[PATCH RFC 1/1] qemu: capabilities: disable csske for host cpu

David Hildenbrand david at redhat.com
Fri Mar 11 12:27:37 UTC 2022

On 11.03.22 13:12, Christian Borntraeger wrote:
> Am 11.03.22 um 10:23 schrieb David Hildenbrand:
>> On 11.03.22 10:17, Daniel P. Berrangé wrote:
>>> On Thu, Mar 10, 2022 at 11:17:38PM -0500, Collin Walling wrote:
>>>> CPU models past gen16a will no longer support the csske feature. In
>>>> order to secure migration of guests running on machines that still
>>>> support this feature to machines that do not, let's disable csske
>>>> in the host-model.
>> Sorry to say, removing CPU features is a no-go when wanting to guarantee
>> forward migration without taking care about CPU model details manually
>> and simply using the host model. Self-made HW vendor problem.
> And this simply does not reflect reality. Intel and Power have removed TX
> for example. We can now sit back and please ourselves how we live in our
> world of dreams. Or we can try to define an interface that deals with
> reality and actually solves problems.

Ehm, so, I spell out the obvious and get such a reaction? Okay, thank you.

See my other reply, maybe we want a different kind of "host-model" from

It's Friday and I'm not particularly motivated to participate further in
this discussion today. So I'm going to step away for today, please
myself and live in a world of dreams.


David / dhildenb

More information about the libvir-list mailing list