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

On Wed, 5 Jul 2023 13:26:32 +0100 Daniel P. Berrangé <berrange(a)redhat.com&gt; 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