RE: [Xen-devel] Re: [Xen-ia64-devel] [PATCH 0/3] IA64: add cpufreq support

["Yu, Ke" <ke.yu@xxxxxxxxx>]

Isaku Yamahata wrote:
> On Thu, Oct 09, 2008 at 11:37:23AM +0800, Yu, Ke wrote:
>> Oh, looks like the BIOS is broken. From the  _PSS object , only the
>> P0 state is valid, other two P states P1 and P2 are all zeros. This
>> is not correct.
>>
>> Can you try another machine?
>
> Not only DSDT, but also MADE was broken,
> I confirmed that xenpm worked by patching those tables. That's okay.
>
> Is it assumed that the dom0 acpi layer sees real
> tables so that it understands all physical cpus?
>
> The assumption isn't true on xen/ia64.
> Xen/ia64 modifies MADT to tell dom0 how many vcpu are assigned to
> dom0. Please see acpi_update_lsapic() in
> xen/arch/ia64/xen/dom_fw_dom0.c Something needs to be done.
>
> thanks,

Right, we already take this into consideration at the design phase. 
Fortunately, Only the DSDT is needed for Px state, which is unmodifed, so that 
is Ok for Px support.

And for the acpi id to apic id maping, we dedicatedly parse the MADT before the 
acpi_update_lsapic, so the maping is also correct.

Best Regards
Ke

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