[libvirt] [PATCH] bhyve: implement domainShutdown

[Daniel P. Berrange]

On Mon, Mar 28, 2016 at 10:27:18AM +0300, Roman Bogorodskiy wrote:
> Bhyve supports ACPI shutdown by issuing SIGTERM signal to the bhyve
> process. Add the bhyveDomainShutdown() function and
> virBhyveProcessShutdown() helper function that just sends SIGTERM to
> VM's bhyve process. If a guest supports ACPI shutdown then process
> will be terminated and this event will be noticed by the bhyve monitor
> code that will handle setting proper status and clean up VM's resources.
> 
> Also, remove a warning in domainDestroy in case if
> virProcessKillPainfully() returns 1, meaning that it killed process
> using SIGKILL. This behavior should be expected when using 'destroy'.

Hmm, so destroy is supposed to be equivalent to physically removing
the power plug.  The existing code is calling virProcessShutdownPainfully
which starts by sending SIGTERM and then switches to SIGKILL.  So this
means that your virDomainDestroy implementation is mistakenly trying todo
a graceful shutdown initially and then switching to hard shutdown after a
bit of a delay.

Has bhyve always used SIGTERM to trigger ACPI shutdown, or is this a
recent addition ?  I would tend to suggest we need to go straight to
SIGKILL for virDomainDestroy to avoid doing ACPI shutdown when we don't
want it.

It is kind of a shame they used SIGTERM for triggering ACPI imho but
oh well.

Regards,
Daniel
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