linux-kernel - Re: [PATCH v4] virt: vmgenid: introduce driver for reinitializing RNG on VM fork

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Message-ID: <5a196de5-d7cb-d462-2292-af05907d3544@amazon.com>
Date:   Fri, 25 Feb 2022 16:57:41 +0100
From:   Alexander Graf <graf@...zon.com>
To:     "Jason A. Donenfeld" <Jason@...c4.com>
CC:     Ard Biesheuvel <ardb@...nel.org>, KVM list <kvm@...r.kernel.org>,
        "Linux Crypto Mailing List" <linux-crypto@...r.kernel.org>,
        <linux-hyperv@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        <adrian@...ity.io>, <ben@...portsystems.com>,
        Daniel P. Berrangé <berrange@...hat.com>,
        "Colm MacCarthaigh" <colmmacc@...zon.com>,
        Dexuan Cui <decui@...rosoft.com>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        Eric Biggers <ebiggers@...nel.org>,
        Eduardo Habkost <ehabkost@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "Igor Mammedov" <imammedo@...hat.com>,
        Jann Horn <jannh@...gle.com>,
        KY Srinivasan <kys@...rosoft.com>,
        Laszlo Ersek <lersek@...hat.com>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "QEMU Developers" <qemu-devel@...gnu.org>,
        "Weiss, Radu" <raduweis@...zon.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "Theodore Y. Ts'o" <tytso@....edu>, Wei Liu <wei.liu@...nel.org>
Subject: Re: [PATCH v4] virt: vmgenid: introduce driver for reinitializing RNG
 on VM fork


On 25.02.22 16:43, Jason A. Donenfeld wrote:
>
> Hi Alex,
>
> On Fri, Feb 25, 2022 at 04:22:54PM +0100, Alexander Graf wrote:
>> I don't understand the rush here. This had been sitting on the ML for 1
>> year - and now suddenly talking the match through properly and getting
>> VMGenID spec compatible matching support into the ACPI core is a
>> problem? What did I miss? :)
> I don't think this is a question about speed. Ard doesn't like the spec.
> You like the feature more than you dislike the spec. Apparently that
> means there's a disagreement.
>
> As I mentioned earlier, I'd encourage you to send a patch to the ACPI
> people and let them decide. If that gets in, then I'm fine with
> modifying vmgenid to meet the spec and take advantage of the change
> you'll be making to the ACPI code. If it is rejected by the ACPI people,
> and consequently Linux isn't able to match on _CID, then I guess we'll
> have the next best thing, which is "well, it still works on QEMU."
> Hopefully you'll convince them. Feel free to CC me on that patch.


I agree with that approach and CC'ed you on the ACPI patch :). Let's 
explore all options to match against _CID before we give up.


Alex





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