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From: Thomas Huth <thuth@redhat.com>
Message-ID: <c01f4488-3b67-dd07-66d2-eb00241a3c88@redhat.com>
Date: Thu, 6 Jul 2017 13:12:03 +0200
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Subject: Re: [Qemu-devel] change x86 default machine type to Q35?
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To: "Daniel P. Berrange" <berrange@redhat.com>
Cc: Fam Zheng <famz@redhat.com>, Chao Peng <chao.p.peng@linux.intel.com>, "Tian, Kevin" <kevin.tian@intel.com>, qemu-devel@nongnu.org

On 06.07.2017 13:06, Daniel P. Berrange wrote:
> On Thu, Jul 06, 2017 at 01:00:53PM +0200, Thomas Huth wrote:
>> On 06.07.2017 12:49, Daniel P. Berrange wrote:
>> [...]
>>> This avoids the user having problems with guest ABI silently changing
>>> behind their back, or migration suddenly failing to load vm state,
>>
>> For proper migration, you've got to specify the right versioned machine
>> type anyway, so that should not be an issue here.
> 
> That's only true if you have mis-matched QEMU releases on each host.
> If you know you have the same QEMU release everywhere, there's no
> need for versioned machine types.
Sure, but in case you use the same QEMU release on both ends, there
should also be no clash with the default machine type here.

 Thomas