Re: Early ACPI events prevent subsequent ACPI functionality on xen 4.3 + HVM domU

[George Dunlap <george.dunlap@eu.citrix.com>]

On 05/21/2013 04:36 PM, George Dunlap wrote:
> On 05/21/2013 04:17 PM, Alex Bligh wrote:
>>
>>
>> --On 21 May 2013 15:34:34 +0100 George Dunlap
>> <george.dunlap@eu.citrix.com> wrote:
>>
>>> But the problem actually has nothing to do with ACPI -- it's the PV
>>> shutdown command that is getting lost after the driver registers
>>> HVM_PARAM_CALLBACK_IRQ but before something else comes up that starts
>>> watching ../control/shutdown.
>>
>> I'm puzzled as to why you say that as the problem does not appear
>> without ACPI in the xl.conf file.
>
> I can still get the same effect -- the only difference for me seems to
> be that the "window" in which I can send a shutdown with no effect it is
> shorter.  Maybe ACPI causes the extra few seconds at boot which makes it
> more likely you're going to hit it?

If you can't trigger it manually, try something like this:

xl create dom.cfg ; while ! xl shutdown dom ; do sleep 1 ; done

Before PARAM_CALLBACK_IRQ is set, "xl shutdown dom" will fail, so this 
will keep trying every 1 second until it succeeds.  Since this is most 
likely within 1 second of PARAM_CALLBACK_IRQ being set, it should be 
within the window where the watch isn't set yet (or whatever it is that 
makes domU responsive to the PV shutdown commands).

It works reliably for me with acpi=0.

  -George