Re: [Qemu-devel] [PATCH 0/2] target-i386: "custom" CPU model + script to dump existing CPU models

[Andreas Färber]

Am 24.06.2015 um 16:19 schrieb Michael S. Tsirkin:
> On Wed, Jun 24, 2015 at 11:16:51AM -0300, Eduardo Habkost wrote:
>>> IMHO -M pc is not supposed to mean "can break at any time".
>>
>> It means "it may have new host-side requirements and may become runnable
>> in your host (or require additional command-line flags to run) at any time".
> 
> That would be pretty bad. I don't think we ever had such cases in practice.

Why is that bad or unexpected? If you install new software, it may have
new dependencies. QEMU would be no different from other software there.

Yesterday Eduardo said it was about having a fixed version installed and
therein switching from a legacy machine to a newer machine. In that case
the dependencies existed ever since installation but were not
immediately visible to the end user due to our stability guarantees.

Andreas

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