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Date: Thu, 15 Feb 2018 17:08:57 +0100
From: Greg Kurz <groug@kaod.org>
Message-ID: <20180215170831.39645199@bahia.lan>
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Subject: Re: [Qemu-devel] [PATCH 5/5] spapr: drop DIV_ROUND_UP() from
 xics_max_server_number()
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To: David Gibson <david@gibson.dropbear.id.au>
Cc: qemu-devel@nongnu.org, qemu-ppc@nongnu.org, Sam Bobroff <sam.bobroff@au1.ibm.com>, Laurent Vivier <lvivier@redhat.com>

On Thu, 15 Feb 2018 15:08:18 +1100
David Gibson <david@gibson.dropbear.id.au> wrote:

> On Wed, Feb 14, 2018 at 08:41:03PM +0100, Greg Kurz wrote:

<snip>

> > 
> > It breaks migration of pre-2.7 machine types with unusual CPU topologies,
> > but I guess this is an acceptable trade-off.  
> 
> No, not really.  Weird topologies are still allowed on old machine
> types for backwards compatibility, and we shouldn't break that.  I
> like the idea of consolidating this calculation, but we can't do it by
> just breaking the older machines (at least not until they're formally
> deprecated).
> 

Heh, I had put this patch at the end because I was expecting you might
nack it :)

Per curiosity, when/how do we decide that an older machine type may be formally
deprecated ?