[Bug dynamic-link/27201] Consider disabling x86-64-v2 support check

["berrange at redhat dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=27201

--- Comment #25 from Daniel Berrange <berrange at redhat dot com> ---
One thing that occurred to me is that QEMU could explore the idea of using of
its CPU model versioning to define a new version 'qemu64-v2' that includes a
more useful modern baseline of feature bits.

There is also a QEMU concept called machine types, which encode a particular
machine ABI. Machine types are versioned too, so when you provision a VM, it is
set use the newest machine type version available at that point in time and
never changes thereafter.  Machine types can associate with CPU versions, to
express what version 'qemu64' will expand to. 

IOW, it ought to be possible to make future machine types from QEMU to
reference the qemu64-v2 CPU model instead of the qemu64-v1 model. One that is
done existing deployed VMs will still be using qem64-v1, but newly deployed VMs
would pick up qemu64-v2. If we can achieve this, it should not involve any
changes to mgmt apps.

The devil is in the detail, but I think it is worth exploring as an option.

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