Re: [PATCH v7 03/14] mm: Introduce memfile_notifier

Chao Peng
2022-08-11T13:44:13Z

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