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On 03/25/2015 10:15 PM, Rui Chen wrote:
> Hi all:
>
>      I found a discuss about the libvirt shutdown API maybe hang when shutdown
> instance in libvirt community,
> https://www.redhat.com/archives/libvir-list/2015-March/msg01121.html
>
>      I'm not sure that whether there are some risks when we shutdown instance in
> nova.
>
>      Three questions:
>      1. Whether acpi is the default shutdown mode in QEMU/KVM hypervisor when we
> shutdown instance using libvirt?
>      2. Whether acpi is asynchronous mode, and qemu-agent is synchronous mode
> when we shutdown instance?
>      3. If the hypervisor use qemu-agent as default shutdown mode, how we can
> deal the hanging issue?


When shutting down an instance if there is a timeout (controlled by config file 
or system metadata) the code will first attempt a clean shutdown via 
dom.shutdown().  If that doesn't terminate the instance by the time the timeout 
expires, then we'll call virt_dom.destroy().

Chris