linux-kernel - Re: [PATCH v7 03/14] mm: Introduce memfile

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Message-ID: <20220811133914.GC916119@chaop.bj.intel.com>
Date:   Thu, 11 Aug 2022 21:39:14 +0800
From:   Chao Peng <chao.p.peng@...ux.intel.com>
To:     Quentin Perret <qperret@...gle.com>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        David Hildenbrand <david@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-api@...r.kernel.org,
        linux-doc@...r.kernel.org, qemu-devel@...gnu.org,
        linux-kselftest@...r.kernel.org,
        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>,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
        luto@...nel.org, jun.nakajima@...el.com, dave.hansen@...el.com,
        ak@...ux.intel.com, aarcange@...hat.com, ddutile@...hat.com,
        dhildenb@...hat.com, Michael Roth <michael.roth@....com>,
        mhocko@...e.com, Muchun Song <songmuchun@...edance.com>,
        Will Deacon <will@...nel.org>, Fuad Tabba <tabba@...gle.com>
Subject: Re: [PATCH v7 03/14] mm: Introduce memfile_notifier

On Thu, Aug 11, 2022 at 12:27:56PM +0000, Quentin Perret wrote:
> +CC Fuad
> 
> On Wednesday 10 Aug 2022 at 14:38:43 (+0000), Sean Christopherson wrote:
> > > I understand Sean's suggestion about abstracting, but if the new name
> > > makes it harder to grasp and there isn't really an alternative to memfd
> > > in sight, I'm not so sure I enjoy the tried abstraction here.
> > 
> > ARM's pKVM implementation is potentially (hopefully) going to switch to this API
> > (as a consumer) sooner than later.  If they anticipate being able to use memfd,
> > then there's unlikely to be a second backing type any time soon.
> > 
> > Quentin, Will?
> 
> Yep, Fuad is currently trying to port the pKVM mm stuff on top of this
> series to see how well it fits, so stay tuned.

Good to hear that.

>I think there is still
> some room for discussion around page conversions (private->shared etc),
> and we'll need a clearer idea of what the code might look like to have a
> constructive discussion,

That's fine. Looking forward to your feedbacks.

>but so far it does seem like using a memfd (the
> new private one or perhaps just memfd_secret, to be discussed) + memfd
> notifiers is a promising option.

If it still memfd (even memfd_secret), maybe we can use the name
memfd_notifier?

Chao