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Re: [Xen-devel] Re: [RFC PATCH] acpi/xen: Evaluate the _PDC properly (fo

To: Jan Beulich <JBeulich@xxxxxxxxxx>
Subject: Re: [Xen-devel] Re: [RFC PATCH] acpi/xen: Evaluate the _PDC properly (for 2.6.32, and 2.6.39)
From: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Date: Wed, 15 Jun 2011 11:00:38 -0400
Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, bderzhavets@xxxxxxxxx, ke.yu@xxxxxxxxx, carsten@xxxxxxxxxx, tom.goetz@xxxxxxxxxxxxxxxxxxx
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On Wed, Jun 15, 2011 at 03:15:59PM +0100, Jan Beulich wrote:
> >>> On 15.06.11 at 15:46, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> 
> >>> wrote:
> > I was trying to bring up an prototype box and it while it booted fine under
> > Linux, if I tried to do it under Dom0 with a modified Linux kernel it 
> > crashed.
> > By modified I mean it had the "xen/acpi: add xen acpi processor driver" 
> > patch in it.
> > 
> > I traced it down to a one line fix which fixed the issue.
> > It might make sense to back-port this to the 2.6.32 tree, and it _might_ fix
> The parameter type change happened in 2.6.33.

Aha! That would explain why it was there - thank you for your sharp eye.

BTW, are there any good materials on explaining _PSS, _PDC, _P.. and C-states
and how to read the ACPI DSDT/SSDT to figure out what it has?

One of my AMD boxes on baremetal finds the _PSS tables but when
I boot under Xen it tells me it can't find it - and I am not even sure what they
look like in the ACPI tables.

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