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

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.

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

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