <michael.roth@....com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        "Gupta, Pankaj" <pankaj.gupta@....com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        "Nikunj A. Dadhania" <nikunj@....com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H . Peter Anvin" <hpa@...or.com>,
        Hugh Dickins <hughd@...gle.com>,
        Jeff Layton <jlayton@...nel.org>,
        "J . Bruce Fields" <bfields@...ldses.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Shuah Khan <shuah@...nel.org>, Mike Rapoport <rppt@...nel.org>,
        Steven Price <steven.price@....com>,
        "Maciej S . Szmigiero" <mail@...iej.szmigiero.name>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>, luto@...nel.org,
        jun.nakajima@...el.com, dave.hansen@...el.com, ak@...ux.intel.com,
        david@...hat.com, aarcange@...hat.com, ddutile@...hat.com,
        dhildenb@...hat.com, Quentin Perret <qperret@...gle.com>,
        mhocko@...e.com, Muchun Song <songmuchun@...edance.com>,
        bharata@....com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linux-kselftest@...r.kernel.org,
        linux-api@...r.kernel.org, linux-doc@...r.kernel.org,
        qemu-devel@...gnu.org, linux-fsdevel@...r.kernel.org,
        isaku.yamahata@...il.com
Subject: Re: [PATCH v7 00/14] KVM: mm: fd-based approach for supporting KVM
 guest private memory

On Wed, Aug 17, 2022 at 10:27:19AM -0500,
Michael Roth <michael.roth@....com> wrote:

> > I think the best approach is to turn KVM_TDX_INIT_MEM_REGION into a generic
> > vCPU-scoped ioctl() that allows userspace to pre-map guest memory.  Supporting
> > initializing guest private memory with a source page can be implemented via a
> > flag.  That also gives KVM line of sight to in-place "conversion", e.g. another
> > flag could be added to say that the dest is also the source.
> 
> So is this proposed ioctl only intended to handle the initial encrypted
> payload, and the KVM_MEMORY_ENCRYPT_{REG,UNREG}_REGION ioctls would
> still be used for conversions post-boot?

Yes.  It is called before running any vcpu.  At run time (after running vcpus),
KVM_MEMORY_ENCRYPT_{REG,UNREG}_REGION is used.
-- 
Isaku Yamahata <isaku.yamahata@...il.com>