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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 29.05.15 at 17:34, <Paul.Durrant@xxxxxxxxxx> wrote:
>> From: Paul Durrant
>> Sent: 29 May 2015 16:07
>> No, you'd see something. Perhaps our ACPI lid/power switch code is just
>> buggy then?
> 
> I already said this to Ian, but for the record... From my reading of the 
> ACPI spec (v 5.0, page 23 glossary entry) the SCI is an active low, 
> shareable, level-sensitive interrupt, but our code (pmtimer.c:pmt_update_sci) 
> seems to treat it as active high. I'll have a look at the QEMU SCI code as 
> reference, but maybe it is just broken.

While ACPI may prefer it to be that way, I don't think this is a
requirement (both physical systems I checked just now have it
level-high), and in any case subject to an interrupt source
override in MADT (which hvmloader doesn't produce afaict).

Jan


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