[RFC PATCH 3/3] powerpc/pseries/vas: Use migration_in_progress to disable DLPAR
Haren Myneni
haren at linux.ibm.com
Tue Jan 18 20:28:40 AEDT 2022
On Fri, 2022-01-14 at 11:59 -0600, Nathan Lynch wrote:
> Haren Myneni <haren at linux.ibm.com> writes:
>
> > Before migration starts, all secondary CPUs will be offline which
> > can invoke VAS DLPAR event.
>
> I don't understand this statement, so I can't evaluate the patch. The
> current LPM implementation does not offline any CPUs.
Thanks for your comment. My mistake..
VAS notifier with of_reconfig_notifier_register() is called during
migration for other events. VAS notifier has a bug (
https://lists.ozlabs.org/pipermail/linuxppc-dev/2021-December/238333.html
) and will fix it:
if ((action == OF_RECONFIG_ATTACH_NODE) ||
(action == OF_RECONFIG_DETACH_NODE))
intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
&len);
As the current LPM notifier does not freeze the system, thought of
ignoring DLPAR CPU hotplug event with this migration_in_progress flag.
I will fix this as well and repost DLPAR NXGZIP series.
Thanks
Haren
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