[libvirt PATCH v3 5/5] qemu: enable asynchronous teardown on s390x hosts by default

[Thomas Huth]

On 05/07/2023 14.46, Claudio Imbrenda wrote:
> On Wed, 5 Jul 2023 13:26:32 +0100
> Daniel P. Berrangé <berrange at redhat.com> wrote:
> 
> [...]
> 
>>>> I rather think mgmt apps need to explicitly opt-in to async teardown,
>>>> so they're aware that they need to take account of delayed RAM
>>>> availablity in their accounting / guest placement logic.
>>>
>>> what would you think about enabling it by default only for guests that
>>> are capable to run in Secure Execution mode?
>>
>> IIUC, that's basically /all/ guests if running on new enough hardware
>> with prot_virt=1 enabled on the host OS, so will still present challenges
>> to mgmt apps needing to be aware of this behaviour AFAICS.
> 
> I think there is some fencing still? I don't think it's automatic

Could we maybe enable it by default if the user specified the

  <launchSecurity type='s390-pv'/>

tag?

  Thomas