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 12:45:31 -0400 Konrad Rzeszutek Wilk 
<konrad.wilk@xxxxxxxxxx> wrote:
> For the emulated path I am not entirely sure how the ACPI path works
> when a guest hasn't initialized its ACPI machinery. I would think the
> ACPI SCI would be triggered, but it might not be since the ACPI AML
> has no way of running (as the OS hasn't even started reading it). In
> which case the emulated path ought to use a fallback, whatever that is.
> But I am not sure if there is a fallback except "yanking the power" -
> which I think is what normal machines do if you hold the power off button
> for more than 3 seconds.
The problem isn't that a shutdown doesn't work if there are no drivers
for it. The problem is that if you issue a shutdown when there are
no drivers, then later issue a shutdown when there are drivers, it
still doesn't work.

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).

--
Alex Bligh

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