Re: [Xen-devel] Early ACPI events prevent subsequent ACPI functionality on xen 4.3 + HVM domU

[Alex Bligh <alex@xxxxxxxxxxx>]

Konrad,

--On 21 May 2013 15:33:44 -0400 Konrad Rzeszutek Wilk 
<konrad.wilk@xxxxxxxxxx> wrote:
> OK, but we should be able to fix this in Linux by doing something along
> these lines (not compile tested):
Yep. Not much use on guests with current OS's though :-(

> > Somewhat to my surprise we are using the PV/PVHVM route not the ACPI
> > route (libxl_domain_shutdown / xl shutdown) so the subject line would
> > appear to be inaccurate.
> >
> > The second problem is that ACPI shutdown appears not to work reliably
> > either (whenever issued).
> Right and that one would require some more investigation as I think it
> works as it would work on baremetal.
Diana thinks it does not - i.e. when you have a fully booted running Ubuntu
OS, does not reliably cause shutdown (as per Diana's testing), whether
or not you send an a trigger during early boot. Pressing the hardware
button does one would presume.

> Meaning if you press the 'shutdown'
> button and only BIOS is running it will ignore you. This would
> be similar to the 'xl trigger' call that hopefully invokes the ACPI
> signal.
>
> You have to hold it for 5 seconds or so for the BIOS to do anything
> about it.
I'm fine with ACPI shutdown not working before ACPI's been initialised,
in BIOS or whatever, so long as it works it has been booted!

--
Alex Bligh

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