Re: [Xen-devel] ACPI shutdown unreliable with win7?

[Paul Durrant <Paul.Durrant@xxxxxxxxxx>]

> -----Original Message-----
> From: Ross Philipson [mailto:ross.philipson@xxxxxxxxx]
> Sent: 29 May 2015 16:35
> To: Ian Campbell; Paul Durrant
> Cc: Andrew Cooper; xen-devel; Jan Beulich; Ian Jackson
> Subject: Re: [Xen-devel] ACPI shutdown unreliable with win7?
> 
> On 05/29/2015 11:11 AM, Ian Campbell wrote:
> > On Fri, 2015-05-29 at 16:06 +0100, Paul Durrant wrote:
> >>> FWIW We appear to wait 200s, if we were seeing failures due to
> windows
> >>> update then I'd be inclined to extend that, but I think right now that
> >>> would be premature, unless WU happens with no status on the screen.
> >>>
> >>
> >> No, you'd see something. Perhaps our ACPI lid/power switch code is just
> buggy then?
> >
> > It seems to work reliably for the WinXP tests, FWIW...
> >
> > Ian.
> >
> 
> One thing I find confusing is that the firmware code does not even have
> a power button device (PNP0C0C) or the fixed feature power button that
> is enabled in the FADT (flag == PWR_BUTTON bit 4). So I don't see how
> the shutdown is purely an ACPI function. Is there something else to the
> story? Is it relying on PV tools to do it?
> 

Xen (and QEMU seemingly) implement the 'Fixed Power Button' (section 
4.8.2.2.1.1 on my spec) and this requires the PWR_BUTTON flag to be clear 
(according table 4-13). It also does not require a power button device to be 
implemented (which is presumably why this way of doing it was chosen).

  Paul

> Ross
> 
> >
> >
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> >
> 
> 
> --
> Ross Philipson

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