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Re: [Xen-devel] RE: [PATCH] remove _PS0 from the DSDTo

  • To: Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>, "Kay, Allen M" <allen.m.kay@xxxxxxxxx>
  • From: Keir Fraser <keir.xen@xxxxxxxxx>
  • Date: Mon, 28 Feb 2011 15:52:38 +0000
  • Cc: Ian Campbell <Ian.Campbell@xxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>, Jean Guyader <Jean.Guyader@xxxxxxxxxx>
  • Delivery-date: Mon, 28 Feb 2011 07:54:13 -0800
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  • Thread-topic: [Xen-devel] RE: [PATCH] remove _PS0 from the DSDTo

On 28/02/2011 15:33, "Stefano Stabellini" <stefano.stabellini@xxxxxxxxxxxxx>

> On Sat, 26 Feb 2011, Kay, Allen M wrote:
>> Hi Stefano,
>> I just tried this patch booting Win7-64bit in following two configurations:
>>     1) Passthrough two NIC devices - onboard + PCIe E1000
>>     2) Passthrough SNB IGD + USB + audio + NIC
>> In both cases, Windows failed to boot complaining about BIOS is not ACPI
>> compliant.
>> If I don't passthrough any devices, Windows can boot successfully.
> In that case we have a problem because I don't see any other way we
> could fix the issue in a way that is acceptable for xen 4.1.
> We could emulate PM capabilities in qemu even for devices that don't
> support it or make the presence of _PS0 conditional on the presence of
> PM capabilities on the devices. In both cases the fix will miss 4.1.

Stefano: Your patch should have deleted the _PS3 method along with _PS0. It
is an ACPI requirement that if you define an object to turn a device off
(i.e., _PS3 in this case) then you must also supply a symmetric object to
turn on the device (i.e., _PS0). So you must remove both, and there's no
reason not to since they both only contain debug stuff.

I suggest try again and see if _PS3 removal solves Allen's Windows boot

 -- Keir

> However there is a simple workaround for it: just disable acpi in the
> config file of the VM.

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