linux-kernel - Re: [PATCH] drivers/virt: vmgenid: add vm generation id driver

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Message-ID: <9CB99FC7-3EDF-488E-B52C-DE0368A4BC81@amazon.com>
Date:   Tue, 20 Oct 2020 16:54:24 +0000
From:   "Catangiu, Adrian Costin" <acatan@...zon.com>
To:     "Graf (AWS), Alexander" <graf@...zon.de>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Jann Horn <jannh@...gle.com>
CC:     Willy Tarreau <w@....eu>,
        "MacCarthaigh, Colm" <colmmacc@...zon.com>,
        "Andy Lutomirski" <luto@...nel.org>,
        "Theodore Y. Ts'o" <tytso@....edu>,
        "Eric Biggers" <ebiggers@...nel.org>,
        "open list:DOCUMENTATION" <linux-doc@...r.kernel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        "open list:VIRTIO GPU DRIVER" 
        <virtualization@...ts.linux-foundation.org>,
        "Woodhouse, David" <dwmw@...zon.co.uk>,
        "bonzini@....org" <bonzini@....org>,
        "Singh, Balbir" <sblbir@...zon.com>,
        "Weiss, Radu" <raduweis@...zon.com>,
        "oridgar@...il.com" <oridgar@...il.com>,
        "ghammer@...hat.com" <ghammer@...hat.com>,
        Jonathan Corbet <corbet@....net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        "Qemu Developers" <qemu-devel@...gnu.org>,
        KVM list <kvm@...r.kernel.org>,
        "Michal Hocko" <mhocko@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        "Pavel Machek" <pavel@....cz>,
        Linux API <linux-api@...r.kernel.org>,
        "Christian Borntraeger" <borntraeger@...ibm.com>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "Mathiske, Bernd" <mathiske@...zon.com>,
        "Hohensee, Paul" <hohensee@...zon.com>
Subject: Re: [PATCH] drivers/virt: vmgenid: add vm generation id driver

Hi all,

On 17/10/2020, 21:09, "Graf (AWS), Alexander" <graf@...zon.de> wrote:
    
    On 17.10.20 15:24, Jason A. Donenfeld wrote:
    > 
    > After discussing this offline with Jann a bit, I have a few general
    > comments on the design of this.
    > 
    > First, the UUID communicated by the hypervisor should be consumed by
    > the kernel -- added as another input to the rng -- and then userspace
    
    We definitely want a kernel internal notifier as well, yes :).

What would be a generic event trigger mechanism we could use from a kernel
module/driver for triggering rng reseed (possibly adding the uuid to the mix
as well)?

  




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