From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: xen acpi cpufreq driver
Date: Thu, 26 Apr 2012 14:25:17 -0400
Message-ID: <20120426182517.GA24459@phenom.dumpdata.com>
References: <201204241904.03726.tobias.geiger@vido.info>
	<20120424173601.GA27353@phenom.dumpdata.com>
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To: Tobias Geiger <tobias.geiger@vido.info>
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On Wed, Apr 25, 2012 at 01:28:38AM +0200, Tobias Geiger wrote:
> Am 24.04.2012 19:36, schrieb Konrad Rzeszutek Wilk:
> >On Tue, Apr 24, 2012 at 07:04:03PM +0200, Tobias Geiger wrote:
> >>Hi,
> >>
> >>i'm not sure if i understood the new acpi xen cpufreq driver - here's the
> >>output when loading  xen_acpi_processor module in linux 3.4:
> >>
> >>dom0 dmesg:
> >>
> >>[   32.728151] xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU8
> >>[   32.728156] xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU9
> >>[   32.728160] xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU10
> >>[   32.728164] xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU11
> >>[   32.728168] xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU12
> >>[   32.728172] xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU13
> >>[   32.728176] xen-acpi-processor: (CX): Hypervisor error (-22) for ACPI CPU14

So your DSDT has:

   External (\_PR_.CPUF, DeviceObj)
    External (\_PR_.CPUE, DeviceObj)
    External (\_PR_.CPUD, DeviceObj)
    External (\_PR_.CPUC, DeviceObj)
    External (\_PR_.CPUB, DeviceObj)
    External (\_PR_.CPUA, DeviceObj)
    External (\_PR_.CPU9, DeviceObj)
    External (\_PR_.CPU8, DeviceObj)
    External (\_PR_.CPU7, DeviceObj)
    External (\_PR_.CPU6, DeviceObj)
    External (\_PR_.CPU5, DeviceObj)
    External (\_PR_.CPU4, DeviceObj)
    External (\_PR_.CPU3, DeviceObj)
    External (\_PR_.CPU2, DeviceObj)
    External (\_PR_.CPU1, DeviceObj)
    External (\_PR_.CPU0, DeviceObj)

And along with some other stuff in the DSDT it advertises that
it has 16 CPUs and it sets up even sixteen _CST and _PST data structures.

But you only have eight. This is really a BIOS bug.

However, let me fix it in the driver so that you don't get that error.
(I had a similar fix in the driver for dealing with the P-states
but didn't do it for the C-states).