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From: Paul Brook <paul@codesourcery.com>
Subject: Re: [Qemu-devel] [PATCH v2] make windows notice media change
Date: Thu, 30 Jul 2009 13:27:12 +0100
References: <20090729120719.GN30449@redhat.com>
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To: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Cc: Filip Navara <filip.navara@gmail.com>, "qemu-devel@nongnu.org" <qemu-devel@nongnu.org>, Gleb Natapov <gleb@redhat.com>

> Think about a sysadmin that kept his server running for the last X years
> in a VM using xen (or kvm) and now wants to upgrade his host.
> Is he supposed to reboot the VM as well?
> Are we seriously suggesting that everytime the hypervisor is upgraded
> the sysadmin must reboot all his VMs?

I'd expect that stable branches would make effort to not break the 
snapshot/migration format.

I think it's entirely reasonable to require a VM reboot when you do a major 
hypervisor upgrade. I'd expect this to be the least of your problems.

Paul