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Message-ID: <YvT1zOQtTQl2t300@google.com>
Date: Thu, 11 Aug 2022 12:27:56 +0000
From: Quentin Perret <qperret@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>
Cc: David Hildenbrand <david@...hat.com>,
Chao Peng <chao.p.peng@...ux.intel.com>, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-mm@...ck.org,
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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>,
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Andrew Morton <akpm@...ux-foundation.org>,
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"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>,
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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
+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. 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, 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.
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