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[Xen-devel] xl vcpu-set in HVM domU fails change cpu online count

  • To: xen-devel@xxxxxxxxxxxxxxxxxxxx
  • From: Olaf Hering <olaf@xxxxxxxxx>
  • Date: Tue, 13 Feb 2018 13:47:42 +0100
  • Delivery-date: Tue, 13 Feb 2018 12:48:02 +0000
  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>

xl vcpu-set with a HVM domU sends an ACPI event to do hot-add of cpus. But if 
the vcpu count is decreased the domU does not offline any cpu. So far the only 
way to enforce offlining is to process the output of 'xenstore-watch cpu'.

Why is HVM excluded in drivers/xen/cpu_hotplug.c:setup_vcpu_hotplug_event()? I 
think that would be the place to receive notifications from xenstore about cpus 
being offlined/onlined.


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