Re: [Qemu-devel] [PATCH v3 2/2] docs: update ivshmem device spec

[Stefan Hajnoczi]

On Tue, Aug 26, 2014 at 01:04:30PM +0200, Paolo Bonzini wrote:
> Il 26/08/2014 08:47, David Marchand ha scritto:
> > 
> > Using a version message supposes we want to keep ivshmem-server and QEMU
> > separated (for example, in two distribution packages) while we can avoid
> > this, so why would we do so ?
> > 
> > If we want the ivshmem-server to come with QEMU, then both are supposed
> > to be aligned on your system.
> 
> What about upgrading QEMU and ivshmem-server while you have existing
> guests?  You cannot restart ivshmem-server, and the new QEMU would have
> to talk to the old ivshmem-server.

Version negotiation also helps avoid confusion if someone combines
ivshmem-server and QEMU from different origins (e.g. built from source
and distro packaged).

It's a safeguard to prevent hard-to-diagnose failures when the system is
misconfigured.

Stefan

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