From mboxrd@z Thu Jan  1 00:00:00 1970
From: Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [Xen-devel] [RFC] Hypervisor RNG and enumeration
Date: Wed, 29 Oct 2014 19:22:43 +0100
Message-ID: <54513073.9050900@redhat.com>
References: <CALCETrUuSApjNk+xdB1XEPH+Lz2PGY0gnreHwx5Z6xQ0Vj74tw@mail.gmail.com>
	<21585.1101.912184.610549@mariner.uk.xensource.com>
	<CALCETrWup0JS6a8CJcHLtrqHtKfMeA9ZwRABUY2F88z0qwkOVw@mail.gmail.com>
	<80e17627b82a4bb7bbdc8b8c56a89626@DM2PR03MB592.namprd03.prod.outlook.com>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <virtualization-bounces@lists.linux-foundation.org>
In-Reply-To: <80e17627b82a4bb7bbdc8b8c56a89626@DM2PR03MB592.namprd03.prod.outlook.com>
List-Unsubscribe: <https://lists.linuxfoundation.org/mailman/options/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=unsubscribe>
List-Archive: <http://lists.linuxfoundation.org/pipermail/virtualization/>
List-Post: <mailto:virtualization@lists.linux-foundation.org>
List-Help: <mailto:virtualization-request@lists.linux-foundation.org?subject=help>
List-Subscribe: <https://lists.linuxfoundation.org/mailman/listinfo/virtualization>,
	<mailto:virtualization-request@lists.linux-foundation.org?subject=subscribe>
Sender: virtualization-bounces@lists.linux-foundation.org
Errors-To: virtualization-bounces@lists.linux-foundation.org
To: Jake Oshins <jakeo@microsoft.com>, Andy Lutomirski <luto@amacapital.net>, Ian Jackson <Ian.Jackson@eu.citrix.com>
Cc: Mathew John <mathewj@microsoft.com>, Theodore Ts'o <tytso@mit.edu>, kvm list <kvm@vger.kernel.org>, Gleb Natapov <gleb@kernel.org>, Niels Ferguson <niels@microsoft.com>, Jim Mattson <jmattson@vmware.com>, Linux Virtualization <virtualization@lists.linux-foundation.org>, Doug Covelli <dcovelli@vmware.com>, David Hepkin <davidhep@microsoft.com>, "H. Peter Anvin" <hpa@zytor.com>, "xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>, Alok Kataria <akataria@vmware.com>, John Starks <John.Starks@microsoft.com>
List-Id: virtualization@lists.linuxfoundation.org

On 10/29/2014 05:29 PM, Jake Oshins wrote:
> Just as a point of clarification, the VM Generation ID changes (at
> least in the Hyper-V implementation) only when the VM may have
> observed a different future, as when a VM backup is restored, a
> checkpoint is applied, etc.  It does not change during migration,
> when the VM is suspended or when it is rebooted.  I've heard
> anecdotes from application vendors saying that there is some other
> hypervisor that actually does change the ID at these moments and they
> wanted us to us to fix that, until I explained that I only control
> Hyper-V.

This is indeed the only reasonable way you can read the vmgenid spec.

Paolo