linux-kernel - Re: [PATCH v13 16/35] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for guest-specific backing memory

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Message-ID: <CABgObfbLonVYk2WE4TC6-J_0ShanY7TbcLXStxji=XDU+9qQ7g@mail.gmail.com>
Date:   Tue, 31 Oct 2023 23:18:04 +0100
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Fuad Tabba <tabba@...gle.com>, Marc Zyngier <maz@...nel.org>,
        Oliver Upton <oliver.upton@...ux.dev>,
        Huacai Chen <chenhuacai@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Anup Patel <anup@...infault.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>, kvm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
        linux-mips@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm-riscv@...ts.infradead.org, linux-riscv@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Xiaoyao Li <xiaoyao.li@...el.com>,
        Xu Yilun <yilun.xu@...el.com>,
        Chao Peng <chao.p.peng@...ux.intel.com>,
        Jarkko Sakkinen <jarkko@...nel.org>,
        Anish Moorthy <amoorthy@...gle.com>,
        David Matlack <dmatlack@...gle.com>,
        Yu Zhang <yu.c.zhang@...ux.intel.com>,
        Isaku Yamahata <isaku.yamahata@...el.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vishal Annapurve <vannapurve@...gle.com>,
        Ackerley Tng <ackerleytng@...gle.com>,
        Maciej Szmigiero <mail@...iej.szmigiero.name>,
        David Hildenbrand <david@...hat.com>,
        Quentin Perret <qperret@...gle.com>,
        Michael Roth <michael.roth@....com>,
        Wang <wei.w.wang@...el.com>,
        Liam Merwick <liam.merwick@...cle.com>,
        Isaku Yamahata <isaku.yamahata@...il.com>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v13 16/35] KVM: Add KVM_CREATE_GUEST_MEMFD ioctl() for
 guest-specific backing memory

On Tue, Oct 31, 2023 at 11:13 PM Sean Christopherson <seanjc@...gle.com> wrote:
> On Tue, Oct 31, 2023, Fuad Tabba wrote:
> > On Fri, Oct 27, 2023 at 7:23 PM Sean Christopherson <seanjc@...gle.com> wrote:
> Since we now know that at least pKVM will use guest_memfd for shared memory, and
> odds are quite good that "regular" VMs will also do the same, i.e. will want
> guest_memfd with the concept of private memory, I agree that we should avoid
> PRIVATE.
>
> Though I vote for KVM_MEM_GUEST_MEMFD (or KVM_MEM_GUEST_MEMFD_VALID or
> KVM_MEM_USE_GUEST_MEMFD).  I.e. do our best to avoid ambiguity between referring
> to "guest memory" at-large and guest_memfd.

I was going to propose KVM_MEM_HAS_GUESTMEMFD.  Any option
is okay for me so, if no one complains, I'll go for KVM_MEM_GUESTMEMFD
(no underscore because I found the repeated "_MEM" distracting).

Paolo