linux-kernel - Re: propagating vmgenid outward and upward

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Message-ID: <CAHmME9oGcp7HNLeieptMKztgg7Fq4MnOuAEsiFJxsLbmjSuFCw@mail.gmail.com>
Date:   Tue, 1 Mar 2022 19:24:11 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        KVM list <kvm@...r.kernel.org>,
        QEMU Developers <qemu-devel@...gnu.org>,
        linux-hyperv@...r.kernel.org,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        Alexander Graf <graf@...zon.com>,
        "Michael Kelley (LINUX)" <mikelley@...rosoft.com>,
        adrian@...ity.io, Laszlo Ersek <lersek@...hat.com>,
        Daniel P. Berrangé <berrange@...hat.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Jann Horn <jannh@...gle.com>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Brown, Len" <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
        Linux PM <linux-pm@...r.kernel.org>,
        Colm MacCarthaigh <colmmacc@...zon.com>,
        "Theodore Ts'o" <tytso@....edu>, Arnd Bergmann <arnd@...db.de>
Subject: Re: propagating vmgenid outward and upward

Hi Greg,

On Tue, Mar 1, 2022 at 7:01 PM Greg KH <gregkh@...uxfoundation.org> wrote:
> A notifier block like this makes sense, but why tie onto the PM_ stuff?
> This isn't power management issues, it's a system-wide change that I am
> sure others will want to know about that doesn't reflect any power
> changes.
>
> As much as I hate adding new notifiers in the kernel, that might be all
> you need here.

You might indeed be right. I guess I was thinking that "resuming from
suspend" and "resuming from a VM fork" are kind of the same thing.
There _is_ a certain kind of similarity between the two. I was hoping
if the similarity was a strong enough one, maybe it'd make sense to do
them together rather than adding another notifier. But I suppose you
disagree, and it sounds like Rafael might too --
<https://lore.kernel.org/lkml/CAJZ5v0g+GihH_b9YvwuHzdrUVNGXOeabOznDC1vK6qLi8gtSTQ@mail.gmail.com/>.
Code-wise for me with WireGuard it's of course appealing to treat them
the same, since it's like a one line change, but if I need to add a
new notifier call there, it's not the end of the world.

Jason