linux-kernel - Re: [PATCH 2/4] xen/manage: Poweroff forcefully if user-space is not yet up.

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Date:	Thu, 21 Nov 2013 11:33:49 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	<Ian.Campbell@...rix.com>, <xen-devel@...ts.xenproject.org>,
	<linux-kernel@...r.kernel.org>, <JBeulich@...e.com>,
	<boris.ostrovsky@...cle.com>
Subject: Re: [PATCH 2/4] xen/manage: Poweroff forcefully if user-space is
 not yet up.

On 08/11/13 17:38, Konrad Rzeszutek Wilk wrote:
> The user can launch the guest in this sequence:
> 
> xl create -p /vm.cfg	[launch, but pause it]
> xl shutdown latest	[sets control/shutdown=poweroff]
> xl unpause latest
> xl console latest	[and see that the guest has completely
> ignored the shutdown request]
> 
> In reality the guest hasn't ignored it. It registers a watch
> and gets a notification that there is value. It then calls
> the shutdown_handler which ends up calling orderly_shutdown.

Is this really a bug?.

>From the xl(1) man page.

  shutdown [OPTIONS] -a|domain-id
     Gracefully shuts down a domain.  This coordinates with the
     domain OS to perform graceful shutdown, so there is no guarantee
     that it will succeed, and may take a variable length of time
     depending on what services must be shutdown in the domain.

Seems like ignoring a shutdown request when the guest cannot yet
shutdown gracefully is the expected behaviour.

This also doesn't seem sufficient.  SYSTEM_RUNNING is set prior to
starting init in an initramfs and orderly_power_off(false) will still
likely fail at this point.

David
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