linux-kernel - Re: [PATCH RFC v1 0/2] VM fork detection for RNG

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Date:   Thu, 24 Feb 2022 11:57:34 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Daniel P. Berrangé <berrange@...hat.com>
Cc:     Laszlo Ersek <lersek@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux Crypto Mailing List <linux-crypto@...r.kernel.org>,
        QEMU Developers <qemu-devel@...gnu.org>,
        KVM list <kvm@...r.kernel.org>, linux-s390@...r.kernel.org,
        adrian@...ity.io, "Woodhouse, David" <dwmw@...zon.co.uk>,
        "Catangiu, Adrian Costin" <acatan@...zon.com>, graf@...zon.com,
        Colm MacCarthaigh <colmmacc@...zon.com>,
        "Singh, Balbir" <sblbir@...zon.com>,
        "Weiss, Radu" <raduweis@...zon.com>, Jann Horn <jannh@...gle.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Theodore Ts'o" <tytso@....edu>,
        Igor Mammedov <imammedo@...hat.com>, ehabkost@...hat.com,
        ben@...portsystems.com, "Michael S. Tsirkin" <mst@...hat.com>,
        "Richard W.M. Jones" <rjones@...hat.com>
Subject: Re: [PATCH RFC v1 0/2] VM fork detection for RNG

On Thu, Feb 24, 2022 at 11:56 AM Daniel P. Berrangé <berrange@...hat.com> wrote:
> IIRC this part of the QEMU doc was making an implicit assumption
> about the way QEMU is to be used by mgmt apps doing snapshots.
>
> Instead of using the 'loadvm' command on the existing running QEMU
> process, the doc seems to tacitly expect the management app will
> throwaway the existing QEMU process and spawn a brand new QEMU
> process to load the snapshot into, thus getting the new GUID on
> the QEMU command line.

Right, exactly. The "there are no known use cases" bit I think just
forgot about one very common use case that perhaps just wasn't in use
by the original author. So I'm pretty sure this remains a QEMU bug.

Jason