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Re: [Qemu-devel] [PATCH] target-ppc: Add @cpu_dt_id into migration strea


From: Alexey Kardashevskiy
Subject: Re: [Qemu-devel] [PATCH] target-ppc: Add @cpu_dt_id into migration stream
Date: Thu, 27 Mar 2014 23:49:05 +1100
User-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0

On 03/27/2014 11:37 PM, Andreas Färber wrote:
> Am 27.03.2014 03:41, schrieb Alexey Kardashevskiy:
>> This should prevent the destination guest from misbehaving when
>> the threads number is different in "-smp" command.
> 
> Sorry, I don't understand. When migrating, surely -smp needs to be the
> same on source and destination, so how can they differ?


The idea is that "-smp" does not migrate and if we run source and
destination guests with different numbers in -smp, we end up with weird
machine because interrupt server properties (gserver?) in the device tree
are different and no reconfiguration happens (no such mechanism as I know)
the whole XICS behaves different.

The patch just prevents migration from succeeding which seems better.

-- 
Alexey



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